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
603Link Pacific/Honolulu Pacific/Johnston
604
605# Now we turn to US areas that have diverged from the consensus since 1970.
606
607# Arizona mostly uses MST.
608
609# From Paul Eggert (2002-10-20):
610#
611# The information in the rest of this paragraph is derived from the
612# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
613# Daylight Saving Time web page (2002-01-23)</a> maintained by the
614# Arizona State Library, Archives and Public Records.
615# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
616# time, but by federal law railroads, airlines, bus lines, military
617# personnel, and some engaged in interstate commerce continued to
618# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
619# Gazette says that was the date the law changed, and that 04-01 was
620# the date the state's clocks would change. In 1945 the State of
621# Arizona used standard time all year, again with exceptions only as
622# mandated by federal law. Arizona observed DST in 1967, but Arizona
623# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
624#
625# Shanks says the 1944 experiment came to an end on 1944-03-17.
626# Go with the Arizona State Library instead.
627
628Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
629 -7:00 US M%sT 1944 Jan 1 00:01
630 -7:00 - MST 1944 Apr 1 00:01
631 -7:00 US M%sT 1944 Oct 1 00:01
632 -7:00 - MST 1967
633 -7:00 US M%sT 1968 Mar 21
634 -7:00 - MST
635# From Arthur David Olson (1988-02-13):
636# A writer from the Inter Tribal Council of Arizona, Inc.,
637# notes in private correspondence dated 1987-12-28 that "Presently, only the
638# Navajo Nation participates in the Daylight Saving Time policy, due to its
639# large size and location in three states." (The "only" means that other
640# tribal nations don't use DST.)
641#
642# From Paul Eggert (2013-08-26):
643# See America/Denver for a zone appropriate for the Navajo Nation.
644
645# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
646# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
647# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
648# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
649# Teton, Twin Falls, Valley, Washington counties, and the southern
650# quarter of Idaho county) and eastern Oregon (most of Malheur County)
651# switched four weeks late in 1974.
652#
653# Zone NAME GMTOFF RULES FORMAT [UNTIL]
654Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
655 -8:00 US P%sT 1923 May 13 2:00
656 -7:00 US M%sT 1974
657 -7:00 - MST 1974 Feb 3 2:00
658 -7:00 US M%sT
659
660# Indiana
661#
662# For a map of Indiana's time zone regions, see:
663# <a href="http://www.mccsc.edu/time.html">
664# What time is it in Indiana?
665# </a> (2006-03-01)
666#
667# From Paul Eggert (2007-08-17):
668# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
669# with the following exceptions:
670#
671# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
672# Vandenburgh, and Warrick counties have been like America/Chicago.
673#
674# - Dearborn and Ohio counties have been like America/New_York.
675#
676# - Clark, Floyd, and Harrison counties have been like
677# America/Kentucky/Louisville.
678#
679# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
680# and Switzerland counties have their own time zone histories as noted below.
681#
682# Shanks partitioned Indiana into 345 regions, each with its own time history,
683# and wrote "Even newspaper reports present contradictory information."
684# Those Hoosiers! Such a flighty and changeable people!
685# Fortunately, most of the complexity occurred before our cutoff date of 1970.
686#
687# Other than Indianapolis, the Indiana place names are so nondescript
688# that they would be ambiguous if we left them at the 'America' level.
689# So we reluctantly put them all in a subdirectory 'America/Indiana'.
690
691# From Paul Eggert (2005-08-16):
692# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
693
694# From Nathan Stratton Treadway (2006-03-30):
695# http://www.dot.gov/affairs/dot0406.htm [3705 B]
696# From Deborah Goldsmith (2006-01-18):
697# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
698# From Paul Eggert (2006-01-20):
699# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
700# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
701# Eastern Time Zone to the Central Time Zone.... The effective date of
702# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
703# changeover date from standard time to Daylight Saving Time."
704# Strictly speaking, this means the affected counties will change their
705# clocks twice that night, but this obviously is in error. The intent
706# is that 01:59:59 EST be followed by 02:00:00 CDT.
707
708# From Gwillim Law (2007-02-10):
709# The Associated Press has been reporting that Pulaski County, Indiana is
710# going to switch from Central to Eastern Time on March 11, 2007....
711# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
712
713# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
714Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
715Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
716Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
717# Zone NAME GMTOFF RULES FORMAT [UNTIL]
718Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
719 -6:00 US C%sT 1920
720 -6:00 Indianapolis C%sT 1942
721 -6:00 US C%sT 1946
722 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
723 -5:00 - EST 1957 Sep 29 2:00
724 -6:00 - CST 1958 Apr 27 2:00
725 -5:00 - EST 1969
726 -5:00 US E%sT 1971
727 -5:00 - EST 2006
728 -5:00 US E%sT
729#
730# Eastern Crawford County, Indiana, left its clocks alone in 1974,
731# as well as from 1976 through 2005.
732# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
733Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
734Rule Marengo 1951 only - Sep lastSun 2:00 0 S
735Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
736Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
737# Zone NAME GMTOFF RULES FORMAT [UNTIL]
738Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
739 -6:00 US C%sT 1951
740 -6:00 Marengo C%sT 1961 Apr 30 2:00
741 -5:00 - EST 1969
742 -5:00 US E%sT 1974 Jan 6 2:00
743 -6:00 1:00 CDT 1974 Oct 27 2:00
744 -5:00 US E%sT 1976
745 -5:00 - EST 2006
746 -5:00 US E%sT
747#
748# Daviess, Dubois, Knox, and Martin Counties, Indiana,
749# switched from eastern to central time in April 2006, then switched back
750# in November 2007.
751# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
752Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
753Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
754Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
755Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
756Rule Vincennes 1955 only - May 1 0:00 1:00 D
757Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
758Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
759Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
760Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
762Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
763 -6:00 US C%sT 1946
764 -6:00 Vincennes C%sT 1964 Apr 26 2:00
765 -5:00 - EST 1969
766 -5:00 US E%sT 1971
767 -5:00 - EST 2006 Apr 2 2:00
768 -6:00 US C%sT 2007 Nov 4 2:00
769 -5:00 US E%sT
770#
771# Perry County, Indiana, switched from eastern to central time in April 2006.
772# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
773Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
774Rule Perry 1946 only - Sep lastSun 2:00 0 S
775Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
776Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
777Rule Perry 1955 only - May 1 0:00 1:00 D
778Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
779Rule Perry 1960 only - Oct lastSun 2:00 0 S
780Rule Perry 1961 only - Sep lastSun 2:00 0 S
781Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
782# Zone NAME GMTOFF RULES FORMAT [UNTIL]
783Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
784 -6:00 US C%sT 1946
785 -6:00 Perry C%sT 1964 Apr 26 2:00
786 -5:00 - EST 1969
787 -5:00 US E%sT 1971
788 -5:00 - EST 2006 Apr 2 2:00
789 -6:00 US C%sT
790#
791# Pike County, Indiana moved from central to eastern time in 1977,
792# then switched back in 2006, then switched back again in 2007.
793# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
794Rule Pike 1955 only - May 1 0:00 1:00 D
795Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
796Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
797Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
800 -6:00 US C%sT 1955
801 -6:00 Pike C%sT 1965 Apr 25 2:00
802 -5:00 - EST 1966 Oct 30 2:00
803 -6:00 US C%sT 1977 Oct 30 2:00
804 -5:00 - EST 2006 Apr 2 2:00
805 -6:00 US C%sT 2007 Nov 4 2:00
806 -5:00 US E%sT
807#
808# Starke County, Indiana moved from central to eastern time in 1991,
809# then switched back in 2006.
810# From Arthur David Olson (1991-10-28):
811# An article on page A3 of the Sunday, 1991-10-27 Washington Post
812# notes that Starke County switched from Central time to Eastern time as of
813# 1991-10-27.
814# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
815Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
816Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
817Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
818Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
819Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
820# Zone NAME GMTOFF RULES FORMAT [UNTIL]
821Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
822 -6:00 US C%sT 1947
823 -6:00 Starke C%sT 1962 Apr 29 2:00
824 -5:00 - EST 1963 Oct 27 2:00
825 -6:00 US C%sT 1991 Oct 27 2:00
826 -5:00 - EST 2006 Apr 2 2:00
827 -6:00 US C%sT
828#
829# Pulaski County, Indiana, switched from eastern to central time in
830# April 2006 and then switched back in March 2007.
831# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
832Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
833Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
834Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
835Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
836# Zone NAME GMTOFF RULES FORMAT [UNTIL]
837Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
838 -6:00 US C%sT 1946
839 -6:00 Pulaski C%sT 1961 Apr 30 2:00
840 -5:00 - EST 1969
841 -5:00 US E%sT 1971
842 -5:00 - EST 2006 Apr 2 2:00
843 -6:00 US C%sT 2007 Mar 11 2:00
844 -5:00 US E%sT
845#
846# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
847# Zone NAME GMTOFF RULES FORMAT [UNTIL]
848Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
849 -6:00 US C%sT 1954 Apr 25 2:00
850 -5:00 - EST 1969
851 -5:00 US E%sT 1973
852 -5:00 - EST 2006
853 -5:00 US E%sT
854
855# Part of Kentucky left its clocks alone in 1974.
856# This also includes Clark, Floyd, and Harrison counties in Indiana.
857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
858Rule Louisville 1921 only - May 1 2:00 1:00 D
859Rule Louisville 1921 only - Sep 1 2:00 0 S
860Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
861Rule Louisville 1941 only - Sep lastSun 2:00 0 S
862Rule Louisville 1946 only - Jun 2 2:00 0 S
863Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
864Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
865# Zone NAME GMTOFF RULES FORMAT [UNTIL]
866Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
867 -6:00 US C%sT 1921
868 -6:00 Louisville C%sT 1942
869 -6:00 US C%sT 1946
870 -6:00 Louisville C%sT 1961 Jul 23 2:00
871 -5:00 - EST 1968
872 -5:00 US E%sT 1974 Jan 6 2:00
873 -6:00 1:00 CDT 1974 Oct 27 2:00
874 -5:00 US E%sT
875#
876# Wayne County, Kentucky
877#
878# From
879# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
880# Lake Cumberland LIFE
881# </a> (1999-01-29) via WKYM-101.7:
882# Clinton County has joined Wayne County in asking the DoT to change from
883# the Central to the Eastern time zone.... The Wayne County government made
884# the same request in December. And while Russell County officials have not
885# taken action, the majority of respondents to a poll conducted there in
886# August indicated they would like to change to "fast time" also.
887# The three Lake Cumberland counties are the farthest east of any U.S.
888# location in the Central time zone.
889#
890# From Rich Wales (2000-08-29):
891# After prolonged debate, and despite continuing deep differences of opinion,
892# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
893# (-0500) time. They won't "fall back" this year. See Sara Shipley,
894# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
895#
896# From Paul Eggert (2001-07-16):
897# The final rule was published in the
898# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
899# Federal Register 65, 160 (2000-08-17), page 50154-50158.
900# </a>
901#
902Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
903 -6:00 US C%sT 1946
904 -6:00 - CST 1968
905 -6:00 US C%sT 2000 Oct 29 2:00
906 -5:00 US E%sT
907
908
909# From Rives McDow (2000-08-30):
910# Here ... are all the changes in the US since 1985.
911# Kearny County, KS (put all of county on central;
912# previously split between MST and CST) ... 1990-10
913# Starke County, IN (from CST to EST) ... 1991-10
914# Oliver County, ND (from MST to CST) ... 1992-10
915# West Wendover, NV (from PST TO MST) ... 1999-10
916# Wayne County, KY (from CST to EST) ... 2000-10
917#
918# From Paul Eggert (2001-07-17):
919# We don't know where the line used to be within Kearny County, KS,
920# so omit that change for now.
921# See America/Indiana/Knox for the Starke County, IN change.
922# See America/North_Dakota/Center for the Oliver County, ND change.
923# West Wendover, NV officially switched from Pacific to mountain time on
924# 1999-10-31. See the
925# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
926# Federal Register 64, 203 (1999-10-21), page 56705-56707.
927# </a>
928# However, the Federal Register says that West Wendover already operated
929# on mountain time, and the rule merely made this official;
930# hence a separate tz entry is not needed.
931
932# Michigan
933#
934# From Bob Devine (1988-01-28):
935# Michigan didn't observe DST from 1968 to 1973.
936#
937# From Paul Eggert (1999-03-31):
938# Shanks writes that Michigan started using standard time on 1885-09-18,
939# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
940# that Detroit kept
941#
942# local time until 1900 when the City Council decreed that clocks should
943# be put back twenty-eight minutes to Central Standard Time. Half the
944# city obeyed, half refused. After considerable debate, the decision
945# was rescinded and the city reverted to Sun time. A derisive offer to
946# erect a sundial in front of the city hall was referred to the
947# Committee on Sewers. Then, in 1905, Central time was adopted
948# by city vote.
949#
950# This story is too entertaining to be false, so go with Howse over Shanks.
951#
952# From Paul Eggert (2001-03-06):
953# Garland (1927) writes "Cleveland and Detroit advanced their clocks
954# one hour in 1914." This change is not in Shanks. We have no more
955# info, so omit this for now.
956#
957# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
959Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
960Rule Detroit 1948 only - Sep lastSun 2:00 0 S
961Rule Detroit 1967 only - Jun 14 2:00 1:00 D
962Rule Detroit 1967 only - Oct lastSun 2:00 0 S
963# Zone NAME GMTOFF RULES FORMAT [UNTIL]
964Zone America/Detroit -5:32:11 - LMT 1905
965 -6:00 - CST 1915 May 15 2:00
966 -5:00 - EST 1942
967 -5:00 US E%sT 1946
968 -5:00 Detroit E%sT 1973
969 -5:00 US E%sT 1975
970 -5:00 - EST 1975 Apr 27 2:00
971 -5:00 US E%sT
972#
973# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
974# switched from EST to CST/CDT in 1973.
975# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
976Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
977Rule Menominee 1946 only - Sep lastSun 2:00 0 S
978Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
979Rule Menominee 1966 only - Oct lastSun 2:00 0 S
980# Zone NAME GMTOFF RULES FORMAT [UNTIL]
981Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
982 -6:00 US C%sT 1946
983 -6:00 Menominee C%sT 1969 Apr 27 2:00
984 -5:00 - EST 1973 Apr 29 2:00
985 -6:00 US C%sT
986
987# Navassa
988# administered by the US Fish and Wildlife Service
989# claimed by US under the provisions of the 1856 Guano Islands Act
990# also claimed by Haiti
991# occupied 1857/1900 by the Navassa Phosphate Co
992# US lighthouse 1917/1996-09
993# currently uninhabited
994# see Mark Fineman, "An Isle Rich in Guano and Discord",
995# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
996# Jimmy Skaggs, _The Great Guano Rush_ (1994).
997
998################################################################################
999
1000
1001# From Paul Eggert (2006-03-22):
1002# A good source for time zone historical data outside the U.S. is
1003# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1004# San Diego: ACS Publications, Inc. (2003).
1005#
1006# Gwillim Law writes that a good source
1007# for recent time zone data is the International Air Transport
1008# Association's Standard Schedules Information Manual (IATA SSIM),
1009# published semiannually. Law sent in several helpful summaries
1010# of the IATA's data after 1990.
1011#
1012# Except where otherwise noted, Shanks & Pottenger is the source for
1013# entries through 1990, and IATA SSIM is the source for entries afterwards.
1014#
1015# Other sources occasionally used include:
1016#
1017# Edward W. Whitman, World Time Differences,
1018# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1019# which I found in the UCLA library.
1020#
1021# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1022# William Willett, The Waste of Daylight, 19th edition
1023# </a> (1914-03)
1024#
1025# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1026# <http://www.jstor.org/stable/1774359>.
1027#
1028# See the 'europe' file for Greenland.
1029
1030# Canada
1031
1032# From Alain LaBont<e'> (1994-11-14):
1033# I post here the time zone abbreviations standardized in Canada
1034# for both English and French in the CAN/CSA-Z234.4-89 standard....
1035#
1036# UTC Standard time Daylight savings time
1037# offset French English French English
1038# -2:30 - - HAT NDT
1039# -3 - - HAA ADT
1040# -3:30 HNT NST - -
1041# -4 HNA AST HAE EDT
1042# -5 HNE EST HAC CDT
1043# -6 HNC CST HAR MDT
1044# -7 HNR MST HAP PDT
1045# -8 HNP PST HAY YDT
1046# -9 HNY YST - -
1047#
1048# HN: Heure Normale ST: Standard Time
1049# HA: Heure Avanc<e'>e DT: Daylight saving Time
1050#
1051# A: de l'Atlantique Atlantic
1052# C: du Centre Central
1053# E: de l'Est Eastern
1054# M: Mountain
1055# N: Newfoundland
1056# P: du Pacifique Pacific
1057# R: des Rocheuses
1058# T: de Terre-Neuve
1059# Y: du Yukon Yukon
1060#
1061# From Paul Eggert (1994-11-22):
1062# Alas, this sort of thing must be handled by localization software.
1063
1064# Unless otherwise specified, the data for Canada are all from Shanks
1065# & Pottenger.
1066
1067# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1068# 2007-03-01):
1069# The British Columbia government announced yesterday that it will
1070# adjust daylight savings next year to align with changes in the
1071# U.S. and the rest of Canada....
1072# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1073# ...
1074# Nova Scotia
1075# Daylight saving time will be extended by four weeks starting in 2007....
1076# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1077#
1078# [For New Brunswick] the new legislation dictates that the time change is to
1079# be done at 02:00 instead of 00:01.
1080# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1081# ...
1082# Manitoba has traditionally changed the clock every fall at 03:00.
1083# As of 2006, the transition is to take place one hour earlier at 02:00.
1084# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1085# ...
1086# [Alberta, Ontario, Quebec] will follow US rules.
1087# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1088# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1089# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1090# ...
1091# P.E.I. will follow US rules....
1092# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1093# ...
1094# Province of Newfoundland and Labrador....
1095# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1096# ...
1097# Yukon
1098# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1099# ...
1100# N.W.T. will follow US rules. Whoever maintains the government web site
1101# does not seem to believe in bookmarks. To see the news release, click the
1102# following link and search for "Daylight Savings Time Change". Press the
1103# "Daylight Savings Time Change" link; it will fire off a popup using
1104# JavaScript.
1105# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1106# ...
1107# Nunavut
1108# An amendment to the Interpretation Act was registered on February 19/2007....
1109# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1110
1111# From Paul Eggert (2006-04-25):
1112# H. David Matthews and Mary Vincent's map
1113# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1114# "It's about TIME", _Canadian Geographic_ (September-October 1998)
1115# </a> contains detailed boundaries for regions observing nonstandard
1116# time and daylight saving time arrangements in Canada circa 1998.
1117#
1118# INMS, the Institute for National Measurement Standards in Ottawa, has <a
1119# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1120# information about standard and daylight saving time zones in Canada.
1121# </a> (updated periodically).
1122# Its unofficial information is often taken from Matthews and Vincent.
1123
1124# From Paul Eggert (2006-06-27):
1125# For now, assume all of DST-observing Canada will fall into line with the
1126# new US DST rules,
1127
1128# From Chris Walton (2011-12-01)
1129# In the first of Tammy Hardwick's articles
1130# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1131# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1132# </a>
1133# she quotes the Friday November 1/1918 edition of the Creston Review.
1134# The quote includes these two statements:
1135# 'Sunday the CPR went back to the old system of time...'
1136# '... The daylight saving scheme was dropped all over Canada at the same time,'
1137# These statements refer to a transition from daylight time to standard time
1138# that occurred nationally on Sunday October 27/1918. This transition was
1139# also documented in the Saturday October 26/1918 edition of the Toronto Star.
1140
1141# In light of that evidence, we alter the date from the earlier believed
1142# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1143# than Thursday) in all Canadian rulesets.
1144
1145# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1146Rule Canada 1918 only - Apr 14 2:00 1:00 D
1147Rule Canada 1918 only - Oct 27 2:00 0 S
1148Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1149Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1150Rule Canada 1945 only - Sep 30 2:00 0 S
1151Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1152Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1153Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1154Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1155Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1156
1157
1158# Newfoundland and Labrador
1159
1160# From Paul Eggert (2000-10-02):
1161# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1162# but the only part of Labrador that follows the rules is the
1163# southeast corner, including Port Hope Simpson and Mary's Harbour,
1164# but excluding, say, Black Tickle.
1165
1166# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1167Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1168Rule StJohns 1917 only - Sep 17 2:00 0 S
1169# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1170Rule StJohns 1919 only - May 5 23:00 1:00 D
1171Rule StJohns 1919 only - Aug 12 23:00 0 S
1172# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1173Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1174Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1175# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1176# Pottenger.
1177Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1178Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1179# Whitman gives the following transitions:
1180# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1181# but go with Shanks & Pottenger and assume they used Canadian rules.
1182# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1183# Apr 30 - Sep 24; go with Shanks & Pottenger.
1184Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1185Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1186Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1187Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1188Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1189# From Paul Eggert (2000-10-02):
1190# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1191# at 00:01 local time. For now, assume it started in 1987.
1192
1193# From Michael Pelley (2011-09-12):
1194# We received today, Monday, September 12, 2011, notification that the
1195# changes to the Newfoundland Standard Time Act have been proclaimed.
1196# The change in the Act stipulates that the change from Daylight Savings
1197# Time to Standard Time and from Standard Time to Daylight Savings Time
1198# now occurs at 2:00AM.
1199# ...
1200# <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1201# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1202# </a>
1203# ...
1204# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1205# Office of the Chief Information Officer
1206# Executive Council
1207# Government of Newfoundland & Labrador
1208
1209Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1210Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1211Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1212Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1213Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1214Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1215#
1216# St John's has an apostrophe, but Posix file names can't have apostrophes.
