1# <pre>
2# This file is in the public domain, so clarified as of
3# 2009-05-17 by Arthur David Olson.
4
5# also includes Central America and the Caribbean
6
7# This data is by no means authoritative; if you think you know better,
8# go ahead and edit the file (and please send any changes to
9# tz@iana.org for general use in the future).
10
11# From Paul Eggert (1999-03-22):
12# A reliable and entertaining source about time zones is
13# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14
15###############################################################################
16
17# United States
18
19# From Paul Eggert (1999-03-31):
20# Howse writes (pp 121-125) that time zones were invented by
21# Professor Charles Ferdinand Dowd (1825-1904),
22# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23# His pamphlet ``A System of National Time for Railroads'' (1870)
24# was the result of his proposals at the Convention of Railroad Trunk Lines
25# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26# but in 1872-05 he moved the proposed origin to Greenwich.
27# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
28# and the most of the country soon followed suit.
29
30# From Paul Eggert (2005-04-16):
31# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
32# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
33
34# From Paul Eggert (2006-03-22):
35# A good source for time zone historical data in the US is
36# Thomas G. Shanks, The American Atlas (5th edition),
37# San Diego: ACS Publications, Inc. (1991).
38# Make sure you have the errata sheet; the book is somewhat useless without it.
39# It is the source for most of the pre-1991 US entries below.
40
41# From Paul Eggert (2001-03-06):
42# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43# in his whimsical essay ``An Economical Project for Diminishing the Cost
44# of Light'' published in the Journal de Paris (1784-04-26).
45# Not everyone is happy with the results:
46#
47# I don't really care how time is reckoned so long as there is some
48# agreement about it, but I object to being told that I am saving
49# daylight when my reason tells me that I am doing nothing of the kind.
50# I even object to the implication that I am wasting something
51# valuable if I stay in bed after the sun has risen. As an admirer
52# of moonlight I resent the bossy insistence of those who want to
53# reduce my time for enjoying it. At the back of the Daylight Saving
54# scheme I detect the bony, blue-fingered hand of Puritanism, eager
55# to push people into bed earlier, and get them up earlier, to make
56# them healthy, wealthy and wise in spite of themselves.
57#
58# -- Robertson Davies, The diary of Samuel Marchbanks,
59# Clarke, Irwin (1947), XIX, Sunday
60#
61# For more about the first ten years of DST in the United States, see
62# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
63# Ten years of daylight saving from the Pittsburgh standpoint
64# (Carnegie Library of Pittsburgh, 1927)</a>.
65#
66# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
67# However, DST was imposed by the Standard Time Act of 1918, which
68# was the first nationwide legal time standard, and apparently
69# time was just called "Standard Time" or "Daylight Saving Time".
70
71# From Arthur David Olson:
72# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
73# See, for example, the front page of the Saturday, 1974-10-26
74# and Sunday, 1974-10-27 editions of the Washington Post.
75
76# From Arthur David Olson:
77# Before the Uniform Time Act of 1966 took effect in 1967, observance of
78# Daylight Saving Time in the US was by local option, except during wartime.
79
80# From Arthur David Olson (2000-09-25):
81# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
82# In the introduction, Oboler spoke of "Eastern Peace Time."
83# An AltaVista search turned up
84# <a href="http://rowayton.org/rhs/hstaug45.html">:
85# "When the time is announced over the radio now, it is 'Eastern Peace
86# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
87# </a> (August 1945) by way of confirmation.
88
89# From Joseph Gallant citing
90# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
91# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
92# to switch to London for Attlee's address, but the American people
93# never got to hear his speech live. According to one press account,
94# CBS' Bob Trout was first to announce the word of Japan's surrender,
95# but a few seconds later, NBC, ABC and Mutual also flashed the word
96# of surrender, all of whom interrupting the bells of Big Ben in
97# London which were to precede Mr. Attlee's speech.
98
99# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
100# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
101#
102# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
103# Any announcement from Asia would reach St. John's New York newsroom on a
104# wire service teletype machine, which had prescribed signals for major news.
105# Associated Press, for example, would ring five bells before spewing out
106# typed copy of an important story, and 10 bells for news "of transcendental
107# importance."
108#
109# On Aug. 14, stalling while talking steadily into the NBC networks' open
110# microphone, St. John heard five bells and waited only to hear a sixth bell,
111# before announcing confidently: "Ladies and gentlemen, World War II is over.
112# The Japanese have agreed to our surrender terms."
113#
114# He had scored a 20-second scoop on other broadcasters.
115
116# From Arthur David Olson (2005-08-22):
117# Paul has been careful to use the "US" rules only in those locations
118# that are part of the United States; this reflects the real scope of
119# U.S. government action. So even though the "US" rules have changed
120# in the latest release, other countries won't be affected.
121
122# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
123Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
124Rule US 1918 1919 - Oct lastSun 2:00 0 S
125Rule US 1942 only - Feb 9 2:00 1:00 W # War
126Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
127Rule US 1945 only - Sep 30 2:00 0 S
128Rule US 1967 2006 - Oct lastSun 2:00 0 S
129Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
130Rule US 1974 only - Jan 6 2:00 1:00 D
131Rule US 1975 only - Feb 23 2:00 1:00 D
132Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
133Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
134Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
135Rule US 2007 max - Nov Sun>=1 2:00 0 S
136
137# From Arthur David Olson, 2005-12-19
138# We generate the files specified below to guard against old files with
139# obsolete information being left in the time zone binary directory.
140# We limit the list to names that have appeared in previous versions of
141# this time zone package.
142# We do these as separate Zones rather than as Links to avoid problems if
143# a particular place changes whether it observes DST.
144# We put these specifications here in the northamerica file both to
145# increase the chances that they'll actually get compiled and to
146# avoid the need to duplicate the US rules in another file.
147
148# Zone NAME GMTOFF RULES FORMAT [UNTIL]
149Zone EST -5:00 - EST
150Zone MST -7:00 - MST
151Zone HST -10:00 - HST
152Zone EST5EDT -5:00 US E%sT
153Zone CST6CDT -6:00 US C%sT
154Zone MST7MDT -7:00 US M%sT
155Zone PST8PDT -8:00 US P%sT
156
157# From Bob Devine (1988-01-28):
158# ...Alaska (and Hawaii) had the timezone names changed in 1967.
159# old new
160# Pacific Standard Time(PST) -same-
161# Yukon Standard Time(YST) -same-
162# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
163# Nome Standard Time (NT) Bering Standard Time (BST)
164#
165# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
166# The YST zone now covers nearly all of the state, AHST just part
167# of the Aleutian islands. No DST.
168
169# From Paul Eggert (1995-12-19):
170# The tables below use `NST', not `NT', for Nome Standard Time.
171# I invented `CAWT' for Central Alaska War Time.
172
173# From U. S. Naval Observatory (1989-01-19):
174# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
175# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
176# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
177# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
178# USA MOUNTAIN 7 H BEHIND UTC DENVER
179# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
180# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
181# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
182# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
183# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
184# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
185# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
186# USA HAWAII 10 H BEHIND UTC
187# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
188
189# From Arthur David Olson (1989-01-21):
190# The above dates are for 1988.
191# Note the "AKST" and "AKDT" abbreviations, the claim that there's
192# no DST in Samoa, and the claim that there is DST in Alaska and the
193# Aleutians.
194
195# From Arthur David Olson (1988-02-13):
196# Legal standard time zone names, from United States Code (1982 Edition and
197# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
198# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
199# took effect), as explained in sections 263 and 261:
200# (none)
201# United States standard eastern time
202# United States standard mountain time
203# United States standard central time
204# United States standard Pacific time
205# (none)
206# United States standard Alaska time
207# (none)
208# Next, names from 1967-04-01 until 1983-11-30 (the date for
209# public law 98-181):
210# Atlantic standard time
211# eastern standard time
212# central standard time
213# mountain standard time
214# Pacific standard time
215# Yukon standard time
216# Alaska-Hawaii standard time
217# Bering standard time
218# And after 1983-11-30:
219# Atlantic standard time
220# eastern standard time
221# central standard time
222# mountain standard time
223# Pacific standard time
224# Alaska standard time
225# Hawaii-Aleutian standard time
226# Samoa standard time
227# The law doesn't give abbreviations.
228#
229# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
230# Public law 106-564 (2000-12-23) introduced the abbreviation
231# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
232# See the file "australasia".
233
234# From Arthur David Olson, 2005-08-09
235# The following was signed into law on 2005-08-08.
236#
237# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
238# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
239# U.S.C. 260a(a)) is amended--
240# (1) by striking `first Sunday of April' and inserting `second
241# Sunday of March'; and
242# (2) by striking `last Sunday of October' and inserting `first
243# Sunday of November'.
244# (b) Effective Date- Subsection (a) shall take effect 1 year after the
245# date of enactment of this Act or March 1, 2007, whichever is later.
246# (c) Report to Congress- Not later than 9 months after the effective
247# date stated in subsection (b), the Secretary shall report to Congress
248# on the impact of this section on energy consumption in the United
249# States.
250# (d) Right to Revert- Congress retains the right to revert the
251# Daylight Saving Time back to the 2005 time schedules once the
252# Department study is complete.
253
254# US eastern time, represented by New York
255
256# Connecticut, Delaware, District of Columbia, most of Florida,
257# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
258# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
259# New Hampshire, New Jersey, New York, North Carolina, Ohio,
260# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
261# Vermont, Virginia, West Virginia
262
263# From Dave Cantor (2004-11-02):
264# Early this summer I had the occasion to visit the Mount Washington
265# Observatory weather station atop (of course!) Mount Washington [, NH]....
266# One of the staff members said that the station was on Eastern Standard Time
267# and didn't change their clocks for Daylight Saving ... so that their
268# reports will always have times which are 5 hours behind UTC.
269
270# From Paul Eggert (2005-08-26):
271# According to today's Huntsville Times
272# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1>
273# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
274# in Russell County, Lanett in Chambers County and some towns in Lee County,
275# set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
276# Roberts, city administrator in Phenix City. as saying "We are in the Central
277# time zone, but we do go by the Eastern time zone because so many people work
278# in Columbus."
279
280# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
281Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
282Rule NYC 1920 only - Oct lastSun 2:00 0 S
283Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
284Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
285Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
286# Zone NAME GMTOFF RULES FORMAT [UNTIL]
287Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
288 -5:00 US E%sT 1920
289 -5:00 NYC E%sT 1942
290 -5:00 US E%sT 1946
291 -5:00 NYC E%sT 1967
292 -5:00 US E%sT
293
294# US central time, represented by Chicago
295
296# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
297# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
298# Washington counties), Illinois, western Indiana
299# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
300# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
301# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
302# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
303# western Tennessee, most of Texas, Wisconsin
304
305# From Larry M. Smith (2006-04-26) re Wisconsin:
306# http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
307# is currently enforced at the 01:00 time of change. Because the local
308# "bar time" in the state corresponds to 02:00, a number of citations
309# are issued for the "sale of class 'B' alcohol after prohibited
310# hours" within the deviated hour of this change every year....
311#
312# From Douglas R. Bomberg (2007-03-12):
313# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
314# Statue 175 closer in synch with the US Congress' intent....
315# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
316
317# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
318Rule Chicago 1920 only - Jun 13 2:00 1:00 D
319Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
320Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
321Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
322Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
323Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
324# Zone NAME GMTOFF RULES FORMAT [UNTIL]
325Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
326 -6:00 US C%sT 1920
327 -6:00 Chicago C%sT 1936 Mar 1 2:00
328 -5:00 - EST 1936 Nov 15 2:00
329 -6:00 Chicago C%sT 1942
330 -6:00 US C%sT 1946
331 -6:00 Chicago C%sT 1967
332 -6:00 US C%sT
333# Oliver County, ND switched from mountain to central time on 1992-10-25.
334Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
335 -7:00 US M%sT 1992 Oct 25 02:00
336 -6:00 US C%sT
337# Morton County, ND, switched from mountain to central time on
338# 2003-10-26, except for the area around Mandan which was already central time.
339# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
340# Officially this switch also included part of Sioux County, and
341# Jones, Mellette, and Todd Counties in South Dakota;
342# but in practice these other counties were already observing central time.
343# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
344Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
345 -7:00 US M%sT 2003 Oct 26 02:00
346 -6:00 US C%sT
347
348# From Josh Findley (2011-01-21):
349# ...it appears that Mercer County, North Dakota, changed from the
350# mountain time zone to the central time zone at the last transition from
351# daylight-saving to standard time (on Nov. 7, 2010):
352# <a href="http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm">
353# http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
354# </a>
355# <a href="http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html">
356# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
357# </a>
358
359# From Andy Lipscomb (2011-01-24):
360# ...according to the Census Bureau, the largest city is Beulah (although
361# it's commonly referred to as Beulah-Hazen, with Hazen being the next
362# largest city in Mercer County). Google Maps places Beulah's city hall
363# at 4715'51" north, 10146'40" west, which yields an offset of 6h47'07".
364
365Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
366 -7:00 US M%sT 2010 Nov 7 2:00
367 -6:00 US C%sT
368
369# US mountain time, represented by Denver
370#
371# Colorado, far western Kansas, Montana, western
372# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
373# New Mexico, southwestern North Dakota,
374# western South Dakota, far western Texas (El Paso County, Hudspeth County,
375# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
376#
377# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
378Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
379Rule Denver 1920 only - Oct lastSun 2:00 0 S
380Rule Denver 1921 only - May 22 2:00 0 S
381Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
382Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
383# Zone NAME GMTOFF RULES FORMAT [UNTIL]
384Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
385 -7:00 US M%sT 1920
386 -7:00 Denver M%sT 1942
387 -7:00 US M%sT 1946
388 -7:00 Denver M%sT 1967
389 -7:00 US M%sT
390
391# US Pacific time, represented by Los Angeles
392#
393# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
394# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
395# and the northern three-quarters of Idaho county),
396# most of Nevada, most of Oregon, and Washington
397#
398# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
399Rule CA 1948 only - Mar 14 2:00 1:00 D
400Rule CA 1949 only - Jan 1 2:00 0 S
401Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
402Rule CA 1950 1961 - Sep lastSun 2:00 0 S
403Rule CA 1962 1966 - Oct lastSun 2:00 0 S
404# Zone NAME GMTOFF RULES FORMAT [UNTIL]
405Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
406 -8:00 US P%sT 1946
407 -8:00 CA P%sT 1967
408 -8:00 US P%sT
409
410# Alaska
411# AK%sT is the modern abbreviation for -9:00 per USNO.
412#
413# From Paul Eggert (2001-05-30):
414# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
415# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
416# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
417# also a Friday. Include only the time zone part of this transition,
418# ignoring the switch from Julian to Gregorian, since we can't represent
419# the Julian calendar.
420#
421# As far as we know, none of the exact locations mentioned below were
422# permanently inhabited in 1867 by anyone using either calendar.
423# (Yakutat was colonized by the Russians in 1799, but the settlement
424# was destroyed in 1805 by a Yakutat-kon war party.) However, there
425# were nearby inhabitants in some cases and for our purposes perhaps
426# it's best to simply use the official transition.
427#
428
429# From Steve Ferguson (2011-01-31):
430# The author lives in Alaska and many of the references listed are only
431# available to Alaskan residents.
432#
433# <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98">
434# http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98
435# </a>
436
437# From Arthur David Olson (2011-02-01):
438# Here's database-relevant material from the 2001 "Alaska History" article:
439#
440# On September 20 [1979]...DOT...officials decreed that on April 27,
441# 1980, Juneau and other nearby communities would move to Yukon Time.
442# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
443# Pacific Time.
444#
445# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
446# Department's September 1979 decision. Juneau and other communities in
447# northern Southeast reverted to Pacific Time on October 26.
448#
449# On October 28 [1983]...the Metlakatla Indian Community Council voted
450# unanimously to keep the reservation on Pacific Time.
451#
452# According to DOT official Joanne Petrie, Indian reservations are not
453# bound to follow time zones imposed by neighboring jurisdictions.
454#
455# (The last is consistent with how the database now handles the Navajo
456# Nation.)
457
458# From Arthur David Olson (2011-02-09):
459# I just spoke by phone with a staff member at the Metlakatla Indian
460# Community office (using contact information available at
461# <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla">
462# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
463# </a>).
464# It's shortly after 1:00 here on the east coast of the United States;
465# the staffer said it was shortly after 10:00 there. When I asked whether
466# that meant they were on Pacific time, they said no--they were on their
467# own time. I asked about daylight saving; they said it wasn't used. I
468# did not inquire about practices in the past.
469
470# From Arthur David Olson (2011-08-17):
471# For lack of better information, assume that Metlakatla's
472# abandonment of use of daylight saving resulted from the 1983 vote.
473
474# Zone NAME GMTOFF RULES FORMAT [UNTIL]
475Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
476 -8:57:41 - LMT 1900 Aug 20 12:00
477 -8:00 - PST 1942
478 -8:00 US P%sT 1946
479 -8:00 - PST 1969
480 -8:00 US P%sT 1980 Apr 27 2:00
481 -9:00 US Y%sT 1980 Oct 26 2:00
482 -8:00 US P%sT 1983 Oct 30 2:00
483 -9:00 US Y%sT 1983 Nov 30
484 -9:00 US AK%sT
485Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
486 -9:01:13 - LMT 1900 Aug 20 12:00
487 -8:00 - PST 1942
488 -8:00 US P%sT 1946
489 -8:00 - PST 1969
490 -8:00 US P%sT 1983 Oct 30 2:00
491 -9:00 US Y%sT 1983 Nov 30
492 -9:00 US AK%sT
493Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
494 -8:46:18 - LMT 1900 Aug 20 12:00
495 -8:00 - PST 1942
496 -8:00 US P%sT 1946
497 -8:00 - PST 1969
498 -8:00 US P%sT 1983 Oct 30 2:00
499 -8:00 - MeST
500Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
501 -9:18:55 - LMT 1900 Aug 20 12:00
502 -9:00 - YST 1942
503 -9:00 US Y%sT 1946
504 -9:00 - YST 1969
505 -9:00 US Y%sT 1983 Nov 30
506 -9:00 US AK%sT
507Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
508 -9:59:36 - LMT 1900 Aug 20 12:00
509 -10:00 - CAT 1942
510 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
511 -10:00 US CAT/CAPT 1946 # Peace
512 -10:00 - CAT 1967 Apr
513 -10:00 - AHST 1969
514 -10:00 US AH%sT 1983 Oct 30 2:00
515 -9:00 US Y%sT 1983 Nov 30
516 -9:00 US AK%sT
517Zone America/Nome 12:58:21 - LMT 1867 Oct 18
518 -11:01:38 - LMT 1900 Aug 20 12:00
519 -11:00 - NST 1942
520 -11:00 US N%sT 1946
521 -11:00 - NST 1967 Apr
522 -11:00 - BST 1969
523 -11:00 US B%sT 1983 Oct 30 2:00
524 -9:00 US Y%sT 1983 Nov 30
525 -9:00 US AK%sT
526Zone America/Adak 12:13:21 - LMT 1867 Oct 18
527 -11:46:38 - LMT 1900 Aug 20 12:00
528 -11:00 - NST 1942
529 -11:00 US N%sT 1946
530 -11:00 - NST 1967 Apr
531 -11:00 - BST 1969
532 -11:00 US B%sT 1983 Oct 30 2:00
533 -10:00 US AH%sT 1983 Nov 30
534 -10:00 US HA%sT
535# The following switches don't quite make our 1970 cutoff.
536#
537# Shanks writes that part of southwest Alaska (e.g. Aniak)
538# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
539# and another part (e.g. Akiak) made the same switch five weeks later.
540#
541# From David Flater (2004-11-09):
542# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
543# Historic Preservation Commission, provided this information, which
544# suggests that Unalaska deviated from statutory time from early 1967
545# possibly until 1983:
546#
547# Minutes of the Unalaska City Council Meeting, January 10, 1967:
548# "Except for St. Paul and Akutan, Unalaska is the only important
549# location not on Alaska Standard Time. The following resolution was
550# made by William Robinson and seconded by Henry Swanson: Be it
551# resolved that the City of Unalaska hereby goes to Alaska Standard
552# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
553# January 14, Alaska Standard Time.) This resolution was passed with
554# three votes for and one against."
555
556# Hawaii
557
558# From Arthur David Olson (2010-12-09):
559# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
560# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
561# the article is available at
562# <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
563# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
564# </a>
565# and indicates that standard time was adopted effective noon, January
566# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
567# saving for the period between the last Sunday of each April and the
568# last Sunday of each September, but less than a month later repealed the
569# act," (page 220), that year-round daylight saving time was in effect
570# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
571# when clocks changed) and that clocks were changed by 30 minutes
572# effective the second Sunday of June, 1947 (page 219, with no time of
573# day given for when clocks changed). A footnote for the 1933 changes
574# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
575# and Act 163 (approved 21 May 1933)."
576
577# From Arthur David Olson (2011-01-19):
578# The following is from "Laws of the Territory of Hawaii Passed by the
579# Seventeenth Legislature: Regular Session 1933," available (as of
580# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
581# 90...At 2 o'clock ante meridian of the last Sunday in April of each
582# year, the standard time of this Territory shall be advanced one
583# hour...This Act shall take effect upon its approval. Approved this 26th
584# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
585# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
586# hereby repealed...This Act shall take effect upon its approval, upon
587# which date the standard time of this Territory shall be restored to
588# that existing immediately prior to the taking effect of said Act 90.
589# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
590# of the Territory of Hawaii."
591#
592# Note that 1933-05-21 was a Sunday.
593# We're left to guess the time of day when Act 163 was approved; guess noon.
594
595Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
596 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
597 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
598 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
599 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
600 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
601 -10:00 - HST
602
603# Now we turn to US areas that have diverged from the consensus since 1970.
604
605# Arizona mostly uses MST.
606
607# From Paul Eggert (2002-10-20):
608#
609# The information in the rest of this paragraph is derived from the
610# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
611# Daylight Saving Time web page (2002-01-23)</a> maintained by the
612# Arizona State Library, Archives and Public Records.
613# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
614# time, but by federal law railroads, airlines, bus lines, military
615# personnel, and some engaged in interstate commerce continued to
616# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
617# Gazette says that was the date the law changed, and that 04-01 was
618# the date the state's clocks would change. In 1945 the State of
619# Arizona used standard time all year, again with exceptions only as
620# mandated by federal law. Arizona observed DST in 1967, but Arizona
621# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
622#
623# Shanks says the 1944 experiment came to an end on 1944-03-17.
624# Go with the Arizona State Library instead.
625
626Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
627 -7:00 US M%sT 1944 Jan 1 00:01
628 -7:00 - MST 1944 Apr 1 00:01
629 -7:00 US M%sT 1944 Oct 1 00:01
630 -7:00 - MST 1967
631 -7:00 US M%sT 1968 Mar 21
632 -7:00 - MST
633# From Arthur David Olson (1988-02-13):
634# A writer from the Inter Tribal Council of Arizona, Inc.,
635# notes in private correspondence dated 1987-12-28 that "Presently, only the
636# Navajo Nation participates in the Daylight Saving Time policy, due to its
637# large size and location in three states." (The "only" means that other
638# tribal nations don't use DST.)
639
640Link America/Denver America/Shiprock
641
642# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
643# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
644# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
645# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
646# Teton, Twin Falls, Valley, Washington counties, and the southern
647# quarter of Idaho county) and eastern Oregon (most of Malheur County)
648# switched four weeks late in 1974.
649#
650# Zone NAME GMTOFF RULES FORMAT [UNTIL]
651Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
652 -8:00 US P%sT 1923 May 13 2:00
653 -7:00 US M%sT 1974
654 -7:00 - MST 1974 Feb 3 2:00
655 -7:00 US M%sT
656
657# Indiana
658#
659# For a map of Indiana's time zone regions, see:
660# <a href="http://www.mccsc.edu/time.html">
661# What time is it in Indiana?
662# </a> (2006-03-01)
663#
664# From Paul Eggert (2007-08-17):
665# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
666# with the following exceptions:
667#
668# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
669# Vandenburgh, and Warrick counties have been like America/Chicago.
670#
671# - Dearborn and Ohio counties have been like America/New_York.
672#
673# - Clark, Floyd, and Harrison counties have been like
674# America/Kentucky/Louisville.
675#
676# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
677# and Switzerland counties have their own time zone histories as noted below.
678#
679# Shanks partitioned Indiana into 345 regions, each with its own time history,
680# and wrote ``Even newspaper reports present contradictory information.''
681# Those Hoosiers! Such a flighty and changeable people!
682# Fortunately, most of the complexity occurred before our cutoff date of 1970.
683#
684# Other than Indianapolis, the Indiana place names are so nondescript
685# that they would be ambiguous if we left them at the `America' level.
686# So we reluctantly put them all in a subdirectory `America/Indiana'.
687
688# From Paul Eggert (2005-08-16):
689# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
690
691# From Nathan Stratton Treadway (2006-03-30):
692# http://www.dot.gov/affairs/dot0406.htm [3705 B]
693# From Deborah Goldsmith (2006-01-18):
694# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
695# From Paul Eggert (2006-01-20):
696# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
697# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
698# Eastern Time Zone to the Central Time Zone.... The effective date of
699# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
700# changeover date from standard time to Daylight Saving Time."
701# Strictly speaking, this means the affected counties will change their
702# clocks twice that night, but this obviously is in error. The intent
703# is that 01:59:59 EST be followed by 02:00:00 CDT.
704
705# From Gwillim Law (2007-02-10):
706# The Associated Press has been reporting that Pulaski County, Indiana is
707# going to switch from Central to Eastern Time on March 11, 2007....
708# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
709
710# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
711Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
712Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
713Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
714# Zone NAME GMTOFF RULES FORMAT [UNTIL]
715Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
716 -6:00 US C%sT 1920
717 -6:00 Indianapolis C%sT 1942
718 -6:00 US C%sT 1946
719 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
720 -5:00 - EST 1957 Sep 29 2:00
721 -6:00 - CST 1958 Apr 27 2:00
722 -5:00 - EST 1969
723 -5:00 US E%sT 1971
724 -5:00 - EST 2006
725 -5:00 US E%sT
726#
727# Eastern Crawford County, Indiana, left its clocks alone in 1974,
728# as well as from 1976 through 2005.
729# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
730Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
731Rule Marengo 1951 only - Sep lastSun 2:00 0 S
732Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
733Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
734# Zone NAME GMTOFF RULES FORMAT [UNTIL]
735Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
736 -6:00 US C%sT 1951
737 -6:00 Marengo C%sT 1961 Apr 30 2:00
738 -5:00 - EST 1969
739 -5:00 US E%sT 1974 Jan 6 2:00
740 -6:00 1:00 CDT 1974 Oct 27 2:00
741 -5:00 US E%sT 1976
742 -5:00 - EST 2006
743 -5:00 US E%sT
744#
745# Daviess, Dubois, Knox, and Martin Counties, Indiana,
746# switched from eastern to central time in April 2006, then switched back
747# in November 2007.
748# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
749Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
750Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
751Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
752Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
753Rule Vincennes 1955 only - May 1 0:00 1:00 D
754Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
755Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
756Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
757Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
758# Zone NAME GMTOFF RULES FORMAT [UNTIL]
759Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
760 -6:00 US C%sT 1946
761 -6:00 Vincennes C%sT 1964 Apr 26 2:00
762 -5:00 - EST 1969
763 -5:00 US E%sT 1971
764 -5:00 - EST 2006 Apr 2 2:00
765 -6:00 US C%sT 2007 Nov 4 2:00
766 -5:00 US E%sT
767#
768# Perry County, Indiana, switched from eastern to central time in April 2006.
769# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
770Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
771Rule Perry 1946 only - Sep lastSun 2:00 0 S
772Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
773Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
774Rule Perry 1955 only - May 1 0:00 1:00 D
775Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
776Rule Perry 1960 only - Oct lastSun 2:00 0 S
777Rule Perry 1961 only - Sep lastSun 2:00 0 S
778Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
779# Zone NAME GMTOFF RULES FORMAT [UNTIL]
780Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
781 -6:00 US C%sT 1946
782 -6:00 Perry C%sT 1964 Apr 26 2:00
783 -5:00 - EST 1969
784 -5:00 US E%sT 1971
785 -5:00 - EST 2006 Apr 2 2:00
786 -6:00 US C%sT
787#
788# Pike County, Indiana moved from central to eastern time in 1977,
789# then switched back in 2006, then switched back again in 2007.
790# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
791Rule Pike 1955 only - May 1 0:00 1:00 D
792Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
793Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
794Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
795# Zone NAME GMTOFF RULES FORMAT [UNTIL]
796Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
797 -6:00 US C%sT 1955
798 -6:00 Pike C%sT 1965 Apr 25 2:00
799 -5:00 - EST 1966 Oct 30 2:00
800 -6:00 US C%sT 1977 Oct 30 2:00
801 -5:00 - EST 2006 Apr 2 2:00
802 -6:00 US C%sT 2007 Nov 4 2:00
803 -5:00 US E%sT
804#
805# Starke County, Indiana moved from central to eastern time in 1991,
806# then switched back in 2006.
807# From Arthur David Olson (1991-10-28):
808# An article on page A3 of the Sunday, 1991-10-27 Washington Post
809# notes that Starke County switched from Central time to Eastern time as of
810# 1991-10-27.
811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
812Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
813Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
814Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
815Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
816Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
817# Zone NAME GMTOFF RULES FORMAT [UNTIL]
818Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
819 -6:00 US C%sT 1947
820 -6:00 Starke C%sT 1962 Apr 29 2:00
821 -5:00 - EST 1963 Oct 27 2:00
822 -6:00 US C%sT 1991 Oct 27 2:00
823 -5:00 - EST 2006 Apr 2 2:00
824 -6:00 US C%sT
825#
826# Pulaski County, Indiana, switched from eastern to central time in
827# April 2006 and then switched back in March 2007.
828# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
829Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
830Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
831Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
832Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
833# Zone NAME GMTOFF RULES FORMAT [UNTIL]
834Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
835 -6:00 US C%sT 1946
836 -6:00 Pulaski C%sT 1961 Apr 30 2:00
837 -5:00 - EST 1969
838 -5:00 US E%sT 1971
839 -5:00 - EST 2006 Apr 2 2:00
840 -6:00 US C%sT 2007 Mar 11 2:00
841 -5:00 US E%sT
842#
843# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
844# Zone NAME GMTOFF RULES FORMAT [UNTIL]
845Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
846 -6:00 US C%sT 1954 Apr 25 2:00
847 -5:00 - EST 1969
848 -5:00 US E%sT 1973
849 -5:00 - EST 2006
850 -5:00 US E%sT
851
852# Part of Kentucky left its clocks alone in 1974.
853# This also includes Clark, Floyd, and Harrison counties in Indiana.
854# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
855Rule Louisville 1921 only - May 1 2:00 1:00 D
856Rule Louisville 1921 only - Sep 1 2:00 0 S
857Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
858Rule Louisville 1941 only - Sep lastSun 2:00 0 S
859Rule Louisville 1946 only - Jun 2 2:00 0 S
860Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
861Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
862# Zone NAME GMTOFF RULES FORMAT [UNTIL]
863Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
864 -6:00 US C%sT 1921
865 -6:00 Louisville C%sT 1942
866 -6:00 US C%sT 1946
867 -6:00 Louisville C%sT 1961 Jul 23 2:00
868 -5:00 - EST 1968
869 -5:00 US E%sT 1974 Jan 6 2:00
870 -6:00 1:00 CDT 1974 Oct 27 2:00
871 -5:00 US E%sT
872#
873# Wayne County, Kentucky
874#
875# From
876# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
877# Lake Cumberland LIFE
878# </a> (1999-01-29) via WKYM-101.7:
879# Clinton County has joined Wayne County in asking the DoT to change from
880# the Central to the Eastern time zone.... The Wayne County government made
881# the same request in December. And while Russell County officials have not
882# taken action, the majority of respondents to a poll conducted there in
883# August indicated they would like to change to "fast time" also.
884# The three Lake Cumberland counties are the farthest east of any U.S.
885# location in the Central time zone.
886#
887# From Rich Wales (2000-08-29):
888# After prolonged debate, and despite continuing deep differences of opinion,
889# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
890# (-0500) time. They won't "fall back" this year. See Sara Shipley,
891# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
892#
893# From Paul Eggert (2001-07-16):
894# The final rule was published in the
895# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
896# Federal Register 65, 160 (2000-08-17), page 50154-50158.
897# </a>
898#
899Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
900 -6:00 US C%sT 1946
901 -6:00 - CST 1968
902 -6:00 US C%sT 2000 Oct 29 2:00
903 -5:00 US E%sT
904
905
906# From Rives McDow (2000-08-30):
907# Here ... are all the changes in the US since 1985.
908# Kearny County, KS (put all of county on central;
909# previously split between MST and CST) ... 1990-10
910# Starke County, IN (from CST to EST) ... 1991-10
911# Oliver County, ND (from MST to CST) ... 1992-10
912# West Wendover, NV (from PST TO MST) ... 1999-10
913# Wayne County, KY (from CST to EST) ... 2000-10
914#
915# From Paul Eggert (2001-07-17):
916# We don't know where the line used to be within Kearny County, KS,
917# so omit that change for now.
918# See America/Indiana/Knox for the Starke County, IN change.
919# See America/North_Dakota/Center for the Oliver County, ND change.
920# West Wendover, NV officially switched from Pacific to mountain time on
921# 1999-10-31. See the
922# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
923# Federal Register 64, 203 (1999-10-21), page 56705-56707.
924# </a>
925# However, the Federal Register says that West Wendover already operated
926# on mountain time, and the rule merely made this official;
927# hence a separate tz entry is not needed.
928
929# Michigan
930#
931# From Bob Devine (1988-01-28):
932# Michigan didn't observe DST from 1968 to 1973.
933#
934# From Paul Eggert (1999-03-31):
935# Shanks writes that Michigan started using standard time on 1885-09-18,
936# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
937# that Detroit kept
938#
939# local time until 1900 when the City Council decreed that clocks should
940# be put back twenty-eight minutes to Central Standard Time. Half the
941# city obeyed, half refused. After considerable debate, the decision
942# was rescinded and the city reverted to Sun time. A derisive offer to
943# erect a sundial in front of the city hall was referred to the
944# Committee on Sewers. Then, in 1905, Central time was adopted
945# by city vote.
946#
947# This story is too entertaining to be false, so go with Howse over Shanks.
948#
949# From Paul Eggert (2001-03-06):
950# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
951# one hour in 1914.'' This change is not in Shanks. We have no more
952# info, so omit this for now.
953#
954# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
955# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
956Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
957Rule Detroit 1948 only - Sep lastSun 2:00 0 S
958Rule Detroit 1967 only - Jun 14 2:00 1:00 D
959Rule Detroit 1967 only - Oct lastSun 2:00 0 S
960# Zone NAME GMTOFF RULES FORMAT [UNTIL]
961Zone America/Detroit -5:32:11 - LMT 1905
962 -6:00 - CST 1915 May 15 2:00
963 -5:00 - EST 1942
964 -5:00 US E%sT 1946
965 -5:00 Detroit E%sT 1973
966 -5:00 US E%sT 1975
967 -5:00 - EST 1975 Apr 27 2:00
968 -5:00 US E%sT
969#
970# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
971# switched from EST to CST/CDT in 1973.
972# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
973Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
974Rule Menominee 1946 only - Sep lastSun 2:00 0 S
975Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
976Rule Menominee 1966 only - Oct lastSun 2:00 0 S
977# Zone NAME GMTOFF RULES FORMAT [UNTIL]
978Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
979 -6:00 US C%sT 1946
980 -6:00 Menominee C%sT 1969 Apr 27 2:00
981 -5:00 - EST 1973 Apr 29 2:00
982 -6:00 US C%sT
983
984# Navassa
985# administered by the US Fish and Wildlife Service
986# claimed by US under the provisions of the 1856 Guano Islands Act
987# also claimed by Haiti
988# occupied 1857/1900 by the Navassa Phosphate Co
989# US lighthouse 1917/1996-09
990# currently uninhabited
991# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
992# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
993# Jimmy Skaggs, _The Great Guano Rush_ (1994).
994
995################################################################################
996
997
998# From Paul Eggert (2006-03-22):
999# A good source for time zone historical data outside the U.S. is
1000# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1001# San Diego: ACS Publications, Inc. (2003).
1002#
1003# Gwillim Law writes that a good source
1004# for recent time zone data is the International Air Transport
1005# Association's Standard Schedules Information Manual (IATA SSIM),
1006# published semiannually. Law sent in several helpful summaries
1007# of the IATA's data after 1990.
1008#
1009# Except where otherwise noted, Shanks & Pottenger is the source for
1010# entries through 1990, and IATA SSIM is the source for entries afterwards.
1011#
1012# Other sources occasionally used include:
1013#
1014# Edward W. Whitman, World Time Differences,
1015# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1016# which I found in the UCLA library.
1017#
1018# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1019# William Willett, The Waste of Daylight, 19th edition
1020# </a> (1914-03)
1021#
| 1# <pre>
2# This file is in the public domain, so clarified as of
3# 2009-05-17 by Arthur David Olson.
4
5# also includes Central America and the Caribbean
6
7# This data is by no means authoritative; if you think you know better,
8# go ahead and edit the file (and please send any changes to
9# tz@iana.org for general use in the future).
10
11# From Paul Eggert (1999-03-22):
12# A reliable and entertaining source about time zones is
13# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14
15###############################################################################
16
17# United States
18
19# From Paul Eggert (1999-03-31):
20# Howse writes (pp 121-125) that time zones were invented by
21# Professor Charles Ferdinand Dowd (1825-1904),
22# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23# His pamphlet ``A System of National Time for Railroads'' (1870)
24# was the result of his proposals at the Convention of Railroad Trunk Lines
25# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26# but in 1872-05 he moved the proposed origin to Greenwich.
27# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
28# and the most of the country soon followed suit.
29
30# From Paul Eggert (2005-04-16):
31# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
32# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
33
34# From Paul Eggert (2006-03-22):
35# A good source for time zone historical data in the US is
36# Thomas G. Shanks, The American Atlas (5th edition),
37# San Diego: ACS Publications, Inc. (1991).
38# Make sure you have the errata sheet; the book is somewhat useless without it.
39# It is the source for most of the pre-1991 US entries below.
40
41# From Paul Eggert (2001-03-06):
42# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43# in his whimsical essay ``An Economical Project for Diminishing the Cost
44# of Light'' published in the Journal de Paris (1784-04-26).
45# Not everyone is happy with the results:
46#
47# I don't really care how time is reckoned so long as there is some
48# agreement about it, but I object to being told that I am saving
49# daylight when my reason tells me that I am doing nothing of the kind.
50# I even object to the implication that I am wasting something
51# valuable if I stay in bed after the sun has risen. As an admirer
52# of moonlight I resent the bossy insistence of those who want to
53# reduce my time for enjoying it. At the back of the Daylight Saving
54# scheme I detect the bony, blue-fingered hand of Puritanism, eager
55# to push people into bed earlier, and get them up earlier, to make
56# them healthy, wealthy and wise in spite of themselves.
57#
58# -- Robertson Davies, The diary of Samuel Marchbanks,
59# Clarke, Irwin (1947), XIX, Sunday
60#
61# For more about the first ten years of DST in the United States, see
62# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
63# Ten years of daylight saving from the Pittsburgh standpoint
64# (Carnegie Library of Pittsburgh, 1927)</a>.
65#
66# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
67# However, DST was imposed by the Standard Time Act of 1918, which
68# was the first nationwide legal time standard, and apparently
69# time was just called "Standard Time" or "Daylight Saving Time".
70
71# From Arthur David Olson:
72# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
73# See, for example, the front page of the Saturday, 1974-10-26
74# and Sunday, 1974-10-27 editions of the Washington Post.
75
76# From Arthur David Olson:
77# Before the Uniform Time Act of 1966 took effect in 1967, observance of
78# Daylight Saving Time in the US was by local option, except during wartime.
79
80# From Arthur David Olson (2000-09-25):
81# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
82# In the introduction, Oboler spoke of "Eastern Peace Time."
83# An AltaVista search turned up
84# <a href="http://rowayton.org/rhs/hstaug45.html">:
85# "When the time is announced over the radio now, it is 'Eastern Peace
86# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
87# </a> (August 1945) by way of confirmation.
88
89# From Joseph Gallant citing
90# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
91# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
92# to switch to London for Attlee's address, but the American people
93# never got to hear his speech live. According to one press account,
94# CBS' Bob Trout was first to announce the word of Japan's surrender,
95# but a few seconds later, NBC, ABC and Mutual also flashed the word
96# of surrender, all of whom interrupting the bells of Big Ben in
97# London which were to precede Mr. Attlee's speech.
98
99# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
100# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
101#
102# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
103# Any announcement from Asia would reach St. John's New York newsroom on a
104# wire service teletype machine, which had prescribed signals for major news.
105# Associated Press, for example, would ring five bells before spewing out
106# typed copy of an important story, and 10 bells for news "of transcendental
107# importance."
108#
109# On Aug. 14, stalling while talking steadily into the NBC networks' open
110# microphone, St. John heard five bells and waited only to hear a sixth bell,
111# before announcing confidently: "Ladies and gentlemen, World War II is over.
112# The Japanese have agreed to our surrender terms."
113#
114# He had scored a 20-second scoop on other broadcasters.
115
116# From Arthur David Olson (2005-08-22):
117# Paul has been careful to use the "US" rules only in those locations
118# that are part of the United States; this reflects the real scope of
119# U.S. government action. So even though the "US" rules have changed
120# in the latest release, other countries won't be affected.
121
122# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
123Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
124Rule US 1918 1919 - Oct lastSun 2:00 0 S
125Rule US 1942 only - Feb 9 2:00 1:00 W # War
126Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
127Rule US 1945 only - Sep 30 2:00 0 S
128Rule US 1967 2006 - Oct lastSun 2:00 0 S
129Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
130Rule US 1974 only - Jan 6 2:00 1:00 D
131Rule US 1975 only - Feb 23 2:00 1:00 D
132Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
133Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
134Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
135Rule US 2007 max - Nov Sun>=1 2:00 0 S
136
137# From Arthur David Olson, 2005-12-19
138# We generate the files specified below to guard against old files with
139# obsolete information being left in the time zone binary directory.
140# We limit the list to names that have appeared in previous versions of
141# this time zone package.
142# We do these as separate Zones rather than as Links to avoid problems if
143# a particular place changes whether it observes DST.
144# We put these specifications here in the northamerica file both to
145# increase the chances that they'll actually get compiled and to
146# avoid the need to duplicate the US rules in another file.
147
148# Zone NAME GMTOFF RULES FORMAT [UNTIL]
149Zone EST -5:00 - EST
150Zone MST -7:00 - MST
151Zone HST -10:00 - HST
152Zone EST5EDT -5:00 US E%sT
153Zone CST6CDT -6:00 US C%sT
154Zone MST7MDT -7:00 US M%sT
155Zone PST8PDT -8:00 US P%sT
156
157# From Bob Devine (1988-01-28):
158# ...Alaska (and Hawaii) had the timezone names changed in 1967.
159# old new
160# Pacific Standard Time(PST) -same-
161# Yukon Standard Time(YST) -same-
162# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
163# Nome Standard Time (NT) Bering Standard Time (BST)
164#
165# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
166# The YST zone now covers nearly all of the state, AHST just part
167# of the Aleutian islands. No DST.
168
169# From Paul Eggert (1995-12-19):
170# The tables below use `NST', not `NT', for Nome Standard Time.
171# I invented `CAWT' for Central Alaska War Time.
172
173# From U. S. Naval Observatory (1989-01-19):
174# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
175# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
176# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
177# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
178# USA MOUNTAIN 7 H BEHIND UTC DENVER
179# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
180# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
181# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
182# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
183# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
184# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
185# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
186# USA HAWAII 10 H BEHIND UTC
187# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
188
189# From Arthur David Olson (1989-01-21):
190# The above dates are for 1988.
191# Note the "AKST" and "AKDT" abbreviations, the claim that there's
192# no DST in Samoa, and the claim that there is DST in Alaska and the
193# Aleutians.
194
195# From Arthur David Olson (1988-02-13):
196# Legal standard time zone names, from United States Code (1982 Edition and
197# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
198# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
199# took effect), as explained in sections 263 and 261:
200# (none)
201# United States standard eastern time
202# United States standard mountain time
203# United States standard central time
204# United States standard Pacific time
205# (none)
206# United States standard Alaska time
207# (none)
208# Next, names from 1967-04-01 until 1983-11-30 (the date for
209# public law 98-181):
210# Atlantic standard time
211# eastern standard time
212# central standard time
213# mountain standard time
214# Pacific standard time
215# Yukon standard time
216# Alaska-Hawaii standard time
217# Bering standard time
218# And after 1983-11-30:
219# Atlantic standard time
220# eastern standard time
221# central standard time
222# mountain standard time
223# Pacific standard time
224# Alaska standard time
225# Hawaii-Aleutian standard time
226# Samoa standard time
227# The law doesn't give abbreviations.
228#
229# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
230# Public law 106-564 (2000-12-23) introduced the abbreviation
231# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
232# See the file "australasia".
233
234# From Arthur David Olson, 2005-08-09
235# The following was signed into law on 2005-08-08.
236#
237# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
238# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
239# U.S.C. 260a(a)) is amended--
240# (1) by striking `first Sunday of April' and inserting `second
241# Sunday of March'; and
242# (2) by striking `last Sunday of October' and inserting `first
243# Sunday of November'.
244# (b) Effective Date- Subsection (a) shall take effect 1 year after the
245# date of enactment of this Act or March 1, 2007, whichever is later.
246# (c) Report to Congress- Not later than 9 months after the effective
247# date stated in subsection (b), the Secretary shall report to Congress
248# on the impact of this section on energy consumption in the United
249# States.
250# (d) Right to Revert- Congress retains the right to revert the
251# Daylight Saving Time back to the 2005 time schedules once the
252# Department study is complete.
253
254# US eastern time, represented by New York
255
256# Connecticut, Delaware, District of Columbia, most of Florida,
257# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
258# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
259# New Hampshire, New Jersey, New York, North Carolina, Ohio,
260# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
261# Vermont, Virginia, West Virginia
262
263# From Dave Cantor (2004-11-02):
264# Early this summer I had the occasion to visit the Mount Washington
265# Observatory weather station atop (of course!) Mount Washington [, NH]....
266# One of the staff members said that the station was on Eastern Standard Time
267# and didn't change their clocks for Daylight Saving ... so that their
268# reports will always have times which are 5 hours behind UTC.
269
270# From Paul Eggert (2005-08-26):
271# According to today's Huntsville Times
272# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1>
273# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
274# in Russell County, Lanett in Chambers County and some towns in Lee County,
275# set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
276# Roberts, city administrator in Phenix City. as saying "We are in the Central
277# time zone, but we do go by the Eastern time zone because so many people work
278# in Columbus."
279
280# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
281Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
282Rule NYC 1920 only - Oct lastSun 2:00 0 S
283Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
284Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
285Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
286# Zone NAME GMTOFF RULES FORMAT [UNTIL]
287Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
288 -5:00 US E%sT 1920
289 -5:00 NYC E%sT 1942
290 -5:00 US E%sT 1946
291 -5:00 NYC E%sT 1967
292 -5:00 US E%sT
293
294# US central time, represented by Chicago
295
296# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
297# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
298# Washington counties), Illinois, western Indiana
299# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
300# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
301# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
302# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
303# western Tennessee, most of Texas, Wisconsin
304
305# From Larry M. Smith (2006-04-26) re Wisconsin:
306# http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
307# is currently enforced at the 01:00 time of change. Because the local
308# "bar time" in the state corresponds to 02:00, a number of citations
309# are issued for the "sale of class 'B' alcohol after prohibited
310# hours" within the deviated hour of this change every year....
311#
312# From Douglas R. Bomberg (2007-03-12):
313# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
314# Statue 175 closer in synch with the US Congress' intent....
315# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
316
317# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
318Rule Chicago 1920 only - Jun 13 2:00 1:00 D
319Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
320Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
321Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
322Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
323Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
324# Zone NAME GMTOFF RULES FORMAT [UNTIL]
325Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
326 -6:00 US C%sT 1920
327 -6:00 Chicago C%sT 1936 Mar 1 2:00
328 -5:00 - EST 1936 Nov 15 2:00
329 -6:00 Chicago C%sT 1942
330 -6:00 US C%sT 1946
331 -6:00 Chicago C%sT 1967
332 -6:00 US C%sT
333# Oliver County, ND switched from mountain to central time on 1992-10-25.
334Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
335 -7:00 US M%sT 1992 Oct 25 02:00
336 -6:00 US C%sT
337# Morton County, ND, switched from mountain to central time on
338# 2003-10-26, except for the area around Mandan which was already central time.
339# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
340# Officially this switch also included part of Sioux County, and
341# Jones, Mellette, and Todd Counties in South Dakota;
342# but in practice these other counties were already observing central time.
343# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
344Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
345 -7:00 US M%sT 2003 Oct 26 02:00
346 -6:00 US C%sT
347
348# From Josh Findley (2011-01-21):
349# ...it appears that Mercer County, North Dakota, changed from the
350# mountain time zone to the central time zone at the last transition from
351# daylight-saving to standard time (on Nov. 7, 2010):
352# <a href="http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm">
353# http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
354# </a>
355# <a href="http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html">
356# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
357# </a>
358
359# From Andy Lipscomb (2011-01-24):
360# ...according to the Census Bureau, the largest city is Beulah (although
361# it's commonly referred to as Beulah-Hazen, with Hazen being the next
362# largest city in Mercer County). Google Maps places Beulah's city hall
363# at 4715'51" north, 10146'40" west, which yields an offset of 6h47'07".
364
365Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
366 -7:00 US M%sT 2010 Nov 7 2:00
367 -6:00 US C%sT
368
369# US mountain time, represented by Denver
370#
371# Colorado, far western Kansas, Montana, western
372# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
373# New Mexico, southwestern North Dakota,
374# western South Dakota, far western Texas (El Paso County, Hudspeth County,
375# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
376#
377# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
378Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
379Rule Denver 1920 only - Oct lastSun 2:00 0 S
380Rule Denver 1921 only - May 22 2:00 0 S
381Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
382Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
383# Zone NAME GMTOFF RULES FORMAT [UNTIL]
384Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
385 -7:00 US M%sT 1920
386 -7:00 Denver M%sT 1942
387 -7:00 US M%sT 1946
388 -7:00 Denver M%sT 1967
389 -7:00 US M%sT
390
391# US Pacific time, represented by Los Angeles
392#
393# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
394# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
395# and the northern three-quarters of Idaho county),
396# most of Nevada, most of Oregon, and Washington
397#
398# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
399Rule CA 1948 only - Mar 14 2:00 1:00 D
400Rule CA 1949 only - Jan 1 2:00 0 S
401Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
402Rule CA 1950 1961 - Sep lastSun 2:00 0 S
403Rule CA 1962 1966 - Oct lastSun 2:00 0 S
404# Zone NAME GMTOFF RULES FORMAT [UNTIL]
405Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
406 -8:00 US P%sT 1946
407 -8:00 CA P%sT 1967
408 -8:00 US P%sT
409
410# Alaska
411# AK%sT is the modern abbreviation for -9:00 per USNO.
412#
413# From Paul Eggert (2001-05-30):
414# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
415# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
416# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
417# also a Friday. Include only the time zone part of this transition,
418# ignoring the switch from Julian to Gregorian, since we can't represent
419# the Julian calendar.
420#
421# As far as we know, none of the exact locations mentioned below were
422# permanently inhabited in 1867 by anyone using either calendar.
423# (Yakutat was colonized by the Russians in 1799, but the settlement
424# was destroyed in 1805 by a Yakutat-kon war party.) However, there
425# were nearby inhabitants in some cases and for our purposes perhaps
426# it's best to simply use the official transition.
427#
428
429# From Steve Ferguson (2011-01-31):
430# The author lives in Alaska and many of the references listed are only
431# available to Alaskan residents.
432#
433# <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98">
434# http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98
435# </a>
436
437# From Arthur David Olson (2011-02-01):
438# Here's database-relevant material from the 2001 "Alaska History" article:
439#
440# On September 20 [1979]...DOT...officials decreed that on April 27,
441# 1980, Juneau and other nearby communities would move to Yukon Time.
442# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
443# Pacific Time.
444#
445# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
446# Department's September 1979 decision. Juneau and other communities in
447# northern Southeast reverted to Pacific Time on October 26.
448#
449# On October 28 [1983]...the Metlakatla Indian Community Council voted
450# unanimously to keep the reservation on Pacific Time.
451#
452# According to DOT official Joanne Petrie, Indian reservations are not
453# bound to follow time zones imposed by neighboring jurisdictions.
454#
455# (The last is consistent with how the database now handles the Navajo
456# Nation.)
457
458# From Arthur David Olson (2011-02-09):
459# I just spoke by phone with a staff member at the Metlakatla Indian
460# Community office (using contact information available at
461# <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla">
462# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
463# </a>).
464# It's shortly after 1:00 here on the east coast of the United States;
465# the staffer said it was shortly after 10:00 there. When I asked whether
466# that meant they were on Pacific time, they said no--they were on their
467# own time. I asked about daylight saving; they said it wasn't used. I
468# did not inquire about practices in the past.
469
470# From Arthur David Olson (2011-08-17):
471# For lack of better information, assume that Metlakatla's
472# abandonment of use of daylight saving resulted from the 1983 vote.
473
474# Zone NAME GMTOFF RULES FORMAT [UNTIL]
475Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
476 -8:57:41 - LMT 1900 Aug 20 12:00
477 -8:00 - PST 1942
478 -8:00 US P%sT 1946
479 -8:00 - PST 1969
480 -8:00 US P%sT 1980 Apr 27 2:00
481 -9:00 US Y%sT 1980 Oct 26 2:00
482 -8:00 US P%sT 1983 Oct 30 2:00
483 -9:00 US Y%sT 1983 Nov 30
484 -9:00 US AK%sT
485Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
486 -9:01:13 - LMT 1900 Aug 20 12:00
487 -8:00 - PST 1942
488 -8:00 US P%sT 1946
489 -8:00 - PST 1969
490 -8:00 US P%sT 1983 Oct 30 2:00
491 -9:00 US Y%sT 1983 Nov 30
492 -9:00 US AK%sT
493Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
494 -8:46:18 - LMT 1900 Aug 20 12:00
495 -8:00 - PST 1942
496 -8:00 US P%sT 1946
497 -8:00 - PST 1969
498 -8:00 US P%sT 1983 Oct 30 2:00
499 -8:00 - MeST
500Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
501 -9:18:55 - LMT 1900 Aug 20 12:00
502 -9:00 - YST 1942
503 -9:00 US Y%sT 1946
504 -9:00 - YST 1969
505 -9:00 US Y%sT 1983 Nov 30
506 -9:00 US AK%sT
507Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
508 -9:59:36 - LMT 1900 Aug 20 12:00
509 -10:00 - CAT 1942
510 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
511 -10:00 US CAT/CAPT 1946 # Peace
512 -10:00 - CAT 1967 Apr
513 -10:00 - AHST 1969
514 -10:00 US AH%sT 1983 Oct 30 2:00
515 -9:00 US Y%sT 1983 Nov 30
516 -9:00 US AK%sT
517Zone America/Nome 12:58:21 - LMT 1867 Oct 18
518 -11:01:38 - LMT 1900 Aug 20 12:00
519 -11:00 - NST 1942
520 -11:00 US N%sT 1946
521 -11:00 - NST 1967 Apr
522 -11:00 - BST 1969
523 -11:00 US B%sT 1983 Oct 30 2:00
524 -9:00 US Y%sT 1983 Nov 30
525 -9:00 US AK%sT
526Zone America/Adak 12:13:21 - LMT 1867 Oct 18
527 -11:46:38 - LMT 1900 Aug 20 12:00
528 -11:00 - NST 1942
529 -11:00 US N%sT 1946
530 -11:00 - NST 1967 Apr
531 -11:00 - BST 1969
532 -11:00 US B%sT 1983 Oct 30 2:00
533 -10:00 US AH%sT 1983 Nov 30
534 -10:00 US HA%sT
535# The following switches don't quite make our 1970 cutoff.
536#
537# Shanks writes that part of southwest Alaska (e.g. Aniak)
538# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
539# and another part (e.g. Akiak) made the same switch five weeks later.
