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1# <pre>
2# @(#)northamerica 8.41
2# @(#)northamerica 8.42
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
472Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
473 -8:57:41 - LMT 1900 Aug 20 12:00
474 -8:00 - PST 1942
475 -8:00 US P%sT 1946
476 -8:00 - PST 1969
477 -8:00 US P%sT 1980 Apr 27 2:00
478 -9:00 US Y%sT 1980 Oct 26 2:00
479 -8:00 US P%sT 1983 Oct 30 2:00
480 -9:00 US Y%sT 1983 Nov 30
481 -9:00 US AK%sT
482Zone America/Sitka -14:58:47 - LMT 1867 Oct 18
483 -9:01:13 - LMT 1900 Aug 20 12:00
484 -8:00 - PST 1942
485 -8:00 US P%sT 1946
486 -8:00 - PST 1969
487 -8:00 US P%sT 1983 Oct 30 2:00
488 -9:00 US Y%sT 1983 Nov 30
489 -9:00 US AK%sT
490Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
491 -8:46:18 - LMT 1900 Aug 20 12:00
492 -8:00 - PST 1942
493 -8:00 US P%sT 1946
494 -8:00 - PST 1969
495 -8:00 US P%sT 1983 Oct 30 2:00
496 -8:00 US MeST
497Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
498 -9:18:55 - LMT 1900 Aug 20 12:00
499 -9:00 - YST 1942
500 -9:00 US Y%sT 1946
501 -9:00 - YST 1969
502 -9:00 US Y%sT 1983 Nov 30
503 -9:00 US AK%sT
504Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
505 -9:59:36 - LMT 1900 Aug 20 12:00
506 -10:00 - CAT 1942
507 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
508 -10:00 US CAT/CAPT 1946 # Peace
509 -10:00 - CAT 1967 Apr
510 -10:00 - AHST 1969
511 -10:00 US AH%sT 1983 Oct 30 2:00
512 -9:00 US Y%sT 1983 Nov 30
513 -9:00 US AK%sT
514Zone America/Nome 12:58:21 - LMT 1867 Oct 18
515 -11:01:38 - LMT 1900 Aug 20 12:00
516 -11:00 - NST 1942
517 -11:00 US N%sT 1946
518 -11:00 - NST 1967 Apr
519 -11:00 - BST 1969
520 -11:00 US B%sT 1983 Oct 30 2:00
521 -9:00 US Y%sT 1983 Nov 30
522 -9:00 US AK%sT
523Zone America/Adak 12:13:21 - LMT 1867 Oct 18
524 -11:46:38 - LMT 1900 Aug 20 12:00
525 -11:00 - NST 1942
526 -11:00 US N%sT 1946
527 -11:00 - NST 1967 Apr
528 -11:00 - BST 1969
529 -11:00 US B%sT 1983 Oct 30 2:00
530 -10:00 US AH%sT 1983 Nov 30
531 -10:00 US HA%sT
532# The following switches don't quite make our 1970 cutoff.
533#
534# Shanks writes that part of southwest Alaska (e.g. Aniak)
535# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
536# and another part (e.g. Akiak) made the same switch five weeks later.
537#
538# From David Flater (2004-11-09):
539# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
540# Historic Preservation Commission, provided this information, which
541# suggests that Unalaska deviated from statutory time from early 1967
542# possibly until 1983:
543#
544# Minutes of the Unalaska City Council Meeting, January 10, 1967:
545# "Except for St. Paul and Akutan, Unalaska is the only important
546# location not on Alaska Standard Time. The following resolution was
547# made by William Robinson and seconded by Henry Swanson: Be it
548# resolved that the City of Unalaska hereby goes to Alaska Standard
549# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
550# January 14, Alaska Standard Time.) This resolution was passed with
551# three votes for and one against."
552
553# Hawaii
554
555# From Arthur David Olson (2010-12-09):
556# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
557# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
558# the article is available at
559# <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
560# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
561# </a>
562# and indicates that standard time was adopted effective noon, January
563# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
564# saving for the period between the last Sunday of each April and the
565# last Sunday of each September, but less than a month later repealed the
566# act," (page 220), that year-round daylight saving time was in effect
567# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
568# when clocks changed) and that clocks were changed by 30 minutes
569# effective the second Sunday of June, 1947 (page 219, with no time of
570# day given for when clocks changed). A footnote for the 1933 changes
571# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
572# and Act 163 (approved 21 May 1933)."
573
574# From Arthur David Olson (2011-01-19):
575# The following is from "Laws of the Territory of Hawaii Passed by the
576# Seventeenth Legislature: Regular Session 1933," available (as of
577# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
578# 90...At 2 o'clock ante meridian of the last Sunday in April of each
579# year, the standard time of this Territory shall be advanced one
580# hour...This Act shall take effect upon its approval. Approved this 26th
581# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
582# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
583# hereby repealed...This Act shall take effect upon its approval, upon
584# which date the standard time of this Territory shall be restored to
585# that existing immediately prior to the taking effect of said Act 90.
586# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
587# of the Territory of Hawaii."
588#
589# Note that 1933-05-21 was a Sunday.
590# We're left to guess the time of day when Act 163 was approved; guess noon.
591
592Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
593 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
594 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
595 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
596 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Fox+2
597 -10:30 US H%sT 1947 Jun 8 2:00 #Schmitt&Fox+2
598 -10:00 - HST
599
600# Now we turn to US areas that have diverged from the consensus since 1970.
601
602# Arizona mostly uses MST.
603
604# From Paul Eggert (2002-10-20):
605#
606# The information in the rest of this paragraph is derived from the
607# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
608# Daylight Saving Time web page (2002-01-23)</a> maintained by the
609# Arizona State Library, Archives and Public Records.
610# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
611# time, but by federal law railroads, airlines, bus lines, military
612# personnel, and some engaged in interstate commerce continued to
613# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
614# Gazette says that was the date the law changed, and that 04-01 was
615# the date the state's clocks would change. In 1945 the State of
616# Arizona used standard time all year, again with exceptions only as
617# mandated by federal law. Arizona observed DST in 1967, but Arizona
618# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
619#
620# Shanks says the 1944 experiment came to an end on 1944-03-17.
621# Go with the Arizona State Library instead.
622
623Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
624 -7:00 US M%sT 1944 Jan 1 00:01
625 -7:00 - MST 1944 Apr 1 00:01
626 -7:00 US M%sT 1944 Oct 1 00:01
627 -7:00 - MST 1967
628 -7:00 US M%sT 1968 Mar 21
629 -7:00 - MST
630# From Arthur David Olson (1988-02-13):
631# A writer from the Inter Tribal Council of Arizona, Inc.,
632# notes in private correspondence dated 1987-12-28 that "Presently, only the
633# Navajo Nation participates in the Daylight Saving Time policy, due to its
634# large size and location in three states." (The "only" means that other
635# tribal nations don't use DST.)
636
637Link America/Denver America/Shiprock
638
639# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
640# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
641# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
642# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
643# Teton, Twin Falls, Valley, Washington counties, and the southern
644# quarter of Idaho county) and eastern Oregon (most of Malheur County)
645# switched four weeks late in 1974.
646#
647# Zone NAME GMTOFF RULES FORMAT [UNTIL]
648Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
649 -8:00 US P%sT 1923 May 13 2:00
650 -7:00 US M%sT 1974
651 -7:00 - MST 1974 Feb 3 2:00
652 -7:00 US M%sT
653
654# Indiana
655#
656# For a map of Indiana's time zone regions, see:
657# <a href="http://www.mccsc.edu/time.html">
658# What time is it in Indiana?
659# </a> (2006-03-01)
660#
661# From Paul Eggert (2007-08-17):
662# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
663# with the following exceptions:
664#
665# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
666# Vandenburgh, and Warrick counties have been like America/Chicago.
667#
668# - Dearborn and Ohio counties have been like America/New_York.
669#
670# - Clark, Floyd, and Harrison counties have been like
671# America/Kentucky/Louisville.
672#
673# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
674# and Switzerland counties have their own time zone histories as noted below.
675#
676# Shanks partitioned Indiana into 345 regions, each with its own time history,
677# and wrote ``Even newspaper reports present contradictory information.''
678# Those Hoosiers! Such a flighty and changeable people!
679# Fortunately, most of the complexity occurred before our cutoff date of 1970.
680#
681# Other than Indianapolis, the Indiana place names are so nondescript
682# that they would be ambiguous if we left them at the `America' level.
683# So we reluctantly put them all in a subdirectory `America/Indiana'.
684
685# From Paul Eggert (2005-08-16):
686# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
687
688# From Nathan Stratton Treadway (2006-03-30):
689# http://www.dot.gov/affairs/dot0406.htm [3705 B]
690# From Deborah Goldsmith (2006-01-18):
691# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
692# From Paul Eggert (2006-01-20):
693# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
694# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
695# Eastern Time Zone to the Central Time Zone.... The effective date of
696# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
697# changeover date from standard time to Daylight Saving Time."
698# Strictly speaking, this means the affected counties will change their
699# clocks twice that night, but this obviously is in error. The intent
700# is that 01:59:59 EST be followed by 02:00:00 CDT.
701
702# From Gwillim Law (2007-02-10):
703# The Associated Press has been reporting that Pulaski County, Indiana is
704# going to switch from Central to Eastern Time on March 11, 2007....
705# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
706
707# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
708Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
709Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
710Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
711# Zone NAME GMTOFF RULES FORMAT [UNTIL]
712Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
713 -6:00 US C%sT 1920
714 -6:00 Indianapolis C%sT 1942
715 -6:00 US C%sT 1946
716 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
717 -5:00 - EST 1957 Sep 29 2:00
718 -6:00 - CST 1958 Apr 27 2:00
719 -5:00 - EST 1969
720 -5:00 US E%sT 1971
721 -5:00 - EST 2006
722 -5:00 US E%sT
723#
724# Eastern Crawford County, Indiana, left its clocks alone in 1974,
725# as well as from 1976 through 2005.
726# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
727Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
728Rule Marengo 1951 only - Sep lastSun 2:00 0 S
729Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
730Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
731# Zone NAME GMTOFF RULES FORMAT [UNTIL]
732Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
733 -6:00 US C%sT 1951
734 -6:00 Marengo C%sT 1961 Apr 30 2:00
735 -5:00 - EST 1969
736 -5:00 US E%sT 1974 Jan 6 2:00
737 -6:00 1:00 CDT 1974 Oct 27 2:00
738 -5:00 US E%sT 1976
739 -5:00 - EST 2006
740 -5:00 US E%sT
741#
742# Daviess, Dubois, Knox, and Martin Counties, Indiana,
743# switched from eastern to central time in April 2006, then switched back
744# in November 2007.
745# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
746Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
747Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
748Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
749Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
750Rule Vincennes 1955 only - May 1 0:00 1:00 D
751Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
752Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
753Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
754Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
755# Zone NAME GMTOFF RULES FORMAT [UNTIL]
756Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
757 -6:00 US C%sT 1946
758 -6:00 Vincennes C%sT 1964 Apr 26 2:00
759 -5:00 - EST 1969
760 -5:00 US E%sT 1971
761 -5:00 - EST 2006 Apr 2 2:00
762 -6:00 US C%sT 2007 Nov 4 2:00
763 -5:00 US E%sT
764#
765# Perry County, Indiana, switched from eastern to central time in April 2006.
766# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
767Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
768Rule Perry 1946 only - Sep lastSun 2:00 0 S
769Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
770Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
771Rule Perry 1955 only - May 1 0:00 1:00 D
772Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
773Rule Perry 1960 only - Oct lastSun 2:00 0 S
774Rule Perry 1961 only - Sep lastSun 2:00 0 S
775Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
776# Zone NAME GMTOFF RULES FORMAT [UNTIL]
777Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
778 -6:00 US C%sT 1946
779 -6:00 Perry C%sT 1964 Apr 26 2:00
780 -5:00 - EST 1969
781 -5:00 US E%sT 1971
782 -5:00 - EST 2006 Apr 2 2:00
783 -6:00 US C%sT
784#
785# Pike County, Indiana moved from central to eastern time in 1977,
786# then switched back in 2006, then switched back again in 2007.
787# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
788Rule Pike 1955 only - May 1 0:00 1:00 D
789Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
790Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
791Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
792# Zone NAME GMTOFF RULES FORMAT [UNTIL]
793Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
794 -6:00 US C%sT 1955
795 -6:00 Pike C%sT 1965 Apr 25 2:00
796 -5:00 - EST 1966 Oct 30 2:00
797 -6:00 US C%sT 1977 Oct 30 2:00
798 -5:00 - EST 2006 Apr 2 2:00
799 -6:00 US C%sT 2007 Nov 4 2:00
800 -5:00 US E%sT
801#
802# Starke County, Indiana moved from central to eastern time in 1991,
803# then switched back in 2006.
804# From Arthur David Olson (1991-10-28):
805# An article on page A3 of the Sunday, 1991-10-27 Washington Post
806# notes that Starke County switched from Central time to Eastern time as of
807# 1991-10-27.
808# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
809Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
810Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
811Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
812Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
813Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
814# Zone NAME GMTOFF RULES FORMAT [UNTIL]
815Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
816 -6:00 US C%sT 1947
817 -6:00 Starke C%sT 1962 Apr 29 2:00
818 -5:00 - EST 1963 Oct 27 2:00
819 -6:00 US C%sT 1991 Oct 27 2:00
820 -5:00 - EST 2006 Apr 2 2:00
821 -6:00 US C%sT
822#
823# Pulaski County, Indiana, switched from eastern to central time in
824# April 2006 and then switched back in March 2007.
825# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
826Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
827Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
828Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
829Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
830# Zone NAME GMTOFF RULES FORMAT [UNTIL]
831Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
832 -6:00 US C%sT 1946
833 -6:00 Pulaski C%sT 1961 Apr 30 2:00
834 -5:00 - EST 1969
835 -5:00 US E%sT 1971
836 -5:00 - EST 2006 Apr 2 2:00
837 -6:00 US C%sT 2007 Mar 11 2:00
838 -5:00 US E%sT
839#
840# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
841# Zone NAME GMTOFF RULES FORMAT [UNTIL]
842Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
843 -6:00 US C%sT 1954 Apr 25 2:00
844 -5:00 - EST 1969
845 -5:00 US E%sT 1973
846 -5:00 - EST 2006
847 -5:00 US E%sT
848
849# Part of Kentucky left its clocks alone in 1974.
850# This also includes Clark, Floyd, and Harrison counties in Indiana.
851# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
852Rule Louisville 1921 only - May 1 2:00 1:00 D
853Rule Louisville 1921 only - Sep 1 2:00 0 S
854Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
855Rule Louisville 1941 only - Sep lastSun 2:00 0 S
856Rule Louisville 1946 only - Jun 2 2:00 0 S
857Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
858Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
859# Zone NAME GMTOFF RULES FORMAT [UNTIL]
860Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
861 -6:00 US C%sT 1921
862 -6:00 Louisville C%sT 1942
863 -6:00 US C%sT 1946
864 -6:00 Louisville C%sT 1961 Jul 23 2:00
865 -5:00 - EST 1968
866 -5:00 US E%sT 1974 Jan 6 2:00
867 -6:00 1:00 CDT 1974 Oct 27 2:00
868 -5:00 US E%sT
869#
870# Wayne County, Kentucky
871#
872# From
873# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
874# Lake Cumberland LIFE
875# </a> (1999-01-29) via WKYM-101.7:
876# Clinton County has joined Wayne County in asking the DoT to change from
877# the Central to the Eastern time zone.... The Wayne County government made
878# the same request in December. And while Russell County officials have not
879# taken action, the majority of respondents to a poll conducted there in
880# August indicated they would like to change to "fast time" also.
881# The three Lake Cumberland counties are the farthest east of any U.S.
882# location in the Central time zone.
883#
884# From Rich Wales (2000-08-29):
885# After prolonged debate, and despite continuing deep differences of opinion,
886# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
887# (-0500) time. They won't "fall back" this year. See Sara Shipley,
888# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
889#
890# From Paul Eggert (2001-07-16):
891# The final rule was published in the
892# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
893# Federal Register 65, 160 (2000-08-17), page 50154-50158.
894# </a>
895#
896Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
897 -6:00 US C%sT 1946
898 -6:00 - CST 1968
899 -6:00 US C%sT 2000 Oct 29 2:00
900 -5:00 US E%sT
901
902
903# From Rives McDow (2000-08-30):
904# Here ... are all the changes in the US since 1985.
905# Kearny County, KS (put all of county on central;
906# previously split between MST and CST) ... 1990-10
907# Starke County, IN (from CST to EST) ... 1991-10
908# Oliver County, ND (from MST to CST) ... 1992-10
909# West Wendover, NV (from PST TO MST) ... 1999-10
910# Wayne County, KY (from CST to EST) ... 2000-10
911#
912# From Paul Eggert (2001-07-17):
913# We don't know where the line used to be within Kearny County, KS,
914# so omit that change for now.
915# See America/Indiana/Knox for the Starke County, IN change.
916# See America/North_Dakota/Center for the Oliver County, ND change.
917# West Wendover, NV officially switched from Pacific to mountain time on
918# 1999-10-31. See the
919# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
920# Federal Register 64, 203 (1999-10-21), page 56705-56707.
921# </a>
922# However, the Federal Register says that West Wendover already operated
923# on mountain time, and the rule merely made this official;
924# hence a separate tz entry is not needed.
925
926# Michigan
927#
928# From Bob Devine (1988-01-28):
929# Michigan didn't observe DST from 1968 to 1973.
930#
931# From Paul Eggert (1999-03-31):
932# Shanks writes that Michigan started using standard time on 1885-09-18,
933# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
934# that Detroit kept
935#
936# local time until 1900 when the City Council decreed that clocks should
937# be put back twenty-eight minutes to Central Standard Time. Half the
938# city obeyed, half refused. After considerable debate, the decision
939# was rescinded and the city reverted to Sun time. A derisive offer to
940# erect a sundial in front of the city hall was referred to the
941# Committee on Sewers. Then, in 1905, Central time was adopted
942# by city vote.
943#
944# This story is too entertaining to be false, so go with Howse over Shanks.
945#
946# From Paul Eggert (2001-03-06):
947# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
948# one hour in 1914.'' This change is not in Shanks. We have no more
949# info, so omit this for now.
950#
951# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
952# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
953Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
954Rule Detroit 1948 only - Sep lastSun 2:00 0 S
955Rule Detroit 1967 only - Jun 14 2:00 1:00 D
956Rule Detroit 1967 only - Oct lastSun 2:00 0 S
957# Zone NAME GMTOFF RULES FORMAT [UNTIL]
958Zone America/Detroit -5:32:11 - LMT 1905
959 -6:00 - CST 1915 May 15 2:00
960 -5:00 - EST 1942
961 -5:00 US E%sT 1946
962 -5:00 Detroit E%sT 1973
963 -5:00 US E%sT 1975
964 -5:00 - EST 1975 Apr 27 2:00
965 -5:00 US E%sT
966#
967# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
968# switched from EST to CST/CDT in 1973.
969# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
970Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
971Rule Menominee 1946 only - Sep lastSun 2:00 0 S
972Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
973Rule Menominee 1966 only - Oct lastSun 2:00 0 S
974# Zone NAME GMTOFF RULES FORMAT [UNTIL]
975Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
976 -6:00 US C%sT 1946
977 -6:00 Menominee C%sT 1969 Apr 27 2:00
978 -5:00 - EST 1973 Apr 29 2:00
979 -6:00 US C%sT
980
981# Navassa
982# administered by the US Fish and Wildlife Service
983# claimed by US under the provisions of the 1856 Guano Islands Act
984# also claimed by Haiti
985# occupied 1857/1900 by the Navassa Phosphate Co
986# US lighthouse 1917/1996-09
987# currently uninhabited
988# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
989# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
990# Jimmy Skaggs, _The Great Guano Rush_ (1994).
991
992################################################################################
993
994
995# From Paul Eggert (2006-03-22):
996# A good source for time zone historical data outside the U.S. is
997# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
998# San Diego: ACS Publications, Inc. (2003).
999#
1000# Gwillim Law writes that a good source
1001# for recent time zone data is the International Air Transport
1002# Association's Standard Schedules Information Manual (IATA SSIM),
1003# published semiannually. Law sent in several helpful summaries
1004# of the IATA's data after 1990.
1005#
1006# Except where otherwise noted, Shanks & Pottenger is the source for
1007# entries through 1990, and IATA SSIM is the source for entries afterwards.
1008#
1009# Other sources occasionally used include:
1010#
1011# Edward W. Whitman, World Time Differences,
1012# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1013# which I found in the UCLA library.
1014#
1015# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1016# William Willett, The Waste of Daylight, 19th edition
1017# </a> (1914-03)
1018#
1019# See the `europe' file for Greenland.