1217# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1218Zone America/St_Johns -3:30:52 - LMT 1884
1219 -3:30:52 StJohns N%sT 1918
1220 -3:30:52 Canada N%sT 1919
1221 -3:30:52 StJohns N%sT 1935 Mar 30
1222 -3:30 StJohns N%sT 1942 May 11
1223 -3:30 Canada N%sT 1946
1224 -3:30 StJohns N%sT 2011 Nov
1225 -3:30 Canada N%sT
1226
1227# most of east Labrador
1228
1229# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1230# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1231Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1232 -3:30:52 - NST 1918
1233 -3:30:52 Canada N%sT 1919
1234 -3:30:52 - NST 1935 Mar 30
1235 -3:30 - NST 1936
1236 -3:30 StJohns N%sT 1942 May 11
1237 -3:30 Canada N%sT 1946
1238 -3:30 StJohns N%sT 1966 Mar 15 2:00
1239 -4:00 StJohns A%sT 2011 Nov
1240 -4:00 Canada A%sT
1241
1242
1243# west Labrador, Nova Scotia, Prince Edward I
1244
1245# From Paul Eggert (2006-03-22):
1246# Shanks & Pottenger write that since 1970 most of this region has been like
1247# Halifax. Many locales did not observe peacetime DST until 1972;
1248# Glace Bay, NS is the largest that we know of.
1249# Shanks & Pottenger also write that Liverpool, NS was the only town
1250# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1251# this is a typo.
1252
1253# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1254Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1255Rule Halifax 1916 only - Oct 1 0:00 0 S
1256Rule Halifax 1920 only - May 9 0:00 1:00 D
1257Rule Halifax 1920 only - Aug 29 0:00 0 S
1258Rule Halifax 1921 only - May 6 0:00 1:00 D
1259Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1260Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1261Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1262Rule Halifax 1923 only - Sep 4 0:00 0 S
1263Rule Halifax 1924 only - Sep 15 0:00 0 S
1264Rule Halifax 1925 only - Sep 28 0:00 0 S
1265Rule Halifax 1926 only - May 16 0:00 1:00 D
1266Rule Halifax 1926 only - Sep 13 0:00 0 S
1267Rule Halifax 1927 only - May 1 0:00 1:00 D
1268Rule Halifax 1927 only - Sep 26 0:00 0 S
1269Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1270Rule Halifax 1928 only - Sep 9 0:00 0 S
1271Rule Halifax 1929 only - Sep 3 0:00 0 S
1272Rule Halifax 1930 only - Sep 15 0:00 0 S
1273Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1274Rule Halifax 1932 only - May 1 0:00 1:00 D
1275Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1276Rule Halifax 1933 only - Oct 2 0:00 0 S
1277Rule Halifax 1934 only - May 20 0:00 1:00 D
1278Rule Halifax 1934 only - Sep 16 0:00 0 S
1279Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1280Rule Halifax 1935 only - Sep 30 0:00 0 S
1281Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1282Rule Halifax 1936 only - Sep 14 0:00 0 S
1283Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1284Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1285Rule Halifax 1939 only - May 28 0:00 1:00 D
1286Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1287Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1288Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1289Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1290Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1291Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1292Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1293Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1294Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1295# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1296Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1297 -4:00 Halifax A%sT 1918
1298 -4:00 Canada A%sT 1919
1299 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1300 -4:00 Canada A%sT 1946
1301 -4:00 Halifax A%sT 1974
1302 -4:00 Canada A%sT
1303Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1304 -4:00 Canada A%sT 1953
1305 -4:00 Halifax A%sT 1954
1306 -4:00 - AST 1972
1307 -4:00 Halifax A%sT 1974
1308 -4:00 Canada A%sT
1309
1310# New Brunswick
1311
1312# From Paul Eggert (2007-01-31):
1313# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1314# says they changed at 00:01 through 2006, and
1315# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1316# clear that this was the case since at least 1993.
1317# For now, assume it started in 1993.
1318
1319# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1320Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1321Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1322Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1323Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1324Rule Moncton 1939 only - May 27 1:00 1:00 D
1325Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1326Rule Moncton 1940 only - May 19 1:00 1:00 D
1327Rule Moncton 1941 only - May 4 1:00 1:00 D
1328Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1329Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1330Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1331Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1332Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1333# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1334Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1335 -5:00 - EST 1902 Jun 15
1336 -4:00 Canada A%sT 1933
1337 -4:00 Moncton A%sT 1942
1338 -4:00 Canada A%sT 1946
1339 -4:00 Moncton A%sT 1973
1340 -4:00 Canada A%sT 1993
1341 -4:00 Moncton A%sT 2007
1342 -4:00 Canada A%sT
1343
1344# Quebec
1345
1346# From Paul Eggert (2013-08-30):
1347# Since 1970 most of Quebec has been like Toronto.
1348# However, because earlier versions of the tz database mistakenly relied on data
1349# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1350# a separate entry was created for most of Quebec. We're loath to lose
1351# its pre-1970 info, even though the tz database is normally limited to
1352# zones that differ after 1970, so keep this otherwise out-of-scope entry.
1353
1354# Matthews and Vincent (1998) also write that Quebec east of the -63
1355# meridian is supposed to observe AST, but residents as far east as
1356# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1357# The Quebec department of justice writes in
1358# "The situation in Minganie and Basse-Cote-Nord"
1359# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1360# that the coastal strip from just east of Natashquan to Blanc-Sablon
1361# observes Atlantic standard time all year round.
1362# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1363# says this common practice was codified into law as of 2007.
1364# For lack of better info, guess this practice began around 1970, contra to
1365# Shanks & Pottenger who have this region observing AST/ADT.
1366# for post-1970 data America/Puerto_Rico.
1367
1368# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1369Rule Mont 1917 only - Mar 25 2:00 1:00 D
1370Rule Mont 1917 only - Apr 24 0:00 0 S
1371Rule Mont 1919 only - Mar 31 2:30 1:00 D
1372Rule Mont 1919 only - Oct 25 2:30 0 S
1373Rule Mont 1920 only - May 2 2:30 1:00 D
1374Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1375Rule Mont 1921 only - May 1 2:00 1:00 D
1376Rule Mont 1922 only - Apr 30 2:00 1:00 D
1377Rule Mont 1924 only - May 17 2:00 1:00 D
1378Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1379Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1380# The 1927-to-1937 rules can be expressed more simply as
1381# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1382# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1383# The rules below avoid use of 24:00
1384# (which pre-1998 versions of zic cannot handle).
1385Rule Mont 1927 only - May 1 0:00 1:00 D
1386Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1387Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1388Rule Mont 1932 only - May 1 0:00 1:00 D
1389Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1390Rule Mont 1933 only - Oct 1 0:00 0 S
1391Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1392Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1393Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1394Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1395Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1396Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1397
1398# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1399Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1400 -4:00 Canada A%sT 1970
1401 -4:00 - AST
1402Zone America/Montreal -4:54:16 - LMT 1884
1403 -5:00 Mont E%sT 1918
1404 -5:00 Canada E%sT 1919
1405 -5:00 Mont E%sT 1942 Feb 9 2:00s
1406 -5:00 Canada E%sT 1946
1407 -5:00 Mont E%sT 1974
1408 -5:00 Canada E%sT
1409
1410# Ontario
1411
1412# From Paul Eggert (2006-07-09):
1413# Shanks & Pottenger write that since 1970 most of Ontario has been like
1414# Toronto.
1415# Thunder Bay skipped DST in 1973.
1416# Many smaller locales did not observe peacetime DST until 1974;
1417# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1418# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1419
1420# From Mark Brader (2003-07-26):
1421# [According to the Toronto Star] Orillia, Ontario, adopted DST
1422# effective Saturday, 1912-06-22, 22:00; the article mentions that
1423# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1424# have already done so. In Orillia DST was to run until Saturday,
1425# 1912-08-31 (no time mentioned), but it was met with considerable
1426# hostility from certain segments of the public, and was revoked after
1427# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1428# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1429# earlier in June).
1430#
1431# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1432
1433# From Paul Eggert (1997-10-17):
1434# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1435# says that Atikokan, Ontario currently does not observe DST,
1436# but will vote on 11-10 whether to use EST/EDT.
1437# He also writes that the
1438# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1439# Ontario Time Act (1990, Chapter T.9)
1440# </a>
1441# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1442# Officially Atikokan is therefore on CST/CDT, and most likely this report
1443# concerns a non-official time observed as a matter of local practice.
1444#
1445# From Paul Eggert (2000-10-02):
1446# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1447# New Osnaburgh observe CST all year, that Big Trout Lake observes
1448# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1449# violation of the official Ontario rules.
1450#
1451# From Paul Eggert (2006-07-09):
1452# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1453# 2005-07-21 Chronicle-Journal, which said:
1454#
1455# The clocks in Atikokan stay set on standard time year-round.
1456# This means they spend about half the time on central time and
1457# the other half on eastern time.
1458#
1459# For the most part, the system works, Mayor Dennis Brown said.
1460#
1461# "The majority of businesses in Atikokan deal more with Eastern
1462# Canada, but there are some that deal with Western Canada," he
1463# said. "I don't see any changes happening here."
1464#
1465# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1466# [New Osnaburgh] follow the same practice."
1467
1468# From Garry McKinnon (2006-07-14) via Chris Walton:
1469# I chatted with a member of my board who has an outstanding memory
1470# and a long history in Atikokan (and in the telecom industry) and he
1471# can say for certain that Atikokan has been practicing the current
1472# time keeping since 1952, at least.
1473
1474# From Paul Eggert (2006-07-17):
1475# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1476# ever since standard time was introduced, but the information from
1477# McKinnon sounds more authoritative. For now, assume that Atikokan
1478# switched to EST immediately after WWII era daylight saving time
1479# ended. This matches the old (less-populous) America/Coral_Harbour
1480# entry since our cutoff date of 1970, so we can move
1481# America/Coral_Harbour to the 'backward' file.
1482
1483# From Mark Brader (2010-03-06):
1484#
1485# Currently the database has:
1486#
1487# # Ontario
1488#
1489# # From Paul Eggert (2006-07-09):
1490# # Shanks & Pottenger write that since 1970 most of Ontario has been like
1491# # Toronto.
1492# # Thunder Bay skipped DST in 1973.
1493# # Many smaller locales did not observe peacetime DST until 1974;
1494# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1495#
1496# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1497# right corner of page 1, it says that Toronto will return to standard
1498# time at 2 am Sunday morning (which agrees with the database), and that:
1499#
1500# The one-hour setback will go into effect throughout most of Ontario,
1501# except in areas like Windsor which remains on standard time all year.
1502#
1503# Windsor is, of course, a lot larger than Nipigon.
1504#
1505# I only came across this incidentally. I don't know if Windsor began
1506# observing DST when Detroit did, or in 1974, or on some other date.
1507#
1508# By the way, the article continues by noting that:
1509#
1510# Some cities in the United States have pushed the deadline back
1511# three weeks and will change over from daylight saving in October.
1512
1513# From Arthur David Olson (2010-07-17):
1514#
1515# "Standard Time and Time Zones in Canada" appeared in
1516# The Journal of The Royal Astronomical Society of Canada,
1517# volume 26, number 2 (February 1932) and, as of 2010-07-17,
1518# was available at
1519# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1520# http://adsabs.harvard.edu/full/1932JRASC..26...49S
1521# </a>
1522#
1523# It includes the text below (starting on page 57):
1524#
1525# A list of the places in Canada using daylight saving time would
1526# require yearly revision. From information kindly furnished by
1527# the provincial governments and by the postmasters in many cities
1528# and towns, it is found that the following places used daylight sav-
1529# ing in 1930. The information for the province of Quebec is definite,
1530# for the other provinces only approximate:
1531#
1532# Province Daylight saving time used
1533# Prince Edward Island Not used.
1534# Nova Scotia In Halifax only.
1535# New Brunswick In St. John only.
1536# Quebec In the following places:
1537# Montreal Lachine
1538# Quebec Mont-Royal
1539# Levis Iberville
1540# St. Lambert Cap de la Madeleine
1541# Verdun Loretteville
1542# Westmount Richmond
1543# Outremont St. Jerome
1544# Longueuil Greenfield Park
1545# Arvida Waterloo
1546# Chambly-Canton Beaulieu
1547# Melbourne La Tuque
1548# St. Theophile Buckingham
1549# Ontario Used generally in the cities and towns along
1550# the southerly part of the province. Not
1551# used in the northwesterlhy part.
1552# Manitoba Not used.
1553# Saskatchewan In Regina only.
1554# Alberta Not used.
1555# British Columbia Not used.
1556#
1557# With some exceptions, the use of daylight saving may be said to be limited
1558# to those cities and towns lying between Quebec city and Windsor, Ont.
1559
1560# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1561Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1562Rule Toronto 1919 only - Oct 26 0:00 0 S
1563Rule Toronto 1920 only - May 2 2:00 1:00 D
1564Rule Toronto 1920 only - Sep 26 0:00 0 S
1565Rule Toronto 1921 only - May 15 2:00 1:00 D
1566Rule Toronto 1921 only - Sep 15 2:00 0 S
1567Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1568# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1569# was meant.
1570Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1571Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1572# The 1927-to-1939 rules can be expressed more simply as
1573# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1574# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1575# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1576# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1577# The rules below avoid use of Sun>=25
1578# (which pre-2004 versions of zic cannot handle).
1579Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1580Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1581Rule Toronto 1932 only - May 1 2:00 1:00 D
1582Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1583Rule Toronto 1933 only - Oct 1 2:00 0 S
1584Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1585Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1586Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1587Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1588Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1589Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1590Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1591Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1592Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1593# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1594# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1595# is wrong, and that he had confirmed it by checking the 1971-10-30
1596# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1597Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1598
1599# From Paul Eggert (2003-07-27):
1600# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1601# Port Arthur, Ontario, the principle of the Bill has been in
1602# operation for the past three years, and in the City of Moose Jaw,
1603# Saskatchewan, for one year."
1604
1605# From David Bryan via Tory Tronrud, Director/Curator,
1606# Thunder Bay Museum (2003-11-12):
1607# There is some suggestion, however, that, by-law or not, daylight
1608# savings time was being practiced in Fort William and Port Arthur
1609# before 1909.... [I]n 1910, the line between the Eastern and Central
1610# Time Zones was permanently moved about two hundred miles west to
1611# include the Thunder Bay area.... When Canada adopted daylight
1612# savings time in 1916, Fort William and Port Arthur, having done so
1613# already, did not change their clocks.... During the Second World
1614# War,... [t]he cities agreed to implement DST during the summer
1615# months for the remainder of the war years.
1616
1617# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1618Zone America/Toronto -5:17:32 - LMT 1895
1619 -5:00 Canada E%sT 1919
1620 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1621 -5:00 Canada E%sT 1946
1622 -5:00 Toronto E%sT 1974
1623 -5:00 Canada E%sT
1624Zone America/Thunder_Bay -5:57:00 - LMT 1895
1625 -6:00 - CST 1910
1626 -5:00 - EST 1942
1627 -5:00 Canada E%sT 1970
1628 -5:00 Toronto E%sT 1973
1629 -5:00 - EST 1974
1630 -5:00 Canada E%sT
1631Zone America/Nipigon -5:53:04 - LMT 1895
1632 -5:00 Canada E%sT 1940 Sep 29
1633 -5:00 1:00 EDT 1942 Feb 9 2:00s
1634 -5:00 Canada E%sT
1635Zone America/Rainy_River -6:18:16 - 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
1639Zone America/Atikokan -6:06:28 - LMT 1895
1640 -6:00 Canada C%sT 1940 Sep 29
1641 -6:00 1:00 CDT 1942 Feb 9 2:00s
1642 -6:00 Canada C%sT 1945 Sep 30 2:00
1643 -5:00 - EST
1644
1645
1646# Manitoba
1647
1648# From Rob Douglas (2006-04-06):
1649# the old Manitoba Time Act - as amended by Bill 2, assented to
1650# March 27, 1987 ... said ...
1651# "between two o'clock Central Standard Time in the morning of
1652# the first Sunday of April of each year and two o'clock Central
1653# Standard Time in the morning of the last Sunday of October next
1654# following, one hour in advance of Central Standard Time."...
1655# I believe that the English legislation [of the old time act] had =
1656# been assented to (March 22, 1967)....
1657# Also, as far as I can tell, there was no order-in-council varying
1658# the time of Daylight Saving Time for 2005 and so the provisions of
1659# the 1987 version would apply - the changeover was at 2:00 Central
1660# Standard Time (i.e. not until 3:00 Central Daylight Time).
1661
1662# From Paul Eggert (2006-04-10):
1663# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1664# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1665# it was also 02:00s in 1966.
1666
1667# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1668Rule Winn 1916 only - Apr 23 0:00 1:00 D
1669Rule Winn 1916 only - Sep 17 0:00 0 S
1670Rule Winn 1918 only - Apr 14 2:00 1:00 D
1671Rule Winn 1918 only - Oct 27 2:00 0 S
1672Rule Winn 1937 only - May 16 2:00 1:00 D
1673Rule Winn 1937 only - Sep 26 2:00 0 S
1674Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1675Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1676Rule Winn 1945 only - Sep lastSun 2:00 0 S
1677Rule Winn 1946 only - May 12 2:00 1:00 D
1678Rule Winn 1946 only - Oct 13 2:00 0 S
1679Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1680Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1681Rule Winn 1950 only - May 1 2:00 1:00 D
1682Rule Winn 1950 only - Sep 30 2:00 0 S
1683Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1684Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1685Rule Winn 1959 only - Oct lastSun 2:00 0 S
1686Rule Winn 1960 only - Sep lastSun 2:00 0 S
1687Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1688Rule Winn 1963 only - Sep 22 2:00 0 S
1689Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1690Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1691Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1692# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1693Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1694 -6:00 Winn C%sT 2006
1695 -6:00 Canada C%sT
1696
1697
1698# Saskatchewan
1699
1700# From Mark Brader (2003-07-26):
1701# The first actual adoption of DST in Canada was at the municipal
1702# level. As the [Toronto] Star put it (1912-06-07), "While people
1703# elsewhere have long been talking of legislation to save daylight,
1704# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1705# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1706# presumably late evening, as below), and would run until "the end of
1707# the summer". The discrepancy between municipal time and railroad
1708# time was noted.
1709
1710# From Paul Eggert (2003-07-27):
1711# Willett (1914-03) notes that DST "has been in operation ... in the
1712# City of Moose Jaw, Saskatchewan, for one year."
1713
1714# From Paul Eggert (2006-03-22):
1715# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1716# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1717# Other western towns (e.g. Lloydminster) are like Edmonton.
1718# Matthews and Vincent (1998) write that Denare Beach and Creighton
1719# are like Winnipeg, in violation of Saskatchewan law.
1720
1721# From W. Jones (1992-11-06):
1722# The. . .below is based on information I got from our law library, the
1723# provincial archives, and the provincial Community Services department.
1724# A precise history would require digging through newspaper archives, and
1725# since you didn't say what you wanted, I didn't bother.
1726#
1727# Saskatchewan is split by a time zone meridian (105W) and over the years
1728# the boundary became pretty ragged as communities near it reevaluated
1729# their affiliations in one direction or the other. In 1965 a provincial
1730# referendum favoured legislating common time practices.
1731#
1732# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1733# Saskatchewan 1978) was proclaimed, and established that the eastern
1734# part of Saskatchewan would use CST year round, that districts in
1735# northwest Saskatchewan would by default follow CST but could opt to
1736# follow Mountain Time rules (thus 1 hour difference in the winter and
1737# zero in the summer), and that districts in southwest Saskatchewan would
1738# by default follow MT but could opt to follow CST.
1739#
1740# It took a few years for the dust to settle (I know one story of a town
1741# on one time zone having its school in another, such that a mom had to
1742# serve her family lunch in two shifts), but presently it seems that only
1743# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1744# rules any more; all other districts appear to have used CST year round
1745# since sometime in the 1960s.
1746
1747# From Chris Walton (2006-06-26):
1748# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1749# long and rather painful to read.
1750# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1751
1752# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1753Rule Regina 1918 only - Apr 14 2:00 1:00 D
1754Rule Regina 1918 only - Oct 27 2:00 0 S
1755Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1756Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1757Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1758Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1759Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1760Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1761Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1762Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1763Rule Regina 1945 only - Sep lastSun 2:00 0 S
1764Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1765Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1766Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1767Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1768Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1769Rule Regina 1959 only - Oct lastSun 2:00 0 S
1770#
1771Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1772Rule Swift 1957 only - Oct lastSun 2:00 0 S
1773Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1774Rule Swift 1959 only - Oct lastSun 2:00 0 S
1775Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1776# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1777Zone America/Regina -6:58:36 - LMT 1905 Sep
1778 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1779 -6:00 - CST
1780Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1781 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1782 -7:00 Regina M%sT 1950
1783 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1784 -6:00 - CST
1785
1786
1787# Alberta
1788
1789# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1790Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1791Rule Edm 1918 only - Oct 27 2:00 0 S
1792Rule Edm 1919 only - May 27 2:00 0 S
1793Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1794Rule Edm 1920 only - Oct lastSun 2:00 0 S
1795Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1796Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1797Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1798Rule Edm 1945 only - Sep lastSun 2:00 0 S
1799Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1800Rule Edm 1947 only - Sep lastSun 2:00 0 S
1801Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1802Rule Edm 1967 only - Oct lastSun 2:00 0 S
1803Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1804Rule Edm 1969 only - Oct lastSun 2:00 0 S
1805Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1806Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1807# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1808Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1809 -7:00 Edm M%sT 1987
1810 -7:00 Canada M%sT
1811
1812
1813# British Columbia
1814
1815# From Paul Eggert (2006-03-22):
1816# Shanks & Pottenger write that since 1970 most of this region has
1817# been like Vancouver.
1818# Dawson Creek uses MST. Much of east BC is like Edmonton.
1819# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1820
1821# It seems though that (re: Creston) is not entirely correct:
1822
1823# From Chris Walton (2011-12-01):
1824# There are two areas within the Canadian province of British Columbia
1825# that do not currently observe daylight saving:
1826# a) The Creston Valley (includes the town of Creston and surrounding area)
1827# b) The eastern half of the Peace River Regional District
1828# (includes the cities of Dawson Creek and Fort St. John)
1829
1830# Earlier this year I stumbled across a detailed article about the time
1831# keeping history of Creston; it was written by Tammy Hardwick who is the
1832# manager of the Creston & District Museum. The article was written in May 2009.
1833# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1834# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1835# </a>
1836# According to the article, Creston has not changed its clocks since June 1918.
1837# i.e. Creston has been stuck on UTC-7 for 93 years.
1838# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1839
1840# Unfortunately the exact date for the time change in June 1918 remains
1841# unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1842# ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1843# as plausible as any other date (in June). She also said that after writing the
1844# article she had discovered another time change in 1916; this is the subject
1845# of another article which she wrote in October 2010.
1846# <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1847# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1848# </a>
1849
1850# Here is a summary of the three clock change events in Creston's history:
1851# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1852# Exact date unknown
1853# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1854# Exact date in October unknown; Sunday October 1 is a reasonable guess.