540#
541# From David Flater (2004-11-09):
542# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
543# Historic Preservation Commission, provided this information, which
544# suggests that Unalaska deviated from statutory time from early 1967
545# possibly until 1983:
546#
547# Minutes of the Unalaska City Council Meeting, January 10, 1967:
548# "Except for St. Paul and Akutan, Unalaska is the only important
549# location not on Alaska Standard Time. The following resolution was
550# made by William Robinson and seconded by Henry Swanson: Be it
551# resolved that the City of Unalaska hereby goes to Alaska Standard
552# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
553# January 14, Alaska Standard Time.) This resolution was passed with
554# three votes for and one against."
555
556# Hawaii
557
558# From Arthur David Olson (2010-12-09):
559# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
560# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
561# the article is available at
562# <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
563# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
564# </a>
565# and indicates that standard time was adopted effective noon, January
566# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
567# saving for the period between the last Sunday of each April and the
568# last Sunday of each September, but less than a month later repealed the
569# act," (page 220), that year-round daylight saving time was in effect
570# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
571# when clocks changed) and that clocks were changed by 30 minutes
572# effective the second Sunday of June, 1947 (page 219, with no time of
573# day given for when clocks changed). A footnote for the 1933 changes
574# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
575# and Act 163 (approved 21 May 1933)."
576
577# From Arthur David Olson (2011-01-19):
578# The following is from "Laws of the Territory of Hawaii Passed by the
579# Seventeenth Legislature: Regular Session 1933," available (as of
580# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
581# 90...At 2 o'clock ante meridian of the last Sunday in April of each
582# year, the standard time of this Territory shall be advanced one
583# hour...This Act shall take effect upon its approval. Approved this 26th
584# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
585# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
586# hereby repealed...This Act shall take effect upon its approval, upon
587# which date the standard time of this Territory shall be restored to
588# that existing immediately prior to the taking effect of said Act 90.
589# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
590# of the Territory of Hawaii."
591#
592# Note that 1933-05-21 was a Sunday.
593# We're left to guess the time of day when Act 163 was approved; guess noon.
594
595Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
596 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
597 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
598 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
599 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
600 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
601 -10:00 - HST
602
603# Now we turn to US areas that have diverged from the consensus since 1970.
604
605# Arizona mostly uses MST.
606
607# From Paul Eggert (2002-10-20):
608#
609# The information in the rest of this paragraph is derived from the
610# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
611# Daylight Saving Time web page (2002-01-23)</a> maintained by the
612# Arizona State Library, Archives and Public Records.
613# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
614# time, but by federal law railroads, airlines, bus lines, military
615# personnel, and some engaged in interstate commerce continued to
616# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
617# Gazette says that was the date the law changed, and that 04-01 was
618# the date the state's clocks would change. In 1945 the State of
619# Arizona used standard time all year, again with exceptions only as
620# mandated by federal law. Arizona observed DST in 1967, but Arizona
621# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
622#
623# Shanks says the 1944 experiment came to an end on 1944-03-17.
624# Go with the Arizona State Library instead.
625
626Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
627 -7:00 US M%sT 1944 Jan 1 00:01
628 -7:00 - MST 1944 Apr 1 00:01
629 -7:00 US M%sT 1944 Oct 1 00:01
630 -7:00 - MST 1967
631 -7:00 US M%sT 1968 Mar 21
632 -7:00 - MST
633# From Arthur David Olson (1988-02-13):
634# A writer from the Inter Tribal Council of Arizona, Inc.,
635# notes in private correspondence dated 1987-12-28 that "Presently, only the
636# Navajo Nation participates in the Daylight Saving Time policy, due to its
637# large size and location in three states." (The "only" means that other
638# tribal nations don't use DST.)
639
640Link America/Denver America/Shiprock
641
642# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
643# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
644# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
645# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
646# Teton, Twin Falls, Valley, Washington counties, and the southern
647# quarter of Idaho county) and eastern Oregon (most of Malheur County)
648# switched four weeks late in 1974.
649#
650# Zone NAME GMTOFF RULES FORMAT [UNTIL]
651Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
652 -8:00 US P%sT 1923 May 13 2:00
653 -7:00 US M%sT 1974
654 -7:00 - MST 1974 Feb 3 2:00
655 -7:00 US M%sT
656
657# Indiana
658#
659# For a map of Indiana's time zone regions, see:
660# <a href="http://www.mccsc.edu/time.html">
661# What time is it in Indiana?
662# </a> (2006-03-01)
663#
664# From Paul Eggert (2007-08-17):
665# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
666# with the following exceptions:
667#
668# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
669# Vandenburgh, and Warrick counties have been like America/Chicago.
670#
671# - Dearborn and Ohio counties have been like America/New_York.
672#
673# - Clark, Floyd, and Harrison counties have been like
674# America/Kentucky/Louisville.
675#
676# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
677# and Switzerland counties have their own time zone histories as noted below.
678#
679# Shanks partitioned Indiana into 345 regions, each with its own time history,
680# and wrote ``Even newspaper reports present contradictory information.''
681# Those Hoosiers! Such a flighty and changeable people!
682# Fortunately, most of the complexity occurred before our cutoff date of 1970.
683#
684# Other than Indianapolis, the Indiana place names are so nondescript
685# that they would be ambiguous if we left them at the `America' level.
686# So we reluctantly put them all in a subdirectory `America/Indiana'.
687
688# From Paul Eggert (2005-08-16):
689# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
690
691# From Nathan Stratton Treadway (2006-03-30):
692# http://www.dot.gov/affairs/dot0406.htm [3705 B]
693# From Deborah Goldsmith (2006-01-18):
694# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
695# From Paul Eggert (2006-01-20):
696# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
697# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
698# Eastern Time Zone to the Central Time Zone.... The effective date of
699# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
700# changeover date from standard time to Daylight Saving Time."
701# Strictly speaking, this means the affected counties will change their
702# clocks twice that night, but this obviously is in error. The intent
703# is that 01:59:59 EST be followed by 02:00:00 CDT.
704
705# From Gwillim Law (2007-02-10):
706# The Associated Press has been reporting that Pulaski County, Indiana is
707# going to switch from Central to Eastern Time on March 11, 2007....
708# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
709
710# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
711Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
712Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
713Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
714# Zone NAME GMTOFF RULES FORMAT [UNTIL]
715Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
716 -6:00 US C%sT 1920
717 -6:00 Indianapolis C%sT 1942
718 -6:00 US C%sT 1946
719 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
720 -5:00 - EST 1957 Sep 29 2:00
721 -6:00 - CST 1958 Apr 27 2:00
722 -5:00 - EST 1969
723 -5:00 US E%sT 1971
724 -5:00 - EST 2006
725 -5:00 US E%sT
726#
727# Eastern Crawford County, Indiana, left its clocks alone in 1974,
728# as well as from 1976 through 2005.
729# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
730Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
731Rule Marengo 1951 only - Sep lastSun 2:00 0 S
732Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
733Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
734# Zone NAME GMTOFF RULES FORMAT [UNTIL]
735Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
736 -6:00 US C%sT 1951
737 -6:00 Marengo C%sT 1961 Apr 30 2:00
738 -5:00 - EST 1969
739 -5:00 US E%sT 1974 Jan 6 2:00
740 -6:00 1:00 CDT 1974 Oct 27 2:00
741 -5:00 US E%sT 1976
742 -5:00 - EST 2006
743 -5:00 US E%sT
744#
745# Daviess, Dubois, Knox, and Martin Counties, Indiana,
746# switched from eastern to central time in April 2006, then switched back
747# in November 2007.
748# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
749Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
750Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
751Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
752Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
753Rule Vincennes 1955 only - May 1 0:00 1:00 D
754Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
755Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
756Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
757Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
758# Zone NAME GMTOFF RULES FORMAT [UNTIL]
759Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
760 -6:00 US C%sT 1946
761 -6:00 Vincennes C%sT 1964 Apr 26 2:00
762 -5:00 - EST 1969
763 -5:00 US E%sT 1971
764 -5:00 - EST 2006 Apr 2 2:00
765 -6:00 US C%sT 2007 Nov 4 2:00
766 -5:00 US E%sT
767#
768# Perry County, Indiana, switched from eastern to central time in April 2006.
769# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
770Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
771Rule Perry 1946 only - Sep lastSun 2:00 0 S
772Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
773Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
774Rule Perry 1955 only - May 1 0:00 1:00 D
775Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
776Rule Perry 1960 only - Oct lastSun 2:00 0 S
777Rule Perry 1961 only - Sep lastSun 2:00 0 S
778Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
779# Zone NAME GMTOFF RULES FORMAT [UNTIL]
780Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
781 -6:00 US C%sT 1946
782 -6:00 Perry C%sT 1964 Apr 26 2:00
783 -5:00 - EST 1969
784 -5:00 US E%sT 1971
785 -5:00 - EST 2006 Apr 2 2:00
786 -6:00 US C%sT
787#
788# Pike County, Indiana moved from central to eastern time in 1977,
789# then switched back in 2006, then switched back again in 2007.
790# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
791Rule Pike 1955 only - May 1 0:00 1:00 D
792Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
793Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
794Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
795# Zone NAME GMTOFF RULES FORMAT [UNTIL]
796Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
797 -6:00 US C%sT 1955
798 -6:00 Pike C%sT 1965 Apr 25 2:00
799 -5:00 - EST 1966 Oct 30 2:00
800 -6:00 US C%sT 1977 Oct 30 2:00
801 -5:00 - EST 2006 Apr 2 2:00
802 -6:00 US C%sT 2007 Nov 4 2:00
803 -5:00 US E%sT
804#
805# Starke County, Indiana moved from central to eastern time in 1991,
806# then switched back in 2006.
807# From Arthur David Olson (1991-10-28):
808# An article on page A3 of the Sunday, 1991-10-27 Washington Post
809# notes that Starke County switched from Central time to Eastern time as of
810# 1991-10-27.
811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
812Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
813Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
814Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
815Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
816Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
817# Zone NAME GMTOFF RULES FORMAT [UNTIL]
818Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
819 -6:00 US C%sT 1947
820 -6:00 Starke C%sT 1962 Apr 29 2:00
821 -5:00 - EST 1963 Oct 27 2:00
822 -6:00 US C%sT 1991 Oct 27 2:00
823 -5:00 - EST 2006 Apr 2 2:00
824 -6:00 US C%sT
825#
826# Pulaski County, Indiana, switched from eastern to central time in
827# April 2006 and then switched back in March 2007.
828# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
829Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
830Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
831Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
832Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
833# Zone NAME GMTOFF RULES FORMAT [UNTIL]
834Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
835 -6:00 US C%sT 1946
836 -6:00 Pulaski C%sT 1961 Apr 30 2:00
837 -5:00 - EST 1969
838 -5:00 US E%sT 1971
839 -5:00 - EST 2006 Apr 2 2:00
840 -6:00 US C%sT 2007 Mar 11 2:00
841 -5:00 US E%sT
842#
843# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
844# Zone NAME GMTOFF RULES FORMAT [UNTIL]
845Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
846 -6:00 US C%sT 1954 Apr 25 2:00
847 -5:00 - EST 1969
848 -5:00 US E%sT 1973
849 -5:00 - EST 2006
850 -5:00 US E%sT
851
852# Part of Kentucky left its clocks alone in 1974.
853# This also includes Clark, Floyd, and Harrison counties in Indiana.
854# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
855Rule Louisville 1921 only - May 1 2:00 1:00 D
856Rule Louisville 1921 only - Sep 1 2:00 0 S
857Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
858Rule Louisville 1941 only - Sep lastSun 2:00 0 S
859Rule Louisville 1946 only - Jun 2 2:00 0 S
860Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
861Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
862# Zone NAME GMTOFF RULES FORMAT [UNTIL]
863Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
864 -6:00 US C%sT 1921
865 -6:00 Louisville C%sT 1942
866 -6:00 US C%sT 1946
867 -6:00 Louisville C%sT 1961 Jul 23 2:00
868 -5:00 - EST 1968
869 -5:00 US E%sT 1974 Jan 6 2:00
870 -6:00 1:00 CDT 1974 Oct 27 2:00
871 -5:00 US E%sT
872#
873# Wayne County, Kentucky
874#
875# From
876# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
877# Lake Cumberland LIFE
878# </a> (1999-01-29) via WKYM-101.7:
879# Clinton County has joined Wayne County in asking the DoT to change from
880# the Central to the Eastern time zone.... The Wayne County government made
881# the same request in December. And while Russell County officials have not
882# taken action, the majority of respondents to a poll conducted there in
883# August indicated they would like to change to "fast time" also.
884# The three Lake Cumberland counties are the farthest east of any U.S.
885# location in the Central time zone.
886#
887# From Rich Wales (2000-08-29):
888# After prolonged debate, and despite continuing deep differences of opinion,
889# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
890# (-0500) time. They won't "fall back" this year. See Sara Shipley,
891# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
892#
893# From Paul Eggert (2001-07-16):
894# The final rule was published in the
895# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
896# Federal Register 65, 160 (2000-08-17), page 50154-50158.
897# </a>
898#
899Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
900 -6:00 US C%sT 1946
901 -6:00 - CST 1968
902 -6:00 US C%sT 2000 Oct 29 2:00
903 -5:00 US E%sT
904
905
906# From Rives McDow (2000-08-30):
907# Here ... are all the changes in the US since 1985.
908# Kearny County, KS (put all of county on central;
909# previously split between MST and CST) ... 1990-10
910# Starke County, IN (from CST to EST) ... 1991-10
911# Oliver County, ND (from MST to CST) ... 1992-10
912# West Wendover, NV (from PST TO MST) ... 1999-10
913# Wayne County, KY (from CST to EST) ... 2000-10
914#
915# From Paul Eggert (2001-07-17):
916# We don't know where the line used to be within Kearny County, KS,
917# so omit that change for now.
918# See America/Indiana/Knox for the Starke County, IN change.
919# See America/North_Dakota/Center for the Oliver County, ND change.
920# West Wendover, NV officially switched from Pacific to mountain time on
921# 1999-10-31. See the
922# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
923# Federal Register 64, 203 (1999-10-21), page 56705-56707.
924# </a>
925# However, the Federal Register says that West Wendover already operated
926# on mountain time, and the rule merely made this official;
927# hence a separate tz entry is not needed.
928
929# Michigan
930#
931# From Bob Devine (1988-01-28):
932# Michigan didn't observe DST from 1968 to 1973.
933#
934# From Paul Eggert (1999-03-31):
935# Shanks writes that Michigan started using standard time on 1885-09-18,
936# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
937# that Detroit kept
938#
939# local time until 1900 when the City Council decreed that clocks should
940# be put back twenty-eight minutes to Central Standard Time. Half the
941# city obeyed, half refused. After considerable debate, the decision
942# was rescinded and the city reverted to Sun time. A derisive offer to
943# erect a sundial in front of the city hall was referred to the
944# Committee on Sewers. Then, in 1905, Central time was adopted
945# by city vote.
946#
947# This story is too entertaining to be false, so go with Howse over Shanks.
948#
949# From Paul Eggert (2001-03-06):
950# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
951# one hour in 1914.'' This change is not in Shanks. We have no more
952# info, so omit this for now.
953#
954# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
955# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
956Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
957Rule Detroit 1948 only - Sep lastSun 2:00 0 S
958Rule Detroit 1967 only - Jun 14 2:00 1:00 D
959Rule Detroit 1967 only - Oct lastSun 2:00 0 S
960# Zone NAME GMTOFF RULES FORMAT [UNTIL]
961Zone America/Detroit -5:32:11 - LMT 1905
962 -6:00 - CST 1915 May 15 2:00
963 -5:00 - EST 1942
964 -5:00 US E%sT 1946
965 -5:00 Detroit E%sT 1973
966 -5:00 US E%sT 1975
967 -5:00 - EST 1975 Apr 27 2:00
968 -5:00 US E%sT
969#
970# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
971# switched from EST to CST/CDT in 1973.
972# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
973Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
974Rule Menominee 1946 only - Sep lastSun 2:00 0 S
975Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
976Rule Menominee 1966 only - Oct lastSun 2:00 0 S
977# Zone NAME GMTOFF RULES FORMAT [UNTIL]
978Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
979 -6:00 US C%sT 1946
980 -6:00 Menominee C%sT 1969 Apr 27 2:00
981 -5:00 - EST 1973 Apr 29 2:00
982 -6:00 US C%sT
983
984# Navassa
985# administered by the US Fish and Wildlife Service
986# claimed by US under the provisions of the 1856 Guano Islands Act
987# also claimed by Haiti
988# occupied 1857/1900 by the Navassa Phosphate Co
989# US lighthouse 1917/1996-09
990# currently uninhabited
991# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
992# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
993# Jimmy Skaggs, _The Great Guano Rush_ (1994).
994
995################################################################################
996
997
998# From Paul Eggert (2006-03-22):
999# A good source for time zone historical data outside the U.S. is
1000# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1001# San Diego: ACS Publications, Inc. (2003).
1002#
1003# Gwillim Law writes that a good source
1004# for recent time zone data is the International Air Transport
1005# Association's Standard Schedules Information Manual (IATA SSIM),
1006# published semiannually. Law sent in several helpful summaries
1007# of the IATA's data after 1990.
1008#
1009# Except where otherwise noted, Shanks & Pottenger is the source for
1010# entries through 1990, and IATA SSIM is the source for entries afterwards.
1011#
1012# Other sources occasionally used include:
1013#
1014# Edward W. Whitman, World Time Differences,
1015# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1016# which I found in the UCLA library.
1017#
1018# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1019# William Willett, The Waste of Daylight, 19th edition
1020# </a> (1914-03)
1021#
|
| 1022# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1023# <http://www.jstor.org/stable/1774359>.
1024#
|
1022# See the `europe' file for Greenland.
1023
1024# Canada
1025
1026# From Alain LaBont<e'> (1994-11-14):
1027# I post here the time zone abbreviations standardized in Canada
1028# for both English and French in the CAN/CSA-Z234.4-89 standard....
1029#
1030# UTC Standard time Daylight savings time
1031# offset French English French English
1032# -2:30 - - HAT NDT
1033# -3 - - HAA ADT
1034# -3:30 HNT NST - -
1035# -4 HNA AST HAE EDT
1036# -5 HNE EST HAC CDT
1037# -6 HNC CST HAR MDT
1038# -7 HNR MST HAP PDT
1039# -8 HNP PST HAY YDT
1040# -9 HNY YST - -
1041#
1042# HN: Heure Normale ST: Standard Time
1043# HA: Heure Avanc<e'>e DT: Daylight saving Time
1044#
1045# A: de l'Atlantique Atlantic
1046# C: du Centre Central
1047# E: de l'Est Eastern
1048# M: Mountain
1049# N: Newfoundland
1050# P: du Pacifique Pacific
1051# R: des Rocheuses
1052# T: de Terre-Neuve
1053# Y: du Yukon Yukon
1054#
1055# From Paul Eggert (1994-11-22):
1056# Alas, this sort of thing must be handled by localization software.
1057
1058# Unless otherwise specified, the data for Canada are all from Shanks
1059# & Pottenger.
1060
1061# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1062# 2007-03-01):
1063# The British Columbia government announced yesterday that it will
1064# adjust daylight savings next year to align with changes in the
1065# U.S. and the rest of Canada....
1066# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1067# ...
1068# Nova Scotia
1069# Daylight saving time will be extended by four weeks starting in 2007....
1070# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1071#
1072# [For New Brunswick] the new legislation dictates that the time change is to
1073# be done at 02:00 instead of 00:01.
1074# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1075# ...
1076# Manitoba has traditionally changed the clock every fall at 03:00.
1077# As of 2006, the transition is to take place one hour earlier at 02:00.
1078# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1079# ...
1080# [Alberta, Ontario, Quebec] will follow US rules.
1081# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1082# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1083# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1084# ...
1085# P.E.I. will follow US rules....
1086# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1087# ...
1088# Province of Newfoundland and Labrador....
1089# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1090# ...
1091# Yukon
1092# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1093# ...
1094# N.W.T. will follow US rules. Whoever maintains the government web site
1095# does not seem to believe in bookmarks. To see the news release, click the
1096# following link and search for "Daylight Savings Time Change". Press the
1097# "Daylight Savings Time Change" link; it will fire off a popup using
1098# JavaScript.
1099# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1100# ...
1101# Nunavut
1102# An amendment to the Interpretation Act was registered on February 19/2007....
1103# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1104
1105# From Paul Eggert (2006-04-25):
1106# H. David Matthews and Mary Vincent's map
1107# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1108# "It's about TIME", _Canadian Geographic_ (September-October 1998)
1109# </a> contains detailed boundaries for regions observing nonstandard
1110# time and daylight saving time arrangements in Canada circa 1998.
1111#
1112# INMS, the Institute for National Measurement Standards in Ottawa, has <a
1113# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1114# information about standard and daylight saving time zones in Canada.
1115# </a> (updated periodically).
1116# Its unofficial information is often taken from Matthews and Vincent.
1117
1118# From Paul Eggert (2006-06-27):
1119# For now, assume all of DST-observing Canada will fall into line with the
1120# new US DST rules,
1121
1122# From Chris Walton (2011-12-01)
1123# In the first of Tammy Hardwick's articles
1124# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1125# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1126# </a>
1127# she quotes the Friday November 1/1918 edition of the Creston Review.
1128# The quote includes these two statements:
1129# 'Sunday the CPR went back to the old system of time...'
1130# '... The daylight saving scheme was dropped all over Canada at the same time,'
1131# These statements refer to a transition from daylight time to standard time
1132# that occurred nationally on Sunday October 27/1918. This transition was
1133# also documented in the Saturday October 26/1918 edition of the Toronto Star.
1134
1135# In light of that evidence, we alter the date from the earlier believed
1136# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1137# than Thursday) in all Canadian rulesets.
1138
1139# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1140Rule Canada 1918 only - Apr 14 2:00 1:00 D
1141Rule Canada 1918 only - Oct 27 2:00 0 S
1142Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1143Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1144Rule Canada 1945 only - Sep 30 2:00 0 S
1145Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1146Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1147Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1148Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1149Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1150
1151
1152# Newfoundland and Labrador
1153
1154# From Paul Eggert (2000-10-02):
1155# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1156# but the only part of Labrador that follows the rules is the
1157# southeast corner, including Port Hope Simpson and Mary's Harbour,
1158# but excluding, say, Black Tickle.
1159
1160# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1161Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1162Rule StJohns 1917 only - Sep 17 2:00 0 S
1163# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1164Rule StJohns 1919 only - May 5 23:00 1:00 D
1165Rule StJohns 1919 only - Aug 12 23:00 0 S
1166# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1167Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1168Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1169# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1170# Pottenger.
1171Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1172Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1173# Whitman gives the following transitions:
1174# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1175# but go with Shanks & Pottenger and assume they used Canadian rules.
1176# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1177# Apr 30 - Sep 24; go with Shanks & Pottenger.
1178Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1179Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1180Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1181Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1182Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1183# From Paul Eggert (2000-10-02):
1184# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1185# at 00:01 local time. For now, assume it started in 1987.
1186
1187# From Michael Pelley (2011-09-12):
1188# We received today, Monday, September 12, 2011, notification that the
1189# changes to the Newfoundland Standard Time Act have been proclaimed.
1190# The change in the Act stipulates that the change from Daylight Savings
1191# Time to Standard Time and from Standard Time to Daylight Savings Time
1192# now occurs at 2:00AM.
1193# ...
1194# <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1195# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1196# </a>
1197# ...
1198# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1199# Office of the Chief Information Officer
1200# Executive Council
1201# Government of Newfoundland & Labrador
1202
1203Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1204Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1205Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1206Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1207Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1208Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1209#
1210# St John's has an apostrophe, but Posix file names can't have apostrophes.
1211# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1212Zone America/St_Johns -3:30:52 - LMT 1884
1213 -3:30:52 StJohns N%sT 1918
1214 -3:30:52 Canada N%sT 1919
1215 -3:30:52 StJohns N%sT 1935 Mar 30
1216 -3:30 StJohns N%sT 1942 May 11
1217 -3:30 Canada N%sT 1946
1218 -3:30 StJohns N%sT 2011 Nov
1219 -3:30 Canada N%sT
1220
1221# most of east Labrador
1222
1223# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1224# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1225Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1226 -3:30:52 - NST 1918
1227 -3:30:52 Canada N%sT 1919
1228 -3:30:52 - NST 1935 Mar 30
1229 -3:30 - NST 1936
1230 -3:30 StJohns N%sT 1942 May 11
1231 -3:30 Canada N%sT 1946
1232 -3:30 StJohns N%sT 1966 Mar 15 2:00
1233 -4:00 StJohns A%sT 2011 Nov
1234 -4:00 Canada A%sT
1235
1236
1237# west Labrador, Nova Scotia, Prince Edward I
1238
1239# From Paul Eggert (2006-03-22):
1240# Shanks & Pottenger write that since 1970 most of this region has been like
1241# Halifax. Many locales did not observe peacetime DST until 1972;
1242# Glace Bay, NS is the largest that we know of.
1243# Shanks & Pottenger also write that Liverpool, NS was the only town
1244# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1245# this is a typo.
1246
1247# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1248Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1249Rule Halifax 1916 only - Oct 1 0:00 0 S
1250Rule Halifax 1920 only - May 9 0:00 1:00 D
1251Rule Halifax 1920 only - Aug 29 0:00 0 S
1252Rule Halifax 1921 only - May 6 0:00 1:00 D
1253Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1254Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1255Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1256Rule Halifax 1923 only - Sep 4 0:00 0 S
1257Rule Halifax 1924 only - Sep 15 0:00 0 S
1258Rule Halifax 1925 only - Sep 28 0:00 0 S
1259Rule Halifax 1926 only - May 16 0:00 1:00 D
1260Rule Halifax 1926 only - Sep 13 0:00 0 S
1261Rule Halifax 1927 only - May 1 0:00 1:00 D
1262Rule Halifax 1927 only - Sep 26 0:00 0 S
1263Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1264Rule Halifax 1928 only - Sep 9 0:00 0 S
1265Rule Halifax 1929 only - Sep 3 0:00 0 S
1266Rule Halifax 1930 only - Sep 15 0:00 0 S
1267Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1268Rule Halifax 1932 only - May 1 0:00 1:00 D
1269Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1270Rule Halifax 1933 only - Oct 2 0:00 0 S
1271Rule Halifax 1934 only - May 20 0:00 1:00 D
1272Rule Halifax 1934 only - Sep 16 0:00 0 S
1273Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1274Rule Halifax 1935 only - Sep 30 0:00 0 S
1275Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1276Rule Halifax 1936 only - Sep 14 0:00 0 S
1277Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1278Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1279Rule Halifax 1939 only - May 28 0:00 1:00 D
1280Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1281Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1282Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1283Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1284Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1285Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1286Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1287Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1288Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1289# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1290Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1291 -4:00 Halifax A%sT 1918
1292 -4:00 Canada A%sT 1919
1293 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1294 -4:00 Canada A%sT 1946
1295 -4:00 Halifax A%sT 1974
1296 -4:00 Canada A%sT
1297Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1298 -4:00 Canada A%sT 1953
1299 -4:00 Halifax A%sT 1954
1300 -4:00 - AST 1972
1301 -4:00 Halifax A%sT 1974
1302 -4:00 Canada A%sT
1303
1304# New Brunswick
1305
1306# From Paul Eggert (2007-01-31):
1307# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1308# says they changed at 00:01 through 2006, and
1309# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1310# clear that this was the case since at least 1993.
1311# For now, assume it started in 1993.
1312
1313# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1314Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1315Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1316Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1317Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1318Rule Moncton 1939 only - May 27 1:00 1:00 D
1319Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1320Rule Moncton 1940 only - May 19 1:00 1:00 D
1321Rule Moncton 1941 only - May 4 1:00 1:00 D
1322Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1323Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1324Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1325Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1326Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1327# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1328Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1329 -5:00 - EST 1902 Jun 15
1330 -4:00 Canada A%sT 1933
1331 -4:00 Moncton A%sT 1942
1332 -4:00 Canada A%sT 1946
1333 -4:00 Moncton A%sT 1973
1334 -4:00 Canada A%sT 1993
1335 -4:00 Moncton A%sT 2007
1336 -4:00 Canada A%sT
1337
1338# Quebec
1339
1340# From Paul Eggert (2006-07-09):
1341# Shanks & Pottenger write that since 1970 most of Quebec has been
1342# like Montreal.