1020
1021# Canada
1022
1023# From Alain LaBont<e'> (1994-11-14):
1024# I post here the time zone abbreviations standardized in Canada
1025# for both English and French in the CAN/CSA-Z234.4-89 standard....
1026#
1027# UTC Standard time Daylight savings time
1028# offset French English French English
1029# -2:30 - - HAT NDT
1030# -3 - - HAA ADT
1031# -3:30 HNT NST - -
1032# -4 HNA AST HAE EDT
1033# -5 HNE EST HAC CDT
1034# -6 HNC CST HAR MDT
1035# -7 HNR MST HAP PDT
1036# -8 HNP PST HAY YDT
1037# -9 HNY YST - -
1038#
1039# HN: Heure Normale ST: Standard Time
1040# HA: Heure Avanc<e'>e DT: Daylight saving Time
1041#
1042# A: de l'Atlantique Atlantic
1043# C: du Centre Central
1044# E: de l'Est Eastern
1045# M: Mountain
1046# N: Newfoundland
1047# P: du Pacifique Pacific
1048# R: des Rocheuses
1049# T: de Terre-Neuve
1050# Y: du Yukon Yukon
1051#
1052# From Paul Eggert (1994-11-22):
1053# Alas, this sort of thing must be handled by localization software.
1054
1055# Unless otherwise specified, the data for Canada are all from Shanks
1056# & Pottenger.
1057
1058# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1059# 2007-03-01):
1060# The British Columbia government announced yesterday that it will
1061# adjust daylight savings next year to align with changes in the
1062# U.S. and the rest of Canada....
1063# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1064# ...
1065# Nova Scotia
1066# Daylight saving time will be extended by four weeks starting in 2007....
1067# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1068#
1069# [For New Brunswick] the new legislation dictates that the time change is to
1070# be done at 02:00 instead of 00:01.
1071# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1072# ...
1073# Manitoba has traditionally changed the clock every fall at 03:00.
1074# As of 2006, the transition is to take place one hour earlier at 02:00.
1075# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1076# ...
1077# [Alberta, Ontario, Quebec] will follow US rules.
1078# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1079# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1080# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1081# ...
1082# P.E.I. will follow US rules....
1083# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1084# ...
1085# Province of Newfoundland and Labrador....
1086# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1087# ...
1088# Yukon
1089# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1090# ...
1091# N.W.T. will follow US rules. Whoever maintains the government web site
1092# does not seem to believe in bookmarks. To see the news release, click the
1093# following link and search for "Daylight Savings Time Change". Press the
1094# "Daylight Savings Time Change" link; it will fire off a popup using
1095# JavaScript.
1096# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1097# ...
1098# Nunavut
1099# An amendment to the Interpretation Act was registered on February 19/2007....
1100# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1101
1102# From Paul Eggert (2006-04-25):
1103# H. David Matthews and Mary Vincent's map
1104# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1105# "It's about TIME", _Canadian Geographic_ (September-October 1998)
1106# </a> contains detailed boundaries for regions observing nonstandard
1107# time and daylight saving time arrangements in Canada circa 1998.
1108#
1109# INMS, the Institute for National Measurement Standards in Ottawa, has <a
1110# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1111# information about standard and daylight saving time zones in Canada.
1112# </a> (updated periodically).
1113# Its unofficial information is often taken from Matthews and Vincent.
1114
1115# From Paul Eggert (2006-06-27):
1116# For now, assume all of DST-observing Canada will fall into line with the
1117# new US DST rules,
1118
1119# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1120Rule Canada 1918 only - Apr 14 2:00 1:00 D
1121Rule Canada 1918 only - Oct 31 2:00 0 S
1122Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1123Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1124Rule Canada 1945 only - Sep 30 2:00 0 S
1125Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1126Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1127Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1128Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1129Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1130
1131
1132# Newfoundland and Labrador
1133
1134# From Paul Eggert (2000-10-02):
1135# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1136# but the only part of Labrador that follows the rules is the
1137# southeast corner, including Port Hope Simpson and Mary's Harbour,
1138# but excluding, say, Black Tickle.
1139
1140# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1141Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1142Rule StJohns 1917 only - Sep 17 2:00 0 S
1143# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1144Rule StJohns 1919 only - May 5 23:00 1:00 D
1145Rule StJohns 1919 only - Aug 12 23:00 0 S
1146# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1147Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1148Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1149# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1150# Pottenger.
1151Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1152Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1153# Whitman gives the following transitions:
1154# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1155# but go with Shanks & Pottenger and assume they used Canadian rules.
1156# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1157# Apr 30 - Sep 24; go with Shanks & Pottenger.
1158Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1159Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1160Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1161Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1162Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1163# From Paul Eggert (2000-10-02):
1164# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1165# at 00:01 local time. For now, assume it started in 1987.
1166Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1167Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1168Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1169Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1170Rule StJohns 2007 max - Mar Sun>=8 0:01 1:00 D
1171Rule StJohns 2007 max - Nov Sun>=1 0:01 0 S
1172#
1173# St John's has an apostrophe, but Posix file names can't have apostrophes.
1174# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1175Zone America/St_Johns -3:30:52 - LMT 1884
1176 -3:30:52 StJohns N%sT 1918
1177 -3:30:52 Canada N%sT 1919
1178 -3:30:52 StJohns N%sT 1935 Mar 30
1179 -3:30 StJohns N%sT 1942 May 11
1180 -3:30 Canada N%sT 1946
1181 -3:30 StJohns N%sT
1182
1183# most of east Labrador
1184
1185# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1186# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1187Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1188 -3:30:52 - NST 1918
1189 -3:30:52 Canada N%sT 1919
1190 -3:30:52 - NST 1935 Mar 30
1191 -3:30 - NST 1936
1192 -3:30 StJohns N%sT 1942 May 11
1193 -3:30 Canada N%sT 1946
1194 -3:30 StJohns N%sT 1966 Mar 15 2:00
1195 -4:00 StJohns A%sT
1196
1197
1198# west Labrador, Nova Scotia, Prince Edward I
1199
1200# From Paul Eggert (2006-03-22):
1201# Shanks & Pottenger write that since 1970 most of this region has been like
1202# Halifax. Many locales did not observe peacetime DST until 1972;
1203# Glace Bay, NS is the largest that we know of.
1204# Shanks & Pottenger also write that Liverpool, NS was the only town
1205# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1206# this is a typo.
1207
1208# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1209Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1210Rule Halifax 1916 only - Oct 1 0:00 0 S
1211Rule Halifax 1920 only - May 9 0:00 1:00 D
1212Rule Halifax 1920 only - Aug 29 0:00 0 S
1213Rule Halifax 1921 only - May 6 0:00 1:00 D
1214Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1215Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1216Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1217Rule Halifax 1923 only - Sep 4 0:00 0 S
1218Rule Halifax 1924 only - Sep 15 0:00 0 S
1219Rule Halifax 1925 only - Sep 28 0:00 0 S
1220Rule Halifax 1926 only - May 16 0:00 1:00 D
1221Rule Halifax 1926 only - Sep 13 0:00 0 S
1222Rule Halifax 1927 only - May 1 0:00 1:00 D
1223Rule Halifax 1927 only - Sep 26 0:00 0 S
1224Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1225Rule Halifax 1928 only - Sep 9 0:00 0 S
1226Rule Halifax 1929 only - Sep 3 0:00 0 S
1227Rule Halifax 1930 only - Sep 15 0:00 0 S
1228Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1229Rule Halifax 1932 only - May 1 0:00 1:00 D
1230Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1231Rule Halifax 1933 only - Oct 2 0:00 0 S
1232Rule Halifax 1934 only - May 20 0:00 1:00 D
1233Rule Halifax 1934 only - Sep 16 0:00 0 S
1234Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1235Rule Halifax 1935 only - Sep 30 0:00 0 S
1236Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1237Rule Halifax 1936 only - Sep 14 0:00 0 S
1238Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1239Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1240Rule Halifax 1939 only - May 28 0:00 1:00 D
1241Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1242Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1243Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1244Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1245Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1246Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1247Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1248Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1249Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1250# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1251Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1252 -4:00 Halifax A%sT 1918
1253 -4:00 Canada A%sT 1919
1254 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1255 -4:00 Canada A%sT 1946
1256 -4:00 Halifax A%sT 1974
1257 -4:00 Canada A%sT
1258Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1259 -4:00 Canada A%sT 1953
1260 -4:00 Halifax A%sT 1954
1261 -4:00 - AST 1972
1262 -4:00 Halifax A%sT 1974
1263 -4:00 Canada A%sT
1264
1265# New Brunswick
1266
1267# From Paul Eggert (2007-01-31):
1268# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1269# says they changed at 00:01 through 2006, and
1270# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1271# clear that this was the case since at least 1993.
1272# For now, assume it started in 1993.
1273
1274# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1275Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1276Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1277Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1278Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1279Rule Moncton 1939 only - May 27 1:00 1:00 D
1280Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1281Rule Moncton 1940 only - May 19 1:00 1:00 D
1282Rule Moncton 1941 only - May 4 1:00 1:00 D
1283Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1284Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1285Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1286Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1287Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1288# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1289Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1290 -5:00 - EST 1902 Jun 15
1291 -4:00 Canada A%sT 1933
1292 -4:00 Moncton A%sT 1942
1293 -4:00 Canada A%sT 1946
1294 -4:00 Moncton A%sT 1973
1295 -4:00 Canada A%sT 1993
1296 -4:00 Moncton A%sT 2007
1297 -4:00 Canada A%sT
1298
1299# Quebec
1300
1301# From Paul Eggert (2006-07-09):
1302# Shanks & Pottenger write that since 1970 most of Quebec has been
1303# like Montreal.
1304
1305# From Paul Eggert (2006-06-27):
1306# Matthews and Vincent (1998) also write that Quebec east of the -63
1307# meridian is supposed to observe AST, but residents as far east as
1308# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1309# In "Official time in Quebec" the Quebec department of justice writes in
1310# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1311# that "The residents of the Municipality of the
1312# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1313# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1314# written and use Atlantic standard time all year round. The same applies to
1315# the residents of the Native facilities along the lower North Shore."
1316# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1317# says this common practice was codified into law as of 2007.
1318# For lack of better info, guess this practice began around 1970, contra to
1319# Shanks & Pottenger who have this region observing AST/ADT.