1855# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1856# Exact date in June unknown; Sunday June 2 is a reasonable guess.
1857# note#1:
1858# On Oct 27/1918 when daylight saving ended in the rest of Canada,
1859# Creston did not change its clocks.
1860# note#2:
1861# During WWII when the Federal Government legislated a mandatory clock change,
1862# Creston did not oblige.
1863# note#3:
1864# There is no guarantee that Creston will remain on Mountain Standard Time
1865# (UTC-7) forever.
1866# The subject was debated at least once this year by the town Council.
1867# <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1868# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1869# </a>
1870
1871# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1872# In Creston, that was handled by shifting the area to PST (-8:00) then applying
1873# summer time to cause the offset to be -7:00, the same as it had been before
1874# the change. It can be argued that the timezone abbreviation during this
1875# period should be PDT rather than MST, but that doesn't seem important enough
1876# (to anyone) to further complicate the rules.
1877
1878# The transition dates (and times) are guesses.
1879
1880# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1881Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1882Rule Vanc 1918 only - Oct 27 2:00 0 S
1883Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1884Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1885Rule Vanc 1945 only - Sep 30 2:00 0 S
1886Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1887Rule Vanc 1946 only - Oct 13 2:00 0 S
1888Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1889Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1890# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1891Zone America/Vancouver -8:12:28 - LMT 1884
1892 -8:00 Vanc P%sT 1987
1893 -8:00 Canada P%sT
1894Zone America/Dawson_Creek -8:00:56 - LMT 1884
1895 -8:00 Canada P%sT 1947
1896 -8:00 Vanc P%sT 1972 Aug 30 2:00
1897 -7:00 - MST
1898Zone America/Creston -7:46:04 - LMT 1884
1899 -7:00 - MST 1916 Oct 1
1900 -8:00 - PST 1918 Jun 2
1901 -7:00 - MST
1902
1903# Northwest Territories, Nunavut, Yukon
1904
1905# From Paul Eggert (2006-03-22):
1906# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1907# Mathew Englander (1996-10-07) gives the following refs:
1908# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1909# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1910# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1911# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1912# * O.I.C. 1980/02 established DST.
1913# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1914# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1915# with Englander.
1916# From Chris Walton (2006-06-26):
1917# Here is a link to the old daylight saving portion of the interpretation
1918# act which was last updated in 1987:
1919# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1920
1921# From Rives McDow (1999-09-04):
1922# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1923# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1924# Nunavut moves to single time zone Oct. 31
1925# </a>
1926#
1927# From Antoine Leca (1999-09-06):
1928# We then need to create a new timezone for the Kitikmeot region of Nunavut
1929# to differentiate it from the Yellowknife region.
1930
1931# From Paul Eggert (1999-09-20):
1932# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1933# Basic Facts: The New Territory
1934# </a> (1999) reports that Pangnirtung operates on eastern time,
1935# and that Coral Harbour does not observe DST. We don't know when
1936# Pangnirtung switched to eastern time; we'll guess 1995.
1937
1938# From Rives McDow (1999-11-08):
1939# On October 31, when the rest of Nunavut went to Central time,
1940# Pangnirtung wobbled. Here is the result of their wobble:
1941#
1942# The following businesses and organizations in Pangnirtung use Central Time:
1943#
1944# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1945# Eastern Arctic National Parks, A & D Specialist
1946#
1947# The following businesses and organizations in Pangnirtung use Eastern Time:
1948#
1949# Hamlet office, All other businesses, Both schools, Airport operator
1950#
1951# This has made for an interesting situation there, which warranted the news.
1952# No one there that I spoke with seems concerned, or has plans to
1953# change the local methods of keeping time, as it evidently does not
1954# really interfere with any activities or make things difficult locally.
1955# They plan to celebrate New Year's turn-over twice, one hour apart,
1956# so it appears that the situation will last at least that long.
1957# The Nunavut Intergovernmental Affairs hopes that they will "come to
1958# their senses", but the locals evidently don't see any problem with
1959# the current state of affairs.
1960
1961# From Michaela Rodrigue, writing in the
1962# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1963# Nunatsiaq News (1999-11-19)</a>:
1964# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1965# central - or Nunavut time - for government offices, and eastern time
1966# for municipal offices and schools.... Igloolik [was similar but then]
1967# made the switch to central time on Saturday, Nov. 6.
1968
1969# From Paul Eggert (2000-10-02):
1970# Matthews and Vincent (1998) say the following, but we lack histories
1971# for these potential new Zones.
1972#
1973# The Canadian Forces station at Alert uses Eastern Time while the
1974# handful of residents at the Eureka weather station [in the Central
1975# zone] skip daylight savings. Baffin Island, which is crossed by the
1976# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1977# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1978# Central Time and Southampton Island [in the Central zone] is not
1979# required to use daylight savings.
1980
1981# From
1982# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1983# Nunavut now has two time zones
1984# </a> (2000-11-10):
1985# The Nunavut government would allow its employees in Kugluktuk and
1986# Cambridge Bay to operate on central time year-round, putting them
1987# one hour behind the rest of Nunavut for six months during the winter.
1988# At the end of October the two communities had rebelled against
1989# Nunavut's unified time zone, refusing to shift to eastern time with
1990# the rest of the territory for the winter. Cambridge Bay remained on
1991# central time, while Kugluktuk, even farther west, reverted to
1992# mountain time, which they had used before the advent of Nunavut's
1993# unified time zone in 1999.
1994#
1995# From Rives McDow (2001-01-20), quoting the Nunavut government:
1996# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1997
1998# From Paul Eggert (2000-12-04):
1999# Let's just keep track of the official times for now.
2000
2001# From Rives McDow (2001-03-07):
2002# The premier of Nunavut has issued a ministerial statement advising
2003# that effective 2001-04-01, the territory of Nunavut will revert
2004# back to three time zones (mountain, central, and eastern). Of the
2005# cities in Nunavut, Coral Harbor is the only one that I know of that
2006# has said it will not observe dst, staying on EST year round. I'm
2007# checking for more info, and will get back to you if I come up with
2008# more.
2009# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2010
2011# From Gwillim Law (2005-05-21):
2012# According to maps at
2013# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2014# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2015# (both dated 2003), and
2016# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2017# (from a 1998 Canadian Geographic article), the de facto and de jure time
2018# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2019# round. Using Google, it's easy to find other websites that confirm this.
2020# I wasn't able to find how far back this time regimen goes, but since it
2021# predates the creation of Nunavut, it probably goes back many years....
2022# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2023#
2024# From Paul Eggert (2005-07-26):
2025# For lack of better information, assume that Southampton Island observed
2026# daylight saving only during wartime.
2027
2028# From Chris Walton (2007-03-01):
2029# ... the community of Resolute (located on Cornwallis Island in
2030# Nunavut) moved from Central Time to Eastern Time last November.
2031# Basically the community did not change its clocks at the end of
2032# daylight saving....
2033# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2034
2035# From Chris Walton (2011-03-21):
2036# Back in 2007 I initiated the creation of a new "zone file" for Resolute
2037# Bay. Resolute Bay is a small community located about 900km north of
2038# the Arctic Circle. The zone file was required because Resolute Bay had
2039# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2040#
2041# According to new information which I received last week, Resolute Bay
2042# went back to using UTC-6 in the winter of 2007-2008...
2043#
2044# On March 11/2007 most of Canada went onto daylight saving. On March
2045# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2046# talked to somebody that was both knowledgeable and helpful. I was able
2047# to confirm that Resolute Bay was still operating on UTC-5. It was
2048# explained to me that Resolute Bay had been on the Eastern Time zone
2049# (EST) in the winter, and was now back on the Central Time zone (CDT).
2050# i.e. the time zone had changed twice in the last year but the clocks
2051# had not moved. The residents had to know which time zone they were in
2052# so they could follow the correct TV schedule...
2053#
2054# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2055# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2056# of the phone call, I decided to seek out an alternate source of
2057# information. I found an e-mail address for somebody by the name of
2058# Stephanie Adams whose job was listed as "Inns North Support Officer for
2059# Arctic Co-operatives." I was under the impression that Stephanie lived
2060# and worked in Resolute Bay...
2061#
2062# On March 14/2011 I phoned the hamlet office again. I was told that
2063# Resolute Bay had been using Central Standard Time over the winter of
2064# 2010-2011 and that the clocks had therefore been moved one hour ahead
2065# on March 13/2011. The person I talked to was aware that Resolute Bay
2066# had previously experimented with Eastern Standard Time but he could not
2067# tell me when the practice had stopped.
2068#
2069# On March 17/2011 I searched the Web to find an e-mail address of
2070# somebody that might be able to tell me exactly when Resolute Bay went
2071# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2072# used to be the mayor of Resolute Bay and he apparently owns half the
2073# businesses including "South Camp Inn." This website has some info on
2074# Aziz:
2075# <a href="http://www.uphere.ca/node/493">
2076# http://www.uphere.ca/node/493
2077# </a>
2078#
2079# I sent Aziz an e-mail asking when Resolute Bay had stopped using
2080# Eastern Standard Time.
2081#
2082# Aziz responded quickly with this: "hi, The time was not changed for the
2083# 1 year only, the following year, the community went back to the old way
2084# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2085# the winter Zulu plus 6 hrs"
2086#
2087# This of course conflicted with everything I had ascertained in November 2008.
2088#
2089# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2090# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2091# may want to check with the weather office in Resolute Bay or do a
2092# search on the weather through Env. Canada. web site"
2093#
2094# If I had realized the Stephanie did not live in Resolute Bay I would
2095# never have contacted her. I now believe that all the information I
2096# obtained in November 2008 should be ignored...
2097# I apologize for reporting incorrect information in 2008.
2098
2099# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2100Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2101Rule NT_YK 1918 only - Oct 27 2:00 0 S
2102Rule NT_YK 1919 only - May 25 2:00 1:00 D
2103Rule NT_YK 1919 only - Nov 1 0:00 0 S
2104Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2105Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2106Rule NT_YK 1945 only - Sep 30 2:00 0 S
2107Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2108Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2109Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2110Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2111Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2112# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2113# aka Panniqtuuq
2114Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2115 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2116 -5:00 Canada E%sT 1999 Oct 31 2:00
2117 -6:00 Canada C%sT 2000 Oct 29 2:00
2118 -5:00 Canada E%sT
2119# formerly Frobisher Bay
2120Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2121 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2122 -6:00 Canada C%sT 2000 Oct 29 2:00
2123 -5:00 Canada E%sT
2124# aka Qausuittuq
2125Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute 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 2006 Oct 29 2:00
2129 -5:00 - EST 2007 Mar 11 3:00
2130 -6:00 Canada C%sT
2131# aka Kangiqiniq
2132Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2133 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2134 -5:00 - EST 2001 Apr 1 3:00
2135 -6:00 Canada C%sT
2136# aka Iqaluktuuttiaq
2137Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2138 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2139 -6:00 Canada C%sT 2000 Oct 29 2:00
2140 -5:00 - EST 2000 Nov 5 0:00
2141 -6:00 - CST 2001 Apr 1 3:00
2142 -7:00 Canada M%sT
2143Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2144 -7:00 NT_YK M%sT 1980
2145 -7:00 Canada M%sT
2146Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2147 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2148 -7:00 NT_YK M%sT 1980
2149 -7:00 Canada M%sT
2150Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2151 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2152 -8:00 NT_YK P%sT 1980
2153 -8:00 Canada P%sT
2154Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2155 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2156 -8:00 NT_YK P%sT 1980
2157 -8:00 Canada P%sT
2158
2159
2160###############################################################################
2161
2162# Mexico
2163
2164# From Paul Eggert (2001-03-05):
2165# The Investigation and Analysis Service of the
2166# Mexican Library of Congress (MLoC) has published a
2167# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2168# history of Mexican local time (in Spanish)
2169# </a>.
2170#
2171# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2172# (In all cases we go with the MLoC.)
2173# S&P report that Baja was at -8:00 in 1922/1923.
2174# S&P say the 1930 transition in Baja was 1930-11-16.
2175# S&P report no DST during summer 1931.
2176# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2177
2178# From Gwillim Law (2001-02-20):
2179# There are some other discrepancies between the Decrees page and the
2180# tz database. I think they can best be explained by supposing that
2181# the researchers who prepared the Decrees page failed to find some of
2182# the relevant documents.
2183
2184# From Alan Perry (1996-02-15):
2185# A guy from our Mexico subsidiary finally found the Presidential Decree
2186# outlining the timezone changes in Mexico.
2187#
2188# ------------- Begin Forwarded Message -------------
2189#
2190# I finally got my hands on the Official Presidential Decree that sets up the
2191# rules for the DST changes. The rules are:
2192#
2193# 1. The country is divided in 3 timezones:
2194# - Baja California Norte (the Mexico/BajaNorte TZ)
2195# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2196# - The rest of the country (the Mexico/General TZ)
2197#
2198# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2199# at 2:00 AM, the times in each zone are as follows:
2200# BajaNorte: GMT+7
2201# BajaSur: GMT+6
2202# General: GMT+5
2203#
2204# 3. The rest of the year, the times are as follows:
2205# BajaNorte: GMT+8
2206# BajaSur: GMT+7
2207# General: GMT+6
2208#
2209# The Decree was published in Mexico's Official Newspaper on January 4th.
2210#
2211# -------------- End Forwarded Message --------------
2212# From Paul Eggert (1996-06-12):
2213# For an English translation of the decree, see
2214# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2215# "Diario Oficial: Time Zone Changeover" (1996-01-04).
2216# </a>
2217
2218# From Rives McDow (1998-10-08):
2219# The State of Quintana Roo has reverted back to central STD and DST times
2220# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2221
2222# From Rives McDow (2000-01-10):
2223# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2224# zone 5 hours from the International Date Line, and will not observe daylight
2225# savings time so as to stay on the same time zone as the southern part of
2226# Arizona year round.
2227
2228# From Jesper Norgaard, translating
2229# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2230# In Oaxaca, the 55.000 teachers from the Section 22 of the National
2231# Syndicate of Education Workers, refuse to apply daylight saving each
2232# year, so that the more than 10,000 schools work at normal hour the
2233# whole year.
2234
2235# From Gwillim Law (2001-01-19):
2236# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2237# (translated):...
2238# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2239# that Summer Time will be reduced from seven to five months, starting
2240# this year....
2241# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2242# [translated], says "summer time will ... take effect on the first Sunday
2243# in May, and end on the last Sunday of September.
2244
2245# From Arthur David Olson (2001-01-25):
2246# The 2001-01-24 traditional Washington Post contained the page one
2247# story "Timely Issue Divides Mexicans."...
2248# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2249# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2250# Mexico City and its 20 million residents on a different time than
2251# the rest of the country..." In particular, Lopez Obrador would abolish
2252# observation of Daylight Saving Time.
2253
2254# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2255# Official statute published by the Energy Department
2256# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2257# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2258
2259# From Paul Eggert (2001-03-03):
2260#
2261# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2262# James F. Smith writes in today's LA Times
2263# </a>
2264# * Sonora will continue to observe standard time.
2265# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2266# the Federal District will not adopt DST.
2267# * 4 of 16 district leaders announced they'll ignore the decree.
2268# * The decree does not affect federal-controlled facilities including
2269# the airport, banks, hospitals, and schools.
2270#
2271# For now we'll assume that the Federal District will bow to federal rules.
2272
2273# From Jesper Norgaard (2001-04-01):
2274# I found some references to the Mexican application of daylight
2275# saving, which modifies what I had already sent you, stating earlier
2276# that a number of northern Mexican states would go on daylight
2277# saving. The modification reverts this to only cover Baja California
2278# (Norte), while all other states (except Sonora, who has no daylight
2279# saving all year) will follow the original decree of president
2280# Vicente Fox, starting daylight saving May 6, 2001 and ending
2281# September 30, 2001.
2282# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2283# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2284
2285# From Reuters (2001-09-04):
2286# Mexico's Supreme Court on Tuesday declared that daylight savings was
2287# unconstitutional in Mexico City, creating the possibility the
2288# capital will be in a different time zone from the rest of the nation
2289# next year.... The Supreme Court's ruling takes effect at 2:00
2290# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2291# standard time. "This is so residents of the Federal District are not
2292# subject to unexpected time changes," a statement from the court said.
2293
2294# From Jesper Norgaard Welen (2002-03-12):
2295# ... consulting my local grocery store(!) and my coworkers, they all insisted
2296# that a new decision had been made to reinstate US style DST in Mexico....
2297# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2298# confirms this. Sonora as usual is the only state where DST is not applied.
2299
2300# From Steffen Thorsen (2009-12-28):
2301#
2302# Steffen Thorsen wrote:
2303# > Mexico's House of Representatives has approved a proposal for northern
2304# > Mexico's border cities to share the same daylight saving schedule as
2305# > the United States.
2306# Now this has passed both the Congress and the Senate, so starting from
2307# 2010, some border regions will be the same:
2308# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2309# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2310# </a>
2311# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2312# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2313# </a>
2314# (Spanish)
2315#
2316# Could not find the new law text, but the proposed law text changes are here:
2317# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2318# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2319# </a>
2320# (Gaceta Parlamentaria)
2321#
2322# There is also a list of the votes here:
2323# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2324# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2325# </a>
2326#
2327# Our page:
2328# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2329# http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2330# </a>
2331
2332# From Arthur David Olson (2010-01-20):
2333# The page
2334# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2335# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2336# </a>
2337# includes this text:
2338# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2339# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2340# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2341# Tamaulipas, la aplicación de este horario estacional surtirá efecto
2342# desde las dos horas del segundo domingo de marzo y concluirá a las dos
2343# horas del primer domingo de noviembre.
2344# En los municipios fronterizos que se encuentren ubicados en la franja
2345# fronteriza norte en el territorio comprendido entre la línea
2346# internacional y la línea paralela ubicada a una distancia de veinte
2347# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2348# interior del país, la aplicación de este horario estacional surtirá
2349# efecto desde las dos horas del segundo domingo de marzo y concluirá a
2350# las dos horas del primer domingo de noviembre.
2351
2352# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2353Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2354Rule Mexico 1939 only - Jun 25 0:00 0 S
2355Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2356Rule Mexico 1941 only - Apr 1 0:00 0 S
2357Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2358Rule Mexico 1944 only - May 1 0:00 0 S
2359Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2360Rule Mexico 1950 only - Jul 30 0:00 0 S
2361Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2362Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2363Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2364Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2365Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2366Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2367# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2368# Quintana Roo
2369Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2370 -6:00 - CST 1981 Dec 23
2371 -5:00 Mexico E%sT 1998 Aug 2 2:00
2372 -6:00 Mexico C%sT
2373# Campeche, Yucatan
2374Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2375 -6:00 - CST 1981 Dec 23
2376 -5:00 - EST 1982 Dec 2
2377 -6:00 Mexico C%sT
2378# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2379Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2380 -6:00 - CST 1988
2381 -6:00 US C%sT 1989
2382 -6:00 Mexico C%sT 2010
2383 -6:00 US C%sT
2384# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2385Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2386 -6:00 - CST 1988
2387 -6:00 US C%sT 1989
2388 -6:00 Mexico C%sT
2389# Central Mexico
2390Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2391 -7:00 - MST 1927 Jun 10 23:00
2392 -6:00 - CST 1930 Nov 15
2393 -7:00 - MST 1931 May 1 23:00
2394 -6:00 - CST 1931 Oct
2395 -7:00 - MST 1932 Apr 1
2396 -6:00 Mexico C%sT 2001 Sep 30 02:00
2397 -6:00 - CST 2002 Feb 20
2398 -6:00 Mexico C%sT
2399# Chihuahua (near US border)
2400Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2401 -7:00 - MST 1927 Jun 10 23:00
2402 -6:00 - CST 1930 Nov 15
2403 -7:00 - MST 1931 May 1 23:00
2404 -6:00 - CST 1931 Oct
2405 -7:00 - MST 1932 Apr 1
2406 -6:00 - CST 1996
2407 -6:00 Mexico C%sT 1998
2408 -6:00 - CST 1998 Apr Sun>=1 3:00
2409 -7:00 Mexico M%sT 2010
2410 -7:00 US M%sT
2411# Chihuahua (away from US border)
2412Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2413 -7:00 - MST 1927 Jun 10 23:00
2414 -6:00 - CST 1930 Nov 15
2415 -7:00 - MST 1931 May 1 23:00
2416 -6:00 - CST 1931 Oct
2417 -7:00 - MST 1932 Apr 1
2418 -6:00 - CST 1996
2419 -6:00 Mexico C%sT 1998
2420 -6:00 - CST 1998 Apr Sun>=1 3:00
2421 -7:00 Mexico M%sT
2422# Sonora
2423Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2424 -7:00 - MST 1927 Jun 10 23:00
2425 -6:00 - CST 1930 Nov 15
2426 -7:00 - MST 1931 May 1 23:00
2427 -6:00 - CST 1931 Oct
2428 -7:00 - MST 1932 Apr 1
2429 -6:00 - CST 1942 Apr 24
2430 -7:00 - MST 1949 Jan 14
2431 -8:00 - PST 1970
2432 -7:00 Mexico M%sT 1999
2433 -7:00 - MST
2434
2435# From Alexander Krivenyshev (2010-04-21):
2436# According to news, Bahía de Banderas (Mexican state of Nayarit)
2437# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2438# share the same time zone as nearby city Puerto Vallarta, Jalisco).
2439#
2440# (Spanish)
2441# Bahía de Banderas homologa su horario al del centro del
2442# país, a partir de este domingo
2443# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2444# http://www.nayarit.gob.mx/notes.asp?id=20748
2445# </a>
2446#
2447# Bahía de Banderas homologa su horario con el del Centro del
2448# País
2449# <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">
2450# 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"
2451# </a>
2452#
2453# (English)
2454# Puerto Vallarta and Bahía de Banderas: One Time Zone
2455# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2456# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2457# </a>
2458#
2459# or
2460# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2461# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2462# </a>
2463#
2464# "Mexico's Senate approved the amendments to the Mexican Schedule System that
2465# will allow Bahía de Banderas and Puerto Vallarta to share the same time
2466# zone ..."
2467# Baja California Sur, Nayarit, Sinaloa
2468
2469# From Arthur David Olson (2010-05-01):
2470# Use "Bahia_Banderas" to keep the name to fourteen characters.