1343
1344# From Paul Eggert (2006-06-27):
1345# Matthews and Vincent (1998) also write that Quebec east of the -63
1346# meridian is supposed to observe AST, but residents as far east as
1347# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1348# In "Official time in Quebec" the Quebec department of justice writes in
1349# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1350# that "The residents of the Municipality of the
1351# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1352# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1353# written and use Atlantic standard time all year round. The same applies to
1354# the residents of the Native facilities along the lower North Shore."
1355# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1356# says this common practice was codified into law as of 2007.
1357# For lack of better info, guess this practice began around 1970, contra to
1358# Shanks & Pottenger who have this region observing AST/ADT.
1359
1360# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1361Rule Mont 1917 only - Mar 25 2:00 1:00 D
1362Rule Mont 1917 only - Apr 24 0:00 0 S
1363Rule Mont 1919 only - Mar 31 2:30 1:00 D
1364Rule Mont 1919 only - Oct 25 2:30 0 S
1365Rule Mont 1920 only - May 2 2:30 1:00 D
1366Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1367Rule Mont 1921 only - May 1 2:00 1:00 D
1368Rule Mont 1922 only - Apr 30 2:00 1:00 D
1369Rule Mont 1924 only - May 17 2:00 1:00 D
1370Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1371Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1372# The 1927-to-1937 rules can be expressed more simply as
1373# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1374# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1375# The rules below avoid use of 24:00
1376# (which pre-1998 versions of zic cannot handle).
1377Rule Mont 1927 only - May 1 0:00 1:00 D
1378Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1379Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1380Rule Mont 1932 only - May 1 0:00 1:00 D
1381Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1382Rule Mont 1933 only - Oct 1 0:00 0 S
1383Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1384Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1385Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1386Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1387Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1388Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1389
1390# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1391Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1392 -4:00 Canada A%sT 1970
1393 -4:00 - AST
1394Zone America/Montreal -4:54:16 - LMT 1884
1395 -5:00 Mont E%sT 1918
1396 -5:00 Canada E%sT 1919
1397 -5:00 Mont E%sT 1942 Feb 9 2:00s
1398 -5:00 Canada E%sT 1946
1399 -5:00 Mont E%sT 1974
1400 -5:00 Canada E%sT
1401
1402
1403# Ontario
1404
1405# From Paul Eggert (2006-07-09):
1406# Shanks & Pottenger write that since 1970 most of Ontario has been like
1407# Toronto.
1408# Thunder Bay skipped DST in 1973.
1409# Many smaller locales did not observe peacetime DST until 1974;
1410# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1411# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1412
1413# From Mark Brader (2003-07-26):
1414# [According to the Toronto Star] Orillia, Ontario, adopted DST
1415# effective Saturday, 1912-06-22, 22:00; the article mentions that
1416# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1417# have already done so. In Orillia DST was to run until Saturday,
1418# 1912-08-31 (no time mentioned), but it was met with considerable
1419# hostility from certain segments of the public, and was revoked after
1420# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1421# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1422# earlier in June).
1423#
1424# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1425
1426# From Paul Eggert (1997-10-17):
1427# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1428# says that Atikokan, Ontario currently does not observe DST,
1429# but will vote on 11-10 whether to use EST/EDT.
1430# He also writes that the
1431# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1432# Ontario Time Act (1990, Chapter T.9)
1433# </a>
1434# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1435# Officially Atikokan is therefore on CST/CDT, and most likely this report
1436# concerns a non-official time observed as a matter of local practice.
1437#
1438# From Paul Eggert (2000-10-02):
1439# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1440# New Osnaburgh observe CST all year, that Big Trout Lake observes
1441# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1442# violation of the official Ontario rules.
1443#
1444# From Paul Eggert (2006-07-09):
1445# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1446# 2005-07-21 Chronicle-Journal, which said:
1447#
1448# The clocks in Atikokan stay set on standard time year-round.
1449# This means they spend about half the time on central time and
1450# the other half on eastern time.
1451#
1452# For the most part, the system works, Mayor Dennis Brown said.
1453#
1454# "The majority of businesses in Atikokan deal more with Eastern
1455# Canada, but there are some that deal with Western Canada," he
1456# said. "I don't see any changes happening here."
1457#
1458# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1459# [New Osnaburgh] follow the same practice."
1460
1461# From Garry McKinnon (2006-07-14) via Chris Walton:
1462# I chatted with a member of my board who has an outstanding memory
1463# and a long history in Atikokan (and in the telecom industry) and he
1464# can say for certain that Atikokan has been practicing the current
1465# time keeping since 1952, at least.
1466
1467# From Paul Eggert (2006-07-17):
1468# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1469# ever since standard time was introduced, but the information from
1470# McKinnon sounds more authoritative. For now, assume that Atikokan
1471# switched to EST immediately after WWII era daylight saving time
1472# ended. This matches the old (less-populous) America/Coral_Harbour
1473# entry since our cutoff date of 1970, so we can move
1474# America/Coral_Harbour to the 'backward' file.
1475
1476# From Mark Brader (2010-03-06):
1477#
1478# Currently the database has:
1479#
1480# # Ontario
1481#
1482# # From Paul Eggert (2006-07-09):
1483# # Shanks & Pottenger write that since 1970 most of Ontario has been like
1484# # Toronto.
1485# # Thunder Bay skipped DST in 1973.
1486# # Many smaller locales did not observe peacetime DST until 1974;
1487# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1488#
1489# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1490# right corner of page 1, it says that Toronto will return to standard
1491# time at 2 am Sunday morning (which agrees with the database), and that:
1492#
1493# The one-hour setback will go into effect throughout most of Ontario,
1494# except in areas like Windsor which remains on standard time all year.
1495#
1496# Windsor is, of course, a lot larger than Nipigon.
1497#
1498# I only came across this incidentally. I don't know if Windsor began
1499# observing DST when Detroit did, or in 1974, or on some other date.
1500#
1501# By the way, the article continues by noting that:
1502#
1503# Some cities in the United States have pushed the deadline back
1504# three weeks and will change over from daylight saving in October.
1505
1506# From Arthur David Olson (2010-07-17):
1507#
1508# "Standard Time and Time Zones in Canada" appeared in
1509# The Journal of The Royal Astronomical Society of Canada,
1510# volume 26, number 2 (February 1932) and, as of 2010-07-17,
1511# was available at
1512# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1513# http://adsabs.harvard.edu/full/1932JRASC..26...49S
1514# </a>
1515#
1516# It includes the text below (starting on page 57):
1517#
1518# A list of the places in Canada using daylight saving time would
1519# require yearly revision. From information kindly furnished by
1520# the provincial governments and by the postmasters in many cities
1521# and towns, it is found that the following places used daylight sav-
1522# ing in 1930. The information for the province of Quebec is definite,
1523# for the other provinces only approximate:
1524#
1525# Province Daylight saving time used
1526# Prince Edward Island Not used.
1527# Nova Scotia In Halifax only.
1528# New Brunswick In St. John only.
1529# Quebec In the following places:
1530# Montreal Lachine
1531# Quebec Mont-Royal
1532# Levis Iberville
1533# St. Lambert Cap de la Madeleine
1534# Verdun Loretteville
1535# Westmount Richmond
1536# Outremont St. Jerome
1537# Longueuil Greenfield Park
1538# Arvida Waterloo
1539# Chambly-Canton Beaulieu
1540# Melbourne La Tuque
1541# St. Theophile Buckingham
1542# Ontario Used generally in the cities and towns along
1543# the southerly part of the province. Not
1544# used in the northwesterlhy part.
1545# Manitoba Not used.
1546# Saskatchewan In Regina only.
1547# Alberta Not used.
1548# British Columbia Not used.
1549#
1550# With some exceptions, the use of daylight saving may be said to be limited
1551# to those cities and towns lying between Quebec city and Windsor, Ont.
1552
1553# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1554Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1555Rule Toronto 1919 only - Oct 26 0:00 0 S
1556Rule Toronto 1920 only - May 2 2:00 1:00 D
1557Rule Toronto 1920 only - Sep 26 0:00 0 S
1558Rule Toronto 1921 only - May 15 2:00 1:00 D
1559Rule Toronto 1921 only - Sep 15 2:00 0 S
1560Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1561# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1562# was meant.
1563Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1564Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1565# The 1927-to-1939 rules can be expressed more simply as
1566# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1567# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1568# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1569# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1570# The rules below avoid use of Sun>=25
1571# (which pre-2004 versions of zic cannot handle).
1572Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1573Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1574Rule Toronto 1932 only - May 1 2:00 1:00 D
1575Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1576Rule Toronto 1933 only - Oct 1 2:00 0 S
1577Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1578Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1579Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1580Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1581Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1582Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1583Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1584Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1585Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1586# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1587# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1588# is wrong, and that he had confirmed it by checking the 1971-10-30
1589# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1590Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1591
1592# From Paul Eggert (2003-07-27):
1593# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1594# Port Arthur, Ontario, the principle of the Bill has been in
1595# operation for the past three years, and in the City of Moose Jaw,
1596# Saskatchewan, for one year."
1597
1598# From David Bryan via Tory Tronrud, Director/Curator,
1599# Thunder Bay Museum (2003-11-12):
1600# There is some suggestion, however, that, by-law or not, daylight
1601# savings time was being practiced in Fort William and Port Arthur
1602# before 1909.... [I]n 1910, the line between the Eastern and Central
1603# Time Zones was permanently moved about two hundred miles west to
1604# include the Thunder Bay area.... When Canada adopted daylight
1605# savings time in 1916, Fort William and Port Arthur, having done so
1606# already, did not change their clocks.... During the Second World
1607# War,... [t]he cities agreed to implement DST during the summer
1608# months for the remainder of the war years.
1609
1610# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1611Zone America/Toronto -5:17:32 - LMT 1895
1612 -5:00 Canada E%sT 1919
1613 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1614 -5:00 Canada E%sT 1946
1615 -5:00 Toronto E%sT 1974
1616 -5:00 Canada E%sT
1617Zone America/Thunder_Bay -5:57:00 - LMT 1895
1618 -6:00 - CST 1910
1619 -5:00 - EST 1942
1620 -5:00 Canada E%sT 1970
1621 -5:00 Mont E%sT 1973
1622 -5:00 - EST 1974
1623 -5:00 Canada E%sT
1624Zone America/Nipigon -5:53:04 - LMT 1895
1625 -5:00 Canada E%sT 1940 Sep 29
1626 -5:00 1:00 EDT 1942 Feb 9 2:00s
1627 -5:00 Canada E%sT
1628Zone America/Rainy_River -6:18:16 - LMT 1895
1629 -6:00 Canada C%sT 1940 Sep 29
1630 -6:00 1:00 CDT 1942 Feb 9 2:00s
1631 -6:00 Canada C%sT
1632Zone America/Atikokan -6:06:28 - LMT 1895
1633 -6:00 Canada C%sT 1940 Sep 29
1634 -6:00 1:00 CDT 1942 Feb 9 2:00s
1635 -6:00 Canada C%sT 1945 Sep 30 2:00
1636 -5:00 - EST
1637
1638
1639# Manitoba
1640
1641# From Rob Douglas (2006-04-06):
1642# the old Manitoba Time Act - as amended by Bill 2, assented to
1643# March 27, 1987 ... said ...
1644# "between two o'clock Central Standard Time in the morning of
1645# the first Sunday of April of each year and two o'clock Central
1646# Standard Time in the morning of the last Sunday of October next
1647# following, one hour in advance of Central Standard Time."...
1648# I believe that the English legislation [of the old time act] had =
1649# been assented to (March 22, 1967)....
1650# Also, as far as I can tell, there was no order-in-council varying
1651# the time of Daylight Saving Time for 2005 and so the provisions of
1652# the 1987 version would apply - the changeover was at 2:00 Central
1653# Standard Time (i.e. not until 3:00 Central Daylight Time).
1654
1655# From Paul Eggert (2006-04-10):
1656# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1657# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1658# it was also 02:00s in 1966.
1659
1660# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1661Rule Winn 1916 only - Apr 23 0:00 1:00 D
1662Rule Winn 1916 only - Sep 17 0:00 0 S
1663Rule Winn 1918 only - Apr 14 2:00 1:00 D
1664Rule Winn 1918 only - Oct 27 2:00 0 S
1665Rule Winn 1937 only - May 16 2:00 1:00 D
1666Rule Winn 1937 only - Sep 26 2:00 0 S
1667Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1668Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1669Rule Winn 1945 only - Sep lastSun 2:00 0 S
1670Rule Winn 1946 only - May 12 2:00 1:00 D
1671Rule Winn 1946 only - Oct 13 2:00 0 S
1672Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1673Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1674Rule Winn 1950 only - May 1 2:00 1:00 D
1675Rule Winn 1950 only - Sep 30 2:00 0 S
1676Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1677Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1678Rule Winn 1959 only - Oct lastSun 2:00 0 S
1679Rule Winn 1960 only - Sep lastSun 2:00 0 S
1680Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1681Rule Winn 1963 only - Sep 22 2:00 0 S
1682Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1683Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1684Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1685# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1686Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1687 -6:00 Winn C%sT 2006
1688 -6:00 Canada C%sT
1689
1690
1691# Saskatchewan
1692
1693# From Mark Brader (2003-07-26):
1694# The first actual adoption of DST in Canada was at the municipal
1695# level. As the [Toronto] Star put it (1912-06-07), "While people
1696# elsewhere have long been talking of legislation to save daylight,
1697# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1698# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1699# presumably late evening, as below), and would run until "the end of
1700# the summer". The discrepancy between municipal time and railroad
1701# time was noted.
1702
1703# From Paul Eggert (2003-07-27):
1704# Willett (1914-03) notes that DST "has been in operation ... in the
1705# City of Moose Jaw, Saskatchewan, for one year."
1706
1707# From Paul Eggert (2006-03-22):
1708# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1709# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1710# Other western towns (e.g. Lloydminster) are like Edmonton.
1711# Matthews and Vincent (1998) write that Denare Beach and Creighton
1712# are like Winnipeg, in violation of Saskatchewan law.
1713
1714# From W. Jones (1992-11-06):
1715# The. . .below is based on information I got from our law library, the
1716# provincial archives, and the provincial Community Services department.
1717# A precise history would require digging through newspaper archives, and
1718# since you didn't say what you wanted, I didn't bother.
1719#
1720# Saskatchewan is split by a time zone meridian (105W) and over the years
1721# the boundary became pretty ragged as communities near it reevaluated
1722# their affiliations in one direction or the other. In 1965 a provincial
1723# referendum favoured legislating common time practices.
1724#
1725# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1726# Saskatchewan 1978) was proclaimed, and established that the eastern
1727# part of Saskatchewan would use CST year round, that districts in
1728# northwest Saskatchewan would by default follow CST but could opt to
1729# follow Mountain Time rules (thus 1 hour difference in the winter and
1730# zero in the summer), and that districts in southwest Saskatchewan would
1731# by default follow MT but could opt to follow CST.
1732#
1733# It took a few years for the dust to settle (I know one story of a town
1734# on one time zone having its school in another, such that a mom had to
1735# serve her family lunch in two shifts), but presently it seems that only
1736# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1737# rules any more; all other districts appear to have used CST year round
1738# since sometime in the 1960s.
1739
1740# From Chris Walton (2006-06-26):
1741# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1742# long and rather painful to read.
1743# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1744
1745# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1746Rule Regina 1918 only - Apr 14 2:00 1:00 D
1747Rule Regina 1918 only - Oct 27 2:00 0 S
1748Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1749Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1750Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1751Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1752Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1753Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1754Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1755Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1756Rule Regina 1945 only - Sep lastSun 2:00 0 S
1757Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1758Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1759Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1760Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1761Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1762Rule Regina 1959 only - Oct lastSun 2:00 0 S
1763#
1764Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1765Rule Swift 1957 only - Oct lastSun 2:00 0 S
1766Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1767Rule Swift 1959 only - Oct lastSun 2:00 0 S
1768Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1769# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1770Zone America/Regina -6:58:36 - LMT 1905 Sep
1771 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1772 -6:00 - CST
1773Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1774 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1775 -7:00 Regina M%sT 1950
1776 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1777 -6:00 - CST
1778
1779
1780# Alberta
1781
1782# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1783Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1784Rule Edm 1918 only - Oct 27 2:00 0 S
1785Rule Edm 1919 only - May 27 2:00 0 S
1786Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1787Rule Edm 1920 only - Oct lastSun 2:00 0 S
1788Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1789Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1790Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1791Rule Edm 1945 only - Sep lastSun 2:00 0 S
1792Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1793Rule Edm 1947 only - Sep lastSun 2:00 0 S
1794Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1795Rule Edm 1967 only - Oct lastSun 2:00 0 S
1796Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1797Rule Edm 1969 only - Oct lastSun 2:00 0 S
1798Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1799Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1800# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1801Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1802 -7:00 Edm M%sT 1987
1803 -7:00 Canada M%sT
1804
1805
1806# British Columbia
1807
1808# From Paul Eggert (2006-03-22):
1809# Shanks & Pottenger write that since 1970 most of this region has
1810# been like Vancouver.
1811# Dawson Creek uses MST. Much of east BC is like Edmonton.
1812# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1813
1814# It seems though that (re: Creston) is not entirely correct:
1815
1816# From Chris Walton (2011-12-01):
1817# There are two areas within the Canadian province of British Columbia
1818# that do not currently observe daylight saving:
1819# a) The Creston Valley (includes the town of Creston and surrounding area)
1820# b) The eastern half of the Peace River Regional District
1821# (includes the cities of Dawson Creek and Fort St. John)
1822
1823# Earlier this year I stumbled across a detailed article about the time
1824# keeping history of Creston; it was written by Tammy Hardwick who is the
1825# manager of the Creston & District Museum. The article was written in May 2009.
1826# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1827# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1828# </a>
1829# According to the article, Creston has not changed its clocks since June 1918.
1830# i.e. Creston has been stuck on UTC-7 for 93 years.
1831# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1832
1833# Unfortunately the exact date for the time change in June 1918 remains
1834# unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1835# ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1836# as plausible as any other date (in June). She also said that after writing the
1837# article she had discovered another time change in 1916; this is the subject
1838# of another article which she wrote in October 2010.
1839# <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1840# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1841# </a>
1842
1843# Here is a summary of the three clock change events in Creston's history:
1844# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1845# Exact date unknown
1846# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1847# Exact date in October unknown; Sunday October 1 is a reasonable guess.
1848# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1849# Exact date in June unknown; Sunday June 2 is a reasonable guess.
1850# note#1:
1851# On Oct 27/1918 when daylight saving ended in the rest of Canada,
1852# Creston did not change its clocks.
1853# note#2:
1854# During WWII when the Federal Government legislated a mandatory clock change,
1855# Creston did not oblige.
1856# note#3:
1857# There is no guarantee that Creston will remain on Mountain Standard Time
1858# (UTC-7) forever.
1859# The subject was debated at least once this year by the town Council.
1860# <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1861# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1862# </a>
1863
1864# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1865# In Creston, that was handled by shifting the area to PST (-8:00) then applying
1866# summer time to cause the offset to be -7:00, the same as it had been before
1867# the change. It can be argued that the timezone abbreviation during this
1868# period should be PDT rather than MST, but that doesn't seem important enough
1869# (to anyone) to further complicate the rules.
1870
1871# The transition dates (and times) are guesses.
1872
1873# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1874Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1875Rule Vanc 1918 only - Oct 27 2:00 0 S
1876Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1877Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1878Rule Vanc 1945 only - Sep 30 2:00 0 S
1879Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1880Rule Vanc 1946 only - Oct 13 2:00 0 S
1881Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1882Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1883# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1884Zone America/Vancouver -8:12:28 - LMT 1884
1885 -8:00 Vanc P%sT 1987
1886 -8:00 Canada P%sT
1887Zone America/Dawson_Creek -8:00:56 - LMT 1884
1888 -8:00 Canada P%sT 1947
1889 -8:00 Vanc P%sT 1972 Aug 30 2:00
1890 -7:00 - MST
1891Zone America/Creston -7:46:04 - LMT 1884
1892 -7:00 - MST 1916 Oct 1
1893 -8:00 - PST 1918 Jun 2
1894 -7:00 - MST
1895
1896# Northwest Territories, Nunavut, Yukon
1897
1898# From Paul Eggert (2006-03-22):
1899# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1900# Mathew Englander (1996-10-07) gives the following refs:
1901# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1902# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1903# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1904# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1905# * O.I.C. 1980/02 established DST.
1906# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1907# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1908# with Englander.
1909# From Chris Walton (2006-06-26):
1910# Here is a link to the old daylight saving portion of the interpretation
1911# act which was last updated in 1987:
1912# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1913
1914# From Rives McDow (1999-09-04):
1915# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1916# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1917# Nunavut moves to single time zone Oct. 31
1918# </a>
1919#
1920# From Antoine Leca (1999-09-06):
1921# We then need to create a new timezone for the Kitikmeot region of Nunavut
1922# to differentiate it from the Yellowknife region.
1923
1924# From Paul Eggert (1999-09-20):
1925# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1926# Basic Facts: The New Territory
1927# </a> (1999) reports that Pangnirtung operates on eastern time,
1928# and that Coral Harbour does not observe DST. We don't know when
1929# Pangnirtung switched to eastern time; we'll guess 1995.
1930
1931# From Rives McDow (1999-11-08):
1932# On October 31, when the rest of Nunavut went to Central time,
1933# Pangnirtung wobbled. Here is the result of their wobble:
1934#
1935# The following businesses and organizations in Pangnirtung use Central Time:
1936#
1937# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1938# Eastern Arctic National Parks, A & D Specialist
1939#
1940# The following businesses and organizations in Pangnirtung use Eastern Time:
1941#
1942# Hamlet office, All other businesses, Both schools, Airport operator
1943#
1944# This has made for an interesting situation there, which warranted the news.
1945# No one there that I spoke with seems concerned, or has plans to
1946# change the local methods of keeping time, as it evidently does not
1947# really interfere with any activities or make things difficult locally.
1948# They plan to celebrate New Year's turn-over twice, one hour apart,
1949# so it appears that the situation will last at least that long.
1950# The Nunavut Intergovernmental Affairs hopes that they will "come to
1951# their senses", but the locals evidently don't see any problem with
1952# the current state of affairs.
1953
1954# From Michaela Rodrigue, writing in the
1955# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1956# Nunatsiaq News (1999-11-19)</a>:
1957# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1958# central - or Nunavut time - for government offices, and eastern time
1959# for municipal offices and schools.... Igloolik [was similar but then]
1960# made the switch to central time on Saturday, Nov. 6.
1961
1962# From Paul Eggert (2000-10-02):
1963# Matthews and Vincent (1998) say the following, but we lack histories
1964# for these potential new Zones.
1965#
1966# The Canadian Forces station at Alert uses Eastern Time while the
1967# handful of residents at the Eureka weather station [in the Central
1968# zone] skip daylight savings. Baffin Island, which is crossed by the
1969# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1970# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1971# Central Time and Southampton Island [in the Central zone] is not
1972# required to use daylight savings.
1973
1974# From
1975# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1976# Nunavut now has two time zones
1977# </a> (2000-11-10):
1978# The Nunavut government would allow its employees in Kugluktuk and
1979# Cambridge Bay to operate on central time year-round, putting them
1980# one hour behind the rest of Nunavut for six months during the winter.
1981# At the end of October the two communities had rebelled against
1982# Nunavut's unified time zone, refusing to shift to eastern time with
1983# the rest of the territory for the winter. Cambridge Bay remained on
1984# central time, while Kugluktuk, even farther west, reverted to
1985# mountain time, which they had used before the advent of Nunavut's
1986# unified time zone in 1999.
1987#
1988# From Rives McDow (2001-01-20), quoting the Nunavut government:
1989# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1990
1991# From Paul Eggert (2000-12-04):
1992# Let's just keep track of the official times for now.
1993
1994# From Rives McDow (2001-03-07):
1995# The premier of Nunavut has issued a ministerial statement advising
1996# that effective 2001-04-01, the territory of Nunavut will revert
1997# back to three time zones (mountain, central, and eastern). Of the
1998# cities in Nunavut, Coral Harbor is the only one that I know of that
1999# has said it will not observe dst, staying on EST year round. I'm
2000# checking for more info, and will get back to you if I come up with
2001# more.
2002# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2003
2004# From Gwillim Law (2005-05-21):
2005# According to maps at
2006# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2007# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2008# (both dated 2003), and
2009# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2010# (from a 1998 Canadian Geographic article), the de facto and de jure time
2011# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2012# round. Using Google, it's easy to find other websites that confirm this.
2013# I wasn't able to find how far back this time regimen goes, but since it
2014# predates the creation of Nunavut, it probably goes back many years....
2015# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2016#
2017# From Paul Eggert (2005-07-26):
2018# For lack of better information, assume that Southampton Island observed
2019# daylight saving only during wartime.
2020
2021# From Chris Walton (2007-03-01):
2022# ... the community of Resolute (located on Cornwallis Island in
2023# Nunavut) moved from Central Time to Eastern Time last November.
2024# Basically the community did not change its clocks at the end of
2025# daylight saving....
2026# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2027
2028# From Chris Walton (2011-03-21):
2029# Back in 2007 I initiated the creation of a new "zone file" for Resolute
2030# Bay. Resolute Bay is a small community located about 900km north of
2031# the Arctic Circle. The zone file was required because Resolute Bay had
2032# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2033#
2034# According to new information which I received last week, Resolute Bay
2035# went back to using UTC-6 in the winter of 2007-2008...
2036#
2037# On March 11/2007 most of Canada went onto daylight saving. On March
2038# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2039# talked to somebody that was both knowledgeable and helpful. I was able
2040# to confirm that Resolute Bay was still operating on UTC-5. It was
2041# explained to me that Resolute Bay had been on the Eastern Time zone
2042# (EST) in the winter, and was now back on the Central Time zone (CDT).
2043# i.e. the time zone had changed twice in the last year but the clocks
2044# had not moved. The residents had to know which time zone they were in
2045# so they could follow the correct TV schedule...
2046#
2047# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2048# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2049# of the phone call, I decided to seek out an alternate source of
2050# information. I found an e-mail address for somebody by the name of
2051# Stephanie Adams whose job was listed as "Inns North Support Officer for
2052# Arctic Co-operatives." I was under the impression that Stephanie lived
2053# and worked in Resolute Bay...
2054#
2055# On March 14/2011 I phoned the hamlet office again. I was told that
2056# Resolute Bay had been using Central Standard Time over the winter of
2057# 2010-2011 and that the clocks had therefore been moved one hour ahead
2058# on March 13/2011. The person I talked to was aware that Resolute Bay
2059# had previously experimented with Eastern Standard Time but he could not
2060# tell me when the practice had stopped.
2061#
2062# On March 17/2011 I searched the Web to find an e-mail address of
2063# somebody that might be able to tell me exactly when Resolute Bay went
2064# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2065# used to be the mayor of Resolute Bay and he apparently owns half the
2066# businesses including "South Camp Inn." This website has some info on
2067# Aziz:
2068# <a href="http://www.uphere.ca/node/493">
2069# http://www.uphere.ca/node/493
2070# </a>
2071#
2072# I sent Aziz an e-mail asking when Resolute Bay had stopped using
2073# Eastern Standard Time.
2074#
2075# Aziz responded quickly with this: "hi, The time was not changed for the
2076# 1 year only, the following year, the community went back to the old way
2077# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2078# the winter Zulu plus 6 hrs"
2079#
2080# This of course conflicted with everything I had ascertained in November 2008.
2081#
2082# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2083# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2084# may want to check with the weather office in Resolute Bay or do a
2085# search on the weather through Env. Canada. web site"
2086#
2087# If I had realized the Stephanie did not live in Resolute Bay I would
2088# never have contacted her. I now believe that all the information I
2089# obtained in November 2008 should be ignored...
2090# I apologize for reporting incorrect information in 2008.