1320
1321# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1322Rule Mont 1917 only - Mar 25 2:00 1:00 D
1323Rule Mont 1917 only - Apr 24 0:00 0 S
1324Rule Mont 1919 only - Mar 31 2:30 1:00 D
1325Rule Mont 1919 only - Oct 25 2:30 0 S
1326Rule Mont 1920 only - May 2 2:30 1:00 D
1327Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1328Rule Mont 1921 only - May 1 2:00 1:00 D
1329Rule Mont 1922 only - Apr 30 2:00 1:00 D
1330Rule Mont 1924 only - May 17 2:00 1:00 D
1331Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1332Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1333# The 1927-to-1937 rules can be expressed more simply as
1334# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1335# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1336# The rules below avoid use of 24:00
1337# (which pre-1998 versions of zic cannot handle).
1338Rule Mont 1927 only - May 1 0:00 1:00 D
1339Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1340Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1341Rule Mont 1932 only - May 1 0:00 1:00 D
1342Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1343Rule Mont 1933 only - Oct 1 0:00 0 S
1344Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1345Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1346Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1347Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1348Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1349Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1350
1351# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1352Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1353 -4:00 Canada A%sT 1970
1354 -4:00 - AST
1355Zone America/Montreal -4:54:16 - LMT 1884
1356 -5:00 Mont E%sT 1918
1357 -5:00 Canada E%sT 1919
1358 -5:00 Mont E%sT 1942 Feb 9 2:00s
1359 -5:00 Canada E%sT 1946
1360 -5:00 Mont E%sT 1974
1361 -5:00 Canada E%sT
1362
1363
1364# Ontario
1365
1366# From Paul Eggert (2006-07-09):
1367# Shanks & Pottenger write that since 1970 most of Ontario has been like
1368# Toronto.
1369# Thunder Bay skipped DST in 1973.
1370# Many smaller locales did not observe peacetime DST until 1974;
1371# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1372# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1373
1374# From Mark Brader (2003-07-26):
1375# [According to the Toronto Star] Orillia, Ontario, adopted DST
1376# effective Saturday, 1912-06-22, 22:00; the article mentions that
1377# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1378# have already done so. In Orillia DST was to run until Saturday,
1379# 1912-08-31 (no time mentioned), but it was met with considerable
1380# hostility from certain segments of the public, and was revoked after
1381# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1382# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1383# earlier in June).
1384#
1385# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1386
1387# From Paul Eggert (1997-10-17):
1388# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1389# says that Atikokan, Ontario currently does not observe DST,
1390# but will vote on 11-10 whether to use EST/EDT.
1391# He also writes that the
1392# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1393# Ontario Time Act (1990, Chapter T.9)
1394# </a>
1395# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1396# Officially Atikokan is therefore on CST/CDT, and most likely this report
1397# concerns a non-official time observed as a matter of local practice.
1398#
1399# From Paul Eggert (2000-10-02):
1400# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1401# New Osnaburgh observe CST all year, that Big Trout Lake observes
1402# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1403# violation of the official Ontario rules.
1404#
1405# From Paul Eggert (2006-07-09):
1406# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1407# 2005-07-21 Chronicle-Journal, which said:
1408#
1409# The clocks in Atikokan stay set on standard time year-round.
1410# This means they spend about half the time on central time and
1411# the other half on eastern time.
1412#
1413# For the most part, the system works, Mayor Dennis Brown said.
1414#
1415# "The majority of businesses in Atikokan deal more with Eastern
1416# Canada, but there are some that deal with Western Canada," he
1417# said. "I don't see any changes happening here."
1418#
1419# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1420# [New Osnaburgh] follow the same practice."
1421
1422# From Garry McKinnon (2006-07-14) via Chris Walton:
1423# I chatted with a member of my board who has an outstanding memory
1424# and a long history in Atikokan (and in the telecom industry) and he
1425# can say for certain that Atikokan has been practicing the current
1426# time keeping since 1952, at least.
1427
1428# From Paul Eggert (2006-07-17):
1429# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1430# ever since standard time was introduced, but the information from
1431# McKinnon sounds more authoritative. For now, assume that Atikokan
1432# switched to EST immediately after WWII era daylight saving time
1433# ended. This matches the old (less-populous) America/Coral_Harbour
1434# entry since our cutoff date of 1970, so we can move
1435# America/Coral_Harbour to the 'backward' file.
1436
1437# From Mark Brader (2010-03-06):
1438#
1439# Currently the database has:
1440#
1441# # Ontario
1442#
1443# # From Paul Eggert (2006-07-09):
1444# # Shanks & Pottenger write that since 1970 most of Ontario has been like
1445# # Toronto.
1446# # Thunder Bay skipped DST in 1973.
1447# # Many smaller locales did not observe peacetime DST until 1974;
1448# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1449#
1450# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1451# right corner of page 1, it says that Toronto will return to standard
1452# time at 2 am Sunday morning (which agrees with the database), and that:
1453#
1454# The one-hour setback will go into effect throughout most of Ontario,
1455# except in areas like Windsor which remains on standard time all year.
1456#
1457# Windsor is, of course, a lot larger than Nipigon.
1458#
1459# I only came across this incidentally. I don't know if Windsor began
1460# observing DST when Detroit did, or in 1974, or on some other date.
1461#
1462# By the way, the article continues by noting that:
1463#
1464# Some cities in the United States have pushed the deadline back
1465# three weeks and will change over from daylight saving in October.
1466
1467# From Arthur David Olson (2010-07-17):
1468#
1469# "Standard Time and Time Zones in Canada" appeared in
1470# The Journal of The Royal Astronomical Society of Canada,
1471# volume 26, number 2 (February 1932) and, as of 2010-07-17,
1472# was available at
1473# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1474# http://adsabs.harvard.edu/full/1932JRASC..26...49S
1475# </a>
1476#
1477# It includes the text below (starting on page 57):
1478#
1479# A list of the places in Canada using daylight saving time would
1480# require yearly revision. From information kindly furnished by
1481# the provincial governments and by the postmasters in many cities
1482# and towns, it is found that the following places used daylight sav-
1483# ing in 1930. The information for the province of Quebec is definite,
1484# for the other provinces only approximate:
1485#
1486# Province Daylight saving time used
1487# Prince Edward Island Not used.
1488# Nova Scotia In Halifax only.
1489# New Brunswick In St. John only.
1490# Quebec In the following places:
1491# Montreal Lachine
1492# Quebec Mont-Royal
1493# Levis Iberville
1494# St. Lambert Cap de la Madeleine
1495# Verdun Loretteville
1496# Westmount Richmond
1497# Outremont St. Jerome
1498# Longueuil Greenfield Park
1499# Arvida Waterloo
1500# Chambly-Canton Beaulieu
1501# Melbourne La Tuque
1502# St. Theophile Buckingham
1503# Ontario Used generally in the cities and towns along
1504# the southerly part of the province. Not
1505# used in the northwesterlhy part.
1506# Manitoba Not used.
1507# Saskatchewan In Regina only.
1508# Alberta Not used.
1509# British Columbia Not used.
1510#
1511# With some exceptions, the use of daylight saving may be said to be limited
1512# to those cities and towns lying between Quebec city and Windsor, Ont.
1513
1514# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1515Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1516Rule Toronto 1919 only - Oct 26 0:00 0 S
1517Rule Toronto 1920 only - May 2 2:00 1:00 D
1518Rule Toronto 1920 only - Sep 26 0:00 0 S
1519Rule Toronto 1921 only - May 15 2:00 1:00 D
1520Rule Toronto 1921 only - Sep 15 2:00 0 S
1521Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1522# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1523# was meant.
1524Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1525Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1526# The 1927-to-1939 rules can be expressed more simply as
1527# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1528# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1529# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1530# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1531# The rules below avoid use of Sun>=25
1532# (which pre-2004 versions of zic cannot handle).
1533Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1534Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1535Rule Toronto 1932 only - May 1 2:00 1:00 D
1536Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1537Rule Toronto 1933 only - Oct 1 2:00 0 S
1538Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1539Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1540Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1541Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1542Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1543Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1544Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1545Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1546Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1547# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1548# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1549# is wrong, and that he had confirmed it by checking the 1971-10-30
1550# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1551Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1552
1553# From Paul Eggert (2003-07-27):
1554# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1555# Port Arthur, Ontario, the principle of the Bill has been in
1556# operation for the past three years, and in the City of Moose Jaw,
1557# Saskatchewan, for one year."
1558
1559# From David Bryan via Tory Tronrud, Director/Curator,
1560# Thunder Bay Museum (2003-11-12):
1561# There is some suggestion, however, that, by-law or not, daylight
1562# savings time was being practiced in Fort William and Port Arthur
1563# before 1909.... [I]n 1910, the line between the Eastern and Central
1564# Time Zones was permanently moved about two hundred miles west to
1565# include the Thunder Bay area.... When Canada adopted daylight
1566# savings time in 1916, Fort William and Port Arthur, having done so
1567# already, did not change their clocks.... During the Second World
1568# War,... [t]he cities agreed to implement DST during the summer
1569# months for the remainder of the war years.
1570
1571# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1572Zone America/Toronto -5:17:32 - LMT 1895
1573 -5:00 Canada E%sT 1919
1574 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1575 -5:00 Canada E%sT 1946
1576 -5:00 Toronto E%sT 1974
1577 -5:00 Canada E%sT
1578Zone America/Thunder_Bay -5:57:00 - LMT 1895
1579 -6:00 - CST 1910
1580 -5:00 - EST 1942
1581 -5:00 Canada E%sT 1970
1582 -5:00 Mont E%sT 1973
1583 -5:00 - EST 1974
1584 -5:00 Canada E%sT
1585Zone America/Nipigon -5:53:04 - LMT 1895
1586 -5:00 Canada E%sT 1940 Sep 29
1587 -5:00 1:00 EDT 1942 Feb 9 2:00s
1588 -5:00 Canada E%sT
1589Zone America/Rainy_River -6:18:16 - LMT 1895
1590 -6:00 Canada C%sT 1940 Sep 29
1591 -6:00 1:00 CDT 1942 Feb 9 2:00s
1592 -6:00 Canada C%sT
1593Zone America/Atikokan -6:06:28 - LMT 1895
1594 -6:00 Canada C%sT 1940 Sep 29
1595 -6:00 1:00 CDT 1942 Feb 9 2:00s
1596 -6:00 Canada C%sT 1945 Sep 30 2:00
1597 -5:00 - EST
1598
1599
1600# Manitoba
1601
1602# From Rob Douglas (2006-04-06):
1603# the old Manitoba Time Act - as amended by Bill 2, assented to
1604# March 27, 1987 ... said ...