2471
2472Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2473 -7:00 - MST 1927 Jun 10 23:00
2474 -6:00 - CST 1930 Nov 15
2475 -7:00 - MST 1931 May 1 23:00
2476 -6:00 - CST 1931 Oct
2477 -7:00 - MST 1932 Apr 1
2478 -6:00 - CST 1942 Apr 24
2479 -7:00 - MST 1949 Jan 14
2480 -8:00 - PST 1970
2481 -7:00 Mexico M%sT
2482
2483Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2484 -7:00 - MST 1927 Jun 10 23:00
2485 -6:00 - CST 1930 Nov 15
2486 -7:00 - MST 1931 May 1 23:00
2487 -6:00 - CST 1931 Oct
2488 -7:00 - MST 1932 Apr 1
2489 -6:00 - CST 1942 Apr 24
2490 -7:00 - MST 1949 Jan 14
2491 -8:00 - PST 1970
2492 -7:00 Mexico M%sT 2010 Apr 4 2:00
2493 -6:00 Mexico C%sT
2494
2495# Baja California (near US border)
2496Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2497 -7:00 - MST 1924
2498 -8:00 - PST 1927 Jun 10 23:00
2499 -7:00 - MST 1930 Nov 15
2500 -8:00 - PST 1931 Apr 1
2501 -8:00 1:00 PDT 1931 Sep 30
2502 -8:00 - PST 1942 Apr 24
2503 -8:00 1:00 PWT 1945 Aug 14 23:00u
2504 -8:00 1:00 PPT 1945 Nov 12 # Peace
2505 -8:00 - PST 1948 Apr 5
2506 -8:00 1:00 PDT 1949 Jan 14
2507 -8:00 - PST 1954
2508 -8:00 CA P%sT 1961
2509 -8:00 - PST 1976
2510 -8:00 US P%sT 1996
2511 -8:00 Mexico P%sT 2001
2512 -8:00 US P%sT 2002 Feb 20
2513 -8:00 Mexico P%sT 2010
2514 -8:00 US P%sT
2515# Baja California (away from US border)
2516Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2517 -7:00 - MST 1924
2518 -8:00 - PST 1927 Jun 10 23:00
2519 -7:00 - MST 1930 Nov 15
2520 -8:00 - PST 1931 Apr 1
2521 -8:00 1:00 PDT 1931 Sep 30
2522 -8:00 - PST 1942 Apr 24
2523 -8:00 1:00 PWT 1945 Aug 14 23:00u
2524 -8:00 1:00 PPT 1945 Nov 12 # Peace
2525 -8:00 - PST 1948 Apr 5
2526 -8:00 1:00 PDT 1949 Jan 14
2527 -8:00 - PST 1954
2528 -8:00 CA P%sT 1961
2529 -8:00 - PST 1976
2530 -8:00 US P%sT 1996
2531 -8:00 Mexico P%sT 2001
2532 -8:00 US P%sT 2002 Feb 20
2533 -8:00 Mexico P%sT
2534# From Paul Eggert (2006-03-22):
2535# Formerly there was an America/Ensenada zone, which differed from
2536# America/Tijuana only in that it did not observe DST from 1976
2537# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2538# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2539# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2540# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2541# DST-observance was a town-by-town matter back then. This concerns
2542# data after 1970 so most likely there should be at least one Zone
2543# other than America/Tijuana for Baja, but it's not clear yet what its
2544# name or contents should be.
2545#
2546# Revillagigedo Is
2547# no information
2548
2549###############################################################################
2550
2551# Anguilla
2552# See 'southamerica'.
2553
2554# Antigua and Barbuda
2555# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2556Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2557 -5:00 - EST 1951
2558 -4:00 - AST
2559
2560# Bahamas
2561#
2562# For 1899 Milne gives -5:09:29.5; round that.
2563#
2564# From Sue Williams (2006-12-07):
2565# The Bahamas announced about a month ago that they plan to change their DST
2566# rules to sync with the U.S. starting in 2007....
2567# http://www.jonesbahamas.com/?c=45&a=10412
2568
2569# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2570Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2571Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2572# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2573Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2574 -5:00 Bahamas E%sT 1976
2575 -5:00 US E%sT
2576
2577# Barbados
2578
2579# For 1899 Milne gives -3:58:29.2; round that.
2580
2581# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2582Rule Barb 1977 only - Jun 12 2:00 1:00 D
2583Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2584Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2585Rule Barb 1979 only - Sep 30 2:00 0 S
2586Rule Barb 1980 only - Sep 25 2:00 0 S
2587# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2588Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2589 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2590 -4:00 Barb A%sT
2591
2592# Belize
2593# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2594# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2595Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2596Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2597Rule Belize 1973 only - Dec 5 0:00 1:00 D
2598Rule Belize 1974 only - Feb 9 0:00 0 S
2599Rule Belize 1982 only - Dec 18 0:00 1:00 D
2600Rule Belize 1983 only - Feb 12 0:00 0 S
2601# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2602Zone America/Belize -5:52:48 - LMT 1912 Apr
2603 -6:00 Belize C%sT
2604
2605# Bermuda
2606
2607# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2608# Bermuda dockyard, Ireland I; round that.
2609
2610# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2611
2612# Next year, however, clocks in the US will go forward on the second Sunday
2613# in March, until the first Sunday in November. And, after the Time Zone
2614# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2615# Friday, the same thing will happen in Bermuda.
2616# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2617
2618# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2619Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2620 -4:00 - AST 1974 Apr 28 2:00
2621 -4:00 Canada A%sT 1976
2622 -4:00 US A%sT
2623
2624# Cayman Is
2625# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2626Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2627 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2628 -5:00 - EST
2629
2630# Costa Rica
2631
2632# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2633
2634# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2635Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2636Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2637Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2638# IATA SSIM (1991-09) says the following was at 1:00;
2639# go with Shanks & Pottenger.
2640Rule CR 1991 only - Jul 1 0:00 0 S
2641Rule CR 1992 only - Mar 15 0:00 0 S
2642# There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2644Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2645 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2646 -6:00 CR C%sT
2647# Coco
2648# no information; probably like America/Costa_Rica
2649
2650# Cuba
2651
2652# From Paul Eggert (2013-02-21):
2653# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2654# for the port, and -5:30 for meteorological observations.
2655# For now, stick with Shanks & Pottenger.
2656
2657# From Arthur David Olson (1999-03-29):
2658# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2659# the Cuban National Team and the Baltimore Orioles was carried live on
2660# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2661# During the game, play-by-play announcer Jim Hunter noted that
2662# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2663# Time today." (The "two hour" remark referred to losing one hour of
2664# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2665# to DST--and one more hour on 1999-04-04--when the announcers will have
2666# returned to Baltimore, which switches on that date.)
2667
2668# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2669# Cuba is not going back to standard time this year.
2670# From Paul Eggert (2006-03-22):
2671# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2672# says that it's due to a problem at the Antonio Guiteras
2673# thermoelectric plant, and says "This October there will be no return
2674# to normal hours (after daylight saving time)".
2675# For now, let's assume that it's a temporary measure.
2676
2677# From Carlos A. Carnero Delgado (2005-11-12):
2678# This year (just like in 2004-2005) there's no change in time zone
2679# adjustment in Cuba. We will stay in daylight saving time:
2680# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2681
2682# From Jesper Norgaard Welen (2006-10-21):
2683# An article in GRANMA INTERNACIONAL claims that Cuba will end
2684# the 3 years of permanent DST next weekend, see
2685# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2686# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2687# watches should be set back one hour -- going back to 00:00 hours -- returning
2688# to the normal schedule....
2689
2690# From Paul Eggert (2007-03-02):
2691# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2692# says Cuban clocks will advance at midnight on March 10.
2693# For lack of better information, assume Cuba will use US rules,
2694# except that it switches at midnight standard time as usual.
2695#
2696# From Steffen Thorsen (2007-10-25):
2697# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2698# earlier - on the last Sunday of October, just like in 2006.
2699#
2700# He supplied these references:
2701#
2702# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2703# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2704#
2705# From Alex Kryvenishev (2007-10-25):
2706# Here is also article from Granma (Cuba):
2707#
2708# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2709# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2710#
2711# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2712
2713# From Arthur David Olson (2008-03-09):
2714# I'm in Maryland which is now observing United States Eastern Daylight
2715# Time. At 9:44 local time I used RealPlayer to listen to
2716# <a href="http://media.enet.cu/radioreloj">
2717# http://media.enet.cu/radioreloj
2718# </a>, a Cuban information station, and heard
2719# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2720# indicating that Cuba is still on standard time.
2721
2722# From Steffen Thorsen (2008-03-12):
2723# It seems that Cuba will start DST on Sunday, 2007-03-16...
2724# It was announced yesterday, according to this source (in Spanish):
2725# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2726# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2727# </a>
2728#
2729# Some more background information is posted here:
2730# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2731# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2732# </a>
2733#
2734# The article also says that Cuba has been observing DST since 1963,
2735# while Shanks (and tzdata) has 1965 as the first date (except in the
2736# 1940's). Many other web pages in Cuba also claim that it has been
2737# observed since 1963, but with the exception of 1970 - an exception
2738# which is not present in tzdata/Shanks. So there is a chance we need to
2739# change some historic records as well.
2740#
2741# One example:
2742# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2743# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2744# </a>
2745
2746# From Jesper Norgaard Welen (2008-03-13):
2747# The Cuban time change has just been confirmed on the most authoritative
2748# web site, the Granma. Please check out
2749# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2750# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2751# </a>
2752#
2753# Basically as expected after Steffen Thorsens information, the change
2754# will take place midnight between Saturday and Sunday.
2755
2756# From Arthur David Olson (2008-03-12):
2757# Assume Sun>=15 (third Sunday) going forward.
2758
2759# From Alexander Krivenyshev (2009-03-04)
2760# According to the Radio Reloj - Cuba will start Daylight Saving Time on
2761# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2762# not on midnight March 14 / March 15 as previously thought.
2763#
2764# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2765# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2766# (in Spanish)
2767# </a>
2768
2769# From Arthur David Olson (2009-03-09)
2770# I listened over the Internet to
2771# <a href="http://media.enet.cu/readioreloj">
2772# http://media.enet.cu/readioreloj
2773# </a>
2774# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2775# the time was announced as "diez cinco"--the same time as here, indicating
2776# that has indeed switched to DST. Assume second Sunday from 2009 forward.
2777
2778# From Steffen Thorsen (2011-03-08):
2779# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2780# this year. Nothing about the end date known so far (if that has
2781# changed at all).
2782#
2783# Source:
2784# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2785# http://granma.co.cu/2011/03/08/nacional/artic01.html
2786# </a>
2787#
2788# Our info:
2789# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2790# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2791# </a>
2792#
2793# From Steffen Thorsen (2011-10-30)
2794# Cuba will end DST two weeks later this year. Instead of going back
2795# tonight, it has been delayed to 2011-11-13 at 01:00.
2796#
2797# One source (Spanish)
2798# <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2799# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2800# </a>
2801#
2802# Our page:
2803# <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2804# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2805# </a>
2806#
2807# From Steffen Thorsen (2012-03-01)
2808# According to Radio Reloj, Cuba will start DST on Midnight between March
2809# 31 and April 1.
2810#
2811# Radio Reloj has the following info (Spanish):
2812# <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">
2813# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2814# </a>
2815#
2816# Our info on it:
2817# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2818# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2819# </a>
2820
2821# From Steffen Thorsen (2012-11-03):
2822# Radio Reloj and many other sources report that Cuba is changing back
2823# to standard time on 2012-11-04:
2824# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2825# From Paul Eggert (2012-11-03):
2826# For now, assume the future rule is first Sunday in November.
2827
2828# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2829Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2830Rule Cuba 1928 only - Oct 10 0:00 0 S
2831Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2832Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2833Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2834Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2835Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2836Rule Cuba 1965 only - Sep 30 0:00 0 S
2837Rule Cuba 1966 only - May 29 0:00 1:00 D
2838Rule Cuba 1966 only - Oct 2 0:00 0 S
2839Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2840Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2841Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2842Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2843Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2844Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2845Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2846Rule Cuba 1978 only - May 7 0:00 1:00 D
2847Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2848Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2849Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2850Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2851Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2852Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2853Rule Cuba 1996 only - Oct 6 0:00s 0 S
2854Rule Cuba 1997 only - Oct 12 0:00s 0 S
2855Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2856Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2857Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2858Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2859Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2860Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2861Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2862Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2863Rule Cuba 2011 only - Nov 13 0:00s 0 S
2864Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2865Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2866Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2867
2868# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2869Zone America/Havana -5:29:28 - LMT 1890
2870 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2871 -5:00 Cuba C%sT
2872
2873# Dominica
2874# See 'southamerica'.
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# Guadeloupe
2924# St Barthelemy
2925# St Martin (French part)
2926# See 'southamerica'.
2927
2928# Guatemala
2929#
2930# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2931# Diario Co Latino, at
2932# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2933# says in an article dated 2006-04-19 that the Guatemalan government had
2934# decided on that date to advance official time by 60 minutes, to lessen the
2935# impact of the elevated cost of oil.... Daylight saving time will last from
2936# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2937# From Paul Eggert (2006-06-22):
2938# The Ministry of Energy and Mines, press release CP-15/2006
2939# (2006-04-19), says DST ends at 24:00. See
2940# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2941
2942# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2943Rule Guat 1973 only - Nov 25 0:00 1:00 D
2944Rule Guat 1974 only - Feb 24 0:00 0 S
2945Rule Guat 1983 only - May 21 0:00 1:00 D
2946Rule Guat 1983 only - Sep 22 0:00 0 S
2947Rule Guat 1991 only - Mar 23 0:00 1:00 D
2948Rule Guat 1991 only - Sep 7 0:00 0 S
2949Rule Guat 2006 only - Apr 30 0:00 1:00 D
2950Rule Guat 2006 only - Oct 1 0:00 0 S
2951# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2952Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2953 -6:00 Guat C%sT
2954
2955# Haiti
2956# From Gwillim Law (2005-04-15):
2957# Risto O. Nykanen wrote me that Haiti is now on DST.
2958# I searched for confirmation, and I found a
2959# <a href="http://www.haitianconsulate.org/time.doc"> press release
2960# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2961# </a>. Translated from French, it says:
2962#
2963# "The Prime Minister's Communication Office notifies the public in general
2964# and the press in particular that, following a decision of the Interior
2965# Ministry and the Territorial Collectivities [I suppose that means the
2966# provinces], Haiti will move to Eastern Daylight Time in the night from next
2967# Saturday the 2nd to Sunday the 3rd.
2968#
2969# "Consequently, the Prime Minister's Communication Office wishes to inform
2970# the population that the country's clocks will be set forward one hour
2971# starting at midnight. This provision will hold until the last Saturday in
2972# October 2005.
2973#
2974# "Port-au-Prince, March 31, 2005"
2975#
2976# From Steffen Thorsen (2006-04-04):
2977# I have been informed by users that Haiti observes DST this year like
2978# last year, so the current "only" rule for 2005 might be changed to a
2979# "max" rule or to last until 2006. (Who knows if they will observe DST
2980# next year or if they will extend their DST like US/Canada next year).
2981#
2982# I have found this article about it (in French):
2983# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2984#
2985# The reason seems to be an energy crisis.
2986
2987# From Stephen Colebourne (2007-02-22):
2988# Some IATA info: Haiti won't be having DST in 2007.
2989
2990# From Steffen Thorsen (2012-03-11):
2991# According to several news sources, Haiti will observe DST this year,
2992# apparently using the same start and end date as USA/Canada.
2993# So this means they have already changed their time.
2994#
2995# http://www.alterpresse.org/spip.php?article12510
2996# http://radiovision2000haiti.net/home/?p=13253
2997#
2998# From Arthur David Olson (2012-03-11):
2999# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3000# 3:00 a.m. rather than the traditional Haitian jump at midnight.
3001# Assume a US-style fall back as well.
3002
3003# From Steffen Thorsen (2013-03-10):
3004# It appears that Haiti is observing DST this year as well, same rules
3005# as US/Canada. They did it last year as well, and it looks like they
3006# are going to observe DST every year now...
3007#
3008# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3009# http://www.canalplushaiti.net/?p=6714
3010
3011# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3012Rule Haiti 1983 only - May 8 0:00 1:00 D
3013Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3014Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3015# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3016# Go with IATA.
3017Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3018Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3019Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3020Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3021Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3022Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3023# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3024Zone America/Port-au-Prince -4:49:20 - LMT 1890
3025 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3026 -5:00 Haiti E%sT
3027
3028# Honduras
3029# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3030
3031# From Paul Eggert (2006-05-05):
3032# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3033# saying Honduras will start using DST midnight Saturday, effective 4
3034# months until September. La Tribuna reported today
3035# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3036# of Honduras, refused to back down on this.
3037
3038# From Jesper Norgaard Welen (2006-08-08):
3039# It seems that Honduras has returned from DST to standard time this Monday at
3040# 00:00 hours (prolonging Sunday to 25 hours duration).
3041# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3042
3043# From Paul Eggert (2006-08-08):
3044# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3045# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3046# It mentions executive decree 18-2006.
3047
3048# From Steffen Thorsen (2006-08-17):
3049# Honduras will observe DST from 2007 to 2009, exact dates are not
3050# published, I have located this authoritative source:
3051# http://www.presidencia.gob.hn/noticia.aspx?nId=47
3052
3053# From Steffen Thorsen (2007-03-30):
3054# http://www.laprensahn.com/pais_nota.php?id04962=7386
3055# So it seems that Honduras will not enter DST this year....
3056
3057# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3058Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3059Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3060Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3061Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3063Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3064 -6:00 Hond C%sT
3065#
3066# Great Swan I ceded by US to Honduras in 1972
3067
3068# Jamaica
3069# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3070# unspecified official document, and says "This time is used throughout the
3071# island". Go with Milne. Round to the nearest second as required by zic.
3072# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3073Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3074 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3075 -5:00 - EST 1974 Apr 28 2:00
3076 -5:00 US E%sT 1984
3077 -5:00 - EST
3078
3079# Martinique
3080# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3081Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3082 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3083 -4:00 - AST 1980 Apr 6
3084 -4:00 1:00 ADT 1980 Sep 28
3085 -4:00 - AST
3086
3087# Montserrat
3088# See 'southamerica'.
3089
3090# Nicaragua
3091#
3092# This uses Shanks & Pottenger for times before 2005.
3093#
3094# From Steffen Thorsen (2005-04-12):
3095# I've got reports from 8 different people that Nicaragua just started
3096# DST on Sunday 2005-04-10, in order to save energy because of
3097# expensive petroleum. The exact end date for DST is not yet
3098# announced, only "September" but some sites also say "mid-September".
3099# Some background information is available on the President's official site:
3100# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3101# The Decree, no 23-2005 is available here:
3102# 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
3103#
3104# From Paul Eggert (2005-05-01):
3105# The decree doesn't say anything about daylight saving, but for now let's
3106# assume that it is daylight saving....
3107#
3108# From Gwillim Law (2005-04-21):
3109# The Associated Press story on the time change, which can be found at
3110# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3111# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3112# time that a change of clocks was applied to save energy was in the year 2000
3113# during the Arnoldo Aleman administration."...
3114# The northamerica file says that Nicaragua has been on UTC-6 continuously
3115# since December 1998. I wasn't able to find any details of Nicaraguan time
3116# changes in 2000. Perhaps a note could be added to the northamerica file, to
3117# the effect that we have indirect evidence that DST was observed in 2000.
3118#
3119# From Jesper Norgaard Welen (2005-11-02):
3120# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3121# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3122# (2005-09-26)
3123#
3124# From Jesper Norgaard Welen (2006-05-05):
3125# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3126# (my informal translation)
3127# By order of the president of the republic, Enrique Bolanos, Nicaragua
3128# advanced by sixty minutes their official time, yesterday at 2 in the
3129# morning, and will stay that way until 30.th. of september.
3130#
3131# From Jesper Norgaard Welen (2006-09-30):
3132# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3133# My informal translation runs:
3134# The natural sun time is restored in all the national territory, in that the
3135# time is returned one hour at 01:00 am of October 1 of 2006.
3136#
3137# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3138Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3139Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3140Rule Nic 2005 only - Apr 10 0:00 1:00 D
3141Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3142Rule Nic 2006 only - Apr 30 2:00 1:00 D
3143Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3144# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3145Zone America/Managua -5:45:08 - LMT 1890
3146 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3147 -6:00 - CST 1973 May
3148 -5:00 - EST 1975 Feb 16
3149 -6:00 Nic C%sT 1992 Jan 1 4:00
3150 -5:00 - EST 1992 Sep 24
3151 -6:00 - CST 1993
3152 -5:00 - EST 1997
3153 -6:00 Nic C%sT
3154
3155# Panama
3156# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3157Zone America/Panama -5:18:08 - LMT 1890
3158 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3159 -5:00 - EST
3160
3161# Puerto Rico
3162# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3163# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3164Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3165 -4:00 - AST 1942 May 3
3166 -4:00 US A%sT 1946
3167 -4:00 - AST
3168
3169# St Kitts-Nevis
3170# St Lucia
3171# See 'southamerica'.
3172
3173# St Pierre and Miquelon
3174# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3175# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3176Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3177 -4:00 - AST 1980 May
3178 -3:00 - PMST 1987 # Pierre & Miquelon Time
3179 -3:00 Canada PM%sT
3180
3181# St Vincent and the Grenadines
3182# See 'southamerica'.
3183
3184# Turks and Caicos
3185#
3186# From Chris Dunn in
3187# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3188# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3189# daylight saving dates for time changes have been adjusted to match
3190# the recent U.S. change of dates.
3191#
3192# From Brian Inglis (2007-04-28):
3193# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3194# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3195# rows before that there is an out of date entry for Oct:
3196# "Eastern Standard Times Begins 2007
3197# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3198# indicating that the normal ET rules are followed.
3199#
3200# From Paul Eggert (2006-05-01):
3201# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3202# says they switch at midnight. Go with Shanks & Pottenger.
3203#
3204# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3205Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3206Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3207Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3208Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3209Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3211Zone America/Grand_Turk -4:44:32 - LMT 1890
3212 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3213 -5:00 TC E%sT
3214
3215# British Virgin Is
3216# Virgin Is
3217# See 'southamerica'.