2091
2092# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2093Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2094Rule NT_YK 1918 only - Oct 27 2:00 0 S
2095Rule NT_YK 1919 only - May 25 2:00 1:00 D
2096Rule NT_YK 1919 only - Nov 1 0:00 0 S
2097Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2098Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2099Rule NT_YK 1945 only - Sep 30 2:00 0 S
2100Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2101Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2102Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2103Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2104Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2105# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2106# aka Panniqtuuq
2107Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2108 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2109 -5:00 Canada E%sT 1999 Oct 31 2:00
2110 -6:00 Canada C%sT 2000 Oct 29 2:00
2111 -5:00 Canada E%sT
2112# formerly Frobisher Bay
2113Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2114 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2115 -6:00 Canada C%sT 2000 Oct 29 2:00
2116 -5:00 Canada E%sT
2117# aka Qausuittuq
2118Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2119 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2120 -5:00 - EST 2001 Apr 1 3:00
2121 -6:00 Canada C%sT 2006 Oct 29 2:00
2122 -5:00 - EST 2007 Mar 11 3:00
2123 -6:00 Canada C%sT
2124# aka Kangiqiniq
2125Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2126 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2127 -5:00 - EST 2001 Apr 1 3:00
2128 -6:00 Canada C%sT
2129# aka Iqaluktuuttiaq
2130Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2131 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2132 -6:00 Canada C%sT 2000 Oct 29 2:00
2133 -5:00 - EST 2000 Nov 5 0:00
2134 -6:00 - CST 2001 Apr 1 3:00
2135 -7:00 Canada M%sT
2136Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2137 -7:00 NT_YK M%sT 1980
2138 -7:00 Canada M%sT
2139Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2140 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2141 -7:00 NT_YK M%sT 1980
2142 -7:00 Canada M%sT
2143Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2144 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2145 -8:00 NT_YK P%sT 1980
2146 -8:00 Canada P%sT
2147Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2148 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2149 -8:00 NT_YK P%sT 1980
2150 -8:00 Canada P%sT
2151
2152
2153###############################################################################
2154
2155# Mexico
2156
2157# From Paul Eggert (2001-03-05):
2158# The Investigation and Analysis Service of the
2159# Mexican Library of Congress (MLoC) has published a
2160# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2161# history of Mexican local time (in Spanish)
2162# </a>.
2163#
2164# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2165# (In all cases we go with the MLoC.)
2166# S&P report that Baja was at -8:00 in 1922/1923.
2167# S&P say the 1930 transition in Baja was 1930-11-16.
2168# S&P report no DST during summer 1931.
2169# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2170
2171# From Gwillim Law (2001-02-20):
2172# There are some other discrepancies between the Decrees page and the
2173# tz database. I think they can best be explained by supposing that
2174# the researchers who prepared the Decrees page failed to find some of
2175# the relevant documents.
2176
2177# From Alan Perry (1996-02-15):
2178# A guy from our Mexico subsidiary finally found the Presidential Decree
2179# outlining the timezone changes in Mexico.
2180#
2181# ------------- Begin Forwarded Message -------------
2182#
2183# I finally got my hands on the Official Presidential Decree that sets up the
2184# rules for the DST changes. The rules are:
2185#
2186# 1. The country is divided in 3 timezones:
2187# - Baja California Norte (the Mexico/BajaNorte TZ)
2188# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2189# - The rest of the country (the Mexico/General TZ)
2190#
2191# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2192# at 2:00 AM, the times in each zone are as follows:
2193# BajaNorte: GMT+7
2194# BajaSur: GMT+6
2195# General: GMT+5
2196#
2197# 3. The rest of the year, the times are as follows:
2198# BajaNorte: GMT+8
2199# BajaSur: GMT+7
2200# General: GMT+6
2201#
2202# The Decree was published in Mexico's Official Newspaper on January 4th.
2203#
2204# -------------- End Forwarded Message --------------
2205# From Paul Eggert (1996-06-12):
2206# For an English translation of the decree, see
2207# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2208# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
2209# </a>
2210
2211# From Rives McDow (1998-10-08):
2212# The State of Quintana Roo has reverted back to central STD and DST times
2213# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2214
2215# From Rives McDow (2000-01-10):
2216# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2217# zone 5 hours from the International Date Line, and will not observe daylight
2218# savings time so as to stay on the same time zone as the southern part of
2219# Arizona year round.
2220
2221# From Jesper Norgaard, translating
2222# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2223# In Oaxaca, the 55.000 teachers from the Section 22 of the National
2224# Syndicate of Education Workers, refuse to apply daylight saving each
2225# year, so that the more than 10,000 schools work at normal hour the
2226# whole year.
2227
2228# From Gwillim Law (2001-01-19):
2229# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2230# (translated):...
2231# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2232# that Summer Time will be reduced from seven to five months, starting
2233# this year....
2234# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2235# [translated], says "summer time will ... take effect on the first Sunday
2236# in May, and end on the last Sunday of September.
2237
2238# From Arthur David Olson (2001-01-25):
2239# The 2001-01-24 traditional Washington Post contained the page one
2240# story "Timely Issue Divides Mexicans."...
2241# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2242# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2243# Mexico City and its 20 million residents on a different time than
2244# the rest of the country..." In particular, Lopez Obrador would abolish
2245# observation of Daylight Saving Time.
2246
2247# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2248# Official statute published by the Energy Department
2249# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2250# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2251
2252# From Paul Eggert (2001-03-03):
2253#
2254# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2255# James F. Smith writes in today's LA Times
2256# </a>
2257# * Sonora will continue to observe standard time.
2258# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2259# the Federal District will not adopt DST.
2260# * 4 of 16 district leaders announced they'll ignore the decree.
2261# * The decree does not affect federal-controlled facilities including
2262# the airport, banks, hospitals, and schools.
2263#
2264# For now we'll assume that the Federal District will bow to federal rules.
2265
2266# From Jesper Norgaard (2001-04-01):
2267# I found some references to the Mexican application of daylight
2268# saving, which modifies what I had already sent you, stating earlier
2269# that a number of northern Mexican states would go on daylight
2270# saving. The modification reverts this to only cover Baja California
2271# (Norte), while all other states (except Sonora, who has no daylight
2272# saving all year) will follow the original decree of president
2273# Vicente Fox, starting daylight saving May 6, 2001 and ending
2274# September 30, 2001.
2275# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2276# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2277
2278# From Reuters (2001-09-04):
2279# Mexico's Supreme Court on Tuesday declared that daylight savings was
2280# unconstitutional in Mexico City, creating the possibility the
2281# capital will be in a different time zone from the rest of the nation
2282# next year.... The Supreme Court's ruling takes effect at 2:00
2283# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2284# standard time. "This is so residents of the Federal District are not
2285# subject to unexpected time changes," a statement from the court said.
2286
2287# From Jesper Norgaard Welen (2002-03-12):
2288# ... consulting my local grocery store(!) and my coworkers, they all insisted
2289# that a new decision had been made to reinstate US style DST in Mexico....
2290# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2291# confirms this. Sonora as usual is the only state where DST is not applied.
2292
2293# From Steffen Thorsen (2009-12-28):
2294#
2295# Steffen Thorsen wrote:
2296# > Mexico's House of Representatives has approved a proposal for northern
2297# > Mexico's border cities to share the same daylight saving schedule as
2298# > the United States.
2299# Now this has passed both the Congress and the Senate, so starting from
2300# 2010, some border regions will be the same:
2301# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2302# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2303# </a>
2304# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2305# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2306# </a>
2307# (Spanish)
2308#
2309# Could not find the new law text, but the proposed law text changes are here:
2310# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2311# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2312# </a>
2313# (Gaceta Parlamentaria)
2314#
2315# There is also a list of the votes here:
2316# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2317# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2318# </a>
2319#
2320# Our page:
2321# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2322# http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2323# </a>
2324
2325# From Arthur David Olson (2010-01-20):
2326# The page
2327# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2328# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2329# </a>
2330# includes this text:
2331# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2332# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2333# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2334# Tamaulipas, la aplicación de este horario estacional surtirá efecto
2335# desde las dos horas del segundo domingo de marzo y concluirá a las dos
2336# horas del primer domingo de noviembre.
2337# En los municipios fronterizos que se encuentren ubicados en la franja
2338# fronteriza norte en el territorio comprendido entre la línea
2339# internacional y la línea paralela ubicada a una distancia de veinte
2340# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2341# interior del país, la aplicación de este horario estacional surtirá
2342# efecto desde las dos horas del segundo domingo de marzo y concluirá a
2343# las dos horas del primer domingo de noviembre.
2344
2345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2346Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2347Rule Mexico 1939 only - Jun 25 0:00 0 S
2348Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2349Rule Mexico 1941 only - Apr 1 0:00 0 S
2350Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2351Rule Mexico 1944 only - May 1 0:00 0 S
2352Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2353Rule Mexico 1950 only - Jul 30 0:00 0 S
2354Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2355Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2356Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2357Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2358Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2359Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2360# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2361# Quintana Roo
2362Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2363 -6:00 - CST 1981 Dec 23
2364 -5:00 Mexico E%sT 1998 Aug 2 2:00
2365 -6:00 Mexico C%sT
2366# Campeche, Yucatan
2367Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2368 -6:00 - CST 1981 Dec 23
2369 -5:00 - EST 1982 Dec 2
2370 -6:00 Mexico C%sT
2371# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2372Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2373 -6:00 - CST 1988
2374 -6:00 US C%sT 1989
2375 -6:00 Mexico C%sT 2010
2376 -6:00 US C%sT
2377# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2378Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2379 -6:00 - CST 1988
2380 -6:00 US C%sT 1989
2381 -6:00 Mexico C%sT
2382# Central Mexico
2383Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2384 -7:00 - MST 1927 Jun 10 23:00
2385 -6:00 - CST 1930 Nov 15
2386 -7:00 - MST 1931 May 1 23:00
2387 -6:00 - CST 1931 Oct
2388 -7:00 - MST 1932 Apr 1
2389 -6:00 Mexico C%sT 2001 Sep 30 02:00
2390 -6:00 - CST 2002 Feb 20
2391 -6:00 Mexico C%sT
2392# Chihuahua (near US border)
2393Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2394 -7:00 - MST 1927 Jun 10 23:00
2395 -6:00 - CST 1930 Nov 15
2396 -7:00 - MST 1931 May 1 23:00
2397 -6:00 - CST 1931 Oct
2398 -7:00 - MST 1932 Apr 1
2399 -6:00 - CST 1996
2400 -6:00 Mexico C%sT 1998
2401 -6:00 - CST 1998 Apr Sun>=1 3:00
2402 -7:00 Mexico M%sT 2010
2403 -7:00 US M%sT
2404# Chihuahua (away from US border)
2405Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2406 -7:00 - MST 1927 Jun 10 23:00
2407 -6:00 - CST 1930 Nov 15
2408 -7:00 - MST 1931 May 1 23:00
2409 -6:00 - CST 1931 Oct
2410 -7:00 - MST 1932 Apr 1
2411 -6:00 - CST 1996
2412 -6:00 Mexico C%sT 1998
2413 -6:00 - CST 1998 Apr Sun>=1 3:00
2414 -7:00 Mexico M%sT
2415# Sonora
2416Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2417 -7:00 - MST 1927 Jun 10 23:00
2418 -6:00 - CST 1930 Nov 15
2419 -7:00 - MST 1931 May 1 23:00
2420 -6:00 - CST 1931 Oct
2421 -7:00 - MST 1932 Apr 1
2422 -6:00 - CST 1942 Apr 24
2423 -7:00 - MST 1949 Jan 14
2424 -8:00 - PST 1970
2425 -7:00 Mexico M%sT 1999
2426 -7:00 - MST
2427
2428# From Alexander Krivenyshev (2010-04-21):
2429# According to news, Bahía de Banderas (Mexican state of Nayarit)
2430# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2431# share the same time zone as nearby city Puerto Vallarta, Jalisco).
2432#
2433# (Spanish)
2434# Bahía de Banderas homologa su horario al del centro del
2435# país, a partir de este domingo
2436# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2437# http://www.nayarit.gob.mx/notes.asp?id=20748
2438# </a>
2439#
2440# Bahía de Banderas homologa su horario con el del Centro del
2441# País
2442# <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50">
2443# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50"
2444# </a>
2445#
2446# (English)
2447# Puerto Vallarta and Bahía de Banderas: One Time Zone
2448# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2449# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2450# </a>
2451#
2452# or
2453# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2454# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2455# </a>
2456#
2457# "Mexico's Senate approved the amendments to the Mexican Schedule System that
2458# will allow Bahía de Banderas and Puerto Vallarta to share the same time
2459# zone ..."
2460# Baja California Sur, Nayarit, Sinaloa
2461
2462# From Arthur David Olson (2010-05-01):
2463# Use "Bahia_Banderas" to keep the name to fourteen characters.
2464
2465Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2466 -7:00 - MST 1927 Jun 10 23:00
2467 -6:00 - CST 1930 Nov 15
2468 -7:00 - MST 1931 May 1 23:00
2469 -6:00 - CST 1931 Oct
2470 -7:00 - MST 1932 Apr 1
2471 -6:00 - CST 1942 Apr 24
2472 -7:00 - MST 1949 Jan 14
2473 -8:00 - PST 1970
2474 -7:00 Mexico M%sT
2475
2476Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2477 -7:00 - MST 1927 Jun 10 23:00
2478 -6:00 - CST 1930 Nov 15
2479 -7:00 - MST 1931 May 1 23:00
2480 -6:00 - CST 1931 Oct
2481 -7:00 - MST 1932 Apr 1
2482 -6:00 - CST 1942 Apr 24
2483 -7:00 - MST 1949 Jan 14
2484 -8:00 - PST 1970
2485 -7:00 Mexico M%sT 2010 Apr 4 2:00
2486 -6:00 Mexico C%sT
2487
2488# Baja California (near US border)
2489Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2490 -7:00 - MST 1924
2491 -8:00 - PST 1927 Jun 10 23:00
2492 -7:00 - MST 1930 Nov 15
2493 -8:00 - PST 1931 Apr 1
2494 -8:00 1:00 PDT 1931 Sep 30
2495 -8:00 - PST 1942 Apr 24
2496 -8:00 1:00 PWT 1945 Aug 14 23:00u
2497 -8:00 1:00 PPT 1945 Nov 12 # Peace
2498 -8:00 - PST 1948 Apr 5
2499 -8:00 1:00 PDT 1949 Jan 14
2500 -8:00 - PST 1954
2501 -8:00 CA P%sT 1961
2502 -8:00 - PST 1976
2503 -8:00 US P%sT 1996
2504 -8:00 Mexico P%sT 2001
2505 -8:00 US P%sT 2002 Feb 20
2506 -8:00 Mexico P%sT 2010
2507 -8:00 US P%sT
2508# Baja California (away from US border)
2509Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2510 -7:00 - MST 1924
2511 -8:00 - PST 1927 Jun 10 23:00
2512 -7:00 - MST 1930 Nov 15
2513 -8:00 - PST 1931 Apr 1
2514 -8:00 1:00 PDT 1931 Sep 30
2515 -8:00 - PST 1942 Apr 24
2516 -8:00 1:00 PWT 1945 Aug 14 23:00u
2517 -8:00 1:00 PPT 1945 Nov 12 # Peace
2518 -8:00 - PST 1948 Apr 5
2519 -8:00 1:00 PDT 1949 Jan 14
2520 -8:00 - PST 1954
2521 -8:00 CA P%sT 1961
2522 -8:00 - PST 1976
2523 -8:00 US P%sT 1996
2524 -8:00 Mexico P%sT 2001
2525 -8:00 US P%sT 2002 Feb 20
2526 -8:00 Mexico P%sT
2527# From Paul Eggert (2006-03-22):
2528# Formerly there was an America/Ensenada zone, which differed from
2529# America/Tijuana only in that it did not observe DST from 1976
2530# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2531# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2532# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2533# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2534# DST-observance was a town-by-town matter back then. This concerns
2535# data after 1970 so most likely there should be at least one Zone
2536# other than America/Tijuana for Baja, but it's not clear yet what its
2537# name or contents should be.
2538#
2539# Revillagigedo Is
2540# no information
2541
2542###############################################################################
2543
2544# Anguilla
2545# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2546Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2547 -4:00 - AST
2548
2549# Antigua and Barbuda
2550# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2551Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2552 -5:00 - EST 1951
2553 -4:00 - AST
2554
2555# Bahamas
2556#
| 1025# See the `europe' file for Greenland.
1026
1027# Canada
1028
1029# From Alain LaBont<e'> (1994-11-14):
1030# I post here the time zone abbreviations standardized in Canada
1031# for both English and French in the CAN/CSA-Z234.4-89 standard....
1032#
1033# UTC Standard time Daylight savings time
1034# offset French English French English
1035# -2:30 - - HAT NDT
1036# -3 - - HAA ADT
1037# -3:30 HNT NST - -
1038# -4 HNA AST HAE EDT
1039# -5 HNE EST HAC CDT
1040# -6 HNC CST HAR MDT
1041# -7 HNR MST HAP PDT
1042# -8 HNP PST HAY YDT
1043# -9 HNY YST - -
1044#
1045# HN: Heure Normale ST: Standard Time
1046# HA: Heure Avanc<e'>e DT: Daylight saving Time
1047#
1048# A: de l'Atlantique Atlantic
1049# C: du Centre Central
1050# E: de l'Est Eastern
1051# M: Mountain
1052# N: Newfoundland
1053# P: du Pacifique Pacific
1054# R: des Rocheuses
1055# T: de Terre-Neuve
1056# Y: du Yukon Yukon
1057#
1058# From Paul Eggert (1994-11-22):
1059# Alas, this sort of thing must be handled by localization software.
1060
1061# Unless otherwise specified, the data for Canada are all from Shanks
1062# & Pottenger.
1063
1064# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1065# 2007-03-01):
1066# The British Columbia government announced yesterday that it will
1067# adjust daylight savings next year to align with changes in the
1068# U.S. and the rest of Canada....
1069# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1070# ...
1071# Nova Scotia
1072# Daylight saving time will be extended by four weeks starting in 2007....
1073# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1074#
1075# [For New Brunswick] the new legislation dictates that the time change is to
1076# be done at 02:00 instead of 00:01.
1077# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1078# ...
1079# Manitoba has traditionally changed the clock every fall at 03:00.
1080# As of 2006, the transition is to take place one hour earlier at 02:00.
1081# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1082# ...
1083# [Alberta, Ontario, Quebec] will follow US rules.
1084# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1085# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1086# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1087# ...
1088# P.E.I. will follow US rules....
1089# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1090# ...
1091# Province of Newfoundland and Labrador....
1092# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1093# ...
1094# Yukon
1095# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1096# ...
1097# N.W.T. will follow US rules. Whoever maintains the government web site
1098# does not seem to believe in bookmarks. To see the news release, click the
1099# following link and search for "Daylight Savings Time Change". Press the
1100# "Daylight Savings Time Change" link; it will fire off a popup using
1101# JavaScript.
1102# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1103# ...
1104# Nunavut
1105# An amendment to the Interpretation Act was registered on February 19/2007....
1106# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1107
1108# From Paul Eggert (2006-04-25):
1109# H. David Matthews and Mary Vincent's map
1110# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1111# "It's about TIME", _Canadian Geographic_ (September-October 1998)
1112# </a> contains detailed boundaries for regions observing nonstandard
1113# time and daylight saving time arrangements in Canada circa 1998.
1114#
1115# INMS, the Institute for National Measurement Standards in Ottawa, has <a
1116# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1117# information about standard and daylight saving time zones in Canada.
1118# </a> (updated periodically).
1119# Its unofficial information is often taken from Matthews and Vincent.
1120
1121# From Paul Eggert (2006-06-27):
1122# For now, assume all of DST-observing Canada will fall into line with the
1123# new US DST rules,
1124
1125# From Chris Walton (2011-12-01)
1126# In the first of Tammy Hardwick's articles
1127# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1128# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1129# </a>
1130# she quotes the Friday November 1/1918 edition of the Creston Review.
1131# The quote includes these two statements:
1132# 'Sunday the CPR went back to the old system of time...'
1133# '... The daylight saving scheme was dropped all over Canada at the same time,'
1134# These statements refer to a transition from daylight time to standard time
1135# that occurred nationally on Sunday October 27/1918. This transition was
1136# also documented in the Saturday October 26/1918 edition of the Toronto Star.
1137
1138# In light of that evidence, we alter the date from the earlier believed
1139# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1140# than Thursday) in all Canadian rulesets.
1141
1142# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1143Rule Canada 1918 only - Apr 14 2:00 1:00 D
1144Rule Canada 1918 only - Oct 27 2:00 0 S
1145Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1146Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1147Rule Canada 1945 only - Sep 30 2:00 0 S
1148Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1149Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1150Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1151Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1152Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1153
1154
1155# Newfoundland and Labrador
1156
1157# From Paul Eggert (2000-10-02):
1158# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1159# but the only part of Labrador that follows the rules is the
1160# southeast corner, including Port Hope Simpson and Mary's Harbour,
1161# but excluding, say, Black Tickle.
1162
1163# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1164Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1165Rule StJohns 1917 only - Sep 17 2:00 0 S
1166# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1167Rule StJohns 1919 only - May 5 23:00 1:00 D
1168Rule StJohns 1919 only - Aug 12 23:00 0 S
1169# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1170Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1171Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1172# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1173# Pottenger.
1174Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1175Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1176# Whitman gives the following transitions:
1177# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1178# but go with Shanks & Pottenger and assume they used Canadian rules.
1179# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1180# Apr 30 - Sep 24; go with Shanks & Pottenger.
1181Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1182Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1183Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1184Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1185Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1186# From Paul Eggert (2000-10-02):
1187# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1188# at 00:01 local time. For now, assume it started in 1987.
1189
1190# From Michael Pelley (2011-09-12):
1191# We received today, Monday, September 12, 2011, notification that the
1192# changes to the Newfoundland Standard Time Act have been proclaimed.
1193# The change in the Act stipulates that the change from Daylight Savings
1194# Time to Standard Time and from Standard Time to Daylight Savings Time
1195# now occurs at 2:00AM.
1196# ...
1197# <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1198# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1199# </a>
1200# ...
1201# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1202# Office of the Chief Information Officer
1203# Executive Council
1204# Government of Newfoundland & Labrador
1205
1206Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1207Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1208Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1209Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1210Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1211Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1212#
1213# St John's has an apostrophe, but Posix file names can't have apostrophes.
1214# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1215Zone America/St_Johns -3:30:52 - LMT 1884
1216 -3:30:52 StJohns N%sT 1918
1217 -3:30:52 Canada N%sT 1919
1218 -3:30:52 StJohns N%sT 1935 Mar 30
1219 -3:30 StJohns N%sT 1942 May 11
1220 -3:30 Canada N%sT 1946
1221 -3:30 StJohns N%sT 2011 Nov
1222 -3:30 Canada N%sT
1223
1224# most of east Labrador
1225
1226# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1227# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1228Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1229 -3:30:52 - NST 1918
1230 -3:30:52 Canada N%sT 1919
1231 -3:30:52 - NST 1935 Mar 30
1232 -3:30 - NST 1936
1233 -3:30 StJohns N%sT 1942 May 11
1234 -3:30 Canada N%sT 1946
1235 -3:30 StJohns N%sT 1966 Mar 15 2:00
1236 -4:00 StJohns A%sT 2011 Nov
1237 -4:00 Canada A%sT
1238
1239
1240# west Labrador, Nova Scotia, Prince Edward I
1241
1242# From Paul Eggert (2006-03-22):
1243# Shanks & Pottenger write that since 1970 most of this region has been like
1244# Halifax. Many locales did not observe peacetime DST until 1972;
1245# Glace Bay, NS is the largest that we know of.
1246# Shanks & Pottenger also write that Liverpool, NS was the only town
1247# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1248# this is a typo.
1249
1250# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1251Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1252Rule Halifax 1916 only - Oct 1 0:00 0 S
1253Rule Halifax 1920 only - May 9 0:00 1:00 D
1254Rule Halifax 1920 only - Aug 29 0:00 0 S
1255Rule Halifax 1921 only - May 6 0:00 1:00 D
1256Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1257Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1258Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1259Rule Halifax 1923 only - Sep 4 0:00 0 S
1260Rule Halifax 1924 only - Sep 15 0:00 0 S
1261Rule Halifax 1925 only - Sep 28 0:00 0 S
1262Rule Halifax 1926 only - May 16 0:00 1:00 D
1263Rule Halifax 1926 only - Sep 13 0:00 0 S
1264Rule Halifax 1927 only - May 1 0:00 1:00 D
1265Rule Halifax 1927 only - Sep 26 0:00 0 S
1266Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1267Rule Halifax 1928 only - Sep 9 0:00 0 S
1268Rule Halifax 1929 only - Sep 3 0:00 0 S
1269Rule Halifax 1930 only - Sep 15 0:00 0 S
1270Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1271Rule Halifax 1932 only - May 1 0:00 1:00 D
1272Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1273Rule Halifax 1933 only - Oct 2 0:00 0 S
1274Rule Halifax 1934 only - May 20 0:00 1:00 D
1275Rule Halifax 1934 only - Sep 16 0:00 0 S
1276Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1277Rule Halifax 1935 only - Sep 30 0:00 0 S
1278Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1279Rule Halifax 1936 only - Sep 14 0:00 0 S
1280Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1281Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1282Rule Halifax 1939 only - May 28 0:00 1:00 D
1283Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1284Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1285Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1286Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1287Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1288Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1289Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1290Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1291Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1292# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1293Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1294 -4:00 Halifax A%sT 1918
1295 -4:00 Canada A%sT 1919
1296 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1297 -4:00 Canada A%sT 1946
1298 -4:00 Halifax A%sT 1974
1299 -4:00 Canada A%sT
1300Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1301 -4:00 Canada A%sT 1953
1302 -4:00 Halifax A%sT 1954
1303 -4:00 - AST 1972
1304 -4:00 Halifax A%sT 1974
1305 -4:00 Canada A%sT
1306
1307# New Brunswick
1308
1309# From Paul Eggert (2007-01-31):
1310# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1311# says they changed at 00:01 through 2006, and
1312# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1313# clear that this was the case since at least 1993.
1314# For now, assume it started in 1993.
1315
1316# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1317Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1318Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1319Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1320Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1321Rule Moncton 1939 only - May 27 1:00 1:00 D
1322Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1323Rule Moncton 1940 only - May 19 1:00 1:00 D
1324Rule Moncton 1941 only - May 4 1:00 1:00 D
1325Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1326Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1327Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1328Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1329Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1330# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1331Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1332 -5:00 - EST 1902 Jun 15
1333 -4:00 Canada A%sT 1933
1334 -4:00 Moncton A%sT 1942
1335 -4:00 Canada A%sT 1946
1336 -4:00 Moncton A%sT 1973
1337 -4:00 Canada A%sT 1993
1338 -4:00 Moncton A%sT 2007
1339 -4:00 Canada A%sT
1340
1341# Quebec
1342
1343# From Paul Eggert (2006-07-09):
1344# Shanks & Pottenger write that since 1970 most of Quebec has been
1345# like Montreal.
1346
1347# From Paul Eggert (2006-06-27):
1348# Matthews and Vincent (1998) also write that Quebec east of the -63
1349# meridian is supposed to observe AST, but residents as far east as
1350# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1351# In "Official time in Quebec" the Quebec department of justice writes in
1352# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1353# that "The residents of the Municipality of the
1354# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1355# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1356# written and use Atlantic standard time all year round. The same applies to
1357# the residents of the Native facilities along the lower North Shore."
1358# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1359# says this common practice was codified into law as of 2007.
1360# For lack of better info, guess this practice began around 1970, contra to
1361# Shanks & Pottenger who have this region observing AST/ADT.
1362
1363# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1364Rule Mont 1917 only - Mar 25 2:00 1:00 D
1365Rule Mont 1917 only - Apr 24 0:00 0 S
1366Rule Mont 1919 only - Mar 31 2:30 1:00 D
1367Rule Mont 1919 only - Oct 25 2:30 0 S
1368Rule Mont 1920 only - May 2 2:30 1:00 D
1369Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1370Rule Mont 1921 only - May 1 2:00 1:00 D
1371Rule Mont 1922 only - Apr 30 2:00 1:00 D
1372Rule Mont 1924 only - May 17 2:00 1:00 D
1373Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1374Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1375# The 1927-to-1937 rules can be expressed more simply as
1376# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1377# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1378# The rules below avoid use of 24:00
1379# (which pre-1998 versions of zic cannot handle).