1605# "between two o'clock Central Standard Time in the morning of
1606# the first Sunday of April of each year and two o'clock Central
1607# Standard Time in the morning of the last Sunday of October next
1608# following, one hour in advance of Central Standard Time."...
1609# I believe that the English legislation [of the old time act] had =
1610# been assented to (March 22, 1967)....
1611# Also, as far as I can tell, there was no order-in-council varying
1612# the time of Daylight Saving Time for 2005 and so the provisions of
1613# the 1987 version would apply - the changeover was at 2:00 Central
1614# Standard Time (i.e. not until 3:00 Central Daylight Time).
1615
1616# From Paul Eggert (2006-04-10):
1617# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1618# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1619# it was also 02:00s in 1966.
1620
1621# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1622Rule Winn 1916 only - Apr 23 0:00 1:00 D
1623Rule Winn 1916 only - Sep 17 0:00 0 S
1624Rule Winn 1918 only - Apr 14 2:00 1:00 D
1625Rule Winn 1918 only - Oct 31 2:00 0 S
1626Rule Winn 1937 only - May 16 2:00 1:00 D
1627Rule Winn 1937 only - Sep 26 2:00 0 S
1628Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1629Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1630Rule Winn 1945 only - Sep lastSun 2:00 0 S
1631Rule Winn 1946 only - May 12 2:00 1:00 D
1632Rule Winn 1946 only - Oct 13 2:00 0 S
1633Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1634Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1635Rule Winn 1950 only - May 1 2:00 1:00 D
1636Rule Winn 1950 only - Sep 30 2:00 0 S
1637Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1638Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1639Rule Winn 1959 only - Oct lastSun 2:00 0 S
1640Rule Winn 1960 only - Sep lastSun 2:00 0 S
1641Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1642Rule Winn 1963 only - Sep 22 2:00 0 S
1643Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1644Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1645Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1646# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1647Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1648 -6:00 Winn C%sT 2006
1649 -6:00 Canada C%sT
1650
1651
1652# Saskatchewan
1653
1654# From Mark Brader (2003-07-26):
1655# The first actual adoption of DST in Canada was at the municipal
1656# level. As the [Toronto] Star put it (1912-06-07), "While people
1657# elsewhere have long been talking of legislation to save daylight,
1658# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1659# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1660# presumably late evening, as below), and would run until "the end of
1661# the summer". The discrepancy between municipal time and railroad
1662# time was noted.
1663
1664# From Paul Eggert (2003-07-27):
1665# Willett (1914-03) notes that DST "has been in operation ... in the
1666# City of Moose Jaw, Saskatchewan, for one year."
1667
1668# From Paul Eggert (2006-03-22):
1669# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1670# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1671# Other western towns (e.g. Lloydminster) are like Edmonton.
1672# Matthews and Vincent (1998) write that Denare Beach and Creighton
1673# are like Winnipeg, in violation of Saskatchewan law.
1674
1675# From W. Jones (1992-11-06):
1676# The. . .below is based on information I got from our law library, the
1677# provincial archives, and the provincial Community Services department.
1678# A precise history would require digging through newspaper archives, and
1679# since you didn't say what you wanted, I didn't bother.
1680#
1681# Saskatchewan is split by a time zone meridian (105W) and over the years
1682# the boundary became pretty ragged as communities near it reevaluated
1683# their affiliations in one direction or the other. In 1965 a provincial
1684# referendum favoured legislating common time practices.
1685#
1686# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1687# Saskatchewan 1978) was proclaimed, and established that the eastern
1688# part of Saskatchewan would use CST year round, that districts in
1689# northwest Saskatchewan would by default follow CST but could opt to
1690# follow Mountain Time rules (thus 1 hour difference in the winter and
1691# zero in the summer), and that districts in southwest Saskatchewan would
1692# by default follow MT but could opt to follow CST.
1693#
1694# It took a few years for the dust to settle (I know one story of a town
1695# on one time zone having its school in another, such that a mom had to
1696# serve her family lunch in two shifts), but presently it seems that only
1697# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1698# rules any more; all other districts appear to have used CST year round
1699# since sometime in the 1960s.
1700
1701# From Chris Walton (2006-06-26):
1702# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1703# long and rather painful to read.
1704# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1705
1706# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1707Rule Regina 1918 only - Apr 14 2:00 1:00 D
1708Rule Regina 1918 only - Oct 31 2:00 0 S
1709Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1710Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1711Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1712Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1713Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1714Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1715Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1716Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1717Rule Regina 1945 only - Sep lastSun 2:00 0 S
1718Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1719Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1720Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1721Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1722Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1723Rule Regina 1959 only - Oct lastSun 2:00 0 S
1724#
1725Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1726Rule Swift 1957 only - Oct lastSun 2:00 0 S
1727Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1728Rule Swift 1959 only - Oct lastSun 2:00 0 S
1729Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1730# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1731Zone America/Regina -6:58:36 - LMT 1905 Sep
1732 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1733 -6:00 - CST
1734Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1735 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1736 -7:00 Regina M%sT 1950
1737 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1738 -6:00 - CST
1739
1740
1741# Alberta
1742
1743# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1744Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1745Rule Edm 1918 only - Oct 31 2:00 0 S
1746Rule Edm 1919 only - May 27 2:00 0 S
1747Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1748Rule Edm 1920 only - Oct lastSun 2:00 0 S
1749Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1750Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1751Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1752Rule Edm 1945 only - Sep lastSun 2:00 0 S
1753Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1754Rule Edm 1947 only - Sep lastSun 2:00 0 S
1755Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1756Rule Edm 1967 only - Oct lastSun 2:00 0 S
1757Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1758Rule Edm 1969 only - Oct lastSun 2:00 0 S
1759Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1760Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1762Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1763 -7:00 Edm M%sT 1987
1764 -7:00 Canada M%sT
1765
1766
1767# British Columbia
1768
1769# From Paul Eggert (2006-03-22):
1770# Shanks & Pottenger write that since 1970 most of this region has
1771# been like Vancouver.
1772# Dawson Creek uses MST. Much of east BC is like Edmonton.
1773# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1774
1775# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1776Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1777Rule Vanc 1918 only - Oct 31 2:00 0 S
1778Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1779Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1780Rule Vanc 1945 only - Sep 30 2:00 0 S
1781Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1782Rule Vanc 1946 only - Oct 13 2:00 0 S
1783Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1784Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1785# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1786Zone America/Vancouver -8:12:28 - LMT 1884
1787 -8:00 Vanc P%sT 1987
1788 -8:00 Canada P%sT
1789Zone America/Dawson_Creek -8:00:56 - LMT 1884
1790 -8:00 Canada P%sT 1947
1791 -8:00 Vanc P%sT 1972 Aug 30 2:00
1792 -7:00 - MST
1793
1794
1795# Northwest Territories, Nunavut, Yukon
1796
1797# From Paul Eggert (2006-03-22):
1798# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1799# Mathew Englander (1996-10-07) gives the following refs:
1800# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1801# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1802# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1803# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1804# * O.I.C. 1980/02 established DST.
1805# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1806# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1807# with Englander.
1808# From Chris Walton (2006-06-26):
1809# Here is a link to the old daylight saving portion of the interpretation
1810# act which was last updated in 1987:
1811# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1812
1813# From Rives McDow (1999-09-04):
1814# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1815# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1816# Nunavut moves to single time zone Oct. 31
1817# </a>
1818#
1819# From Antoine Leca (1999-09-06):
1820# We then need to create a new timezone for the Kitikmeot region of Nunavut
1821# to differentiate it from the Yellowknife region.
1822
1823# From Paul Eggert (1999-09-20):
1824# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1825# Basic Facts: The New Territory
1826# </a> (1999) reports that Pangnirtung operates on eastern time,
1827# and that Coral Harbour does not observe DST. We don't know when
1828# Pangnirtung switched to eastern time; we'll guess 1995.
1829
1830# From Rives McDow (1999-11-08):
1831# On October 31, when the rest of Nunavut went to Central time,
1832# Pangnirtung wobbled. Here is the result of their wobble:
1833#
1834# The following businesses and organizations in Pangnirtung use Central Time:
1835#
1836# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1837# Eastern Arctic National Parks, A & D Specialist
1838#
1839# The following businesses and organizations in Pangnirtung use Eastern Time:
1840#
1841# Hamlet office, All other businesses, Both schools, Airport operator
1842#
1843# This has made for an interesting situation there, which warranted the news.
1844# No one there that I spoke with seems concerned, or has plans to
1845# change the local methods of keeping time, as it evidently does not
1846# really interfere with any activities or make things difficult locally.
1847# They plan to celebrate New Year's turn-over twice, one hour apart,
1848# so it appears that the situation will last at least that long.
1849# The Nunavut Intergovernmental Affairs hopes that they will "come to
1850# their senses", but the locals evidently don't see any problem with
1851# the current state of affairs.
1852
1853# From Michaela Rodrigue, writing in the
1854# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1855# Nunatsiaq News (1999-11-19)</a>:
1856# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1857# central - or Nunavut time - for government offices, and eastern time
1858# for municipal offices and schools.... Igloolik [was similar but then]
1859# made the switch to central time on Saturday, Nov. 6.
1860
1861# From Paul Eggert (2000-10-02):
1862# Matthews and Vincent (1998) say the following, but we lack histories
1863# for these potential new Zones.
1864#
1865# The Canadian Forces station at Alert uses Eastern Time while the
1866# handful of residents at the Eureka weather station [in the Central
1867# zone] skip daylight savings. Baffin Island, which is crossed by the
1868# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1869# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1870# Central Time and Southampton Island [in the Central zone] is not
1871# required to use daylight savings.
1872
1873# From
1874# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1875# Nunavut now has two time zones
1876# </a> (2000-11-10):
1877# The Nunavut government would allow its employees in Kugluktuk and
1878# Cambridge Bay to operate on central time year-round, putting them
1879# one hour behind the rest of Nunavut for six months during the winter.
1880# At the end of October the two communities had rebelled against
1881# Nunavut's unified time zone, refusing to shift to eastern time with
1882# the rest of the territory for the winter. Cambridge Bay remained on
1883# central time, while Kugluktuk, even farther west, reverted to
1884# mountain time, which they had used before the advent of Nunavut's
1885# unified time zone in 1999.
1886#
1887# From Rives McDow (2001-01-20), quoting the Nunavut government:
1888# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1889
1890# From Paul Eggert (2000-12-04):
1891# Let's just keep track of the official times for now.
