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