1380Rule Mont 1927 only - May 1 0:00 1:00 D
1381Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1382Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1383Rule Mont 1932 only - May 1 0:00 1:00 D
1384Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1385Rule Mont 1933 only - Oct 1 0:00 0 S
1386Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1387Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1388Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1389Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1390Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1391Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1392
1393# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1394Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1395 -4:00 Canada A%sT 1970
1396 -4:00 - AST
1397Zone America/Montreal -4:54:16 - LMT 1884
1398 -5:00 Mont E%sT 1918
1399 -5:00 Canada E%sT 1919
1400 -5:00 Mont E%sT 1942 Feb 9 2:00s
1401 -5:00 Canada E%sT 1946
1402 -5:00 Mont E%sT 1974
1403 -5:00 Canada E%sT
1404
1405
1406# Ontario
1407
1408# From Paul Eggert (2006-07-09):
1409# Shanks & Pottenger write that since 1970 most of Ontario has been like
1410# Toronto.
1411# Thunder Bay skipped DST in 1973.
1412# Many smaller locales did not observe peacetime DST until 1974;
1413# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1414# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1415
1416# From Mark Brader (2003-07-26):
1417# [According to the Toronto Star] Orillia, Ontario, adopted DST
1418# effective Saturday, 1912-06-22, 22:00; the article mentions that
1419# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1420# have already done so. In Orillia DST was to run until Saturday,
1421# 1912-08-31 (no time mentioned), but it was met with considerable
1422# hostility from certain segments of the public, and was revoked after
1423# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1424# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1425# earlier in June).
1426#
1427# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1428
1429# From Paul Eggert (1997-10-17):
1430# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1431# says that Atikokan, Ontario currently does not observe DST,
1432# but will vote on 11-10 whether to use EST/EDT.
1433# He also writes that the
1434# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1435# Ontario Time Act (1990, Chapter T.9)
1436# </a>
1437# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1438# Officially Atikokan is therefore on CST/CDT, and most likely this report
1439# concerns a non-official time observed as a matter of local practice.
1440#
1441# From Paul Eggert (2000-10-02):
1442# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1443# New Osnaburgh observe CST all year, that Big Trout Lake observes
1444# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1445# violation of the official Ontario rules.
1446#
1447# From Paul Eggert (2006-07-09):
1448# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1449# 2005-07-21 Chronicle-Journal, which said:
1450#
1451# The clocks in Atikokan stay set on standard time year-round.
1452# This means they spend about half the time on central time and
1453# the other half on eastern time.
1454#
1455# For the most part, the system works, Mayor Dennis Brown said.
1456#
1457# "The majority of businesses in Atikokan deal more with Eastern
1458# Canada, but there are some that deal with Western Canada," he
1459# said. "I don't see any changes happening here."
1460#
1461# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1462# [New Osnaburgh] follow the same practice."
1463
1464# From Garry McKinnon (2006-07-14) via Chris Walton:
1465# I chatted with a member of my board who has an outstanding memory
1466# and a long history in Atikokan (and in the telecom industry) and he
1467# can say for certain that Atikokan has been practicing the current
1468# time keeping since 1952, at least.
1469
1470# From Paul Eggert (2006-07-17):
1471# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1472# ever since standard time was introduced, but the information from
1473# McKinnon sounds more authoritative. For now, assume that Atikokan
1474# switched to EST immediately after WWII era daylight saving time
1475# ended. This matches the old (less-populous) America/Coral_Harbour
1476# entry since our cutoff date of 1970, so we can move
1477# America/Coral_Harbour to the 'backward' file.
1478
1479# From Mark Brader (2010-03-06):
1480#
1481# Currently the database has:
1482#
1483# # Ontario
1484#
1485# # From Paul Eggert (2006-07-09):
1486# # Shanks & Pottenger write that since 1970 most of Ontario has been like
1487# # Toronto.
1488# # Thunder Bay skipped DST in 1973.
1489# # Many smaller locales did not observe peacetime DST until 1974;
1490# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1491#
1492# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1493# right corner of page 1, it says that Toronto will return to standard
1494# time at 2 am Sunday morning (which agrees with the database), and that:
1495#
1496# The one-hour setback will go into effect throughout most of Ontario,
1497# except in areas like Windsor which remains on standard time all year.
1498#
1499# Windsor is, of course, a lot larger than Nipigon.
1500#
1501# I only came across this incidentally. I don't know if Windsor began
1502# observing DST when Detroit did, or in 1974, or on some other date.
1503#
1504# By the way, the article continues by noting that:
1505#
1506# Some cities in the United States have pushed the deadline back
1507# three weeks and will change over from daylight saving in October.
1508
1509# From Arthur David Olson (2010-07-17):
1510#
1511# "Standard Time and Time Zones in Canada" appeared in
1512# The Journal of The Royal Astronomical Society of Canada,
1513# volume 26, number 2 (February 1932) and, as of 2010-07-17,
1514# was available at
1515# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1516# http://adsabs.harvard.edu/full/1932JRASC..26...49S
1517# </a>
1518#
1519# It includes the text below (starting on page 57):
1520#
1521# A list of the places in Canada using daylight saving time would
1522# require yearly revision. From information kindly furnished by
1523# the provincial governments and by the postmasters in many cities
1524# and towns, it is found that the following places used daylight sav-
1525# ing in 1930. The information for the province of Quebec is definite,
1526# for the other provinces only approximate:
1527#
1528# Province Daylight saving time used
1529# Prince Edward Island Not used.
1530# Nova Scotia In Halifax only.
1531# New Brunswick In St. John only.
1532# Quebec In the following places:
1533# Montreal Lachine
1534# Quebec Mont-Royal
1535# Levis Iberville
1536# St. Lambert Cap de la Madeleine
1537# Verdun Loretteville
1538# Westmount Richmond
1539# Outremont St. Jerome
1540# Longueuil Greenfield Park
1541# Arvida Waterloo
1542# Chambly-Canton Beaulieu
1543# Melbourne La Tuque
1544# St. Theophile Buckingham
1545# Ontario Used generally in the cities and towns along
1546# the southerly part of the province. Not
1547# used in the northwesterlhy part.
1548# Manitoba Not used.
1549# Saskatchewan In Regina only.
1550# Alberta Not used.
1551# British Columbia Not used.
1552#
1553# With some exceptions, the use of daylight saving may be said to be limited
1554# to those cities and towns lying between Quebec city and Windsor, Ont.
1555
1556# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1557Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1558Rule Toronto 1919 only - Oct 26 0:00 0 S
1559Rule Toronto 1920 only - May 2 2:00 1:00 D
1560Rule Toronto 1920 only - Sep 26 0:00 0 S
1561Rule Toronto 1921 only - May 15 2:00 1:00 D
1562Rule Toronto 1921 only - Sep 15 2:00 0 S
1563Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1564# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1565# was meant.
1566Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1567Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1568# The 1927-to-1939 rules can be expressed more simply as
1569# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1570# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1571# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1572# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1573# The rules below avoid use of Sun>=25
1574# (which pre-2004 versions of zic cannot handle).
1575Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1576Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1577Rule Toronto 1932 only - May 1 2:00 1:00 D
1578Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1579Rule Toronto 1933 only - Oct 1 2:00 0 S
1580Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1581Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1582Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1583Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1584Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1585Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1586Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1587Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1588Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1589# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1590# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1591# is wrong, and that he had confirmed it by checking the 1971-10-30
1592# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1593Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1594
1595# From Paul Eggert (2003-07-27):
1596# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1597# Port Arthur, Ontario, the principle of the Bill has been in
1598# operation for the past three years, and in the City of Moose Jaw,
1599# Saskatchewan, for one year."
1600
1601# From David Bryan via Tory Tronrud, Director/Curator,
1602# Thunder Bay Museum (2003-11-12):
1603# There is some suggestion, however, that, by-law or not, daylight
1604# savings time was being practiced in Fort William and Port Arthur
1605# before 1909.... [I]n 1910, the line between the Eastern and Central
1606# Time Zones was permanently moved about two hundred miles west to
1607# include the Thunder Bay area.... When Canada adopted daylight
1608# savings time in 1916, Fort William and Port Arthur, having done so
1609# already, did not change their clocks.... During the Second World
1610# War,... [t]he cities agreed to implement DST during the summer
1611# months for the remainder of the war years.
1612
1613# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1614Zone America/Toronto -5:17:32 - LMT 1895
1615 -5:00 Canada E%sT 1919
1616 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1617 -5:00 Canada E%sT 1946
1618 -5:00 Toronto E%sT 1974
1619 -5:00 Canada E%sT
1620Zone America/Thunder_Bay -5:57:00 - LMT 1895
1621 -6:00 - CST 1910
1622 -5:00 - EST 1942
1623 -5:00 Canada E%sT 1970
1624 -5:00 Mont E%sT 1973
1625 -5:00 - EST 1974
1626 -5:00 Canada E%sT
1627Zone America/Nipigon -5:53:04 - LMT 1895
1628 -5:00 Canada E%sT 1940 Sep 29
1629 -5:00 1:00 EDT 1942 Feb 9 2:00s
1630 -5:00 Canada E%sT
1631Zone America/Rainy_River -6:18:16 - LMT 1895
1632 -6:00 Canada C%sT 1940 Sep 29
1633 -6:00 1:00 CDT 1942 Feb 9 2:00s
1634 -6:00 Canada C%sT
1635Zone America/Atikokan -6:06:28 - LMT 1895
1636 -6:00 Canada C%sT 1940 Sep 29
1637 -6:00 1:00 CDT 1942 Feb 9 2:00s
1638 -6:00 Canada C%sT 1945 Sep 30 2:00
1639 -5:00 - EST
1640
1641
1642# Manitoba
1643
1644# From Rob Douglas (2006-04-06):
1645# the old Manitoba Time Act - as amended by Bill 2, assented to
1646# March 27, 1987 ... said ...
1647# "between two o'clock Central Standard Time in the morning of
1648# the first Sunday of April of each year and two o'clock Central
1649# Standard Time in the morning of the last Sunday of October next
1650# following, one hour in advance of Central Standard Time."...
1651# I believe that the English legislation [of the old time act] had =
1652# been assented to (March 22, 1967)....
1653# Also, as far as I can tell, there was no order-in-council varying
1654# the time of Daylight Saving Time for 2005 and so the provisions of
1655# the 1987 version would apply - the changeover was at 2:00 Central
1656# Standard Time (i.e. not until 3:00 Central Daylight Time).
1657
1658# From Paul Eggert (2006-04-10):
1659# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1660# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1661# it was also 02:00s in 1966.
1662
1663# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1664Rule Winn 1916 only - Apr 23 0:00 1:00 D
1665Rule Winn 1916 only - Sep 17 0:00 0 S
1666Rule Winn 1918 only - Apr 14 2:00 1:00 D
1667Rule Winn 1918 only - Oct 27 2:00 0 S
1668Rule Winn 1937 only - May 16 2:00 1:00 D
1669Rule Winn 1937 only - Sep 26 2:00 0 S
1670Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1671Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1672Rule Winn 1945 only - Sep lastSun 2:00 0 S
1673Rule Winn 1946 only - May 12 2:00 1:00 D
1674Rule Winn 1946 only - Oct 13 2:00 0 S
1675Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1676Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1677Rule Winn 1950 only - May 1 2:00 1:00 D
1678Rule Winn 1950 only - Sep 30 2:00 0 S
1679Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1680Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1681Rule Winn 1959 only - Oct lastSun 2:00 0 S
1682Rule Winn 1960 only - Sep lastSun 2:00 0 S
1683Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1684Rule Winn 1963 only - Sep 22 2:00 0 S
1685Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1686Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1687Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1688# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1689Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1690 -6:00 Winn C%sT 2006
1691 -6:00 Canada C%sT
1692
1693
1694# Saskatchewan
1695
1696# From Mark Brader (2003-07-26):
1697# The first actual adoption of DST in Canada was at the municipal
1698# level. As the [Toronto] Star put it (1912-06-07), "While people
1699# elsewhere have long been talking of legislation to save daylight,
1700# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1701# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1702# presumably late evening, as below), and would run until "the end of
1703# the summer". The discrepancy between municipal time and railroad
1704# time was noted.
1705
1706# From Paul Eggert (2003-07-27):
1707# Willett (1914-03) notes that DST "has been in operation ... in the
1708# City of Moose Jaw, Saskatchewan, for one year."
1709
1710# From Paul Eggert (2006-03-22):
1711# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1712# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1713# Other western towns (e.g. Lloydminster) are like Edmonton.
1714# Matthews and Vincent (1998) write that Denare Beach and Creighton
1715# are like Winnipeg, in violation of Saskatchewan law.
1716
1717# From W. Jones (1992-11-06):
1718# The. . .below is based on information I got from our law library, the
1719# provincial archives, and the provincial Community Services department.
1720# A precise history would require digging through newspaper archives, and
1721# since you didn't say what you wanted, I didn't bother.
1722#
1723# Saskatchewan is split by a time zone meridian (105W) and over the years
1724# the boundary became pretty ragged as communities near it reevaluated
1725# their affiliations in one direction or the other. In 1965 a provincial
1726# referendum favoured legislating common time practices.
1727#
1728# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1729# Saskatchewan 1978) was proclaimed, and established that the eastern
1730# part of Saskatchewan would use CST year round, that districts in
1731# northwest Saskatchewan would by default follow CST but could opt to
1732# follow Mountain Time rules (thus 1 hour difference in the winter and
1733# zero in the summer), and that districts in southwest Saskatchewan would
1734# by default follow MT but could opt to follow CST.
1735#
1736# It took a few years for the dust to settle (I know one story of a town
1737# on one time zone having its school in another, such that a mom had to
1738# serve her family lunch in two shifts), but presently it seems that only
1739# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1740# rules any more; all other districts appear to have used CST year round
1741# since sometime in the 1960s.
1742
1743# From Chris Walton (2006-06-26):
1744# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1745# long and rather painful to read.
1746# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1747
1748# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1749Rule Regina 1918 only - Apr 14 2:00 1:00 D
1750Rule Regina 1918 only - Oct 27 2:00 0 S
1751Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1752Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1753Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1754Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1755Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1756Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1757Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1758Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1759Rule Regina 1945 only - Sep lastSun 2:00 0 S
1760Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1761Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1762Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1763Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1764Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1765Rule Regina 1959 only - Oct lastSun 2:00 0 S
1766#
1767Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1768Rule Swift 1957 only - Oct lastSun 2:00 0 S
1769Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1770Rule Swift 1959 only - Oct lastSun 2:00 0 S
1771Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1772# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1773Zone America/Regina -6:58:36 - LMT 1905 Sep
1774 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1775 -6:00 - CST
1776Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1777 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1778 -7:00 Regina M%sT 1950
1779 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1780 -6:00 - CST
1781
1782
1783# Alberta
1784
1785# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1786Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1787Rule Edm 1918 only - Oct 27 2:00 0 S
1788Rule Edm 1919 only - May 27 2:00 0 S
1789Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1790Rule Edm 1920 only - Oct lastSun 2:00 0 S
1791Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1792Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1793Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1794Rule Edm 1945 only - Sep lastSun 2:00 0 S
1795Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1796Rule Edm 1947 only - Sep lastSun 2:00 0 S
1797Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1798Rule Edm 1967 only - Oct lastSun 2:00 0 S
1799Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1800Rule Edm 1969 only - Oct lastSun 2:00 0 S
1801Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1802Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1803# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1804Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1805 -7:00 Edm M%sT 1987
1806 -7:00 Canada M%sT
1807
1808
1809# British Columbia
1810
1811# From Paul Eggert (2006-03-22):
1812# Shanks & Pottenger write that since 1970 most of this region has
1813# been like Vancouver.
1814# Dawson Creek uses MST. Much of east BC is like Edmonton.
1815# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1816
1817# It seems though that (re: Creston) is not entirely correct:
1818
1819# From Chris Walton (2011-12-01):
1820# There are two areas within the Canadian province of British Columbia
1821# that do not currently observe daylight saving:
1822# a) The Creston Valley (includes the town of Creston and surrounding area)
1823# b) The eastern half of the Peace River Regional District
1824# (includes the cities of Dawson Creek and Fort St. John)
1825
1826# Earlier this year I stumbled across a detailed article about the time
1827# keeping history of Creston; it was written by Tammy Hardwick who is the
1828# manager of the Creston & District Museum. The article was written in May 2009.
1829# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1830# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1831# </a>
1832# According to the article, Creston has not changed its clocks since June 1918.
1833# i.e. Creston has been stuck on UTC-7 for 93 years.
1834# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1835
1836# Unfortunately the exact date for the time change in June 1918 remains
1837# unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1838# ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1839# as plausible as any other date (in June). She also said that after writing the
1840# article she had discovered another time change in 1916; this is the subject
1841# of another article which she wrote in October 2010.
1842# <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1843# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1844# </a>
1845
1846# Here is a summary of the three clock change events in Creston's history:
1847# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1848# Exact date unknown
1849# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1850# Exact date in October unknown; Sunday October 1 is a reasonable guess.
1851# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1852# Exact date in June unknown; Sunday June 2 is a reasonable guess.
1853# note#1:
1854# On Oct 27/1918 when daylight saving ended in the rest of Canada,
1855# Creston did not change its clocks.
1856# note#2:
1857# During WWII when the Federal Government legislated a mandatory clock change,
1858# Creston did not oblige.
1859# note#3:
1860# There is no guarantee that Creston will remain on Mountain Standard Time
1861# (UTC-7) forever.
1862# The subject was debated at least once this year by the town Council.
1863# <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1864# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1865# </a>
1866
1867# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1868# In Creston, that was handled by shifting the area to PST (-8:00) then applying
1869# summer time to cause the offset to be -7:00, the same as it had been before
1870# the change. It can be argued that the timezone abbreviation during this
1871# period should be PDT rather than MST, but that doesn't seem important enough
1872# (to anyone) to further complicate the rules.
1873
1874# The transition dates (and times) are guesses.
1875
1876# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1877Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1878Rule Vanc 1918 only - Oct 27 2:00 0 S
1879Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1880Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1881Rule Vanc 1945 only - Sep 30 2:00 0 S
1882Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1883Rule Vanc 1946 only - Oct 13 2:00 0 S
1884Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1885Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1886# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1887Zone America/Vancouver -8:12:28 - LMT 1884
1888 -8:00 Vanc P%sT 1987
1889 -8:00 Canada P%sT
1890Zone America/Dawson_Creek -8:00:56 - LMT 1884
1891 -8:00 Canada P%sT 1947
1892 -8:00 Vanc P%sT 1972 Aug 30 2:00
1893 -7:00 - MST
1894Zone America/Creston -7:46:04 - LMT 1884
1895 -7:00 - MST 1916 Oct 1
1896 -8:00 - PST 1918 Jun 2
1897 -7:00 - MST
1898
1899# Northwest Territories, Nunavut, Yukon
1900
1901# From Paul Eggert (2006-03-22):
1902# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1903# Mathew Englander (1996-10-07) gives the following refs:
1904# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1905# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1906# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1907# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1908# * O.I.C. 1980/02 established DST.
1909# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1910# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1911# with Englander.
1912# From Chris Walton (2006-06-26):
1913# Here is a link to the old daylight saving portion of the interpretation
1914# act which was last updated in 1987:
1915# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1916
1917# From Rives McDow (1999-09-04):
1918# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1919# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1920# Nunavut moves to single time zone Oct. 31
1921# </a>
1922#
1923# From Antoine Leca (1999-09-06):
1924# We then need to create a new timezone for the Kitikmeot region of Nunavut
1925# to differentiate it from the Yellowknife region.
1926
1927# From Paul Eggert (1999-09-20):
1928# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1929# Basic Facts: The New Territory
1930# </a> (1999) reports that Pangnirtung operates on eastern time,
1931# and that Coral Harbour does not observe DST. We don't know when
1932# Pangnirtung switched to eastern time; we'll guess 1995.
1933
1934# From Rives McDow (1999-11-08):
1935# On October 31, when the rest of Nunavut went to Central time,
1936# Pangnirtung wobbled. Here is the result of their wobble:
1937#
1938# The following businesses and organizations in Pangnirtung use Central Time:
1939#
1940# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1941# Eastern Arctic National Parks, A & D Specialist
1942#
1943# The following businesses and organizations in Pangnirtung use Eastern Time:
1944#
1945# Hamlet office, All other businesses, Both schools, Airport operator
1946#
1947# This has made for an interesting situation there, which warranted the news.
1948# No one there that I spoke with seems concerned, or has plans to
1949# change the local methods of keeping time, as it evidently does not
1950# really interfere with any activities or make things difficult locally.
1951# They plan to celebrate New Year's turn-over twice, one hour apart,
1952# so it appears that the situation will last at least that long.
1953# The Nunavut Intergovernmental Affairs hopes that they will "come to
1954# their senses", but the locals evidently don't see any problem with
1955# the current state of affairs.
1956
1957# From Michaela Rodrigue, writing in the
1958# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1959# Nunatsiaq News (1999-11-19)</a>:
1960# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1961# central - or Nunavut time - for government offices, and eastern time
1962# for municipal offices and schools.... Igloolik [was similar but then]
1963# made the switch to central time on Saturday, Nov. 6.
1964
1965# From Paul Eggert (2000-10-02):
1966# Matthews and Vincent (1998) say the following, but we lack histories
1967# for these potential new Zones.
1968#
1969# The Canadian Forces station at Alert uses Eastern Time while the
1970# handful of residents at the Eureka weather station [in the Central
1971# zone] skip daylight savings. Baffin Island, which is crossed by the
1972# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1973# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1974# Central Time and Southampton Island [in the Central zone] is not
1975# required to use daylight savings.
1976
1977# From
1978# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1979# Nunavut now has two time zones
1980# </a> (2000-11-10):
1981# The Nunavut government would allow its employees in Kugluktuk and
1982# Cambridge Bay to operate on central time year-round, putting them
1983# one hour behind the rest of Nunavut for six months during the winter.
1984# At the end of October the two communities had rebelled against
1985# Nunavut's unified time zone, refusing to shift to eastern time with
1986# the rest of the territory for the winter. Cambridge Bay remained on
1987# central time, while Kugluktuk, even farther west, reverted to
1988# mountain time, which they had used before the advent of Nunavut's
1989# unified time zone in 1999.
1990#
1991# From Rives McDow (2001-01-20), quoting the Nunavut government:
1992# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1993
1994# From Paul Eggert (2000-12-04):
1995# Let's just keep track of the official times for now.
1996
1997# From Rives McDow (2001-03-07):
1998# The premier of Nunavut has issued a ministerial statement advising
1999# that effective 2001-04-01, the territory of Nunavut will revert
2000# back to three time zones (mountain, central, and eastern). Of the
2001# cities in Nunavut, Coral Harbor is the only one that I know of that
2002# has said it will not observe dst, staying on EST year round. I'm
2003# checking for more info, and will get back to you if I come up with
2004# more.
2005# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2006
2007# From Gwillim Law (2005-05-21):
2008# According to maps at
2009# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2010# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2011# (both dated 2003), and
2012# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2013# (from a 1998 Canadian Geographic article), the de facto and de jure time
2014# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2015# round. Using Google, it's easy to find other websites that confirm this.
2016# I wasn't able to find how far back this time regimen goes, but since it
2017# predates the creation of Nunavut, it probably goes back many years....
2018# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2019#
2020# From Paul Eggert (2005-07-26):
2021# For lack of better information, assume that Southampton Island observed
2022# daylight saving only during wartime.
2023
2024# From Chris Walton (2007-03-01):
2025# ... the community of Resolute (located on Cornwallis Island in
2026# Nunavut) moved from Central Time to Eastern Time last November.
2027# Basically the community did not change its clocks at the end of
2028# daylight saving....
2029# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2030
2031# From Chris Walton (2011-03-21):
2032# Back in 2007 I initiated the creation of a new "zone file" for Resolute
2033# Bay. Resolute Bay is a small community located about 900km north of
2034# the Arctic Circle. The zone file was required because Resolute Bay had
2035# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2036#
2037# According to new information which I received last week, Resolute Bay
2038# went back to using UTC-6 in the winter of 2007-2008...
2039#
2040# On March 11/2007 most of Canada went onto daylight saving. On March
2041# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2042# talked to somebody that was both knowledgeable and helpful. I was able
2043# to confirm that Resolute Bay was still operating on UTC-5. It was
2044# explained to me that Resolute Bay had been on the Eastern Time zone
2045# (EST) in the winter, and was now back on the Central Time zone (CDT).
2046# i.e. the time zone had changed twice in the last year but the clocks
2047# had not moved. The residents had to know which time zone they were in
2048# so they could follow the correct TV schedule...
2049#
2050# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2051# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2052# of the phone call, I decided to seek out an alternate source of
2053# information. I found an e-mail address for somebody by the name of
2054# Stephanie Adams whose job was listed as "Inns North Support Officer for
2055# Arctic Co-operatives." I was under the impression that Stephanie lived
2056# and worked in Resolute Bay...
2057#
2058# On March 14/2011 I phoned the hamlet office again. I was told that
2059# Resolute Bay had been using Central Standard Time over the winter of
2060# 2010-2011 and that the clocks had therefore been moved one hour ahead
2061# on March 13/2011. The person I talked to was aware that Resolute Bay
2062# had previously experimented with Eastern Standard Time but he could not
2063# tell me when the practice had stopped.
2064#
2065# On March 17/2011 I searched the Web to find an e-mail address of
2066# somebody that might be able to tell me exactly when Resolute Bay went
2067# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2068# used to be the mayor of Resolute Bay and he apparently owns half the
2069# businesses including "South Camp Inn." This website has some info on
2070# Aziz:
2071# <a href="http://www.uphere.ca/node/493">
2072# http://www.uphere.ca/node/493
2073# </a>
2074#
2075# I sent Aziz an e-mail asking when Resolute Bay had stopped using
2076# Eastern Standard Time.
2077#
2078# Aziz responded quickly with this: "hi, The time was not changed for the
2079# 1 year only, the following year, the community went back to the old way
2080# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2081# the winter Zulu plus 6 hrs"
2082#
2083# This of course conflicted with everything I had ascertained in November 2008.
2084#
2085# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2086# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2087# may want to check with the weather office in Resolute Bay or do a
2088# search on the weather through Env. Canada. web site"
2089#
2090# If I had realized the Stephanie did not live in Resolute Bay I would
2091# never have contacted her. I now believe that all the information I
2092# obtained in November 2008 should be ignored...
2093# I apologize for reporting incorrect information in 2008.
2094
2095# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2096Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2097Rule NT_YK 1918 only - Oct 27 2:00 0 S
2098Rule NT_YK 1919 only - May 25 2:00 1:00 D
2099Rule NT_YK 1919 only - Nov 1 0:00 0 S
2100Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2101Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2102Rule NT_YK 1945 only - Sep 30 2:00 0 S
2103Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2104Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2105Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2106Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2107Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2108# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2109# aka Panniqtuuq
2110Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2111 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2112 -5:00 Canada E%sT 1999 Oct 31 2:00
2113 -6:00 Canada C%sT 2000 Oct 29 2:00
2114 -5:00 Canada E%sT
2115# formerly Frobisher Bay
2116Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2117 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2118 -6:00 Canada C%sT 2000 Oct 29 2:00
2119 -5:00 Canada E%sT
2120# aka Qausuittuq
2121Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2122 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2123 -5:00 - EST 2001 Apr 1 3:00
2124 -6:00 Canada C%sT 2006 Oct 29 2:00
2125 -5:00 - EST 2007 Mar 11 3:00
2126 -6:00 Canada C%sT
2127# aka Kangiqiniq
2128Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2129 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2130 -5:00 - EST 2001 Apr 1 3:00
2131 -6:00 Canada C%sT
2132# aka Iqaluktuuttiaq
2133Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2134 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2135 -6:00 Canada C%sT 2000 Oct 29 2:00
2136 -5:00 - EST 2000 Nov 5 0:00
2137 -6:00 - CST 2001 Apr 1 3:00
2138 -7:00 Canada M%sT
2139Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2140 -7:00 NT_YK M%sT 1980
2141 -7:00 Canada M%sT
2142Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2143 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2144 -7:00 NT_YK M%sT 1980
2145 -7:00 Canada M%sT
2146Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2147 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2148 -8:00 NT_YK P%sT 1980
2149 -8:00 Canada P%sT
2150Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2151 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2152 -8:00 NT_YK P%sT 1980
2153 -8:00 Canada P%sT
2154
2155
2156###############################################################################
2157
2158# Mexico
2159
2160# From Paul Eggert (2001-03-05):
2161# The Investigation and Analysis Service of the
2162# Mexican Library of Congress (MLoC) has published a
2163# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2164# history of Mexican local time (in Spanish)
2165# </a>.
2166#
2167# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2168# (In all cases we go with the MLoC.)
2169# S&P report that Baja was at -8:00 in 1922/1923.