1892
1893# From Rives McDow (2001-03-07):
1894# The premier of Nunavut has issued a ministerial statement advising
1895# that effective 2001-04-01, the territory of Nunavut will revert
1896# back to three time zones (mountain, central, and eastern). Of the
1897# cities in Nunavut, Coral Harbor is the only one that I know of that
1898# has said it will not observe dst, staying on EST year round. I'm
1899# checking for more info, and will get back to you if I come up with
1900# more.
1901# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1902
1903# From Gwillim Law (2005-05-21):
1904# According to maps at
1905# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
1906# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
1907# (both dated 2003), and
1908# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
1909# (from a 1998 Canadian Geographic article), the de facto and de jure time
1910# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
1911# round. Using Google, it's easy to find other websites that confirm this.
1912# I wasn't able to find how far back this time regimen goes, but since it
1913# predates the creation of Nunavut, it probably goes back many years....
1914# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
1915#
1916# From Paul Eggert (2005-07-26):
1917# For lack of better information, assume that Southampton Island observed
1918# daylight saving only during wartime.
1919
1920# From Chris Walton (2007-03-01):
1921# ... the community of Resolute (located on Cornwallis Island in
1922# Nunavut) moved from Central Time to Eastern Time last November.
1923# Basically the community did not change its clocks at the end of
1924# daylight saving....
1925# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
1926
1927# From Chris Walton (2007-03-14):
1928# Today I phoned the "hamlet office" to find out what Resolute was doing with
1929# its clocks.
1930#
1931# The individual that answered the phone confirmed that the clocks did not
1932# move at the end of daylight saving on October 29/2006. He also told me that
1933# the clocks did not move this past weekend (March 11/2007)....
1934
1935# From Chris Walton (2008-11-13):
1936# ...the residents of Resolute believe that they are changing "time zones"
1937# twice a year. In winter months, local time is qualified with "Eastern
1938# Time" which is really "Eastern Standard Time (UTC-5)". In summer
1939# months, local time is qualified with "Central Time" which is really
1940# "Central Daylight Time (UTC-5)"...
1941
1942# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1943Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1944Rule NT_YK 1918 only - Oct 27 2:00 0 S
1945Rule NT_YK 1919 only - May 25 2:00 1:00 D
1946Rule NT_YK 1919 only - Nov 1 0:00 0 S
1947Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1948Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1949Rule NT_YK 1945 only - Sep 30 2:00 0 S
1950Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1951Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1952Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1953Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
1954Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
1955# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1956# aka Panniqtuuq
1957Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
1958 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1959 -5:00 Canada E%sT 1999 Oct 31 2:00
1960 -6:00 Canada C%sT 2000 Oct 29 2:00
1961 -5:00 Canada E%sT
1962# formerly Frobisher Bay
1963Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
1964 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1965 -6:00 Canada C%sT 2000 Oct 29 2:00
1966 -5:00 Canada E%sT
1967# aka Qausuittuq
1968# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1969Rule Resolute 2006 max - Nov Sun>=1 2:00 0 ES
1970Rule Resolute 2007 max - Mar Sun>=8 2:00 0 CD
1971Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
1972 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1973 -5:00 - EST 2001 Apr 1 3:00
1974 -6:00 Canada C%sT 2006 Oct 29 2:00
1975 -5:00 Resolute %sT
1976# aka Kangiqiniq
1977Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
1978 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1979 -5:00 - EST 2001 Apr 1 3:00
1980 -6:00 Canada C%sT
1981# aka Iqaluktuuttiaq
1982Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
1983 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1984 -6:00 Canada C%sT 2000 Oct 29 2:00
1985 -5:00 - EST 2000 Nov 5 0:00
1986 -6:00 - CST 2001 Apr 1 3:00
1987 -7:00 Canada M%sT
1988Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
1989 -7:00 NT_YK M%sT 1980
1990 -7:00 Canada M%sT
1991Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
1992 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1993 -7:00 NT_YK M%sT 1980
1994 -7:00 Canada M%sT
1995Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1996 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1997 -8:00 NT_YK P%sT 1980
1998 -8:00 Canada P%sT
1999Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2000 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2001 -8:00 NT_YK P%sT 1980
2002 -8:00 Canada P%sT
2003
2004
2005###############################################################################
2006
2007# Mexico
2008
2009# From Paul Eggert (2001-03-05):
2010# The Investigation and Analysis Service of the
2011# Mexican Library of Congress (MLoC) has published a
2012# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2013# history of Mexican local time (in Spanish)
2014# </a>.
2015#
2016# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2017# (In all cases we go with the MLoC.)
2018# S&P report that Baja was at -8:00 in 1922/1923.
2019# S&P say the 1930 transition in Baja was 1930-11-16.
2020# S&P report no DST during summer 1931.
2021# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2022
2023# From Gwillim Law (2001-02-20):
2024# There are some other discrepancies between the Decrees page and the
2025# tz database. I think they can best be explained by supposing that
2026# the researchers who prepared the Decrees page failed to find some of
2027# the relevant documents.
2028
2029# From Alan Perry (1996-02-15):
2030# A guy from our Mexico subsidiary finally found the Presidential Decree
2031# outlining the timezone changes in Mexico.
2032#
2033# ------------- Begin Forwarded Message -------------
2034#
2035# I finally got my hands on the Official Presidential Decree that sets up the
2036# rules for the DST changes. The rules are:
2037#
2038# 1. The country is divided in 3 timezones:
2039# - Baja California Norte (the Mexico/BajaNorte TZ)
2040# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2041# - The rest of the country (the Mexico/General TZ)
2042#
2043# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2044# at 2:00 AM, the times in each zone are as follows:
2045# BajaNorte: GMT+7
2046# BajaSur: GMT+6
2047# General: GMT+5
2048#
2049# 3. The rest of the year, the times are as follows:
2050# BajaNorte: GMT+8
2051# BajaSur: GMT+7
2052# General: GMT+6
2053#
2054# The Decree was published in Mexico's Official Newspaper on January 4th.
2055#
2056# -------------- End Forwarded Message --------------
2057# From Paul Eggert (1996-06-12):
2058# For an English translation of the decree, see
2059# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2060# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
2061# </a>
2062
2063# From Rives McDow (1998-10-08):
2064# The State of Quintana Roo has reverted back to central STD and DST times
2065# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2066
2067# From Rives McDow (2000-01-10):
2068# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2069# zone 5 hours from the International Date Line, and will not observe daylight
2070# savings time so as to stay on the same time zone as the southern part of
2071# Arizona year round.
2072
2073# From Jesper Norgaard, translating
2074# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2075# In Oaxaca, the 55.000 teachers from the Section 22 of the National
2076# Syndicate of Education Workers, refuse to apply daylight saving each
2077# year, so that the more than 10,000 schools work at normal hour the
2078# whole year.
2079
2080# From Gwillim Law (2001-01-19):
2081# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2082# (translated):...
2083# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2084# that Summer Time will be reduced from seven to five months, starting
2085# this year....
2086# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2087# [translated], says "summer time will ... take effect on the first Sunday
2088# in May, and end on the last Sunday of September.
2089
2090# From Arthur David Olson (2001-01-25):
2091# The 2001-01-24 traditional Washington Post contained the page one
2092# story "Timely Issue Divides Mexicans."...
2093# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2094# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2095# Mexico City and its 20 million residents on a different time than
2096# the rest of the country..." In particular, Lopez Obrador would abolish
2097# observation of Daylight Saving Time.
2098
2099# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2100# Official statute published by the Energy Department
2101# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2102# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2103
2104# From Paul Eggert (2001-03-03):
2105#
2106# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2107# James F. Smith writes in today's LA Times
2108# </a>
2109# * Sonora will continue to observe standard time.
2110# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2111# the Federal District will not adopt DST.
2112# * 4 of 16 district leaders announced they'll ignore the decree.
2113# * The decree does not affect federal-controlled facilities including
2114# the airport, banks, hospitals, and schools.
2115#
2116# For now we'll assume that the Federal District will bow to federal rules.
2117
2118# From Jesper Norgaard (2001-04-01):
2119# I found some references to the Mexican application of daylight
2120# saving, which modifies what I had already sent you, stating earlier
2121# that a number of northern Mexican states would go on daylight
2122# saving. The modification reverts this to only cover Baja California
2123# (Norte), while all other states (except Sonora, who has no daylight
2124# saving all year) will follow the original decree of president
2125# Vicente Fox, starting daylight saving May 6, 2001 and ending
2126# September 30, 2001.
2127# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2128# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2129
2130# From Reuters (2001-09-04):
2131# Mexico's Supreme Court on Tuesday declared that daylight savings was
2132# unconstitutional in Mexico City, creating the possibility the
2133# capital will be in a different time zone from the rest of the nation
2134# next year.... The Supreme Court's ruling takes effect at 2:00
2135# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2136# standard time. "This is so residents of the Federal District are not
2137# subject to unexpected time changes," a statement from the court said.
2138
2139# From Jesper Norgaard Welen (2002-03-12):
2140# ... consulting my local grocery store(!) and my coworkers, they all insisted
2141# that a new decision had been made to reinstate US style DST in Mexico....
2142# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2143# confirms this. Sonora as usual is the only state where DST is not applied.
2144
2145# From Steffen Thorsen (2009-12-28):
2146#
2147# Steffen Thorsen wrote:
2148# > Mexico's House of Representatives has approved a proposal for northern
2149# > Mexico's border cities to share the same daylight saving schedule as
2150# > the United States.
2151# Now this has passed both the Congress and the Senate, so starting from
2152# 2010, some border regions will be the same:
2153# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2154# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2155# </a>
2156# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2157# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2158# </a>
2159# (Spanish)
2160#
2161# Could not find the new law text, but the proposed law text changes are here:
2162# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2163# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2164# </a>
2165# (Gaceta Parlamentaria)
2166#
2167# There is also a list of the votes here:
2168# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2169# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2170# </a>
2171#
2172# Our page:
2173# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2174# http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2175# </a>
2176
2177# From Arthur David Olson (2010-01-20):
2178# The page
2179# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2180# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2181# </a>
2182# includes this text:
2183# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2184# Ju&aacute;rez y Ojinaga en Chihuahua; Acu&ntilde;a y Piedras Negras en Coahuila;
2185# An&aacute;huac en Nuevo Le&oacute;n; y Nuevo Laredo, Reynosa y Matamoros en
2186# Tamaulipas, la aplicaci&oacute;n de este horario estacional surtir&aacute; efecto
2187# desde las dos horas del segundo domingo de marzo y concluir&aacute; a las dos
2188# horas del primer domingo de noviembre.