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
603Link Pacific/Honolulu Pacific/Johnston
604
605# Now we turn to US areas that have diverged from the consensus since 1970.
606
607# Arizona mostly uses MST.
608
609# From Paul Eggert (2002-10-20):
610#
611# The information in the rest of this paragraph is derived from the
612# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
613# Daylight Saving Time web page (2002-01-23)</a> maintained by the
614# Arizona State Library, Archives and Public Records.
615# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
616# time, but by federal law railroads, airlines, bus lines, military
617# personnel, and some engaged in interstate commerce continued to
618# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
619# Gazette says that was the date the law changed, and that 04-01 was
620# the date the state's clocks would change. In 1945 the State of
621# Arizona used standard time all year, again with exceptions only as
622# mandated by federal law. Arizona observed DST in 1967, but Arizona
623# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
624#
625# Shanks says the 1944 experiment came to an end on 1944-03-17.
626# Go with the Arizona State Library instead.
627
628Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
629 -7:00 US M%sT 1944 Jan 1 00:01
630 -7:00 - MST 1944 Apr 1 00:01
631 -7:00 US M%sT 1944 Oct 1 00:01
632 -7:00 - MST 1967
633 -7:00 US M%sT 1968 Mar 21
634 -7:00 - MST
635# From Arthur David Olson (1988-02-13):
636# A writer from the Inter Tribal Council of Arizona, Inc.,
637# notes in private correspondence dated 1987-12-28 that "Presently, only the
638# Navajo Nation participates in the Daylight Saving Time policy, due to its
639# large size and location in three states." (The "only" means that other
640# tribal nations don't use DST.)
641#
642# From Paul Eggert (2013-08-26):
643# See America/Denver for a zone appropriate for the Navajo Nation.
644
645# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
646# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
647# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
648# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
649# Teton, Twin Falls, Valley, Washington counties, and the southern
650# quarter of Idaho county) and eastern Oregon (most of Malheur County)
651# switched four weeks late in 1974.
652#
653# Zone NAME GMTOFF RULES FORMAT [UNTIL]
654Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
655 -8:00 US P%sT 1923 May 13 2:00
656 -7:00 US M%sT 1974
657 -7:00 - MST 1974 Feb 3 2:00
658 -7:00 US M%sT
659
660# Indiana
661#
662# For a map of Indiana's time zone regions, see:
663# <a href="http://www.mccsc.edu/time.html">
664# What time is it in Indiana?
665# </a> (2006-03-01)
666#
667# From Paul Eggert (2007-08-17):
668# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
669# with the following exceptions:
670#
671# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
672# Vandenburgh, and Warrick counties have been like America/Chicago.
673#
674# - Dearborn and Ohio counties have been like America/New_York.
675#
676# - Clark, Floyd, and Harrison counties have been like
677# America/Kentucky/Louisville.
678#
679# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
680# and Switzerland counties have their own time zone histories as noted below.
681#
682# Shanks partitioned Indiana into 345 regions, each with its own time history,
683# and wrote "Even newspaper reports present contradictory information."
684# Those Hoosiers! Such a flighty and changeable people!
685# Fortunately, most of the complexity occurred before our cutoff date of 1970.
686#
687# Other than Indianapolis, the Indiana place names are so nondescript
688# that they would be ambiguous if we left them at the 'America' level.
689# So we reluctantly put them all in a subdirectory 'America/Indiana'.
690
691# From Paul Eggert (2005-08-16):
692# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
693
694# From Nathan Stratton Treadway (2006-03-30):
695# http://www.dot.gov/affairs/dot0406.htm [3705 B]
696# From Deborah Goldsmith (2006-01-18):
697# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
698# From Paul Eggert (2006-01-20):
699# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
700# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
701# Eastern Time Zone to the Central Time Zone.... The effective date of
702# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
703# changeover date from standard time to Daylight Saving Time."
704# Strictly speaking, this means the affected counties will change their
705# clocks twice that night, but this obviously is in error. The intent
706# is that 01:59:59 EST be followed by 02:00:00 CDT.
707
708# From Gwillim Law (2007-02-10):
709# The Associated Press has been reporting that Pulaski County, Indiana is
710# going to switch from Central to Eastern Time on March 11, 2007....
711# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
712
713# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
714Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
715Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
716Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
717# Zone NAME GMTOFF RULES FORMAT [UNTIL]
718Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
719 -6:00 US C%sT 1920
720 -6:00 Indianapolis C%sT 1942
721 -6:00 US C%sT 1946
722 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
723 -5:00 - EST 1957 Sep 29 2:00
724 -6:00 - CST 1958 Apr 27 2:00
725 -5:00 - EST 1969
726 -5:00 US E%sT 1971
727 -5:00 - EST 2006
728 -5:00 US E%sT
729#
730# Eastern Crawford County, Indiana, left its clocks alone in 1974,
731# as well as from 1976 through 2005.
732# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
733Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
734Rule Marengo 1951 only - Sep lastSun 2:00 0 S
735Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
736Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
737# Zone NAME GMTOFF RULES FORMAT [UNTIL]
738Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
739 -6:00 US C%sT 1951
740 -6:00 Marengo C%sT 1961 Apr 30 2:00
741 -5:00 - EST 1969
742 -5:00 US E%sT 1974 Jan 6 2:00
743 -6:00 1:00 CDT 1974 Oct 27 2:00
744 -5:00 US E%sT 1976
745 -5:00 - EST 2006
746 -5:00 US E%sT
747#
748# Daviess, Dubois, Knox, and Martin Counties, Indiana,
749# switched from eastern to central time in April 2006, then switched back
750# in November 2007.
751# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
752Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
753Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
754Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
755Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
756Rule Vincennes 1955 only - May 1 0:00 1:00 D
757Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
758Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
759Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
760Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
762Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
763 -6:00 US C%sT 1946
764 -6:00 Vincennes C%sT 1964 Apr 26 2:00
765 -5:00 - EST 1969
766 -5:00 US E%sT 1971
767 -5:00 - EST 2006 Apr 2 2:00
768 -6:00 US C%sT 2007 Nov 4 2:00
769 -5:00 US E%sT
770#
771# Perry County, Indiana, switched from eastern to central time in April 2006.
772# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
773Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
774Rule Perry 1946 only - Sep lastSun 2:00 0 S
775Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
776Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
777Rule Perry 1955 only - May 1 0:00 1:00 D
778Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
779Rule Perry 1960 only - Oct lastSun 2:00 0 S
780Rule Perry 1961 only - Sep lastSun 2:00 0 S
781Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
782# Zone NAME GMTOFF RULES FORMAT [UNTIL]
783Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
784 -6:00 US C%sT 1946
785 -6:00 Perry C%sT 1964 Apr 26 2:00
786 -5:00 - EST 1969
787 -5:00 US E%sT 1971
788 -5:00 - EST 2006 Apr 2 2:00
789 -6:00 US C%sT
790#
791# Pike County, Indiana moved from central to eastern time in 1977,
792# then switched back in 2006, then switched back again in 2007.
793# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
794Rule Pike 1955 only - May 1 0:00 1:00 D
795Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
796Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
797Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
800 -6:00 US C%sT 1955
801 -6:00 Pike C%sT 1965 Apr 25 2:00
802 -5:00 - EST 1966 Oct 30 2:00
803 -6:00 US C%sT 1977 Oct 30 2:00
804 -5:00 - EST 2006 Apr 2 2:00
805 -6:00 US C%sT 2007 Nov 4 2:00
806 -5:00 US E%sT
807#
808# Starke County, Indiana moved from central to eastern time in 1991,
809# then switched back in 2006.
810# From Arthur David Olson (1991-10-28):
811# An article on page A3 of the Sunday, 1991-10-27 Washington Post
812# notes that Starke County switched from Central time to Eastern time as of
813# 1991-10-27.
814# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
815Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
816Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
817Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
818Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
819Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
820# Zone NAME GMTOFF RULES FORMAT [UNTIL]
821Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
822 -6:00 US C%sT 1947
823 -6:00 Starke C%sT 1962 Apr 29 2:00
824 -5:00 - EST 1963 Oct 27 2:00
825 -6:00 US C%sT 1991 Oct 27 2:00
826 -5:00 - EST 2006 Apr 2 2:00
827 -6:00 US C%sT
828#
829# Pulaski County, Indiana, switched from eastern to central time in
830# April 2006 and then switched back in March 2007.
831# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
832Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
833Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
834Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
835Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
836# Zone NAME GMTOFF RULES FORMAT [UNTIL]
837Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
838 -6:00 US C%sT 1946
839 -6:00 Pulaski C%sT 1961 Apr 30 2:00
840 -5:00 - EST 1969
841 -5:00 US E%sT 1971
842 -5:00 - EST 2006 Apr 2 2:00
843 -6:00 US C%sT 2007 Mar 11 2:00
844 -5:00 US E%sT
845#
846# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
847# Zone NAME GMTOFF RULES FORMAT [UNTIL]
848Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
849 -6:00 US C%sT 1954 Apr 25 2:00
850 -5:00 - EST 1969
851 -5:00 US E%sT 1973
852 -5:00 - EST 2006
853 -5:00 US E%sT
854
855# Part of Kentucky left its clocks alone in 1974.
856# This also includes Clark, Floyd, and Harrison counties in Indiana.
857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
858Rule Louisville 1921 only - May 1 2:00 1:00 D
859Rule Louisville 1921 only - Sep 1 2:00 0 S
860Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
861Rule Louisville 1941 only - Sep lastSun 2:00 0 S
862Rule Louisville 1946 only - Jun 2 2:00 0 S
863Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
864Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
865# Zone NAME GMTOFF RULES FORMAT [UNTIL]
866Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
867 -6:00 US C%sT 1921
868 -6:00 Louisville C%sT 1942
869 -6:00 US C%sT 1946
870 -6:00 Louisville C%sT 1961 Jul 23 2:00
871 -5:00 - EST 1968
872 -5:00 US E%sT 1974 Jan 6 2:00
873 -6:00 1:00 CDT 1974 Oct 27 2:00
874 -5:00 US E%sT
875#
876# Wayne County, Kentucky
877#
878# From
879# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
880# Lake Cumberland LIFE
881# </a> (1999-01-29) via WKYM-101.7:
882# Clinton County has joined Wayne County in asking the DoT to change from
883# the Central to the Eastern time zone.... The Wayne County government made
884# the same request in December. And while Russell County officials have not
885# taken action, the majority of respondents to a poll conducted there in
886# August indicated they would like to change to "fast time" also.
887# The three Lake Cumberland counties are the farthest east of any U.S.
888# location in the Central time zone.
889#
890# From Rich Wales (2000-08-29):
891# After prolonged debate, and despite continuing deep differences of opinion,
892# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
893# (-0500) time. They won't "fall back" this year. See Sara Shipley,
894# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
895#
896# From Paul Eggert (2001-07-16):
897# The final rule was published in the
898# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
899# Federal Register 65, 160 (2000-08-17), page 50154-50158.
900# </a>
901#
902Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
903 -6:00 US C%sT 1946
904 -6:00 - CST 1968
905 -6:00 US C%sT 2000 Oct 29 2:00
906 -5:00 US E%sT
907
908
909# From Rives McDow (2000-08-30):
910# Here ... are all the changes in the US since 1985.
911# Kearny County, KS (put all of county on central;
912# previously split between MST and CST) ... 1990-10
913# Starke County, IN (from CST to EST) ... 1991-10
914# Oliver County, ND (from MST to CST) ... 1992-10
915# West Wendover, NV (from PST TO MST) ... 1999-10
916# Wayne County, KY (from CST to EST) ... 2000-10
917#
918# From Paul Eggert (2001-07-17):
919# We don't know where the line used to be within Kearny County, KS,
920# so omit that change for now.
921# See America/Indiana/Knox for the Starke County, IN change.
922# See America/North_Dakota/Center for the Oliver County, ND change.
923# West Wendover, NV officially switched from Pacific to mountain time on
924# 1999-10-31. See the
925# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
926# Federal Register 64, 203 (1999-10-21), page 56705-56707.
927# </a>
928# However, the Federal Register says that West Wendover already operated
929# on mountain time, and the rule merely made this official;
930# hence a separate tz entry is not needed.
931
932# Michigan
933#
934# From Bob Devine (1988-01-28):
935# Michigan didn't observe DST from 1968 to 1973.
936#
937# From Paul Eggert (1999-03-31):
938# Shanks writes that Michigan started using standard time on 1885-09-18,
939# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
940# that Detroit kept
941#
942# local time until 1900 when the City Council decreed that clocks should
943# be put back twenty-eight minutes to Central Standard Time. Half the
944# city obeyed, half refused. After considerable debate, the decision
945# was rescinded and the city reverted to Sun time. A derisive offer to
946# erect a sundial in front of the city hall was referred to the
947# Committee on Sewers. Then, in 1905, Central time was adopted
948# by city vote.
949#
950# This story is too entertaining to be false, so go with Howse over Shanks.
951#
952# From Paul Eggert (2001-03-06):
953# Garland (1927) writes "Cleveland and Detroit advanced their clocks
954# one hour in 1914." This change is not in Shanks. We have no more
955# info, so omit this for now.
956#
957# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
959Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
960Rule Detroit 1948 only - Sep lastSun 2:00 0 S
961Rule Detroit 1967 only - Jun 14 2:00 1:00 D
962Rule Detroit 1967 only - Oct lastSun 2:00 0 S
963# Zone NAME GMTOFF RULES FORMAT [UNTIL]
964Zone America/Detroit -5:32:11 - LMT 1905
965 -6:00 - CST 1915 May 15 2:00
966 -5:00 - EST 1942
967 -5:00 US E%sT 1946
968 -5:00 Detroit E%sT 1973
969 -5:00 US E%sT 1975
970 -5:00 - EST 1975 Apr 27 2:00
971 -5:00 US E%sT
972#
973# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
974# switched from EST to CST/CDT in 1973.
975# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
976Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
977Rule Menominee 1946 only - Sep lastSun 2:00 0 S
978Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
979Rule Menominee 1966 only - Oct lastSun 2:00 0 S
980# Zone NAME GMTOFF RULES FORMAT [UNTIL]
981Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
982 -6:00 US C%sT 1946
983 -6:00 Menominee C%sT 1969 Apr 27 2:00
984 -5:00 - EST 1973 Apr 29 2:00
985 -6:00 US C%sT
986
987# Navassa
988# administered by the US Fish and Wildlife Service
989# claimed by US under the provisions of the 1856 Guano Islands Act
990# also claimed by Haiti
991# occupied 1857/1900 by the Navassa Phosphate Co
992# US lighthouse 1917/1996-09
993# currently uninhabited
994# see Mark Fineman, "An Isle Rich in Guano and Discord",
995# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
996# Jimmy Skaggs, _The Great Guano Rush_ (1994).
997
998################################################################################
999
1000
1001# From Paul Eggert (2006-03-22):
1002# A good source for time zone historical data outside the U.S. is
1003# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1004# San Diego: ACS Publications, Inc. (2003).
1005#
1006# Gwillim Law writes that a good source
1007# for recent time zone data is the International Air Transport
1008# Association's Standard Schedules Information Manual (IATA SSIM),
1009# published semiannually. Law sent in several helpful summaries
1010# of the IATA's data after 1990.
1011#
1012# Except where otherwise noted, Shanks & Pottenger is the source for
1013# entries through 1990, and IATA SSIM is the source for entries afterwards.
1014#
1015# Other sources occasionally used include:
1016#
1017# Edward W. Whitman, World Time Differences,
1018# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1019# which I found in the UCLA library.
1020#
1021# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1022# William Willett, The Waste of Daylight, 19th edition
1023# </a> (1914-03)
1024#
1025# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1026# <http://www.jstor.org/stable/1774359>.
1027#
1028# See the 'europe' file for Greenland.
1029
1030# Canada
1031
1032# From Alain LaBont<e'> (1994-11-14):
1033# I post here the time zone abbreviations standardized in Canada
1034# for both English and French in the CAN/CSA-Z234.4-89 standard....
1035#
1036# UTC Standard time Daylight savings time
1037# offset French English French English
1038# -2:30 - - HAT NDT
1039# -3 - - HAA ADT
1040# -3:30 HNT NST - -
1041# -4 HNA AST HAE EDT
1042# -5 HNE EST HAC CDT
1043# -6 HNC CST HAR MDT
1044# -7 HNR MST HAP PDT
1045# -8 HNP PST HAY YDT
1046# -9 HNY YST - -
1047#
1048# HN: Heure Normale ST: Standard Time
1049# HA: Heure Avanc<e'>e DT: Daylight saving Time
1050#
1051# A: de l'Atlantique Atlantic
1052# C: du Centre Central
1053# E: de l'Est Eastern
1054# M: Mountain
1055# N: Newfoundland
1056# P: du Pacifique Pacific
1057# R: des Rocheuses
1058# T: de Terre-Neuve
1059# Y: du Yukon Yukon
1060#
1061# From Paul Eggert (1994-11-22):
1062# Alas, this sort of thing must be handled by localization software.
1063
1064# Unless otherwise specified, the data for Canada are all from Shanks
1065# & Pottenger.
1066
1067# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1068# 2007-03-01):
1069# The British Columbia government announced yesterday that it will
1070# adjust daylight savings next year to align with changes in the
1071# U.S. and the rest of Canada....
1072# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1073# ...
1074# Nova Scotia
1075# Daylight saving time will be extended by four weeks starting in 2007....
1076# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1077#
1078# [For New Brunswick] the new legislation dictates that the time change is to
1079# be done at 02:00 instead of 00:01.
1080# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1081# ...
1082# Manitoba has traditionally changed the clock every fall at 03:00.
1083# As of 2006, the transition is to take place one hour earlier at 02:00.
1084# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1085# ...
1086# [Alberta, Ontario, Quebec] will follow US rules.
1087# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1088# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1089# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1090# ...
1091# P.E.I. will follow US rules....
1092# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1093# ...
1094# Province of Newfoundland and Labrador....
1095# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1096# ...
1097# Yukon
1098# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1099# ...
1100# N.W.T. will follow US rules. Whoever maintains the government web site
1101# does not seem to believe in bookmarks. To see the news release, click the
1102# following link and search for "Daylight Savings Time Change". Press the
1103# "Daylight Savings Time Change" link; it will fire off a popup using
1104# JavaScript.
1105# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1106# ...
1107# Nunavut
1108# An amendment to the Interpretation Act was registered on February 19/2007....
1109# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1110
1111# From Paul Eggert (2006-04-25):
1112# H. David Matthews and Mary Vincent's map
1113# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1114# "It's about TIME", _Canadian Geographic_ (September-October 1998)
1115# </a> contains detailed boundaries for regions observing nonstandard
1116# time and daylight saving time arrangements in Canada circa 1998.
1117#
1118# INMS, the Institute for National Measurement Standards in Ottawa, has <a
1119# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1120# information about standard and daylight saving time zones in Canada.
1121# </a> (updated periodically).
1122# Its unofficial information is often taken from Matthews and Vincent.
1123
1124# From Paul Eggert (2006-06-27):
1125# For now, assume all of DST-observing Canada will fall into line with the
1126# new US DST rules,
1127
1128# From Chris Walton (2011-12-01)
1129# In the first of Tammy Hardwick's articles
1130# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1131# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1132# </a>
1133# she quotes the Friday November 1/1918 edition of the Creston Review.
1134# The quote includes these two statements:
1135# 'Sunday the CPR went back to the old system of time...'
1136# '... The daylight saving scheme was dropped all over Canada at the same time,'
1137# These statements refer to a transition from daylight time to standard time
1138# that occurred nationally on Sunday October 27/1918. This transition was
1139# also documented in the Saturday October 26/1918 edition of the Toronto Star.
1140
1141# In light of that evidence, we alter the date from the earlier believed
1142# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1143# than Thursday) in all Canadian rulesets.
1144
1145# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1146Rule Canada 1918 only - Apr 14 2:00 1:00 D
1147Rule Canada 1918 only - Oct 27 2:00 0 S
1148Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1149Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1150Rule Canada 1945 only - Sep 30 2:00 0 S
1151Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1152Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1153Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1154Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1155Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1156
1157
1158# Newfoundland and Labrador
1159
1160# From Paul Eggert (2000-10-02):
1161# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1162# but the only part of Labrador that follows the rules is the
1163# southeast corner, including Port Hope Simpson and Mary's Harbour,
1164# but excluding, say, Black Tickle.
1165
1166# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1167Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1168Rule StJohns 1917 only - Sep 17 2:00 0 S
1169# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1170Rule StJohns 1919 only - May 5 23:00 1:00 D
1171Rule StJohns 1919 only - Aug 12 23:00 0 S
1172# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1173Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1174Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1175# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1176# Pottenger.
1177Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1178Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1179# Whitman gives the following transitions:
1180# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1181# but go with Shanks & Pottenger and assume they used Canadian rules.
1182# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1183# Apr 30 - Sep 24; go with Shanks & Pottenger.
1184Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1185Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1186Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1187Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1188Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1189# From Paul Eggert (2000-10-02):
1190# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1191# at 00:01 local time. For now, assume it started in 1987.
1192
1193# From Michael Pelley (2011-09-12):
1194# We received today, Monday, September 12, 2011, notification that the
1195# changes to the Newfoundland Standard Time Act have been proclaimed.
1196# The change in the Act stipulates that the change from Daylight Savings
1197# Time to Standard Time and from Standard Time to Daylight Savings Time
1198# now occurs at 2:00AM.
1199# ...
1200# <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1201# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1202# </a>
1203# ...
1204# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1205# Office of the Chief Information Officer
1206# Executive Council
1207# Government of Newfoundland & Labrador
1208
1209Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1210Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1211Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1212Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1213Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1214Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1215#
1216# St John's has an apostrophe, but Posix file names can't have apostrophes.