2170# S&P say the 1930 transition in Baja was 1930-11-16.
2171# S&P report no DST during summer 1931.
2172# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2173
2174# From Gwillim Law (2001-02-20):
2175# There are some other discrepancies between the Decrees page and the
2176# tz database. I think they can best be explained by supposing that
2177# the researchers who prepared the Decrees page failed to find some of
2178# the relevant documents.
2179
2180# From Alan Perry (1996-02-15):
2181# A guy from our Mexico subsidiary finally found the Presidential Decree
2182# outlining the timezone changes in Mexico.
2183#
2184# ------------- Begin Forwarded Message -------------
2185#
2186# I finally got my hands on the Official Presidential Decree that sets up the
2187# rules for the DST changes. The rules are:
2188#
2189# 1. The country is divided in 3 timezones:
2190# - Baja California Norte (the Mexico/BajaNorte TZ)
2191# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2192# - The rest of the country (the Mexico/General TZ)
2193#
2194# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2195# at 2:00 AM, the times in each zone are as follows:
2196# BajaNorte: GMT+7
2197# BajaSur: GMT+6
2198# General: GMT+5
2199#
2200# 3. The rest of the year, the times are as follows:
2201# BajaNorte: GMT+8
2202# BajaSur: GMT+7
2203# General: GMT+6
2204#
2205# The Decree was published in Mexico's Official Newspaper on January 4th.
2206#
2207# -------------- End Forwarded Message --------------
2208# From Paul Eggert (1996-06-12):
2209# For an English translation of the decree, see
2210# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2211# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
2212# </a>
2213
2214# From Rives McDow (1998-10-08):
2215# The State of Quintana Roo has reverted back to central STD and DST times
2216# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2217
2218# From Rives McDow (2000-01-10):
2219# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2220# zone 5 hours from the International Date Line, and will not observe daylight
2221# savings time so as to stay on the same time zone as the southern part of
2222# Arizona year round.
2223
2224# From Jesper Norgaard, translating
2225# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2226# In Oaxaca, the 55.000 teachers from the Section 22 of the National
2227# Syndicate of Education Workers, refuse to apply daylight saving each
2228# year, so that the more than 10,000 schools work at normal hour the
2229# whole year.
2230
2231# From Gwillim Law (2001-01-19):
2232# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2233# (translated):...
2234# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2235# that Summer Time will be reduced from seven to five months, starting
2236# this year....
2237# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2238# [translated], says "summer time will ... take effect on the first Sunday
2239# in May, and end on the last Sunday of September.
2240
2241# From Arthur David Olson (2001-01-25):
2242# The 2001-01-24 traditional Washington Post contained the page one
2243# story "Timely Issue Divides Mexicans."...
2244# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2245# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2246# Mexico City and its 20 million residents on a different time than
2247# the rest of the country..." In particular, Lopez Obrador would abolish
2248# observation of Daylight Saving Time.
2249
2250# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2251# Official statute published by the Energy Department
2252# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2253# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2254
2255# From Paul Eggert (2001-03-03):
2256#
2257# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2258# James F. Smith writes in today's LA Times
2259# </a>
2260# * Sonora will continue to observe standard time.
2261# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2262# the Federal District will not adopt DST.
2263# * 4 of 16 district leaders announced they'll ignore the decree.
2264# * The decree does not affect federal-controlled facilities including
2265# the airport, banks, hospitals, and schools.
2266#
2267# For now we'll assume that the Federal District will bow to federal rules.
2268
2269# From Jesper Norgaard (2001-04-01):
2270# I found some references to the Mexican application of daylight
2271# saving, which modifies what I had already sent you, stating earlier
2272# that a number of northern Mexican states would go on daylight
2273# saving. The modification reverts this to only cover Baja California
2274# (Norte), while all other states (except Sonora, who has no daylight
2275# saving all year) will follow the original decree of president
2276# Vicente Fox, starting daylight saving May 6, 2001 and ending
2277# September 30, 2001.
2278# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2279# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2280
2281# From Reuters (2001-09-04):
2282# Mexico's Supreme Court on Tuesday declared that daylight savings was
2283# unconstitutional in Mexico City, creating the possibility the
2284# capital will be in a different time zone from the rest of the nation
2285# next year.... The Supreme Court's ruling takes effect at 2:00
2286# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2287# standard time. "This is so residents of the Federal District are not
2288# subject to unexpected time changes," a statement from the court said.
2289
2290# From Jesper Norgaard Welen (2002-03-12):
2291# ... consulting my local grocery store(!) and my coworkers, they all insisted
2292# that a new decision had been made to reinstate US style DST in Mexico....
2293# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2294# confirms this. Sonora as usual is the only state where DST is not applied.
2295
2296# From Steffen Thorsen (2009-12-28):
2297#
2298# Steffen Thorsen wrote:
2299# > Mexico's House of Representatives has approved a proposal for northern
2300# > Mexico's border cities to share the same daylight saving schedule as
2301# > the United States.
2302# Now this has passed both the Congress and the Senate, so starting from
2303# 2010, some border regions will be the same:
2304# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2305# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2306# </a>
2307# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2308# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2309# </a>
2310# (Spanish)
2311#
2312# Could not find the new law text, but the proposed law text changes are here:
2313# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2314# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2315# </a>
2316# (Gaceta Parlamentaria)
2317#
2318# There is also a list of the votes here:
2319# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2320# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2321# </a>
2322#
2323# Our page:
2324# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2325# http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2326# </a>
2327
2328# From Arthur David Olson (2010-01-20):
2329# The page
2330# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2331# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2332# </a>
2333# includes this text:
2334# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2335# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2336# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2337# Tamaulipas, la aplicación de este horario estacional surtirá efecto
2338# desde las dos horas del segundo domingo de marzo y concluirá a las dos
2339# horas del primer domingo de noviembre.
2340# En los municipios fronterizos que se encuentren ubicados en la franja
2341# fronteriza norte en el territorio comprendido entre la línea
2342# internacional y la línea paralela ubicada a una distancia de veinte
2343# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2344# interior del país, la aplicación de este horario estacional surtirá
2345# efecto desde las dos horas del segundo domingo de marzo y concluirá a
2346# las dos horas del primer domingo de noviembre.
2347
2348# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2349Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2350Rule Mexico 1939 only - Jun 25 0:00 0 S
2351Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2352Rule Mexico 1941 only - Apr 1 0:00 0 S
2353Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2354Rule Mexico 1944 only - May 1 0:00 0 S
2355Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2356Rule Mexico 1950 only - Jul 30 0:00 0 S
2357Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2358Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2359Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2360Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2361Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2362Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2363# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2364# Quintana Roo
2365Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2366 -6:00 - CST 1981 Dec 23
2367 -5:00 Mexico E%sT 1998 Aug 2 2:00
2368 -6:00 Mexico C%sT
2369# Campeche, Yucatan
2370Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2371 -6:00 - CST 1981 Dec 23
2372 -5:00 - EST 1982 Dec 2
2373 -6:00 Mexico C%sT
2374# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2375Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2376 -6:00 - CST 1988
2377 -6:00 US C%sT 1989
2378 -6:00 Mexico C%sT 2010
2379 -6:00 US C%sT
2380# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2381Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2382 -6:00 - CST 1988
2383 -6:00 US C%sT 1989
2384 -6:00 Mexico C%sT
2385# Central Mexico
2386Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2387 -7:00 - MST 1927 Jun 10 23:00
2388 -6:00 - CST 1930 Nov 15
2389 -7:00 - MST 1931 May 1 23:00
2390 -6:00 - CST 1931 Oct
2391 -7:00 - MST 1932 Apr 1
2392 -6:00 Mexico C%sT 2001 Sep 30 02:00
2393 -6:00 - CST 2002 Feb 20
2394 -6:00 Mexico C%sT
2395# Chihuahua (near US border)
2396Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2397 -7:00 - MST 1927 Jun 10 23:00
2398 -6:00 - CST 1930 Nov 15
2399 -7:00 - MST 1931 May 1 23:00
2400 -6:00 - CST 1931 Oct
2401 -7:00 - MST 1932 Apr 1
2402 -6:00 - CST 1996
2403 -6:00 Mexico C%sT 1998
2404 -6:00 - CST 1998 Apr Sun>=1 3:00
2405 -7:00 Mexico M%sT 2010
2406 -7:00 US M%sT
2407# Chihuahua (away from US border)
2408Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2409 -7:00 - MST 1927 Jun 10 23:00
2410 -6:00 - CST 1930 Nov 15
2411 -7:00 - MST 1931 May 1 23:00
2412 -6:00 - CST 1931 Oct
2413 -7:00 - MST 1932 Apr 1
2414 -6:00 - CST 1996
2415 -6:00 Mexico C%sT 1998
2416 -6:00 - CST 1998 Apr Sun>=1 3:00
2417 -7:00 Mexico M%sT
2418# Sonora
2419Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2420 -7:00 - MST 1927 Jun 10 23:00
2421 -6:00 - CST 1930 Nov 15
2422 -7:00 - MST 1931 May 1 23:00
2423 -6:00 - CST 1931 Oct
2424 -7:00 - MST 1932 Apr 1
2425 -6:00 - CST 1942 Apr 24
2426 -7:00 - MST 1949 Jan 14
2427 -8:00 - PST 1970
2428 -7:00 Mexico M%sT 1999
2429 -7:00 - MST
2430
2431# From Alexander Krivenyshev (2010-04-21):
2432# According to news, Bahía de Banderas (Mexican state of Nayarit)
2433# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2434# share the same time zone as nearby city Puerto Vallarta, Jalisco).
2435#
2436# (Spanish)
2437# Bahía de Banderas homologa su horario al del centro del
2438# país, a partir de este domingo
2439# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2440# http://www.nayarit.gob.mx/notes.asp?id=20748
2441# </a>
2442#
2443# Bahía de Banderas homologa su horario con el del Centro del
2444# País
2445# <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50">
2446# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50"
2447# </a>
2448#
2449# (English)
2450# Puerto Vallarta and Bahía de Banderas: One Time Zone
2451# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2452# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2453# </a>
2454#
2455# or
2456# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2457# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2458# </a>
2459#
2460# "Mexico's Senate approved the amendments to the Mexican Schedule System that
2461# will allow Bahía de Banderas and Puerto Vallarta to share the same time
2462# zone ..."
2463# Baja California Sur, Nayarit, Sinaloa
2464
2465# From Arthur David Olson (2010-05-01):
2466# Use "Bahia_Banderas" to keep the name to fourteen characters.
2467
2468Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2469 -7:00 - MST 1927 Jun 10 23:00
2470 -6:00 - CST 1930 Nov 15
2471 -7:00 - MST 1931 May 1 23:00
2472 -6:00 - CST 1931 Oct
2473 -7:00 - MST 1932 Apr 1
2474 -6:00 - CST 1942 Apr 24
2475 -7:00 - MST 1949 Jan 14
2476 -8:00 - PST 1970
2477 -7:00 Mexico M%sT
2478
2479Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2480 -7:00 - MST 1927 Jun 10 23:00
2481 -6:00 - CST 1930 Nov 15
2482 -7:00 - MST 1931 May 1 23:00
2483 -6:00 - CST 1931 Oct
2484 -7:00 - MST 1932 Apr 1
2485 -6:00 - CST 1942 Apr 24
2486 -7:00 - MST 1949 Jan 14
2487 -8:00 - PST 1970
2488 -7:00 Mexico M%sT 2010 Apr 4 2:00
2489 -6:00 Mexico C%sT
2490
2491# Baja California (near US border)
2492Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2493 -7:00 - MST 1924
2494 -8:00 - PST 1927 Jun 10 23:00
2495 -7:00 - MST 1930 Nov 15
2496 -8:00 - PST 1931 Apr 1
2497 -8:00 1:00 PDT 1931 Sep 30
2498 -8:00 - PST 1942 Apr 24
2499 -8:00 1:00 PWT 1945 Aug 14 23:00u
2500 -8:00 1:00 PPT 1945 Nov 12 # Peace
2501 -8:00 - PST 1948 Apr 5
2502 -8:00 1:00 PDT 1949 Jan 14
2503 -8:00 - PST 1954
2504 -8:00 CA P%sT 1961
2505 -8:00 - PST 1976
2506 -8:00 US P%sT 1996
2507 -8:00 Mexico P%sT 2001
2508 -8:00 US P%sT 2002 Feb 20
2509 -8:00 Mexico P%sT 2010
2510 -8:00 US P%sT
2511# Baja California (away from US border)
2512Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2513 -7:00 - MST 1924
2514 -8:00 - PST 1927 Jun 10 23:00
2515 -7:00 - MST 1930 Nov 15
2516 -8:00 - PST 1931 Apr 1
2517 -8:00 1:00 PDT 1931 Sep 30
2518 -8:00 - PST 1942 Apr 24
2519 -8:00 1:00 PWT 1945 Aug 14 23:00u
2520 -8:00 1:00 PPT 1945 Nov 12 # Peace
2521 -8:00 - PST 1948 Apr 5
2522 -8:00 1:00 PDT 1949 Jan 14
2523 -8:00 - PST 1954
2524 -8:00 CA P%sT 1961
2525 -8:00 - PST 1976
2526 -8:00 US P%sT 1996
2527 -8:00 Mexico P%sT 2001
2528 -8:00 US P%sT 2002 Feb 20
2529 -8:00 Mexico P%sT
2530# From Paul Eggert (2006-03-22):
2531# Formerly there was an America/Ensenada zone, which differed from
2532# America/Tijuana only in that it did not observe DST from 1976
2533# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2534# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2535# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2536# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2537# DST-observance was a town-by-town matter back then. This concerns
2538# data after 1970 so most likely there should be at least one Zone
2539# other than America/Tijuana for Baja, but it's not clear yet what its
2540# name or contents should be.
2541#
2542# Revillagigedo Is
2543# no information
2544
2545###############################################################################
2546
2547# Anguilla
2548# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2549Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2550 -4:00 - AST
2551
2552# Antigua and Barbuda
2553# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2554Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2555 -5:00 - EST 1951
2556 -4:00 - AST
2557
2558# Bahamas
2559#
|
| 2560# For 1899 Milne gives -5:09:29.5; round that.
2561#
|
2557# From Sue Williams (2006-12-07):
2558# The Bahamas announced about a month ago that they plan to change their DST
2559# rules to sync with the U.S. starting in 2007....
2560# http://www.jonesbahamas.com/?c=45&a=10412
2561
2562# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2563Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2564Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2565# Zone NAME GMTOFF RULES FORMAT [UNTIL]
| 2562# From Sue Williams (2006-12-07):
2563# The Bahamas announced about a month ago that they plan to change their DST
2564# rules to sync with the U.S. starting in 2007....
2565# http://www.jonesbahamas.com/?c=45&a=10412
2566
2567# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2568Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2569Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2570# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
2566Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
| 2571Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
|
2567 -5:00 Bahamas E%sT 1976
2568 -5:00 US E%sT
2569
2570# Barbados
| 2572 -5:00 Bahamas E%sT 1976
2573 -5:00 US E%sT
2574
2575# Barbados
|
| 2576
2577# For 1899 Milne gives -3:58:29.2; round that.
2578
|
2571# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2572Rule Barb 1977 only - Jun 12 2:00 1:00 D
2573Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2574Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2575Rule Barb 1979 only - Sep 30 2:00 0 S
2576Rule Barb 1980 only - Sep 25 2:00 0 S
2577# Zone NAME GMTOFF RULES FORMAT [UNTIL]
| 2579# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2580Rule Barb 1977 only - Jun 12 2:00 1:00 D
2581Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2582Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2583Rule Barb 1979 only - Sep 30 2:00 0 S
2584Rule Barb 1980 only - Sep 25 2:00 0 S
2585# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
2578Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
2579 -3:58:28 - BMT 1932 # Bridgetown Mean Time
| 2586Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2587 -3:58:29 - BMT 1932 # Bridgetown Mean Time
|
2580 -4:00 Barb A%sT
2581
2582# Belize
2583# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2584# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2585Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2586Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2587Rule Belize 1973 only - Dec 5 0:00 1:00 D
2588Rule Belize 1974 only - Feb 9 0:00 0 S
2589Rule Belize 1982 only - Dec 18 0:00 1:00 D
2590Rule Belize 1983 only - Feb 12 0:00 0 S
2591# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2592Zone America/Belize -5:52:48 - LMT 1912 Apr
2593 -6:00 Belize C%sT
2594
2595# Bermuda
2596
| 2588 -4:00 Barb A%sT
2589
2590# Belize
2591# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2592# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2593Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2594Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2595Rule Belize 1973 only - Dec 5 0:00 1:00 D
2596Rule Belize 1974 only - Feb 9 0:00 0 S
2597Rule Belize 1982 only - Dec 18 0:00 1:00 D
2598Rule Belize 1983 only - Feb 12 0:00 0 S
2599# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2600Zone America/Belize -5:52:48 - LMT 1912 Apr
2601 -6:00 Belize C%sT
2602
2603# Bermuda
2604
|
| 2605# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2606# Bermuda dockyard, Ireland I; round that.
2607
|
2597# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2598
2599# Next year, however, clocks in the US will go forward on the second Sunday
2600# in March, until the first Sunday in November. And, after the Time Zone
2601# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2602# Friday, the same thing will happen in Bermuda.
2603# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2604
2605# Zone NAME GMTOFF RULES FORMAT [UNTIL]
| 2608# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2609
2610# Next year, however, clocks in the US will go forward on the second Sunday
2611# in March, until the first Sunday in November. And, after the Time Zone
2612# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2613# Friday, the same thing will happen in Bermuda.
2614# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2615
2616# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
2606Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
| 2617Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
|
2607 -4:00 - AST 1974 Apr 28 2:00
2608 -4:00 Bahamas A%sT 1976
2609 -4:00 US A%sT
2610
2611# Cayman Is
2612# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2613Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2614 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2615 -5:00 - EST
2616
2617# Costa Rica
| 2618 -4:00 - AST 1974 Apr 28 2:00
2619 -4:00 Bahamas A%sT 1976
2620 -4:00 US A%sT
2621
2622# Cayman Is
2623# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2624Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2625 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2626 -5:00 - EST
2627
2628# Costa Rica
|
| 2629
2630# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2631
|
2618# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2619Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2620Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2621Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2622# IATA SSIM (1991-09) says the following was at 1:00;
2623# go with Shanks & Pottenger.
2624Rule CR 1991 only - Jul 1 0:00 0 S
2625Rule CR 1992 only - Mar 15 0:00 0 S
2626# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2627# Zone NAME GMTOFF RULES FORMAT [UNTIL]
| 2632# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2633Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2634Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2635Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2636# IATA SSIM (1991-09) says the following was at 1:00;
2637# go with Shanks & Pottenger.
2638Rule CR 1991 only - Jul 1 0:00 0 S
2639Rule CR 1992 only - Mar 15 0:00 0 S
2640# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2641# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
2628Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
2629 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
| 2642Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2643 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
|
2630 -6:00 CR C%sT
2631# Coco
2632# no information; probably like America/Costa_Rica
2633
2634# Cuba
2635
| 2644 -6:00 CR C%sT
2645# Coco
2646# no information; probably like America/Costa_Rica
2647
2648# Cuba
2649
|
| 2650# From Paul Eggert (2013-02-21):
2651# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2652# for the port, and -5:30 for meteorological observations.
2653# For now, stick with Shanks & Pottenger.
2654
|
2636# From Arthur David Olson (1999-03-29):
2637# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2638# the Cuban National Team and the Baltimore Orioles was carried live on
2639# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2640# During the game, play-by-play announcer Jim Hunter noted that
2641# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2642# Time today." (The "two hour" remark referred to losing one hour of
2643# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2644# to DST--and one more hour on 1999-04-04--when the announcers will have
2645# returned to Baltimore, which switches on that date.)
2646
2647# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2648# Cuba is not going back to standard time this year.
2649# From Paul Eggert (2006-03-22):
2650# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2651# says that it's due to a problem at the Antonio Guiteras
2652# thermoelectric plant, and says "This October there will be no return
2653# to normal hours (after daylight saving time)".
2654# For now, let's assume that it's a temporary measure.
2655
2656# From Carlos A. Carnero Delgado (2005-11-12):
2657# This year (just like in 2004-2005) there's no change in time zone
2658# adjustment in Cuba. We will stay in daylight saving time:
2659# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2660
2661# From Jesper Norgaard Welen (2006-10-21):
2662# An article in GRANMA INTERNACIONAL claims that Cuba will end
2663# the 3 years of permanent DST next weekend, see
2664# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2665# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2666# watches should be set back one hour -- going back to 00:00 hours -- returning
2667# to the normal schedule....
2668
2669# From Paul Eggert (2007-03-02):
2670# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2671# says Cuban clocks will advance at midnight on March 10.
2672# For lack of better information, assume Cuba will use US rules,
2673# except that it switches at midnight standard time as usual.
2674#
2675# From Steffen Thorsen (2007-10-25):
2676# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2677# earlier - on the last Sunday of October, just like in 2006.
2678#
2679# He supplied these references:
2680#
2681# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2682# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2683#
2684# From Alex Kryvenishev (2007-10-25):
2685# Here is also article from Granma (Cuba):
2686#
2687# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2688# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2689#
2690# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2691
2692# From Arthur David Olson (2008-03-09):
2693# I'm in Maryland which is now observing United States Eastern Daylight
2694# Time. At 9:44 local time I used RealPlayer to listen to
2695# <a href="http://media.enet.cu/radioreloj">
2696# http://media.enet.cu/radioreloj
2697# </a>, a Cuban information station, and heard
2698# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2699# indicating that Cuba is still on standard time.
2700
2701# From Steffen Thorsen (2008-03-12):
2702# It seems that Cuba will start DST on Sunday, 2007-03-16...
2703# It was announced yesterday, according to this source (in Spanish):
2704# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2705# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2706# </a>
2707#
2708# Some more background information is posted here:
2709# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2710# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2711# </a>
2712#
2713# The article also says that Cuba has been observing DST since 1963,
2714# while Shanks (and tzdata) has 1965 as the first date (except in the
2715# 1940's). Many other web pages in Cuba also claim that it has been
2716# observed since 1963, but with the exception of 1970 - an exception
2717# which is not present in tzdata/Shanks. So there is a chance we need to
2718# change some historic records as well.
2719#
2720# One example:
2721# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2722# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2723# </a>
2724
2725# From Jesper Norgaard Welen (2008-03-13):
2726# The Cuban time change has just been confirmed on the most authoritative
2727# web site, the Granma. Please check out
2728# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2729# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2730# </a>
2731#
2732# Basically as expected after Steffen Thorsens information, the change
2733# will take place midnight between Saturday and Sunday.
2734
2735# From Arthur David Olson (2008-03-12):
2736# Assume Sun>=15 (third Sunday) going forward.
2737
2738# From Alexander Krivenyshev (2009-03-04)
2739# According to the Radio Reloj - Cuba will start Daylight Saving Time on
2740# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2741# not on midnight March 14 / March 15 as previously thought.
2742#
2743# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2744# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2745# (in Spanish)
2746# </a>
2747
2748# From Arthur David Olson (2009-03-09)
2749# I listened over the Internet to
2750# <a href="http://media.enet.cu/readioreloj">
2751# http://media.enet.cu/readioreloj
2752# </a>
2753# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2754# the time was announced as "diez cinco"--the same time as here, indicating
2755# that has indeed switched to DST. Assume second Sunday from 2009 forward.
2756
2757# From Steffen Thorsen (2011-03-08):
2758# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2759# this year. Nothing about the end date known so far (if that has
2760# changed at all).
2761#
2762# Source:
2763# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2764# http://granma.co.cu/2011/03/08/nacional/artic01.html
2765# </a>
2766#
2767# Our info:
2768# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2769# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2770# </a>
2771#
2772# From Steffen Thorsen (2011-10-30)
2773# Cuba will end DST two weeks later this year. Instead of going back
2774# tonight, it has been delayed to 2011-11-13 at 01:00.
2775#
2776# One source (Spanish)
2777# <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2778# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2779# </a>
2780#
2781# Our page:
2782# <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2783# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2784# </a>
2785#
2786# From Steffen Thorsen (2012-03-01)
2787# According to Radio Reloj, Cuba will start DST on Midnight between March
2788# 31 and April 1.
2789#
2790# Radio Reloj has the following info (Spanish):
2791# <a href="http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril">
2792# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2793# </a>
2794#
2795# Our info on it:
2796# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2797# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2798# </a>
2799
2800# From Steffen Thorsen (2012-11-03):
2801# Radio Reloj and many other sources report that Cuba is changing back
2802# to standard time on 2012-11-04:
2803# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2804# From Paul Eggert (2012-11-03):
2805# For now, assume the future rule is first Sunday in November.
2806
2807# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2808Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2809Rule Cuba 1928 only - Oct 10 0:00 0 S
2810Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2811Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2812Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2813Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2814Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2815Rule Cuba 1965 only - Sep 30 0:00 0 S
2816Rule Cuba 1966 only - May 29 0:00 1:00 D
2817Rule Cuba 1966 only - Oct 2 0:00 0 S
2818Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2819Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2820Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2821Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2822Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2823Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2824Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2825Rule Cuba 1978 only - May 7 0:00 1:00 D
2826Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2827Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2828Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2829Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2830Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2831Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2832Rule Cuba 1996 only - Oct 6 0:00s 0 S
2833Rule Cuba 1997 only - Oct 12 0:00s 0 S
2834Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2835Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2836Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2837Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2838Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2839Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2840Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2841Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2842Rule Cuba 2011 only - Nov 13 0:00s 0 S
2843Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2844Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2845Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2846
2847# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2848Zone America/Havana -5:29:28 - LMT 1890
2849 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2850 -5:00 Cuba C%sT
2851
2852# Dominica
2853# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2854Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2855 -4:00 - AST
2856
2857# Dominican Republic
2858
2859# From Steffen Thorsen (2000-10-30):
2860# Enrique Morales reported to me that the Dominican Republic has changed the
2861# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2862# http://www.listin.com.do/antes/261000/republica/princi.html
2863
2864# From Paul Eggert (2000-12-04):
2865# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2866
2867# From Rives McDow (2000-12-01):
2868# Dominican Republic changed its mind and presidential decree on Tuesday,
2869# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2870# Dominican Republic will be reverting to 8 hours from the International Date
2871# Line, and will not be using DST in the foreseeable future. The reason they
2872# decided to use DST was to be in synch with Puerto Rico, who was also going
2873# to implement DST. When Puerto Rico didn't implement DST, the president
2874# decided to revert.
2875
2876
2877# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2878Rule DR 1966 only - Oct 30 0:00 1:00 D
2879Rule DR 1967 only - Feb 28 0:00 0 S
2880Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2881Rule DR 1970 only - Feb 21 0:00 0 S
2882Rule DR 1971 only - Jan 20 0:00 0 S
2883Rule DR 1972 1974 - Jan 21 0:00 0 S
2884# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2885Zone America/Santo_Domingo -4:39:36 - LMT 1890
2886 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2887 -5:00 DR E%sT 1974 Oct 27
2888 -4:00 - AST 2000 Oct 29 02:00
2889 -5:00 US E%sT 2000 Dec 3 01:00
2890 -4:00 - AST
2891
2892# El Salvador
2893
2894# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2895Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2896Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2897# There are too many San Salvadors elsewhere, so use America/El_Salvador
2898# instead of America/San_Salvador.
2899# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2900Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2901 -6:00 Salv C%sT
2902
2903# Grenada
2904# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2905Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2906 -4:00 - AST
2907
2908# Guadeloupe
2909# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2910Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2911 -4:00 - AST
2912# St Barthelemy
2913Link America/Guadeloupe America/St_Barthelemy
2914# St Martin (French part)
2915Link America/Guadeloupe America/Marigot
2916
2917# Guatemala
2918#
2919# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2920# Diario Co Latino, at
2921# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2922# says in an article dated 2006-04-19 that the Guatemalan government had
2923# decided on that date to advance official time by 60 minutes, to lessen the
2924# impact of the elevated cost of oil.... Daylight saving time will last from
2925# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2926# From Paul Eggert (2006-06-22):
2927# The Ministry of Energy and Mines, press release CP-15/2006
2928# (2006-04-19), says DST ends at 24:00. See
2929# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2930
2931# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2932Rule Guat 1973 only - Nov 25 0:00 1:00 D
2933Rule Guat 1974 only - Feb 24 0:00 0 S
2934Rule Guat 1983 only - May 21 0:00 1:00 D
2935Rule Guat 1983 only - Sep 22 0:00 0 S
2936Rule Guat 1991 only - Mar 23 0:00 1:00 D
2937Rule Guat 1991 only - Sep 7 0:00 0 S
2938Rule Guat 2006 only - Apr 30 0:00 1:00 D
2939Rule Guat 2006 only - Oct 1 0:00 0 S
2940# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2941Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2942 -6:00 Guat C%sT
2943
2944# Haiti
2945# From Gwillim Law (2005-04-15):
2946# Risto O. Nykanen wrote me that Haiti is now on DST.