2189# En los municipios fronterizos que se encuentren ubicados en la franja
2190# fronteriza norte en el territorio comprendido entre la l&iacute;nea
2191# internacional y la l&iacute;nea paralela ubicada a una distancia de veinte
2192# kil&oacute;metros, as&iacute; como la Ciudad de Ensenada, Baja California, hacia el
2193# interior del pa&iacute;s, la aplicaci&oacute;n de este horario estacional surtir&aacute;
2194# efecto desde las dos horas del segundo domingo de marzo y concluir&aacute; a
2195# las dos horas del primer domingo de noviembre.
2196
2197# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2198Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2199Rule Mexico 1939 only - Jun 25 0:00 0 S
2200Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2201Rule Mexico 1941 only - Apr 1 0:00 0 S
2202Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2203Rule Mexico 1944 only - May 1 0:00 0 S
2204Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2205Rule Mexico 1950 only - Jul 30 0:00 0 S
2206Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2207Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2208Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2209Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2210Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2211Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2212# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2213# Quintana Roo
2214Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2215 -6:00 - CST 1981 Dec 23
2216 -5:00 Mexico E%sT 1998 Aug 2 2:00
2217 -6:00 Mexico C%sT
2218# Campeche, Yucatan
2219Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2220 -6:00 - CST 1981 Dec 23
2221 -5:00 - EST 1982 Dec 2
2222 -6:00 Mexico C%sT
2223# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2224Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2225 -6:00 - CST 1988
2226 -6:00 US C%sT 1989
2227 -6:00 Mexico C%sT 2010
2228 -6:00 US C%sT
2229# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2230Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2231 -6:00 - CST 1988
2232 -6:00 US C%sT 1989
2233 -6:00 Mexico C%sT
2234# Central Mexico
2235Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2236 -7:00 - MST 1927 Jun 10 23:00
2237 -6:00 - CST 1930 Nov 15
2238 -7:00 - MST 1931 May 1 23:00
2239 -6:00 - CST 1931 Oct
2240 -7:00 - MST 1932 Apr 1
2241 -6:00 Mexico C%sT 2001 Sep 30 02:00
2242 -6:00 - CST 2002 Feb 20
2243 -6:00 Mexico C%sT
2244# Chihuahua (near US border)
2245Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2246 -7:00 - MST 1927 Jun 10 23:00
2247 -6:00 - CST 1930 Nov 15
2248 -7:00 - MST 1931 May 1 23:00
2249 -6:00 - CST 1931 Oct
2250 -7:00 - MST 1932 Apr 1
2251 -6:00 - CST 1996
2252 -6:00 Mexico C%sT 1998
2253 -6:00 - CST 1998 Apr Sun>=1 3:00
2254 -7:00 Mexico M%sT 2010
2255 -7:00 US M%sT
2256# Chihuahua (away from US border)
2257Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2258 -7:00 - MST 1927 Jun 10 23:00
2259 -6:00 - CST 1930 Nov 15
2260 -7:00 - MST 1931 May 1 23:00
2261 -6:00 - CST 1931 Oct
2262 -7:00 - MST 1932 Apr 1
2263 -6:00 - CST 1996
2264 -6:00 Mexico C%sT 1998
2265 -6:00 - CST 1998 Apr Sun>=1 3:00
2266 -7:00 Mexico M%sT
2267# Sonora
2268Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2269 -7:00 - MST 1927 Jun 10 23:00
2270 -6:00 - CST 1930 Nov 15
2271 -7:00 - MST 1931 May 1 23:00
2272 -6:00 - CST 1931 Oct
2273 -7:00 - MST 1932 Apr 1
2274 -6:00 - CST 1942 Apr 24
2275 -7:00 - MST 1949 Jan 14
2276 -8:00 - PST 1970
2277 -7:00 Mexico M%sT 1999
2278 -7:00 - MST
2279
2280# From Alexander Krivenyshev (2010-04-21):
2281# According to news, Bah&iacute;a de Banderas (Mexican state of Nayarit)
2282# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2283# share the same time zone as nearby city Puerto Vallarta, Jalisco).
2284#
2285# (Spanish)
2286# Bah&iacute;a de Banderas homologa su horario al del centro del
2287# pa&iacute;s, a partir de este domingo
2288# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2289# http://www.nayarit.gob.mx/notes.asp?id=20748
2290# </a>
2291#
2292# Bah&iacute;a de Banderas homologa su horario con el del Centro del
2293# Pa&iacute;s
2294# <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">
2295# 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"
2296# </a>
2297#
2298# (English)
2299# Puerto Vallarta and Bah&iacute;a de Banderas: One Time Zone
2300# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2301# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2302# </a>
2303#
2304# or
2305# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2306# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2307# </a>
2308#
2309# "Mexico's Senate approved the amendments to the Mexican Schedule System that
2310# will allow Bah&iacute;a de Banderas and Puerto Vallarta to share the same time
2311# zone ..."
2312# Baja California Sur, Nayarit, Sinaloa
2313
2314# From Arthur David Olson (2010-05-01):
2315# Use "Bahia_Banderas" to keep the name to fourteen characters.
2316
2317Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2318 -7:00 - MST 1927 Jun 10 23:00
2319 -6:00 - CST 1930 Nov 15
2320 -7:00 - MST 1931 May 1 23:00
2321 -6:00 - CST 1931 Oct
2322 -7:00 - MST 1932 Apr 1
2323 -6:00 - CST 1942 Apr 24
2324 -7:00 - MST 1949 Jan 14
2325 -8:00 - PST 1970
2326 -7:00 Mexico M%sT
2327
2328Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2329 -7:00 - MST 1927 Jun 10 23:00
2330 -6:00 - CST 1930 Nov 15
2331 -7:00 - MST 1931 May 1 23:00
2332 -6:00 - CST 1931 Oct
2333 -7:00 - MST 1932 Apr 1
2334 -6:00 - CST 1942 Apr 24
2335 -7:00 - MST 1949 Jan 14
2336 -8:00 - PST 1970
2337 -7:00 Mexico M%sT 2010 Apr 4 2:00
2338 -6:00 Mexico C%sT
2339
2340# Baja California (near US border)
2341Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2342 -7:00 - MST 1924
2343 -8:00 - PST 1927 Jun 10 23:00
2344 -7:00 - MST 1930 Nov 15
2345 -8:00 - PST 1931 Apr 1
2346 -8:00 1:00 PDT 1931 Sep 30
2347 -8:00 - PST 1942 Apr 24
2348 -8:00 1:00 PWT 1945 Aug 14 23:00u
2349 -8:00 1:00 PPT 1945 Nov 12 # Peace
2350 -8:00 - PST 1948 Apr 5
2351 -8:00 1:00 PDT 1949 Jan 14
2352 -8:00 - PST 1954
2353 -8:00 CA P%sT 1961
2354 -8:00 - PST 1976
2355 -8:00 US P%sT 1996
2356 -8:00 Mexico P%sT 2001
2357 -8:00 US P%sT 2002 Feb 20
2358 -8:00 Mexico P%sT 2010
2359 -8:00 US P%sT
2360# Baja California (away from US border)
2361Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2362 -7:00 - MST 1924
2363 -8:00 - PST 1927 Jun 10 23:00
2364 -7:00 - MST 1930 Nov 15
2365 -8:00 - PST 1931 Apr 1
2366 -8:00 1:00 PDT 1931 Sep 30
2367 -8:00 - PST 1942 Apr 24
2368 -8:00 1:00 PWT 1945 Aug 14 23:00u
2369 -8:00 1:00 PPT 1945 Nov 12 # Peace
2370 -8:00 - PST 1948 Apr 5
2371 -8:00 1:00 PDT 1949 Jan 14
2372 -8:00 - PST 1954
2373 -8:00 CA P%sT 1961
2374 -8:00 - PST 1976
2375 -8:00 US P%sT 1996
2376 -8:00 Mexico P%sT 2001
2377 -8:00 US P%sT 2002 Feb 20
2378 -8:00 Mexico P%sT
2379# From Paul Eggert (2006-03-22):
2380# Formerly there was an America/Ensenada zone, which differed from
2381# America/Tijuana only in that it did not observe DST from 1976
2382# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2383# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2384# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2385# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2386# DST-observance was a town-by-town matter back then. This concerns
2387# data after 1970 so most likely there should be at least one Zone
2388# other than America/Tijuana for Baja, but it's not clear yet what its
2389# name or contents should be.
2390#
2391# Revillagigedo Is
2392# no information
2393
2394###############################################################################
2395
2396# Anguilla
2397# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2398Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2399 -4:00 - AST
2400
2401# Antigua and Barbuda
2402# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2403Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2404 -5:00 - EST 1951
2405 -4:00 - AST
2406
2407# Bahamas
2408#
2409# From Sue Williams (2006-12-07):
2410# The Bahamas announced about a month ago that they plan to change their DST
2411# rules to sync with the U.S. starting in 2007....
2412# http://www.jonesbahamas.com/?c=45&a=10412
2413
2414# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2415Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2416Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2417# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2418Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
2419 -5:00 Bahamas E%sT 1976
2420 -5:00 US E%sT
2421
2422# Barbados
2423# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2424Rule Barb 1977 only - Jun 12 2:00 1:00 D
2425Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2426Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2427Rule Barb 1979 only - Sep 30 2:00 0 S
2428Rule Barb 1980 only - Sep 25 2:00 0 S
2429# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2430Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
2431 -3:58:28 - BMT 1932 # Bridgetown Mean Time
2432 -4:00 Barb A%sT
2433
2434# Belize
2435# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2436# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2437Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2438Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2439Rule Belize 1973 only - Dec 5 0:00 1:00 D
2440Rule Belize 1974 only - Feb 9 0:00 0 S
2441Rule Belize 1982 only - Dec 18 0:00 1:00 D
2442Rule Belize 1983 only - Feb 12 0:00 0 S
2443# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2444Zone America/Belize -5:52:48 - LMT 1912 Apr
2445 -6:00 Belize C%sT
2446
2447# Bermuda
2448
2449# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2450
2451# Next year, however, clocks in the US will go forward on the second Sunday
2452# in March, until the first Sunday in November. And, after the Time Zone
2453# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2454# Friday, the same thing will happen in Bermuda.