1217# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1218Zone America/St_Johns -3:30:52 - LMT 1884
1219 -3:30:52 StJohns N%sT 1918
1220 -3:30:52 Canada N%sT 1919
1221 -3:30:52 StJohns N%sT 1935 Mar 30
1222 -3:30 StJohns N%sT 1942 May 11
1223 -3:30 Canada N%sT 1946
1224 -3:30 StJohns N%sT 2011 Nov
1225 -3:30 Canada N%sT
1226
1227# most of east Labrador
1228
1229# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1230# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1231Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1232 -3:30:52 - NST 1918
1233 -3:30:52 Canada N%sT 1919
1234 -3:30:52 - NST 1935 Mar 30
1235 -3:30 - NST 1936
1236 -3:30 StJohns N%sT 1942 May 11
1237 -3:30 Canada N%sT 1946
1238 -3:30 StJohns N%sT 1966 Mar 15 2:00
1239 -4:00 StJohns A%sT 2011 Nov
1240 -4:00 Canada A%sT
1241
1242
1243# west Labrador, Nova Scotia, Prince Edward I
1244
1245# From Paul Eggert (2006-03-22):
1246# Shanks & Pottenger write that since 1970 most of this region has been like
1247# Halifax. Many locales did not observe peacetime DST until 1972;
1248# Glace Bay, NS is the largest that we know of.
1249# Shanks & Pottenger also write that Liverpool, NS was the only town
1250# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1251# this is a typo.
1252
1253# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1254Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1255Rule Halifax 1916 only - Oct 1 0:00 0 S
1256Rule Halifax 1920 only - May 9 0:00 1:00 D
1257Rule Halifax 1920 only - Aug 29 0:00 0 S
1258Rule Halifax 1921 only - May 6 0:00 1:00 D
1259Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1260Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1261Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1262Rule Halifax 1923 only - Sep 4 0:00 0 S
1263Rule Halifax 1924 only - Sep 15 0:00 0 S
1264Rule Halifax 1925 only - Sep 28 0:00 0 S
1265Rule Halifax 1926 only - May 16 0:00 1:00 D
1266Rule Halifax 1926 only - Sep 13 0:00 0 S
1267Rule Halifax 1927 only - May 1 0:00 1:00 D
1268Rule Halifax 1927 only - Sep 26 0:00 0 S
1269Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1270Rule Halifax 1928 only - Sep 9 0:00 0 S
1271Rule Halifax 1929 only - Sep 3 0:00 0 S
1272Rule Halifax 1930 only - Sep 15 0:00 0 S
1273Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1274Rule Halifax 1932 only - May 1 0:00 1:00 D
1275Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1276Rule Halifax 1933 only - Oct 2 0:00 0 S
1277Rule Halifax 1934 only - May 20 0:00 1:00 D
1278Rule Halifax 1934 only - Sep 16 0:00 0 S
1279Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1280Rule Halifax 1935 only - Sep 30 0:00 0 S
1281Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1282Rule Halifax 1936 only - Sep 14 0:00 0 S
1283Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1284Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1285Rule Halifax 1939 only - May 28 0:00 1:00 D
1286Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1287Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1288Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1289Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1290Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1291Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1292Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1293Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1294Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1295# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1296Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1297 -4:00 Halifax A%sT 1918
1298 -4:00 Canada A%sT 1919
1299 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1300 -4:00 Canada A%sT 1946
1301 -4:00 Halifax A%sT 1974
1302 -4:00 Canada A%sT
1303Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1304 -4:00 Canada A%sT 1953
1305 -4:00 Halifax A%sT 1954
1306 -4:00 - AST 1972
1307 -4:00 Halifax A%sT 1974
1308 -4:00 Canada A%sT
1309
1310# New Brunswick
1311
1312# From Paul Eggert (2007-01-31):
1313# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1314# says they changed at 00:01 through 2006, and
1315# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1316# clear that this was the case since at least 1993.
1317# For now, assume it started in 1993.
1318
1319# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1320Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1321Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1322Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1323Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1324Rule Moncton 1939 only - May 27 1:00 1:00 D
1325Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1326Rule Moncton 1940 only - May 19 1:00 1:00 D
1327Rule Moncton 1941 only - May 4 1:00 1:00 D
1328Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1329Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1330Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1331Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1332Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1333# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1334Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1335 -5:00 - EST 1902 Jun 15
1336 -4:00 Canada A%sT 1933
1337 -4:00 Moncton A%sT 1942
1338 -4:00 Canada A%sT 1946
1339 -4:00 Moncton A%sT 1973
1340 -4:00 Canada A%sT 1993
1341 -4:00 Moncton A%sT 2007
1342 -4:00 Canada A%sT
1343
1344# Quebec
1345
1346# From Paul Eggert (2013-08-30):
1347# Since 1970 most of Quebec has been like Toronto.
1348# However, because earlier versions of the tz database mistakenly relied on data
1349# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1350# a separate entry was created for most of Quebec. We're loath to lose
1351# its pre-1970 info, even though the tz database is normally limited to
1352# zones that differ after 1970, so keep this otherwise out-of-scope entry.
1353
1354# Matthews and Vincent (1998) also write that Quebec east of the -63
1355# meridian is supposed to observe AST, but residents as far east as
1356# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1357# The Quebec department of justice writes in
1358# "The situation in Minganie and Basse-Cote-Nord"
1359# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1360# that the coastal strip from just east of Natashquan to Blanc-Sablon
1361# observes Atlantic standard time all year round.
1362# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1363# says this common practice was codified into law as of 2007.
1364# For lack of better info, guess this practice began around 1970, contra to
1365# Shanks & Pottenger who have this region observing AST/ADT.
1366# for post-1970 data America/Puerto_Rico.
1367
1368# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1369Rule Mont 1917 only - Mar 25 2:00 1:00 D
1370Rule Mont 1917 only - Apr 24 0:00 0 S
1371Rule Mont 1919 only - Mar 31 2:30 1:00 D
1372Rule Mont 1919 only - Oct 25 2:30 0 S
1373Rule Mont 1920 only - May 2 2:30 1:00 D
1374Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1375Rule Mont 1921 only - May 1 2:00 1:00 D
1376Rule Mont 1922 only - Apr 30 2:00 1:00 D
1377Rule Mont 1924 only - May 17 2:00 1:00 D
1378Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1379Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1380# The 1927-to-1937 rules can be expressed more simply as
1381# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1382# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1383# The rules below avoid use of 24:00
1384# (which pre-1998 versions of zic cannot handle).
1385Rule Mont 1927 only - May 1 0:00 1:00 D
1386Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1387Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1388Rule Mont 1932 only - May 1 0:00 1:00 D
1389Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1390Rule Mont 1933 only - Oct 1 0:00 0 S
1391Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1392Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1393Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1394Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1395Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1396Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1397
1398# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1399Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1400 -4:00 Canada A%sT 1970
1401 -4:00 - AST
1402Zone America/Montreal -4:54:16 - LMT 1884
1403 -5:00 Mont E%sT 1918
1404 -5:00 Canada E%sT 1919
1405 -5:00 Mont E%sT 1942 Feb 9 2:00s
1406 -5:00 Canada E%sT 1946
1407 -5:00 Mont E%sT 1974
1408 -5:00 Canada E%sT
1409
1410# Ontario
1411
1412# From Paul Eggert (2006-07-09):
1413# Shanks & Pottenger write that since 1970 most of Ontario has been like
1414# Toronto.
1415# Thunder Bay skipped DST in 1973.
1416# Many smaller locales did not observe peacetime DST until 1974;
1417# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1418# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1419
1420# From Mark Brader (2003-07-26):
1421# [According to the Toronto Star] Orillia, Ontario, adopted DST
1422# effective Saturday, 1912-06-22, 22:00; the article mentions that
1423# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1424# have already done so. In Orillia DST was to run until Saturday,
1425# 1912-08-31 (no time mentioned), but it was met with considerable
1426# hostility from certain segments of the public, and was revoked after
1427# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1428# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1429# earlier in June).
1430#
1431# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1432
1433# From Paul Eggert (1997-10-17):
1434# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1435# says that Atikokan, Ontario currently does not observe DST,
1436# but will vote on 11-10 whether to use EST/EDT.
1437# He also writes that the
1438# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1439# Ontario Time Act (1990, Chapter T.9)
1440# </a>
1441# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1442# Officially Atikokan is therefore on CST/CDT, and most likely this report
1443# concerns a non-official time observed as a matter of local practice.
1444#
1445# From Paul Eggert (2000-10-02):
1446# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1447# New Osnaburgh observe CST all year, that Big Trout Lake observes
1448# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1449# violation of the official Ontario rules.
1450#
1451# From Paul Eggert (2006-07-09):
1452# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1453# 2005-07-21 Chronicle-Journal, which said:
1454#
1455# The clocks in Atikokan stay set on standard time year-round.
1456# This means they spend about half the time on central time and
1457# the other half on eastern time.
1458#
1459# For the most part, the system works, Mayor Dennis Brown said.
1460#
1461# "The majority of businesses in Atikokan deal more with Eastern
1462# Canada, but there are some that deal with Western Canada," he
1463# said. "I don't see any changes happening here."
1464#
1465# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1466# [New Osnaburgh] follow the same practice."
1467
1468# From Garry McKinnon (2006-07-14) via Chris Walton:
1469# I chatted with a member of my board who has an outstanding memory
1470# and a long history in Atikokan (and in the telecom industry) and he
1471# can say for certain that Atikokan has been practicing the current
1472# time keeping since 1952, at least.
1473
1474# From Paul Eggert (2006-07-17):
1475# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1476# ever since standard time was introduced, but the information from
1477# McKinnon sounds more authoritative. For now, assume that Atikokan
1478# switched to EST immediately after WWII era daylight saving time
1479# ended. This matches the old (less-populous) America/Coral_Harbour
1480# entry since our cutoff date of 1970, so we can move
1481# America/Coral_Harbour to the 'backward' file.
1482
1483# From Mark Brader (2010-03-06):
1484#
1485# Currently the database has:
1486#
1487# # Ontario
1488#
1489# # From Paul Eggert (2006-07-09):
1490# # Shanks & Pottenger write that since 1970 most of Ontario has been like
1491# # Toronto.
1492# # Thunder Bay skipped DST in 1973.
1493# # Many smaller locales did not observe peacetime DST until 1974;
1494# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1495#
1496# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1497# right corner of page 1, it says that Toronto will return to standard
1498# time at 2 am Sunday morning (which agrees with the database), and that:
1499#
1500# The one-hour setback will go into effect throughout most of Ontario,
1501# except in areas like Windsor which remains on standard time all year.
1502#
1503# Windsor is, of course, a lot larger than Nipigon.
1504#
1505# I only came across this incidentally. I don't know if Windsor began
1506# observing DST when Detroit did, or in 1974, or on some other date.
1507#
1508# By the way, the article continues by noting that:
1509#
1510# Some cities in the United States have pushed the deadline back
1511# three weeks and will change over from daylight saving in October.
1512
1513# From Arthur David Olson (2010-07-17):
1514#
1515# "Standard Time and Time Zones in Canada" appeared in
1516# The Journal of The Royal Astronomical Society of Canada,
1517# volume 26, number 2 (February 1932) and, as of 2010-07-17,
1518# was available at
1519# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1520# http://adsabs.harvard.edu/full/1932JRASC..26...49S
1521# </a>
1522#
1523# It includes the text below (starting on page 57):
1524#
1525# A list of the places in Canada using daylight saving time would
1526# require yearly revision. From information kindly furnished by
1527# the provincial governments and by the postmasters in many cities
1528# and towns, it is found that the following places used daylight sav-
1529# ing in 1930. The information for the province of Quebec is definite,
1530# for the other provinces only approximate:
1531#
1532# Province Daylight saving time used
1533# Prince Edward Island Not used.
1534# Nova Scotia In Halifax only.
1535# New Brunswick In St. John only.
1536# Quebec In the following places:
1537# Montreal Lachine
1538# Quebec Mont-Royal
1539# Levis Iberville
1540# St. Lambert Cap de la Madeleine
1541# Verdun Loretteville
1542# Westmount Richmond
1543# Outremont St. Jerome
1544# Longueuil Greenfield Park
1545# Arvida Waterloo
1546# Chambly-Canton Beaulieu
1547# Melbourne La Tuque
1548# St. Theophile Buckingham
1549# Ontario Used generally in the cities and towns along
1550# the southerly part of the province. Not
1551# used in the northwesterlhy part.
1552# Manitoba Not used.
1553# Saskatchewan In Regina only.
1554# Alberta Not used.
1555# British Columbia Not used.
1556#
1557# With some exceptions, the use of daylight saving may be said to be limited
1558# to those cities and towns lying between Quebec city and Windsor, Ont.
1559
1560# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1561Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1562Rule Toronto 1919 only - Oct 26 0:00 0 S
1563Rule Toronto 1920 only - May 2 2:00 1:00 D
1564Rule Toronto 1920 only - Sep 26 0:00 0 S
1565Rule Toronto 1921 only - May 15 2:00 1:00 D
1566Rule Toronto 1921 only - Sep 15 2:00 0 S
1567Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1568# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1569# was meant.
1570Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1571Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1572# The 1927-to-1939 rules can be expressed more simply as
1573# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1574# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1575# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1576# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1577# The rules below avoid use of Sun>=25
1578# (which pre-2004 versions of zic cannot handle).
1579Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1580Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1581Rule Toronto 1932 only - May 1 2:00 1:00 D
1582Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1583Rule Toronto 1933 only - Oct 1 2:00 0 S
1584Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1585Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1586Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1587Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1588Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1589Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1590Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1591Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1592Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1593# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1594# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1595# is wrong, and that he had confirmed it by checking the 1971-10-30
1596# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1597Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1598
1599# From Paul Eggert (2003-07-27):
1600# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1601# Port Arthur, Ontario, the principle of the Bill has been in
1602# operation for the past three years, and in the City of Moose Jaw,
1603# Saskatchewan, for one year."
1604
1605# From David Bryan via Tory Tronrud, Director/Curator,
1606# Thunder Bay Museum (2003-11-12):
1607# There is some suggestion, however, that, by-law or not, daylight
1608# savings time was being practiced in Fort William and Port Arthur
1609# before 1909.... [I]n 1910, the line between the Eastern and Central
1610# Time Zones was permanently moved about two hundred miles west to
1611# include the Thunder Bay area.... When Canada adopted daylight
1612# savings time in 1916, Fort William and Port Arthur, having done so
1613# already, did not change their clocks.... During the Second World
1614# War,... [t]he cities agreed to implement DST during the summer
1615# months for the remainder of the war years.
1616
1617# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1618Zone America/Toronto -5:17:32 - LMT 1895
1619 -5:00 Canada E%sT 1919
1620 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1621 -5:00 Canada E%sT 1946
1622 -5:00 Toronto E%sT 1974
1623 -5:00 Canada E%sT
1624Zone America/Thunder_Bay -5:57:00 - LMT 1895
1625 -6:00 - CST 1910
1626 -5:00 - EST 1942
1627 -5:00 Canada E%sT 1970
1628 -5:00 Toronto E%sT 1973
1629 -5:00 - EST 1974
1630 -5:00 Canada E%sT
1631Zone America/Nipigon -5:53:04 - LMT 1895
1632 -5:00 Canada E%sT 1940 Sep 29
1633 -5:00 1:00 EDT 1942 Feb 9 2:00s
1634 -5:00 Canada E%sT
1635Zone America/Rainy_River -6:18:16 - 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
1639Zone America/Atikokan -6:06:28 - LMT 1895
1640 -6:00 Canada C%sT 1940 Sep 29
1641 -6:00 1:00 CDT 1942 Feb 9 2:00s
1642 -6:00 Canada C%sT 1945 Sep 30 2:00
1643 -5:00 - EST
1644
1645
1646# Manitoba
1647
1648# From Rob Douglas (2006-04-06):
1649# the old Manitoba Time Act - as amended by Bill 2, assented to
1650# March 27, 1987 ... said ...
1651# "between two o'clock Central Standard Time in the morning of
1652# the first Sunday of April of each year and two o'clock Central
1653# Standard Time in the morning of the last Sunday of October next
1654# following, one hour in advance of Central Standard Time."...
1655# I believe that the English legislation [of the old time act] had =
1656# been assented to (March 22, 1967)....
1657# Also, as far as I can tell, there was no order-in-council varying
1658# the time of Daylight Saving Time for 2005 and so the provisions of
1659# the 1987 version would apply - the changeover was at 2:00 Central
1660# Standard Time (i.e. not until 3:00 Central Daylight Time).
1661
1662# From Paul Eggert (2006-04-10):
1663# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1664# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1665# it was also 02:00s in 1966.
1666
1667# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1668Rule Winn 1916 only - Apr 23 0:00 1:00 D
1669Rule Winn 1916 only - Sep 17 0:00 0 S
1670Rule Winn 1918 only - Apr 14 2:00 1:00 D
1671Rule Winn 1918 only - Oct 27 2:00 0 S
1672Rule Winn 1937 only - May 16 2:00 1:00 D
1673Rule Winn 1937 only - Sep 26 2:00 0 S
1674Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1675Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1676Rule Winn 1945 only - Sep lastSun 2:00 0 S
1677Rule Winn 1946 only - May 12 2:00 1:00 D
1678Rule Winn 1946 only - Oct 13 2:00 0 S
1679Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1680Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1681Rule Winn 1950 only - May 1 2:00 1:00 D
1682Rule Winn 1950 only - Sep 30 2:00 0 S
1683Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1684Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1685Rule Winn 1959 only - Oct lastSun 2:00 0 S
1686Rule Winn 1960 only - Sep lastSun 2:00 0 S
1687Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1688Rule Winn 1963 only - Sep 22 2:00 0 S
1689Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1690Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1691Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1692# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1693Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1694 -6:00 Winn C%sT 2006
1695 -6:00 Canada C%sT
1696
1697
1698# Saskatchewan
1699
1700# From Mark Brader (2003-07-26):
1701# The first actual adoption of DST in Canada was at the municipal
1702# level. As the [Toronto] Star put it (1912-06-07), "While people
1703# elsewhere have long been talking of legislation to save daylight,
1704# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1705# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1706# presumably late evening, as below), and would run until "the end of
1707# the summer". The discrepancy between municipal time and railroad
1708# time was noted.
1709
1710# From Paul Eggert (2003-07-27):
1711# Willett (1914-03) notes that DST "has been in operation ... in the
1712# City of Moose Jaw, Saskatchewan, for one year."
1713
1714# From Paul Eggert (2006-03-22):
1715# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1716# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1717# Other western towns (e.g. Lloydminster) are like Edmonton.
1718# Matthews and Vincent (1998) write that Denare Beach and Creighton
1719# are like Winnipeg, in violation of Saskatchewan law.
1720
1721# From W. Jones (1992-11-06):
1722# The. . .below is based on information I got from our law library, the
1723# provincial archives, and the provincial Community Services department.
1724# A precise history would require digging through newspaper archives, and
1725# since you didn't say what you wanted, I didn't bother.
1726#
1727# Saskatchewan is split by a time zone meridian (105W) and over the years
1728# the boundary became pretty ragged as communities near it reevaluated
1729# their affiliations in one direction or the other. In 1965 a provincial
1730# referendum favoured legislating common time practices.
1731#
1732# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1733# Saskatchewan 1978) was proclaimed, and established that the eastern
1734# part of Saskatchewan would use CST year round, that districts in
1735# northwest Saskatchewan would by default follow CST but could opt to
1736# follow Mountain Time rules (thus 1 hour difference in the winter and
1737# zero in the summer), and that districts in southwest Saskatchewan would
1738# by default follow MT but could opt to follow CST.
1739#
1740# It took a few years for the dust to settle (I know one story of a town
1741# on one time zone having its school in another, such that a mom had to
1742# serve her family lunch in two shifts), but presently it seems that only
1743# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1744# rules any more; all other districts appear to have used CST year round
1745# since sometime in the 1960s.
1746
1747# From Chris Walton (2006-06-26):
1748# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1749# long and rather painful to read.
1750# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1751
1752# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1753Rule Regina 1918 only - Apr 14 2:00 1:00 D
1754Rule Regina 1918 only - Oct 27 2:00 0 S
1755Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1756Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1757Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1758Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1759Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1760Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1761Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1762Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1763Rule Regina 1945 only - Sep lastSun 2:00 0 S
1764Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1765Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1766Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1767Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1768Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1769Rule Regina 1959 only - Oct lastSun 2:00 0 S
1770#
1771Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1772Rule Swift 1957 only - Oct lastSun 2:00 0 S
1773Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1774Rule Swift 1959 only - Oct lastSun 2:00 0 S
1775Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1776# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1777Zone America/Regina -6:58:36 - LMT 1905 Sep
1778 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1779 -6:00 - CST
1780Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1781 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1782 -7:00 Regina M%sT 1950
1783 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1784 -6:00 - CST
1785
1786
1787# Alberta
1788
1789# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1790Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1791Rule Edm 1918 only - Oct 27 2:00 0 S
1792Rule Edm 1919 only - May 27 2:00 0 S
1793Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1794Rule Edm 1920 only - Oct lastSun 2:00 0 S
1795Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1796Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1797Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1798Rule Edm 1945 only - Sep lastSun 2:00 0 S
1799Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1800Rule Edm 1947 only - Sep lastSun 2:00 0 S
1801Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1802Rule Edm 1967 only - Oct lastSun 2:00 0 S
1803Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1804Rule Edm 1969 only - Oct lastSun 2:00 0 S
1805Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1806Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1807# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1808Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1809 -7:00 Edm M%sT 1987
1810 -7:00 Canada M%sT
1811
1812
1813# British Columbia
1814
1815# From Paul Eggert (2006-03-22):
1816# Shanks & Pottenger write that since 1970 most of this region has
1817# been like Vancouver.
1818# Dawson Creek uses MST. Much of east BC is like Edmonton.
1819# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1820
1821# It seems though that (re: Creston) is not entirely correct:
1822
1823# From Chris Walton (2011-12-01):
1824# There are two areas within the Canadian province of British Columbia
1825# that do not currently observe daylight saving:
1826# a) The Creston Valley (includes the town of Creston and surrounding area)
1827# b) The eastern half of the Peace River Regional District
1828# (includes the cities of Dawson Creek and Fort St. John)
1829
1830# Earlier this year I stumbled across a detailed article about the time
1831# keeping history of Creston; it was written by Tammy Hardwick who is the
1832# manager of the Creston & District Museum. The article was written in May 2009.
1833# <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1834# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1835# </a>
1836# According to the article, Creston has not changed its clocks since June 1918.
1837# i.e. Creston has been stuck on UTC-7 for 93 years.
1838# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1839
1840# Unfortunately the exact date for the time change in June 1918 remains
1841# unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1842# ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1843# as plausible as any other date (in June). She also said that after writing the
1844# article she had discovered another time change in 1916; this is the subject
1845# of another article which she wrote in October 2010.
1846# <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1847# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1848# </a>
1849
1850# Here is a summary of the three clock change events in Creston's history:
1851# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1852# Exact date unknown
1853# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1854# Exact date in October unknown; Sunday October 1 is a reasonable guess.