2947# I searched for confirmation, and I found a
2948# <a href="http://www.haitianconsulate.org/time.doc"> press release
2949# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2950# </a>. Translated from French, it says:
2951#
2952# "The Prime Minister's Communication Office notifies the public in general
2953# and the press in particular that, following a decision of the Interior
2954# Ministry and the Territorial Collectivities [I suppose that means the
2955# provinces], Haiti will move to Eastern Daylight Time in the night from next
2956# Saturday the 2nd to Sunday the 3rd.
2957#
2958# "Consequently, the Prime Minister's Communication Office wishes to inform
2959# the population that the country's clocks will be set forward one hour
2960# starting at midnight. This provision will hold until the last Saturday in
2961# October 2005.
2962#
2963# "Port-au-Prince, March 31, 2005"
2964#
2965# From Steffen Thorsen (2006-04-04):
2966# I have been informed by users that Haiti observes DST this year like
2967# last year, so the current "only" rule for 2005 might be changed to a
2968# "max" rule or to last until 2006. (Who knows if they will observe DST
2969# next year or if they will extend their DST like US/Canada next year).
2970#
2971# I have found this article about it (in French):
2972# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2973#
2974# The reason seems to be an energy crisis.
2975
2976# From Stephen Colebourne (2007-02-22):
2977# Some IATA info: Haiti won't be having DST in 2007.
2978
2979# From Steffen Thorsen (2012-03-11):
2980# According to several news sources, Haiti will observe DST this year,
2981# apparently using the same start and end date as USA/Canada.
2982# So this means they have already changed their time.
2983#
| 2655# From Arthur David Olson (1999-03-29):
2656# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2657# the Cuban National Team and the Baltimore Orioles was carried live on
2658# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2659# During the game, play-by-play announcer Jim Hunter noted that
2660# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2661# Time today." (The "two hour" remark referred to losing one hour of
2662# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2663# to DST--and one more hour on 1999-04-04--when the announcers will have
2664# returned to Baltimore, which switches on that date.)
2665
2666# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2667# Cuba is not going back to standard time this year.
2668# From Paul Eggert (2006-03-22):
2669# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2670# says that it's due to a problem at the Antonio Guiteras
2671# thermoelectric plant, and says "This October there will be no return
2672# to normal hours (after daylight saving time)".
2673# For now, let's assume that it's a temporary measure.
2674
2675# From Carlos A. Carnero Delgado (2005-11-12):
2676# This year (just like in 2004-2005) there's no change in time zone
2677# adjustment in Cuba. We will stay in daylight saving time:
2678# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2679
2680# From Jesper Norgaard Welen (2006-10-21):
2681# An article in GRANMA INTERNACIONAL claims that Cuba will end
2682# the 3 years of permanent DST next weekend, see
2683# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2684# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2685# watches should be set back one hour -- going back to 00:00 hours -- returning
2686# to the normal schedule....
2687
2688# From Paul Eggert (2007-03-02):
2689# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2690# says Cuban clocks will advance at midnight on March 10.
2691# For lack of better information, assume Cuba will use US rules,
2692# except that it switches at midnight standard time as usual.
2693#
2694# From Steffen Thorsen (2007-10-25):
2695# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2696# earlier - on the last Sunday of October, just like in 2006.
2697#
2698# He supplied these references:
2699#
2700# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2701# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2702#
2703# From Alex Kryvenishev (2007-10-25):
2704# Here is also article from Granma (Cuba):
2705#
2706# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2707# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2708#
2709# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2710
2711# From Arthur David Olson (2008-03-09):
2712# I'm in Maryland which is now observing United States Eastern Daylight
2713# Time. At 9:44 local time I used RealPlayer to listen to
2714# <a href="http://media.enet.cu/radioreloj">
2715# http://media.enet.cu/radioreloj
2716# </a>, a Cuban information station, and heard
2717# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2718# indicating that Cuba is still on standard time.
2719
2720# From Steffen Thorsen (2008-03-12):
2721# It seems that Cuba will start DST on Sunday, 2007-03-16...
2722# It was announced yesterday, according to this source (in Spanish):
2723# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2724# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2725# </a>
2726#
2727# Some more background information is posted here:
2728# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2729# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2730# </a>
2731#
2732# The article also says that Cuba has been observing DST since 1963,
2733# while Shanks (and tzdata) has 1965 as the first date (except in the
2734# 1940's). Many other web pages in Cuba also claim that it has been
2735# observed since 1963, but with the exception of 1970 - an exception
2736# which is not present in tzdata/Shanks. So there is a chance we need to
2737# change some historic records as well.
2738#
2739# One example:
2740# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2741# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2742# </a>
2743
2744# From Jesper Norgaard Welen (2008-03-13):
2745# The Cuban time change has just been confirmed on the most authoritative
2746# web site, the Granma. Please check out
2747# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2748# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2749# </a>
2750#
2751# Basically as expected after Steffen Thorsens information, the change
2752# will take place midnight between Saturday and Sunday.
2753
2754# From Arthur David Olson (2008-03-12):
2755# Assume Sun>=15 (third Sunday) going forward.
2756
2757# From Alexander Krivenyshev (2009-03-04)
2758# According to the Radio Reloj - Cuba will start Daylight Saving Time on
2759# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2760# not on midnight March 14 / March 15 as previously thought.
2761#
2762# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2763# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2764# (in Spanish)
2765# </a>
2766
2767# From Arthur David Olson (2009-03-09)
2768# I listened over the Internet to
2769# <a href="http://media.enet.cu/readioreloj">
2770# http://media.enet.cu/readioreloj
2771# </a>
2772# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2773# the time was announced as "diez cinco"--the same time as here, indicating
2774# that has indeed switched to DST. Assume second Sunday from 2009 forward.
2775
2776# From Steffen Thorsen (2011-03-08):
2777# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2778# this year. Nothing about the end date known so far (if that has
2779# changed at all).
2780#
2781# Source:
2782# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2783# http://granma.co.cu/2011/03/08/nacional/artic01.html
2784# </a>
2785#
2786# Our info:
2787# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2788# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2789# </a>
2790#
2791# From Steffen Thorsen (2011-10-30)
2792# Cuba will end DST two weeks later this year. Instead of going back
2793# tonight, it has been delayed to 2011-11-13 at 01:00.
2794#
2795# One source (Spanish)
2796# <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2797# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2798# </a>
2799#
2800# Our page:
2801# <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2802# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2803# </a>
2804#
2805# From Steffen Thorsen (2012-03-01)
2806# According to Radio Reloj, Cuba will start DST on Midnight between March
2807# 31 and April 1.
2808#
2809# Radio Reloj has the following info (Spanish):
2810# <a href="http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril">
2811# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2812# </a>
2813#
2814# Our info on it:
2815# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2816# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2817# </a>
2818
2819# From Steffen Thorsen (2012-11-03):
2820# Radio Reloj and many other sources report that Cuba is changing back
2821# to standard time on 2012-11-04:
2822# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2823# From Paul Eggert (2012-11-03):
2824# For now, assume the future rule is first Sunday in November.
2825
2826# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2827Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2828Rule Cuba 1928 only - Oct 10 0:00 0 S
2829Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2830Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2831Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2832Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2833Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2834Rule Cuba 1965 only - Sep 30 0:00 0 S
2835Rule Cuba 1966 only - May 29 0:00 1:00 D
2836Rule Cuba 1966 only - Oct 2 0:00 0 S
2837Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2838Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2839Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2840Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2841Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2842Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2843Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2844Rule Cuba 1978 only - May 7 0:00 1:00 D
2845Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2846Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2847Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2848Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2849Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2850Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2851Rule Cuba 1996 only - Oct 6 0:00s 0 S
2852Rule Cuba 1997 only - Oct 12 0:00s 0 S
2853Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2854Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2855Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2856Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2857Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2858Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2859Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2860Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2861Rule Cuba 2011 only - Nov 13 0:00s 0 S
2862Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2863Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2864Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2865
2866# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2867Zone America/Havana -5:29:28 - LMT 1890
2868 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2869 -5:00 Cuba C%sT
2870
2871# Dominica
2872# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2873Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2874 -4:00 - AST
2875
2876# Dominican Republic
2877
2878# From Steffen Thorsen (2000-10-30):
2879# Enrique Morales reported to me that the Dominican Republic has changed the
2880# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2881# http://www.listin.com.do/antes/261000/republica/princi.html
2882
2883# From Paul Eggert (2000-12-04):
2884# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2885
2886# From Rives McDow (2000-12-01):
2887# Dominican Republic changed its mind and presidential decree on Tuesday,
2888# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2889# Dominican Republic will be reverting to 8 hours from the International Date
2890# Line, and will not be using DST in the foreseeable future. The reason they
2891# decided to use DST was to be in synch with Puerto Rico, who was also going
2892# to implement DST. When Puerto Rico didn't implement DST, the president
2893# decided to revert.
2894
2895
2896# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2897Rule DR 1966 only - Oct 30 0:00 1:00 D
2898Rule DR 1967 only - Feb 28 0:00 0 S
2899Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2900Rule DR 1970 only - Feb 21 0:00 0 S
2901Rule DR 1971 only - Jan 20 0:00 0 S
2902Rule DR 1972 1974 - Jan 21 0:00 0 S
2903# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2904Zone America/Santo_Domingo -4:39:36 - LMT 1890
2905 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2906 -5:00 DR E%sT 1974 Oct 27
2907 -4:00 - AST 2000 Oct 29 02:00
2908 -5:00 US E%sT 2000 Dec 3 01:00
2909 -4:00 - AST
2910
2911# El Salvador
2912
2913# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2914Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2915Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2916# There are too many San Salvadors elsewhere, so use America/El_Salvador
2917# instead of America/San_Salvador.
2918# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2919Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2920 -6:00 Salv C%sT
2921
2922# Grenada
2923# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2924Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2925 -4:00 - AST
2926
2927# Guadeloupe
2928# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2929Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2930 -4:00 - AST
2931# St Barthelemy
2932Link America/Guadeloupe America/St_Barthelemy
2933# St Martin (French part)
2934Link America/Guadeloupe America/Marigot
2935
2936# Guatemala
2937#
2938# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2939# Diario Co Latino, at
2940# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2941# says in an article dated 2006-04-19 that the Guatemalan government had
2942# decided on that date to advance official time by 60 minutes, to lessen the
2943# impact of the elevated cost of oil.... Daylight saving time will last from
2944# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2945# From Paul Eggert (2006-06-22):
2946# The Ministry of Energy and Mines, press release CP-15/2006
2947# (2006-04-19), says DST ends at 24:00. See
2948# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2949
2950# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2951Rule Guat 1973 only - Nov 25 0:00 1:00 D
2952Rule Guat 1974 only - Feb 24 0:00 0 S
2953Rule Guat 1983 only - May 21 0:00 1:00 D
2954Rule Guat 1983 only - Sep 22 0:00 0 S
2955Rule Guat 1991 only - Mar 23 0:00 1:00 D
2956Rule Guat 1991 only - Sep 7 0:00 0 S
2957Rule Guat 2006 only - Apr 30 0:00 1:00 D
2958Rule Guat 2006 only - Oct 1 0:00 0 S
2959# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2960Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2961 -6:00 Guat C%sT
2962
2963# Haiti
2964# From Gwillim Law (2005-04-15):
2965# Risto O. Nykanen wrote me that Haiti is now on DST.
2966# I searched for confirmation, and I found a
2967# <a href="http://www.haitianconsulate.org/time.doc"> press release
2968# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2969# </a>. Translated from French, it says:
2970#
2971# "The Prime Minister's Communication Office notifies the public in general
2972# and the press in particular that, following a decision of the Interior
2973# Ministry and the Territorial Collectivities [I suppose that means the
2974# provinces], Haiti will move to Eastern Daylight Time in the night from next
2975# Saturday the 2nd to Sunday the 3rd.
2976#
2977# "Consequently, the Prime Minister's Communication Office wishes to inform
2978# the population that the country's clocks will be set forward one hour
2979# starting at midnight. This provision will hold until the last Saturday in
2980# October 2005.
2981#
2982# "Port-au-Prince, March 31, 2005"
2983#
2984# From Steffen Thorsen (2006-04-04):
2985# I have been informed by users that Haiti observes DST this year like
2986# last year, so the current "only" rule for 2005 might be changed to a
2987# "max" rule or to last until 2006. (Who knows if they will observe DST
2988# next year or if they will extend their DST like US/Canada next year).
2989#
2990# I have found this article about it (in French):
2991# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2992#
2993# The reason seems to be an energy crisis.
2994
2995# From Stephen Colebourne (2007-02-22):
2996# Some IATA info: Haiti won't be having DST in 2007.
2997
2998# From Steffen Thorsen (2012-03-11):
2999# According to several news sources, Haiti will observe DST this year,
3000# apparently using the same start and end date as USA/Canada.
3001# So this means they have already changed their time.
3002#
|
2984# (Sources in French):
2985# <a href="http://www.alterpresse.org/spip.php?article12510">
| |
2986# http://www.alterpresse.org/spip.php?article12510
| 3003# http://www.alterpresse.org/spip.php?article12510
|
2987# </a>
2988# <a href="http://radiovision2000haiti.net/home/?p=13253">
| |
2989# http://radiovision2000haiti.net/home/?p=13253
| 3004# http://radiovision2000haiti.net/home/?p=13253
|
2990# </a>
| |
2991#
| 3005#
|
2992# Our coverage:
2993# <a href="http://www.timeanddate.com/news/time/haiti-dst-2012.html">
2994# http://www.timeanddate.com/news/time/haiti-dst-2012.html
2995# </a>
2996
| |
2997# From Arthur David Olson (2012-03-11):
2998# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
2999# 3:00 a.m. rather than the traditional Haitian jump at midnight.
| 3006# From Arthur David Olson (2012-03-11):
3007# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3008# 3:00 a.m. rather than the traditional Haitian jump at midnight.
|
3000# Assume a US-style fall back as well XXX.
3001# Do not yet assume that the change carries forward past 2012 XXX.
| 3009# Assume a US-style fall back as well.
|
3002
| 3010
|
| 3011# From Steffen Thorsen (2013-03-10):
3012# It appears that Haiti is observing DST this year as well, same rules
3013# as US/Canada. They did it last year as well, and it looks like they
3014# are going to observe DST every year now...
3015#
3016# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3017# http://www.canalplushaiti.net/?p=6714
3018
|
3003# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3004Rule Haiti 1983 only - May 8 0:00 1:00 D
3005Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3006Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3007# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3008# Go with IATA.
3009Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3010Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3011Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3012Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
| 3019# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3020Rule Haiti 1983 only - May 8 0:00 1:00 D
3021Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3022Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3023# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3024# Go with IATA.
3025Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3026Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3027Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3028Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
|
3013Rule Haiti 2012 only - Mar Sun>=8 2:00 1:00 D
3014Rule Haiti 2012 only - Nov Sun>=1 2:00 0 S
| 3029Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3030Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
|
3015# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3016Zone America/Port-au-Prince -4:49:20 - LMT 1890
3017 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3018 -5:00 Haiti E%sT
3019
3020# Honduras
3021# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3022
3023# From Paul Eggert (2006-05-05):
3024# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3025# saying Honduras will start using DST midnight Saturday, effective 4
3026# months until September. La Tribuna reported today
3027# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3028# of Honduras, refused to back down on this.
3029
3030# From Jesper Norgaard Welen (2006-08-08):
3031# It seems that Honduras has returned from DST to standard time this Monday at
3032# 00:00 hours (prolonging Sunday to 25 hours duration).
3033# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3034
3035# From Paul Eggert (2006-08-08):
3036# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3037# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3038# It mentions executive decree 18-2006.
3039
3040# From Steffen Thorsen (2006-08-17):
3041# Honduras will observe DST from 2007 to 2009, exact dates are not
3042# published, I have located this authoritative source:
3043# http://www.presidencia.gob.hn/noticia.aspx?nId=47
3044
3045# From Steffen Thorsen (2007-03-30):
3046# http://www.laprensahn.com/pais_nota.php?id04962=7386
3047# So it seems that Honduras will not enter DST this year....
3048
3049# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3050Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3051Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3052Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3053Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3054# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3055Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3056 -6:00 Hond C%sT
3057#
3058# Great Swan I ceded by US to Honduras in 1972
3059
3060# Jamaica
3061
3062# From Bob Devine (1988-01-28):
3063# Follows US rules.
3064
3065# From U. S. Naval Observatory (1989-01-19):
3066# JAMAICA 5 H BEHIND UTC
3067
3068# From Shanks & Pottenger:
3069# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3070Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
3071 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3072 -5:00 - EST 1974 Apr 28 2:00
3073 -5:00 US E%sT 1984
3074 -5:00 - EST
3075
3076# Martinique
3077# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3078Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3079 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3080 -4:00 - AST 1980 Apr 6
3081 -4:00 1:00 ADT 1980 Sep 28
3082 -4:00 - AST
3083
3084# Montserrat
3085# From Paul Eggert (2006-03-22):
3086# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
3087# world.gazetteer.com says Cork Hill is the most populous location now.
3088# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3089Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
3090 -4:00 - AST
3091
3092# Nicaragua
3093#
3094# This uses Shanks & Pottenger for times before 2005.
3095#
3096# From Steffen Thorsen (2005-04-12):
3097# I've got reports from 8 different people that Nicaragua just started
3098# DST on Sunday 2005-04-10, in order to save energy because of
3099# expensive petroleum. The exact end date for DST is not yet
3100# announced, only "September" but some sites also say "mid-September".
3101# Some background information is available on the President's official site:
3102# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3103# The Decree, no 23-2005 is available here:
3104# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3105#
3106# From Paul Eggert (2005-05-01):
3107# The decree doesn't say anything about daylight saving, but for now let's
3108# assume that it is daylight saving....
3109#
3110# From Gwillim Law (2005-04-21):
3111# The Associated Press story on the time change, which can be found at
3112# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3113# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3114# time that a change of clocks was applied to save energy was in the year 2000
3115# during the Arnoldo Aleman administration."...
3116# The northamerica file says that Nicaragua has been on UTC-6 continuously
3117# since December 1998. I wasn't able to find any details of Nicaraguan time
3118# changes in 2000. Perhaps a note could be added to the northamerica file, to
3119# the effect that we have indirect evidence that DST was observed in 2000.
3120#
3121# From Jesper Norgaard Welen (2005-11-02):
3122# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3123# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3124# (2005-09-26)
3125#
3126# From Jesper Norgaard Welen (2006-05-05):
3127# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3128# (my informal translation)
3129# By order of the president of the republic, Enrique Bolanos, Nicaragua
3130# advanced by sixty minutes their official time, yesterday at 2 in the
3131# morning, and will stay that way until 30.th. of september.
3132#
3133# From Jesper Norgaard Welen (2006-09-30):
3134# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3135# My informal translation runs:
3136# The natural sun time is restored in all the national territory, in that the
3137# time is returned one hour at 01:00 am of October 1 of 2006.
3138#
3139# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3140Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3141Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3142Rule Nic 2005 only - Apr 10 0:00 1:00 D
3143Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3144Rule Nic 2006 only - Apr 30 2:00 1:00 D
3145Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3146# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3147Zone America/Managua -5:45:08 - LMT 1890
3148 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3149 -6:00 - CST 1973 May
3150 -5:00 - EST 1975 Feb 16
3151 -6:00 Nic C%sT 1992 Jan 1 4:00
3152 -5:00 - EST 1992 Sep 24
3153 -6:00 - CST 1993
3154 -5:00 - EST 1997
3155 -6:00 Nic C%sT
3156
3157# Panama
3158# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3159Zone America/Panama -5:18:08 - LMT 1890
3160 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3161 -5:00 - EST
3162
3163# Puerto Rico
3164# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
3165# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3166Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3167 -4:00 - AST 1942 May 3
3168 -4:00 US A%sT 1946
3169 -4:00 - AST
3170
3171# St Kitts-Nevis
3172# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3173Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
3174 -4:00 - AST
3175
3176# St Lucia
3177# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3178Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
3179 -4:04:00 - CMT 1912 # Castries Mean Time
3180 -4:00 - AST
3181
3182# St Pierre and Miquelon
3183# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
3184# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3185Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3186 -4:00 - AST 1980 May
3187 -3:00 - PMST 1987 # Pierre & Miquelon Time
3188 -3:00 Canada PM%sT
3189
3190# St Vincent and the Grenadines
3191# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3192Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
3193 -4:04:56 - KMT 1912 # Kingstown Mean Time
3194 -4:00 - AST
3195
3196# Turks and Caicos
3197#
3198# From Chris Dunn in
3199# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3200# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3201# daylight saving dates for time changes have been adjusted to match
3202# the recent U.S. change of dates.
3203#
3204# From Brian Inglis (2007-04-28):
3205# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3206# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3207# rows before that there is an out of date entry for Oct:
3208# "Eastern Standard Times Begins 2007
3209# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3210# indicating that the normal ET rules are followed.
3211#
3212# From Paul Eggert (2006-05-01):
3213# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3214# says they switch at midnight. Go with Shanks & Pottenger.
3215#
3216# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3217Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3218Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3219Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3220Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3221Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3222# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3223Zone America/Grand_Turk -4:44:32 - LMT 1890
3224 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3225 -5:00 TC E%sT
3226
3227# British Virgin Is
3228# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3229Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
3230 -4:00 - AST
3231
3232# Virgin Is
3233# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3234Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
3235 -4:00 - AST
| 3031# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3032Zone America/Port-au-Prince -4:49:20 - LMT 1890
3033 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3034 -5:00 Haiti E%sT
3035
3036# Honduras
3037# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3038
3039# From Paul Eggert (2006-05-05):
3040# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3041# saying Honduras will start using DST midnight Saturday, effective 4
3042# months until September. La Tribuna reported today
3043# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3044# of Honduras, refused to back down on this.
3045
3046# From Jesper Norgaard Welen (2006-08-08):
3047# It seems that Honduras has returned from DST to standard time this Monday at
3048# 00:00 hours (prolonging Sunday to 25 hours duration).
3049# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3050
3051# From Paul Eggert (2006-08-08):
3052# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3053# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3054# It mentions executive decree 18-2006.
3055
3056# From Steffen Thorsen (2006-08-17):
3057# Honduras will observe DST from 2007 to 2009, exact dates are not
3058# published, I have located this authoritative source:
3059# http://www.presidencia.gob.hn/noticia.aspx?nId=47
3060
3061# From Steffen Thorsen (2007-03-30):
3062# http://www.laprensahn.com/pais_nota.php?id04962=7386
3063# So it seems that Honduras will not enter DST this year....
3064
3065# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3066Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3067Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3068Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3069Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3070# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3071Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3072 -6:00 Hond C%sT
3073#
3074# Great Swan I ceded by US to Honduras in 1972
3075
3076# Jamaica
3077
3078# From Bob Devine (1988-01-28):
3079# Follows US rules.
3080
3081# From U. S. Naval Observatory (1989-01-19):
3082# JAMAICA 5 H BEHIND UTC
3083
3084# From Shanks & Pottenger:
3085# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3086Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
3087 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3088 -5:00 - EST 1974 Apr 28 2:00
3089 -5:00 US E%sT 1984
3090 -5:00 - EST
3091
3092# Martinique
3093# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3094Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3095 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3096 -4:00 - AST 1980 Apr 6
3097 -4:00 1:00 ADT 1980 Sep 28
3098 -4:00 - AST
3099
3100# Montserrat
3101# From Paul Eggert (2006-03-22):
3102# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
3103# world.gazetteer.com says Cork Hill is the most populous location now.
3104# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3105Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
3106 -4:00 - AST
3107
3108# Nicaragua
3109#
3110# This uses Shanks & Pottenger for times before 2005.
3111#
3112# From Steffen Thorsen (2005-04-12):
3113# I've got reports from 8 different people that Nicaragua just started
3114# DST on Sunday 2005-04-10, in order to save energy because of
3115# expensive petroleum. The exact end date for DST is not yet
3116# announced, only "September" but some sites also say "mid-September".
3117# Some background information is available on the President's official site:
3118# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3119# The Decree, no 23-2005 is available here:
3120# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3121#
3122# From Paul Eggert (2005-05-01):
3123# The decree doesn't say anything about daylight saving, but for now let's
3124# assume that it is daylight saving....
3125#
3126# From Gwillim Law (2005-04-21):
3127# The Associated Press story on the time change, which can be found at
3128# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3129# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3130# time that a change of clocks was applied to save energy was in the year 2000
3131# during the Arnoldo Aleman administration."...
3132# The northamerica file says that Nicaragua has been on UTC-6 continuously
3133# since December 1998. I wasn't able to find any details of Nicaraguan time
3134# changes in 2000. Perhaps a note could be added to the northamerica file, to
3135# the effect that we have indirect evidence that DST was observed in 2000.
3136#
3137# From Jesper Norgaard Welen (2005-11-02):
3138# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3139# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3140# (2005-09-26)
3141#
3142# From Jesper Norgaard Welen (2006-05-05):
3143# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3144# (my informal translation)
3145# By order of the president of the republic, Enrique Bolanos, Nicaragua
3146# advanced by sixty minutes their official time, yesterday at 2 in the
3147# morning, and will stay that way until 30.th. of september.
3148#
3149# From Jesper Norgaard Welen (2006-09-30):
3150# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3151# My informal translation runs:
3152# The natural sun time is restored in all the national territory, in that the
3153# time is returned one hour at 01:00 am of October 1 of 2006.
3154#
3155# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3156Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3157Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3158Rule Nic 2005 only - Apr 10 0:00 1:00 D
3159Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3160Rule Nic 2006 only - Apr 30 2:00 1:00 D
3161Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3162# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3163Zone America/Managua -5:45:08 - LMT 1890
3164 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3165 -6:00 - CST 1973 May
3166 -5:00 - EST 1975 Feb 16
3167 -6:00 Nic C%sT 1992 Jan 1 4:00
3168 -5:00 - EST 1992 Sep 24
3169 -6:00 - CST 1993
3170 -5:00 - EST 1997
3171 -6:00 Nic C%sT
3172
3173# Panama
3174# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3175Zone America/Panama -5:18:08 - LMT 1890
3176 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3177 -5:00 - EST
3178
3179# Puerto Rico
3180# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
3181# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3182Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3183 -4:00 - AST 1942 May 3
3184 -4:00 US A%sT 1946
3185 -4:00 - AST
3186
3187# St Kitts-Nevis
3188# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3189Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
3190 -4:00 - AST
3191
3192# St Lucia
3193# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3194Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
3195 -4:04:00 - CMT 1912 # Castries Mean Time
3196 -4:00 - AST
3197
3198# St Pierre and Miquelon
3199# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
3200# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3201Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3202 -4:00 - AST 1980 May
3203 -3:00 - PMST 1987 # Pierre & Miquelon Time
3204 -3:00 Canada PM%sT
3205
3206# St Vincent and the Grenadines
3207# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3208Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
3209 -4:04:56 - KMT 1912 # Kingstown Mean Time
3210 -4:00 - AST
3211
3212# Turks and Caicos
3213#
3214# From Chris Dunn in
3215# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3216# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3217# daylight saving dates for time changes have been adjusted to match
3218# the recent U.S. change of dates.
3219#
3220# From Brian Inglis (2007-04-28):
3221# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3222# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3223# rows before that there is an out of date entry for Oct:
3224# "Eastern Standard Times Begins 2007
3225# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3226# indicating that the normal ET rules are followed.
3227#
3228# From Paul Eggert (2006-05-01):
3229# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3230# says they switch at midnight. Go with Shanks & Pottenger.
3231#
3232# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3233Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3234Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3235Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3236Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3237Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3238# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3239Zone America/Grand_Turk -4:44:32 - LMT 1890
3240 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3241 -5:00 TC E%sT
3242
3243# British Virgin Is
3244# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3245Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
3246 -4:00 - AST
3247
3248# Virgin Is
3249# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3250Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
3251 -4:00 - AST
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