1855# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1856# Exact date in June unknown; Sunday June 2 is a reasonable guess.
1857# note#1:
1858# On Oct 27/1918 when daylight saving ended in the rest of Canada,
1859# Creston did not change its clocks.
1860# note#2:
1861# During WWII when the Federal Government legislated a mandatory clock change,
1862# Creston did not oblige.
1863# note#3:
1864# There is no guarantee that Creston will remain on Mountain Standard Time
1865# (UTC-7) forever.
1866# The subject was debated at least once this year by the town Council.
1867# <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1868# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1869# </a>
1870
1871# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1872# In Creston, that was handled by shifting the area to PST (-8:00) then applying
1873# summer time to cause the offset to be -7:00, the same as it had been before
1874# the change. It can be argued that the timezone abbreviation during this
1875# period should be PDT rather than MST, but that doesn't seem important enough
1876# (to anyone) to further complicate the rules.
1877
1878# The transition dates (and times) are guesses.
1879
1880# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1881Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1882Rule Vanc 1918 only - Oct 27 2:00 0 S
1883Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1884Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1885Rule Vanc 1945 only - Sep 30 2:00 0 S
1886Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1887Rule Vanc 1946 only - Oct 13 2:00 0 S
1888Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1889Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1890# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1891Zone America/Vancouver -8:12:28 - LMT 1884
1892 -8:00 Vanc P%sT 1987
1893 -8:00 Canada P%sT
1894Zone America/Dawson_Creek -8:00:56 - LMT 1884
1895 -8:00 Canada P%sT 1947
1896 -8:00 Vanc P%sT 1972 Aug 30 2:00
1897 -7:00 - MST
1898Zone America/Creston -7:46:04 - LMT 1884
1899 -7:00 - MST 1916 Oct 1
1900 -8:00 - PST 1918 Jun 2
1901 -7:00 - MST
1902
1903# Northwest Territories, Nunavut, Yukon
1904
1905# From Paul Eggert (2006-03-22):
1906# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1907# Mathew Englander (1996-10-07) gives the following refs:
1908# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1909# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1910# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1911# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1912# * O.I.C. 1980/02 established DST.
1913# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1914# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1915# with Englander.
1916# From Chris Walton (2006-06-26):
1917# Here is a link to the old daylight saving portion of the interpretation
1918# act which was last updated in 1987:
1919# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1920
1921# From Rives McDow (1999-09-04):
1922# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1923# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1924# Nunavut moves to single time zone Oct. 31
1925# </a>
1926#
1927# From Antoine Leca (1999-09-06):
1928# We then need to create a new timezone for the Kitikmeot region of Nunavut
1929# to differentiate it from the Yellowknife region.
1930
1931# From Paul Eggert (1999-09-20):
1932# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1933# Basic Facts: The New Territory
1934# </a> (1999) reports that Pangnirtung operates on eastern time,
1935# and that Coral Harbour does not observe DST. We don't know when
1936# Pangnirtung switched to eastern time; we'll guess 1995.
1937
1938# From Rives McDow (1999-11-08):
1939# On October 31, when the rest of Nunavut went to Central time,
1940# Pangnirtung wobbled. Here is the result of their wobble:
1941#
1942# The following businesses and organizations in Pangnirtung use Central Time:
1943#
1944# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1945# Eastern Arctic National Parks, A & D Specialist
1946#
1947# The following businesses and organizations in Pangnirtung use Eastern Time:
1948#
1949# Hamlet office, All other businesses, Both schools, Airport operator
1950#
1951# This has made for an interesting situation there, which warranted the news.
1952# No one there that I spoke with seems concerned, or has plans to
1953# change the local methods of keeping time, as it evidently does not
1954# really interfere with any activities or make things difficult locally.
1955# They plan to celebrate New Year's turn-over twice, one hour apart,
1956# so it appears that the situation will last at least that long.
1957# The Nunavut Intergovernmental Affairs hopes that they will "come to
1958# their senses", but the locals evidently don't see any problem with
1959# the current state of affairs.
1960
1961# From Michaela Rodrigue, writing in the
1962# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1963# Nunatsiaq News (1999-11-19)</a>:
1964# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1965# central - or Nunavut time - for government offices, and eastern time
1966# for municipal offices and schools.... Igloolik [was similar but then]
1967# made the switch to central time on Saturday, Nov. 6.
1968
1969# From Paul Eggert (2000-10-02):
1970# Matthews and Vincent (1998) say the following, but we lack histories
1971# for these potential new Zones.
1972#
1973# The Canadian Forces station at Alert uses Eastern Time while the
1974# handful of residents at the Eureka weather station [in the Central
1975# zone] skip daylight savings. Baffin Island, which is crossed by the
1976# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1977# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1978# Central Time and Southampton Island [in the Central zone] is not
1979# required to use daylight savings.
1980
1981# From
1982# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1983# Nunavut now has two time zones
1984# </a> (2000-11-10):
1985# The Nunavut government would allow its employees in Kugluktuk and
1986# Cambridge Bay to operate on central time year-round, putting them
1987# one hour behind the rest of Nunavut for six months during the winter.
1988# At the end of October the two communities had rebelled against
1989# Nunavut's unified time zone, refusing to shift to eastern time with
1990# the rest of the territory for the winter. Cambridge Bay remained on
1991# central time, while Kugluktuk, even farther west, reverted to
1992# mountain time, which they had used before the advent of Nunavut's
1993# unified time zone in 1999.
1994#
1995# From Rives McDow (2001-01-20), quoting the Nunavut government:
1996# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1997
1998# From Paul Eggert (2000-12-04):
1999# Let's just keep track of the official times for now.
2000
2001# From Rives McDow (2001-03-07):
2002# The premier of Nunavut has issued a ministerial statement advising
2003# that effective 2001-04-01, the territory of Nunavut will revert
2004# back to three time zones (mountain, central, and eastern). Of the
2005# cities in Nunavut, Coral Harbor is the only one that I know of that
2006# has said it will not observe dst, staying on EST year round. I'm
2007# checking for more info, and will get back to you if I come up with
2008# more.
2009# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2010
2011# From Gwillim Law (2005-05-21):
2012# According to maps at
2013# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2014# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2015# (both dated 2003), and
2016# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2017# (from a 1998 Canadian Geographic article), the de facto and de jure time
2018# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2019# round. Using Google, it's easy to find other websites that confirm this.
2020# I wasn't able to find how far back this time regimen goes, but since it
2021# predates the creation of Nunavut, it probably goes back many years....
2022# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2023#
2024# From Paul Eggert (2005-07-26):
2025# For lack of better information, assume that Southampton Island observed
2026# daylight saving only during wartime.
2027
2028# From Chris Walton (2007-03-01):
2029# ... the community of Resolute (located on Cornwallis Island in
2030# Nunavut) moved from Central Time to Eastern Time last November.
2031# Basically the community did not change its clocks at the end of
2032# daylight saving....
2033# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2034
2035# From Chris Walton (2011-03-21):
2036# Back in 2007 I initiated the creation of a new "zone file" for Resolute
2037# Bay. Resolute Bay is a small community located about 900km north of
2038# the Arctic Circle. The zone file was required because Resolute Bay had
2039# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2040#
2041# According to new information which I received last week, Resolute Bay
2042# went back to using UTC-6 in the winter of 2007-2008...
2043#
2044# On March 11/2007 most of Canada went onto daylight saving. On March
2045# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2046# talked to somebody that was both knowledgeable and helpful. I was able
2047# to confirm that Resolute Bay was still operating on UTC-5. It was
2048# explained to me that Resolute Bay had been on the Eastern Time zone
2049# (EST) in the winter, and was now back on the Central Time zone (CDT).
2050# i.e. the time zone had changed twice in the last year but the clocks
2051# had not moved. The residents had to know which time zone they were in
2052# so they could follow the correct TV schedule...
2053#
2054# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2055# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2056# of the phone call, I decided to seek out an alternate source of
2057# information. I found an e-mail address for somebody by the name of
2058# Stephanie Adams whose job was listed as "Inns North Support Officer for
2059# Arctic Co-operatives." I was under the impression that Stephanie lived
2060# and worked in Resolute Bay...
2061#
2062# On March 14/2011 I phoned the hamlet office again. I was told that
2063# Resolute Bay had been using Central Standard Time over the winter of
2064# 2010-2011 and that the clocks had therefore been moved one hour ahead
2065# on March 13/2011. The person I talked to was aware that Resolute Bay
2066# had previously experimented with Eastern Standard Time but he could not
2067# tell me when the practice had stopped.
2068#
2069# On March 17/2011 I searched the Web to find an e-mail address of
2070# somebody that might be able to tell me exactly when Resolute Bay went
2071# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2072# used to be the mayor of Resolute Bay and he apparently owns half the
2073# businesses including "South Camp Inn." This website has some info on
2074# Aziz:
2075# <a href="http://www.uphere.ca/node/493">
2076# http://www.uphere.ca/node/493
2077# </a>
2078#
2079# I sent Aziz an e-mail asking when Resolute Bay had stopped using
2080# Eastern Standard Time.
2081#
2082# Aziz responded quickly with this: "hi, The time was not changed for the
2083# 1 year only, the following year, the community went back to the old way
2084# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2085# the winter Zulu plus 6 hrs"
2086#
2087# This of course conflicted with everything I had ascertained in November 2008.
2088#
2089# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2090# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2091# may want to check with the weather office in Resolute Bay or do a
2092# search on the weather through Env. Canada. web site"
2093#
2094# If I had realized the Stephanie did not live in Resolute Bay I would
2095# never have contacted her. I now believe that all the information I
2096# obtained in November 2008 should be ignored...
2097# I apologize for reporting incorrect information in 2008.
2098
2099# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2100Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2101Rule NT_YK 1918 only - Oct 27 2:00 0 S
2102Rule NT_YK 1919 only - May 25 2:00 1:00 D
2103Rule NT_YK 1919 only - Nov 1 0:00 0 S
2104Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2105Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2106Rule NT_YK 1945 only - Sep 30 2:00 0 S
2107Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2108Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2109Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2110Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2111Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2112# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2113# aka Panniqtuuq
2114Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2115 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2116 -5:00 Canada E%sT 1999 Oct 31 2:00
2117 -6:00 Canada C%sT 2000 Oct 29 2:00
2118 -5:00 Canada E%sT
2119# formerly Frobisher Bay
2120Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2121 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2122 -6:00 Canada C%sT 2000 Oct 29 2:00
2123 -5:00 Canada E%sT
2124# aka Qausuittuq
2125Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute 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 2006 Oct 29 2:00
2129 -5:00 - EST 2007 Mar 11 3:00
2130 -6:00 Canada C%sT
2131# aka Kangiqiniq
2132Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2133 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2134 -5:00 - EST 2001 Apr 1 3:00
2135 -6:00 Canada C%sT
2136# aka Iqaluktuuttiaq
2137Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2138 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2139 -6:00 Canada C%sT 2000 Oct 29 2:00
2140 -5:00 - EST 2000 Nov 5 0:00
2141 -6:00 - CST 2001 Apr 1 3:00
2142 -7:00 Canada M%sT
2143Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2144 -7:00 NT_YK M%sT 1980
2145 -7:00 Canada M%sT
2146Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2147 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2148 -7:00 NT_YK M%sT 1980
2149 -7:00 Canada M%sT
2150Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2151 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2152 -8:00 NT_YK P%sT 1980
2153 -8:00 Canada P%sT
2154Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2155 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2156 -8:00 NT_YK P%sT 1980
2157 -8:00 Canada P%sT
2158
2159
2160###############################################################################
2161
2162# Mexico
2163
2164# From Paul Eggert (2001-03-05):
2165# The Investigation and Analysis Service of the
2166# Mexican Library of Congress (MLoC) has published a
2167# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2168# history of Mexican local time (in Spanish)
2169# </a>.
2170#
2171# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2172# (In all cases we go with the MLoC.)
2173# S&P report that Baja was at -8:00 in 1922/1923.
2174# S&P say the 1930 transition in Baja was 1930-11-16.
2175# S&P report no DST during summer 1931.
2176# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2177
2178# From Gwillim Law (2001-02-20):
2179# There are some other discrepancies between the Decrees page and the
2180# tz database. I think they can best be explained by supposing that
2181# the researchers who prepared the Decrees page failed to find some of
2182# the relevant documents.
2183
2184# From Alan Perry (1996-02-15):
2185# A guy from our Mexico subsidiary finally found the Presidential Decree
2186# outlining the timezone changes in Mexico.
2187#
2188# ------------- Begin Forwarded Message -------------
2189#
2190# I finally got my hands on the Official Presidential Decree that sets up the
2191# rules for the DST changes. The rules are:
2192#
2193# 1. The country is divided in 3 timezones:
2194# - Baja California Norte (the Mexico/BajaNorte TZ)
2195# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2196# - The rest of the country (the Mexico/General TZ)
2197#
2198# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2199# at 2:00 AM, the times in each zone are as follows:
2200# BajaNorte: GMT+7
2201# BajaSur: GMT+6
2202# General: GMT+5
2203#
2204# 3. The rest of the year, the times are as follows:
2205# BajaNorte: GMT+8
2206# BajaSur: GMT+7
2207# General: GMT+6
2208#
2209# The Decree was published in Mexico's Official Newspaper on January 4th.
2210#
2211# -------------- End Forwarded Message --------------
2212# From Paul Eggert (1996-06-12):
2213# For an English translation of the decree, see
2214# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2215# "Diario Oficial: Time Zone Changeover" (1996-01-04).
2216# </a>
2217
2218# From Rives McDow (1998-10-08):
2219# The State of Quintana Roo has reverted back to central STD and DST times
2220# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2221
2222# From Rives McDow (2000-01-10):
2223# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2224# zone 5 hours from the International Date Line, and will not observe daylight
2225# savings time so as to stay on the same time zone as the southern part of
2226# Arizona year round.
2227
2228# From Jesper Norgaard, translating
2229# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2230# In Oaxaca, the 55.000 teachers from the Section 22 of the National
2231# Syndicate of Education Workers, refuse to apply daylight saving each
2232# year, so that the more than 10,000 schools work at normal hour the
2233# whole year.
2234
2235# From Gwillim Law (2001-01-19):
2236# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2237# (translated):...
2238# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2239# that Summer Time will be reduced from seven to five months, starting
2240# this year....
2241# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2242# [translated], says "summer time will ... take effect on the first Sunday
2243# in May, and end on the last Sunday of September.
2244
2245# From Arthur David Olson (2001-01-25):
2246# The 2001-01-24 traditional Washington Post contained the page one
2247# story "Timely Issue Divides Mexicans."...
2248# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2249# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2250# Mexico City and its 20 million residents on a different time than
2251# the rest of the country..." In particular, Lopez Obrador would abolish
2252# observation of Daylight Saving Time.
2253
2254# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2255# Official statute published by the Energy Department
2256# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2257# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2258
2259# From Paul Eggert (2001-03-03):
2260#
2261# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2262# James F. Smith writes in today's LA Times
2263# </a>
2264# * Sonora will continue to observe standard time.
2265# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2266# the Federal District will not adopt DST.
2267# * 4 of 16 district leaders announced they'll ignore the decree.
2268# * The decree does not affect federal-controlled facilities including
2269# the airport, banks, hospitals, and schools.
2270#
2271# For now we'll assume that the Federal District will bow to federal rules.
2272
2273# From Jesper Norgaard (2001-04-01):
2274# I found some references to the Mexican application of daylight
2275# saving, which modifies what I had already sent you, stating earlier
2276# that a number of northern Mexican states would go on daylight
2277# saving. The modification reverts this to only cover Baja California
2278# (Norte), while all other states (except Sonora, who has no daylight
2279# saving all year) will follow the original decree of president
2280# Vicente Fox, starting daylight saving May 6, 2001 and ending
2281# September 30, 2001.
2282# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2283# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2284
2285# From Reuters (2001-09-04):
2286# Mexico's Supreme Court on Tuesday declared that daylight savings was
2287# unconstitutional in Mexico City, creating the possibility the
2288# capital will be in a different time zone from the rest of the nation
2289# next year.... The Supreme Court's ruling takes effect at 2:00
2290# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2291# standard time. "This is so residents of the Federal District are not
2292# subject to unexpected time changes," a statement from the court said.
2293
2294# From Jesper Norgaard Welen (2002-03-12):
2295# ... consulting my local grocery store(!) and my coworkers, they all insisted
2296# that a new decision had been made to reinstate US style DST in Mexico....
2297# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2298# confirms this. Sonora as usual is the only state where DST is not applied.
2299
2300# From Steffen Thorsen (2009-12-28):
2301#
2302# Steffen Thorsen wrote:
2303# > Mexico's House of Representatives has approved a proposal for northern
2304# > Mexico's border cities to share the same daylight saving schedule as
2305# > the United States.
2306# Now this has passed both the Congress and the Senate, so starting from
2307# 2010, some border regions will be the same:
2308# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2309# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2310# </a>
2311# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2312# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2313# </a>
2314# (Spanish)
2315#
2316# Could not find the new law text, but the proposed law text changes are here:
2317# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2318# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2319# </a>
2320# (Gaceta Parlamentaria)
2321#
2322# There is also a list of the votes here:
2323# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2324# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2325# </a>
2326#
2327# Our page:
2328# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2329# http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2330# </a>
2331
2332# From Arthur David Olson (2010-01-20):
2333# The page
2334# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2335# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2336# </a>
2337# includes this text:
2338# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2339# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2340# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2341# Tamaulipas, la aplicación de este horario estacional surtirá efecto
2342# desde las dos horas del segundo domingo de marzo y concluirá a las dos
2343# horas del primer domingo de noviembre.
2344# En los municipios fronterizos que se encuentren ubicados en la franja
2345# fronteriza norte en el territorio comprendido entre la línea
2346# internacional y la línea paralela ubicada a una distancia de veinte
2347# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2348# interior del país, la aplicación de este horario estacional surtirá
2349# efecto desde las dos horas del segundo domingo de marzo y concluirá a
2350# las dos horas del primer domingo de noviembre.
2351
2352# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2353Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2354Rule Mexico 1939 only - Jun 25 0:00 0 S
2355Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2356Rule Mexico 1941 only - Apr 1 0:00 0 S
2357Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2358Rule Mexico 1944 only - May 1 0:00 0 S
2359Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2360Rule Mexico 1950 only - Jul 30 0:00 0 S
2361Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2362Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2363Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2364Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2365Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2366Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2367# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2368# Quintana Roo
2369Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2370 -6:00 - CST 1981 Dec 23
2371 -5:00 Mexico E%sT 1998 Aug 2 2:00
2372 -6:00 Mexico C%sT
2373# Campeche, Yucatan
2374Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2375 -6:00 - CST 1981 Dec 23
2376 -5:00 - EST 1982 Dec 2
2377 -6:00 Mexico C%sT
2378# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2379Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2380 -6:00 - CST 1988
2381 -6:00 US C%sT 1989
2382 -6:00 Mexico C%sT 2010
2383 -6:00 US C%sT
2384# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2385Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2386 -6:00 - CST 1988
2387 -6:00 US C%sT 1989
2388 -6:00 Mexico C%sT
2389# Central Mexico
2390Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2391 -7:00 - MST 1927 Jun 10 23:00
2392 -6:00 - CST 1930 Nov 15
2393 -7:00 - MST 1931 May 1 23:00
2394 -6:00 - CST 1931 Oct
2395 -7:00 - MST 1932 Apr 1
2396 -6:00 Mexico C%sT 2001 Sep 30 02:00
2397 -6:00 - CST 2002 Feb 20
2398 -6:00 Mexico C%sT
2399# Chihuahua (near US border)
2400Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2401 -7:00 - MST 1927 Jun 10 23:00
2402 -6:00 - CST 1930 Nov 15
2403 -7:00 - MST 1931 May 1 23:00
2404 -6:00 - CST 1931 Oct
2405 -7:00 - MST 1932 Apr 1
2406 -6:00 - CST 1996
2407 -6:00 Mexico C%sT 1998
2408 -6:00 - CST 1998 Apr Sun>=1 3:00
2409 -7:00 Mexico M%sT 2010
2410 -7:00 US M%sT
2411# Chihuahua (away from US border)
2412Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2413 -7:00 - MST 1927 Jun 10 23:00
2414 -6:00 - CST 1930 Nov 15
2415 -7:00 - MST 1931 May 1 23:00
2416 -6:00 - CST 1931 Oct
2417 -7:00 - MST 1932 Apr 1
2418 -6:00 - CST 1996
2419 -6:00 Mexico C%sT 1998
2420 -6:00 - CST 1998 Apr Sun>=1 3:00
2421 -7:00 Mexico M%sT
2422# Sonora
2423Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2424 -7:00 - MST 1927 Jun 10 23:00
2425 -6:00 - CST 1930 Nov 15
2426 -7:00 - MST 1931 May 1 23:00
2427 -6:00 - CST 1931 Oct
2428 -7:00 - MST 1932 Apr 1
2429 -6:00 - CST 1942 Apr 24
2430 -7:00 - MST 1949 Jan 14
2431 -8:00 - PST 1970
2432 -7:00 Mexico M%sT 1999
2433 -7:00 - MST
2434
2435# From Alexander Krivenyshev (2010-04-21):
2436# According to news, Bahía de Banderas (Mexican state of Nayarit)
2437# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2438# share the same time zone as nearby city Puerto Vallarta, Jalisco).
2439#
2440# (Spanish)
2441# Bahía de Banderas homologa su horario al del centro del
2442# país, a partir de este domingo
2443# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2444# http://www.nayarit.gob.mx/notes.asp?id=20748
2445# </a>
2446#
2447# Bahía de Banderas homologa su horario con el del Centro del
2448# País
2449# <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">
2450# 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"
2451# </a>
2452#
2453# (English)
2454# Puerto Vallarta and Bahía de Banderas: One Time Zone
2455# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2456# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2457# </a>
2458#
2459# or
2460# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2461# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2462# </a>
2463#
2464# "Mexico's Senate approved the amendments to the Mexican Schedule System that
2465# will allow Bahía de Banderas and Puerto Vallarta to share the same time
2466# zone ..."
2467# Baja California Sur, Nayarit, Sinaloa
2468
2469# From Arthur David Olson (2010-05-01):
2470# Use "Bahia_Banderas" to keep the name to fourteen characters.
2471
2472Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2473 -7:00 - MST 1927 Jun 10 23:00
2474 -6:00 - CST 1930 Nov 15
2475 -7:00 - MST 1931 May 1 23:00
2476 -6:00 - CST 1931 Oct
2477 -7:00 - MST 1932 Apr 1
2478 -6:00 - CST 1942 Apr 24
2479 -7:00 - MST 1949 Jan 14
2480 -8:00 - PST 1970
2481 -7:00 Mexico M%sT
2482
2483Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2484 -7:00 - MST 1927 Jun 10 23:00
2485 -6:00 - CST 1930 Nov 15
2486 -7:00 - MST 1931 May 1 23:00
2487 -6:00 - CST 1931 Oct
2488 -7:00 - MST 1932 Apr 1
2489 -6:00 - CST 1942 Apr 24
2490 -7:00 - MST 1949 Jan 14
2491 -8:00 - PST 1970
2492 -7:00 Mexico M%sT 2010 Apr 4 2:00
2493 -6:00 Mexico C%sT
2494
2495# Baja California (near US border)
2496Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2497 -7:00 - MST 1924
2498 -8:00 - PST 1927 Jun 10 23:00
2499 -7:00 - MST 1930 Nov 15
2500 -8:00 - PST 1931 Apr 1
2501 -8:00 1:00 PDT 1931 Sep 30
2502 -8:00 - PST 1942 Apr 24
2503 -8:00 1:00 PWT 1945 Aug 14 23:00u
2504 -8:00 1:00 PPT 1945 Nov 12 # Peace
2505 -8:00 - PST 1948 Apr 5
2506 -8:00 1:00 PDT 1949 Jan 14
2507 -8:00 - PST 1954
2508 -8:00 CA P%sT 1961
2509 -8:00 - PST 1976
2510 -8:00 US P%sT 1996
2511 -8:00 Mexico P%sT 2001
2512 -8:00 US P%sT 2002 Feb 20
2513 -8:00 Mexico P%sT 2010
2514 -8:00 US P%sT
2515# Baja California (away from US border)
2516Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2517 -7:00 - MST 1924
2518 -8:00 - PST 1927 Jun 10 23:00
2519 -7:00 - MST 1930 Nov 15
2520 -8:00 - PST 1931 Apr 1
2521 -8:00 1:00 PDT 1931 Sep 30
2522 -8:00 - PST 1942 Apr 24
2523 -8:00 1:00 PWT 1945 Aug 14 23:00u
2524 -8:00 1:00 PPT 1945 Nov 12 # Peace
2525 -8:00 - PST 1948 Apr 5
2526 -8:00 1:00 PDT 1949 Jan 14
2527 -8:00 - PST 1954
2528 -8:00 CA P%sT 1961
2529 -8:00 - PST 1976
2530 -8:00 US P%sT 1996
2531 -8:00 Mexico P%sT 2001
2532 -8:00 US P%sT 2002 Feb 20
2533 -8:00 Mexico P%sT
2534# From Paul Eggert (2006-03-22):
2535# Formerly there was an America/Ensenada zone, which differed from
2536# America/Tijuana only in that it did not observe DST from 1976
2537# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2538# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2539# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2540# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2541# DST-observance was a town-by-town matter back then. This concerns
2542# data after 1970 so most likely there should be at least one Zone
2543# other than America/Tijuana for Baja, but it's not clear yet what its
2544# name or contents should be.
2545#
2546# Revillagigedo Is
2547# no information
2548
2549###############################################################################
2550
2551# Anguilla
2552# See 'southamerica'.
2553
2554# Antigua and Barbuda
2555# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2556Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2557 -5:00 - EST 1951
2558 -4:00 - AST
2559
2560# Bahamas
2561#
2562# For 1899 Milne gives -5:09:29.5; round that.
2563#
2564# From Sue Williams (2006-12-07):
2565# The Bahamas announced about a month ago that they plan to change their DST
2566# rules to sync with the U.S. starting in 2007....
2567# http://www.jonesbahamas.com/?c=45&a=10412
2568
2569# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2570Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2571Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2572# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2573Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2574 -5:00 Bahamas E%sT 1976
2575 -5:00 US E%sT
2576
2577# Barbados
2578
2579# For 1899 Milne gives -3:58:29.2; round that.
2580
2581# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2582Rule Barb 1977 only - Jun 12 2:00 1:00 D
2583Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2584Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2585Rule Barb 1979 only - Sep 30 2:00 0 S
2586Rule Barb 1980 only - Sep 25 2:00 0 S
2587# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2588Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2589 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2590 -4:00 Barb A%sT
2591
2592# Belize
2593# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2594# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2595Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2596Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2597Rule Belize 1973 only - Dec 5 0:00 1:00 D
2598Rule Belize 1974 only - Feb 9 0:00 0 S
2599Rule Belize 1982 only - Dec 18 0:00 1:00 D
2600Rule Belize 1983 only - Feb 12 0:00 0 S
2601# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2602Zone America/Belize -5:52:48 - LMT 1912 Apr
2603 -6:00 Belize C%sT
2604
2605# Bermuda
2606
2607# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2608# Bermuda dockyard, Ireland I; round that.
2609
2610# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2611
2612# Next year, however, clocks in the US will go forward on the second Sunday
2613# in March, until the first Sunday in November. And, after the Time Zone
2614# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2615# Friday, the same thing will happen in Bermuda.
2616# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2617
2618# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2619Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2620 -4:00 - AST 1974 Apr 28 2:00
2621 -4:00 Canada A%sT 1976
2622 -4:00 US A%sT
2623
2624# Cayman Is
2625# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2626Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2627 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2628 -5:00 - EST
2629
2630# Costa Rica
2631
2632# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2633
2634# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2635Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2636Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2637Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2638# IATA SSIM (1991-09) says the following was at 1:00;
2639# go with Shanks & Pottenger.
2640Rule CR 1991 only - Jul 1 0:00 0 S
2641Rule CR 1992 only - Mar 15 0:00 0 S
2642# There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2644Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2645 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2646 -6:00 CR C%sT
2647# Coco
2648# no information; probably like America/Costa_Rica
2649
2650# Cuba
2651
2652# From Paul Eggert (2013-02-21):
2653# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2654# for the port, and -5:30 for meteorological observations.
2655# For now, stick with Shanks & Pottenger.
2656
2657# From Arthur David Olson (1999-03-29):
2658# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2659# the Cuban National Team and the Baltimore Orioles was carried live on
2660# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2661# During the game, play-by-play announcer Jim Hunter noted that
2662# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2663# Time today." (The "two hour" remark referred to losing one hour of
2664# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2665# to DST--and one more hour on 1999-04-04--when the announcers will have
2666# returned to Baltimore, which switches on that date.)
2667
2668# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2669# Cuba is not going back to standard time this year.
2670# From Paul Eggert (2006-03-22):
2671# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2672# says that it's due to a problem at the Antonio Guiteras
2673# thermoelectric plant, and says "This October there will be no return
2674# to normal hours (after daylight saving time)".
2675# For now, let's assume that it's a temporary measure.
2676
2677# From Carlos A. Carnero Delgado (2005-11-12):
2678# This year (just like in 2004-2005) there's no change in time zone
2679# adjustment in Cuba. We will stay in daylight saving time:
2680# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2681
2682# From Jesper Norgaard Welen (2006-10-21):
2683# An article in GRANMA INTERNACIONAL claims that Cuba will end
2684# the 3 years of permanent DST next weekend, see
2685# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2686# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2687# watches should be set back one hour -- going back to 00:00 hours -- returning
2688# to the normal schedule....
2689
2690# From Paul Eggert (2007-03-02):
2691# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2692# says Cuban clocks will advance at midnight on March 10.
2693# For lack of better information, assume Cuba will use US rules,
2694# except that it switches at midnight standard time as usual.
2695#
2696# From Steffen Thorsen (2007-10-25):
2697# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2698# earlier - on the last Sunday of October, just like in 2006.
2699#
2700# He supplied these references:
2701#
2702# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2703# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2704#
2705# From Alex Kryvenishev (2007-10-25):
2706# Here is also article from Granma (Cuba):
2707#
2708# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2709# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2710#
2711# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2712
2713# From Arthur David Olson (2008-03-09):
2714# I'm in Maryland which is now observing United States Eastern Daylight
2715# Time. At 9:44 local time I used RealPlayer to listen to
2716# <a href="http://media.enet.cu/radioreloj">
2717# http://media.enet.cu/radioreloj
2718# </a>, a Cuban information station, and heard
2719# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2720# indicating that Cuba is still on standard time.
2721
2722# From Steffen Thorsen (2008-03-12):
2723# It seems that Cuba will start DST on Sunday, 2007-03-16...
2724# It was announced yesterday, according to this source (in Spanish):
2725# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2726# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2727# </a>
2728#
2729# Some more background information is posted here:
2730# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2731# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2732# </a>
2733#
2734# The article also says that Cuba has been observing DST since 1963,
2735# while Shanks (and tzdata) has 1965 as the first date (except in the
2736# 1940's). Many other web pages in Cuba also claim that it has been
2737# observed since 1963, but with the exception of 1970 - an exception
2738# which is not present in tzdata/Shanks. So there is a chance we need to
2739# change some historic records as well.
2740#
2741# One example:
2742# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2743# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2744# </a>
2745
2746# From Jesper Norgaard Welen (2008-03-13):
2747# The Cuban time change has just been confirmed on the most authoritative
2748# web site, the Granma. Please check out
2749# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2750# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2751# </a>
2752#
2753# Basically as expected after Steffen Thorsens information, the change
2754# will take place midnight between Saturday and Sunday.
2755
2756# From Arthur David Olson (2008-03-12):
2757# Assume Sun>=15 (third Sunday) going forward.
2758
2759# From Alexander Krivenyshev (2009-03-04)
2760# According to the Radio Reloj - Cuba will start Daylight Saving Time on
2761# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2762# not on midnight March 14 / March 15 as previously thought.
2763#
2764# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2765# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2766# (in Spanish)
2767# </a>
2768
2769# From Arthur David Olson (2009-03-09)
2770# I listened over the Internet to
2771# <a href="http://media.enet.cu/readioreloj">
2772# http://media.enet.cu/readioreloj
2773# </a>
2774# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2775# the time was announced as "diez cinco"--the same time as here, indicating
2776# that has indeed switched to DST. Assume second Sunday from 2009 forward.
2777
2778# From Steffen Thorsen (2011-03-08):
2779# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2780# this year. Nothing about the end date known so far (if that has
2781# changed at all).
2782#
2783# Source:
2784# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2785# http://granma.co.cu/2011/03/08/nacional/artic01.html
2786# </a>
2787#
2788# Our info:
2789# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2790# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2791# </a>
2792#
2793# From Steffen Thorsen (2011-10-30)
2794# Cuba will end DST two weeks later this year. Instead of going back
2795# tonight, it has been delayed to 2011-11-13 at 01:00.
2796#
2797# One source (Spanish)
2798# <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2799# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2800# </a>
2801#
2802# Our page:
2803# <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2804# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2805# </a>
2806#
2807# From Steffen Thorsen (2012-03-01)
2808# According to Radio Reloj, Cuba will start DST on Midnight between March
2809# 31 and April 1.
2810#
2811# Radio Reloj has the following info (Spanish):
2812# <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">
2813# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2814# </a>
2815#
2816# Our info on it:
2817# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2818# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2819# </a>
2820
2821# From Steffen Thorsen (2012-11-03):
2822# Radio Reloj and many other sources report that Cuba is changing back
2823# to standard time on 2012-11-04:
2824# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2825# From Paul Eggert (2012-11-03):
2826# For now, assume the future rule is first Sunday in November.
2827
2828# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2829Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2830Rule Cuba 1928 only - Oct 10 0:00 0 S
2831Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2832Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2833Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2834Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2835Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2836Rule Cuba 1965 only - Sep 30 0:00 0 S
2837Rule Cuba 1966 only - May 29 0:00 1:00 D
2838Rule Cuba 1966 only - Oct 2 0:00 0 S
2839Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2840Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2841Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2842Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2843Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2844Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2845Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2846Rule Cuba 1978 only - May 7 0:00 1:00 D
2847Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2848Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2849Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2850Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2851Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2852Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2853Rule Cuba 1996 only - Oct 6 0:00s 0 S
2854Rule Cuba 1997 only - Oct 12 0:00s 0 S
2855Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2856Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2857Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2858Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2859Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2860Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2861Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2862Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2863Rule Cuba 2011 only - Nov 13 0:00s 0 S
2864Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2865Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2866Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2867
2868# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2869Zone America/Havana -5:29:28 - LMT 1890
2870 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2871 -5:00 Cuba C%sT
2872
2873# Dominica
2874# See 'southamerica'.
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# Guadeloupe
2924# St Barthelemy
2925# St Martin (French part)
2926# See 'southamerica'.
2927
2928# Guatemala
2929#
2930# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2931# Diario Co Latino, at
2932# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2933# says in an article dated 2006-04-19 that the Guatemalan government had
2934# decided on that date to advance official time by 60 minutes, to lessen the
2935# impact of the elevated cost of oil.... Daylight saving time will last from
2936# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2937# From Paul Eggert (2006-06-22):
2938# The Ministry of Energy and Mines, press release CP-15/2006
2939# (2006-04-19), says DST ends at 24:00. See
2940# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2941
2942# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2943Rule Guat 1973 only - Nov 25 0:00 1:00 D
2944Rule Guat 1974 only - Feb 24 0:00 0 S
2945Rule Guat 1983 only - May 21 0:00 1:00 D
2946Rule Guat 1983 only - Sep 22 0:00 0 S
2947Rule Guat 1991 only - Mar 23 0:00 1:00 D
2948Rule Guat 1991 only - Sep 7 0:00 0 S
2949Rule Guat 2006 only - Apr 30 0:00 1:00 D
2950Rule Guat 2006 only - Oct 1 0:00 0 S
2951# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2952Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2953 -6:00 Guat C%sT
2954
2955# Haiti
2956# From Gwillim Law (2005-04-15):
2957# Risto O. Nykanen wrote me that Haiti is now on DST.
2958# I searched for confirmation, and I found a
2959# <a href="http://www.haitianconsulate.org/time.doc"> press release
2960# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2961# </a>. Translated from French, it says:
2962#
2963# "The Prime Minister's Communication Office notifies the public in general
2964# and the press in particular that, following a decision of the Interior
2965# Ministry and the Territorial Collectivities [I suppose that means the
2966# provinces], Haiti will move to Eastern Daylight Time in the night from next
2967# Saturday the 2nd to Sunday the 3rd.
2968#
2969# "Consequently, the Prime Minister's Communication Office wishes to inform
2970# the population that the country's clocks will be set forward one hour
2971# starting at midnight. This provision will hold until the last Saturday in
2972# October 2005.
2973#
2974# "Port-au-Prince, March 31, 2005"
2975#
2976# From Steffen Thorsen (2006-04-04):
2977# I have been informed by users that Haiti observes DST this year like
2978# last year, so the current "only" rule for 2005 might be changed to a
2979# "max" rule or to last until 2006. (Who knows if they will observe DST
2980# next year or if they will extend their DST like US/Canada next year).
2981#
2982# I have found this article about it (in French):
2983# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2984#
2985# The reason seems to be an energy crisis.
2986
2987# From Stephen Colebourne (2007-02-22):
2988# Some IATA info: Haiti won't be having DST in 2007.
2989
2990# From Steffen Thorsen (2012-03-11):
2991# According to several news sources, Haiti will observe DST this year,
2992# apparently using the same start and end date as USA/Canada.
2993# So this means they have already changed their time.
2994#
2995# http://www.alterpresse.org/spip.php?article12510
2996# http://radiovision2000haiti.net/home/?p=13253
2997#
2998# From Arthur David Olson (2012-03-11):
2999# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3000# 3:00 a.m. rather than the traditional Haitian jump at midnight.
3001# Assume a US-style fall back as well.
3002
3003# From Steffen Thorsen (2013-03-10):
3004# It appears that Haiti is observing DST this year as well, same rules
3005# as US/Canada. They did it last year as well, and it looks like they
3006# are going to observe DST every year now...
3007#
3008# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3009# http://www.canalplushaiti.net/?p=6714
3010
3011# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3012Rule Haiti 1983 only - May 8 0:00 1:00 D
3013Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3014Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3015# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3016# Go with IATA.
3017Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3018Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3019Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3020Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3021Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3022Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3023# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3024Zone America/Port-au-Prince -4:49:20 - LMT 1890
3025 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3026 -5:00 Haiti E%sT
3027
3028# Honduras
3029# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3030
3031# From Paul Eggert (2006-05-05):
3032# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3033# saying Honduras will start using DST midnight Saturday, effective 4
3034# months until September. La Tribuna reported today
3035# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3036# of Honduras, refused to back down on this.
3037
3038# From Jesper Norgaard Welen (2006-08-08):
3039# It seems that Honduras has returned from DST to standard time this Monday at
3040# 00:00 hours (prolonging Sunday to 25 hours duration).
3041# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3042
3043# From Paul Eggert (2006-08-08):
3044# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3045# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3046# It mentions executive decree 18-2006.
3047
3048# From Steffen Thorsen (2006-08-17):
3049# Honduras will observe DST from 2007 to 2009, exact dates are not
3050# published, I have located this authoritative source:
3051# http://www.presidencia.gob.hn/noticia.aspx?nId=47
3052
3053# From Steffen Thorsen (2007-03-30):
3054# http://www.laprensahn.com/pais_nota.php?id04962=7386
3055# So it seems that Honduras will not enter DST this year....
3056
3057# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3058Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3059Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3060Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3061Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3063Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3064 -6:00 Hond C%sT
3065#
3066# Great Swan I ceded by US to Honduras in 1972
3067
3068# Jamaica
3069# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3070# unspecified official document, and says "This time is used throughout the
3071# island". Go with Milne. Round to the nearest second as required by zic.
3072# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3073Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3074 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3075 -5:00 - EST 1974 Apr 28 2:00
3076 -5:00 US E%sT 1984
3077 -5:00 - EST
3078
3079# Martinique
3080# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3081Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3082 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3083 -4:00 - AST 1980 Apr 6
3084 -4:00 1:00 ADT 1980 Sep 28
3085 -4:00 - AST
3086
3087# Montserrat
3088# See 'southamerica'.
3089
3090# Nicaragua
3091#
3092# This uses Shanks & Pottenger for times before 2005.
3093#
3094# From Steffen Thorsen (2005-04-12):
3095# I've got reports from 8 different people that Nicaragua just started
3096# DST on Sunday 2005-04-10, in order to save energy because of
3097# expensive petroleum. The exact end date for DST is not yet
3098# announced, only "September" but some sites also say "mid-September".
3099# Some background information is available on the President's official site:
3100# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3101# The Decree, no 23-2005 is available here:
3102# 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
3103#
3104# From Paul Eggert (2005-05-01):
3105# The decree doesn't say anything about daylight saving, but for now let's
3106# assume that it is daylight saving....
3107#
3108# From Gwillim Law (2005-04-21):
3109# The Associated Press story on the time change, which can be found at
3110# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3111# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3112# time that a change of clocks was applied to save energy was in the year 2000
3113# during the Arnoldo Aleman administration."...
3114# The northamerica file says that Nicaragua has been on UTC-6 continuously
3115# since December 1998. I wasn't able to find any details of Nicaraguan time
3116# changes in 2000. Perhaps a note could be added to the northamerica file, to
3117# the effect that we have indirect evidence that DST was observed in 2000.
3118#
3119# From Jesper Norgaard Welen (2005-11-02):
3120# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3121# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3122# (2005-09-26)
3123#
3124# From Jesper Norgaard Welen (2006-05-05):
3125# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3126# (my informal translation)
3127# By order of the president of the republic, Enrique Bolanos, Nicaragua
3128# advanced by sixty minutes their official time, yesterday at 2 in the
3129# morning, and will stay that way until 30.th. of september.
3130#
3131# From Jesper Norgaard Welen (2006-09-30):
3132# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3133# My informal translation runs:
3134# The natural sun time is restored in all the national territory, in that the
3135# time is returned one hour at 01:00 am of October 1 of 2006.
3136#
3137# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3138Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3139Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3140Rule Nic 2005 only - Apr 10 0:00 1:00 D
3141Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3142Rule Nic 2006 only - Apr 30 2:00 1:00 D
3143Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3144# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3145Zone America/Managua -5:45:08 - LMT 1890
3146 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3147 -6:00 - CST 1973 May
3148 -5:00 - EST 1975 Feb 16
3149 -6:00 Nic C%sT 1992 Jan 1 4:00
3150 -5:00 - EST 1992 Sep 24
3151 -6:00 - CST 1993
3152 -5:00 - EST 1997
3153 -6:00 Nic C%sT
3154
3155# Panama
3156# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3157Zone America/Panama -5:18:08 - LMT 1890
3158 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3159 -5:00 - EST
3160
3161# Puerto Rico
3162# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3163# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3164Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3165 -4:00 - AST 1942 May 3
3166 -4:00 US A%sT 1946
3167 -4:00 - AST
3168
3169# St Kitts-Nevis
3170# St Lucia
3171# See 'southamerica'.
3172
3173# St Pierre and Miquelon
3174# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3175# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3176Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3177 -4:00 - AST 1980 May
3178 -3:00 - PMST 1987 # Pierre & Miquelon Time
3179 -3:00 Canada PM%sT
3180
3181# St Vincent and the Grenadines
3182# See 'southamerica'.
3183
3184# Turks and Caicos
3185#
3186# From Chris Dunn in
3187# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3188# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3189# daylight saving dates for time changes have been adjusted to match
3190# the recent U.S. change of dates.
3191#
3192# From Brian Inglis (2007-04-28):
3193# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3194# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3195# rows before that there is an out of date entry for Oct:
3196# "Eastern Standard Times Begins 2007
3197# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3198# indicating that the normal ET rules are followed.
3199#
3200# From Paul Eggert (2006-05-01):
3201# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3202# says they switch at midnight. Go with Shanks & Pottenger.
3203#
3204# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3205Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3206Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3207Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3208Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3209Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3211Zone America/Grand_Turk -4:44:32 - LMT 1890
3212 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3213 -5:00 TC E%sT
3214
3215# British Virgin Is
3216# Virgin Is
3217# See 'southamerica'.