2455# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2456
2457# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2458Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
2459 -4:00 - AST 1974 Apr 28 2:00
2460 -4:00 Bahamas A%sT 1976
2461 -4:00 US A%sT
2462
2463# Cayman Is
2464# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2465Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2466 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2467 -5:00 - EST
2468
2469# Costa Rica
2470# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2471Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2472Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2473Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2474# IATA SSIM (1991-09) says the following was at 1:00;
2475# go with Shanks & Pottenger.
2476Rule CR 1991 only - Jul 1 0:00 0 S
2477Rule CR 1992 only - Mar 15 0:00 0 S
2478# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2479# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2480Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
2481 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
2482 -6:00 CR C%sT
2483# Coco
2484# no information; probably like America/Costa_Rica
2485
2486# Cuba
2487
2488# From Arthur David Olson (1999-03-29):
2489# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2490# the Cuban National Team and the Baltimore Orioles was carried live on
2491# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2492# During the game, play-by-play announcer Jim Hunter noted that
2493# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2494# Time today." (The "two hour" remark referred to losing one hour of
2495# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2496# to DST--and one more hour on 1999-04-04--when the announcers will have
2497# returned to Baltimore, which switches on that date.)
2498
2499# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2500# Cuba is not going back to standard time this year.
2501# From Paul Eggert (2006-03-22):
2502# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2503# says that it's due to a problem at the Antonio Guiteras
2504# thermoelectric plant, and says "This October there will be no return
2505# to normal hours (after daylight saving time)".
2506# For now, let's assume that it's a temporary measure.
2507
2508# From Carlos A. Carnero Delgado (2005-11-12):
2509# This year (just like in 2004-2005) there's no change in time zone
2510# adjustment in Cuba. We will stay in daylight saving time:
2511# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2512
2513# From Jesper Norgaard Welen (2006-10-21):
2514# An article in GRANMA INTERNACIONAL claims that Cuba will end
2515# the 3 years of permanent DST next weekend, see
2516# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2517# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2518# watches should be set back one hour -- going back to 00:00 hours -- returning
2519# to the normal schedule....
2520
2521# From Paul Eggert (2007-03-02):
2522# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2523# says Cuban clocks will advance at midnight on March 10.
2524# For lack of better information, assume Cuba will use US rules,
2525# except that it switches at midnight standard time as usual.
2526#
2527# From Steffen Thorsen (2007-10-25):
2528# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2529# earlier - on the last Sunday of October, just like in 2006.
2530#
2531# He supplied these references:
2532#
2533# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2534# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2535#
2536# From Alex Kryvenishev (2007-10-25):
2537# Here is also article from Granma (Cuba):
2538#
2539# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2540# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2541#
2542# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2543
2544# From Arthur David Olson (2008-03-09):
2545# I'm in Maryland which is now observing United States Eastern Daylight
2546# Time. At 9:44 local time I used RealPlayer to listen to
2547# <a href="http://media.enet.cu/radioreloj">
2548# http://media.enet.cu/radioreloj
2549# </a>, a Cuban information station, and heard
2550# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2551# indicating that Cuba is still on standard time.
2552
2553# From Steffen Thorsen (2008-03-12):
2554# It seems that Cuba will start DST on Sunday, 2007-03-16...
2555# It was announced yesterday, according to this source (in Spanish):
2556# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2557# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2558# </a>
2559#
2560# Some more background information is posted here:
2561# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2562# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2563# </a>
2564#
2565# The article also says that Cuba has been observing DST since 1963,
2566# while Shanks (and tzdata) has 1965 as the first date (except in the
2567# 1940's). Many other web pages in Cuba also claim that it has been
2568# observed since 1963, but with the exception of 1970 - an exception
2569# which is not present in tzdata/Shanks. So there is a chance we need to
2570# change some historic records as well.
2571#
2572# One example:
2573# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2574# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2575# </a>
2576
2577# From Jesper Norgaard Welen (2008-03-13):
2578# The Cuban time change has just been confirmed on the most authoritative
2579# web site, the Granma. Please check out
2580# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2581# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2582# </a>
2583#
2584# Basically as expected after Steffen Thorsens information, the change
2585# will take place midnight between Saturday and Sunday.
2586
2587# From Arthur David Olson (2008-03-12):
2588# Assume Sun>=15 (third Sunday) going forward.
2589
2590# From Alexander Krivenyshev (2009-03-04)
2591# According to the Radio Reloj - Cuba will start Daylight Saving Time on
2592# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2593# not on midnight March 14 / March 15 as previously thought.
2594#
2595# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2596# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2597# (in Spanish)
2598# </a>
2599
2600# From Arthur David Olson (2009-03-09)
2601# I listened over the Internet to
2602# <a href="http://media.enet.cu/readioreloj">
2603# http://media.enet.cu/readioreloj
2604# </a>
2605# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2606# the time was announced as "diez cinco"--the same time as here, indicating
2607# that has indeed switched to DST. Assume second Sunday from 2009 forward.
2608
2609# From Steffen Thorsen (2011-03-08):
2610# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2611# this year. Nothing about the end date known so far (if that has
2612# changed at all).
2613#
2614# Source:
2615# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2616# http://granma.co.cu/2011/03/08/nacional/artic01.html
2617# </a>
2618#
2619# Our info:
2620# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2621# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2622# </a>
2623
2624# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2625Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2626Rule Cuba 1928 only - Oct 10 0:00 0 S
2627Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2628Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2629Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2630Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2631Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2632Rule Cuba 1965 only - Sep 30 0:00 0 S
2633Rule Cuba 1966 only - May 29 0:00 1:00 D
2634Rule Cuba 1966 only - Oct 2 0:00 0 S
2635Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2636Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2637Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2638Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2639Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2640Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2641Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2642Rule Cuba 1978 only - May 7 0:00 1:00 D
2643Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2644Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2645Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2646Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2647Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2648Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2649Rule Cuba 1996 only - Oct 6 0:00s 0 S
2650Rule Cuba 1997 only - Oct 12 0:00s 0 S
2651Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2652Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2653Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2654Rule Cuba 2006 max - Oct lastSun 0:00s 0 S
2655Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2656Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2642Rule Cuba 2009 max - Mar Sun>=8 0:00s 1:00 D
2657Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2658Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2659Rule Cuba 2012 max - Mar Sun>=8 0:00s 1:00 D
2660
2661# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2662Zone America/Havana -5:29:28 - LMT 1890
2663 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2664 -5:00 Cuba C%sT
2665
2666# Dominica
2667# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2668Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2669 -4:00 - AST
2670
2671# Dominican Republic
2672
2673# From Steffen Thorsen (2000-10-30):
2674# Enrique Morales reported to me that the Dominican Republic has changed the
2675# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2676# http://www.listin.com.do/antes/261000/republica/princi.html
2677
2678# From Paul Eggert (2000-12-04):
2679# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2680
2681# From Rives McDow (2000-12-01):
2682# Dominican Republic changed its mind and presidential decree on Tuesday,
2683# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2684# Dominican Republic will be reverting to 8 hours from the International Date
2685# Line, and will not be using DST in the foreseeable future. The reason they
2686# decided to use DST was to be in synch with Puerto Rico, who was also going
2687# to implement DST. When Puerto Rico didn't implement DST, the president
2688# decided to revert.
2689
2690
2691# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2692Rule DR 1966 only - Oct 30 0:00 1:00 D
2693Rule DR 1967 only - Feb 28 0:00 0 S
2694Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2695Rule DR 1970 only - Feb 21 0:00 0 S
2696Rule DR 1971 only - Jan 20 0:00 0 S
2697Rule DR 1972 1974 - Jan 21 0:00 0 S
2698# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2699Zone America/Santo_Domingo -4:39:36 - LMT 1890
2700 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2701 -5:00 DR E%sT 1974 Oct 27
2702 -4:00 - AST 2000 Oct 29 02:00
2703 -5:00 US E%sT 2000 Dec 3 01:00
2704 -4:00 - AST
2705
2706# El Salvador
2707
2708# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2709Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2710Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2711# There are too many San Salvadors elsewhere, so use America/El_Salvador
2712# instead of America/San_Salvador.
2713# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2714Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2715 -6:00 Salv C%sT
2716
2717# Grenada
2718# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2719Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2720 -4:00 - AST
2721
2722# Guadeloupe
2723# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2724Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2725 -4:00 - AST
2726# St Barthelemy
2727Link America/Guadeloupe America/St_Barthelemy
2728# St Martin (French part)
2729Link America/Guadeloupe America/Marigot
2730
2731# Guatemala
2732#
2733# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2734# Diario Co Latino, at
2735# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2736# says in an article dated 2006-04-19 that the Guatemalan government had
2737# decided on that date to advance official time by 60 minutes, to lessen the
2738# impact of the elevated cost of oil.... Daylight saving time will last from
2739# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2740# From Paul Eggert (2006-06-22):
2741# The Ministry of Energy and Mines, press release CP-15/2006
2742# (2006-04-19), says DST ends at 24:00. See
2743# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2744
2745# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2746Rule Guat 1973 only - Nov 25 0:00 1:00 D
2747Rule Guat 1974 only - Feb 24 0:00 0 S
2748Rule Guat 1983 only - May 21 0:00 1:00 D
2749Rule Guat 1983 only - Sep 22 0:00 0 S
2750Rule Guat 1991 only - Mar 23 0:00 1:00 D
2751Rule Guat 1991 only - Sep 7 0:00 0 S
2752Rule Guat 2006 only - Apr 30 0:00 1:00 D
2753Rule Guat 2006 only - Oct 1 0:00 0 S
2754# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2755Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2756 -6:00 Guat C%sT
2757
2758# Haiti
2759# From Gwillim Law (2005-04-15):
2760# Risto O. Nykanen wrote me that Haiti is now on DST.
2761# I searched for confirmation, and I found a
2762# <a href="http://www.haitianconsulate.org/time.doc"> press release
2763# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2764# </a>. Translated from French, it says:
2765#
2766# "The Prime Minister's Communication Office notifies the public in general
2767# and the press in particular that, following a decision of the Interior
2768# Ministry and the Territorial Collectivities [I suppose that means the
2769# provinces], Haiti will move to Eastern Daylight Time in the night from next
2770# Saturday the 2nd to Sunday the 3rd.
2771#
2772# "Consequently, the Prime Minister's Communication Office wishes to inform
2773# the population that the country's clocks will be set forward one hour
2774# starting at midnight. This provision will hold until the last Saturday in
2775# October 2005.
2776#
2777# "Port-au-Prince, March 31, 2005"
2778#
2779# From Steffen Thorsen (2006-04-04):
2780# I have been informed by users that Haiti observes DST this year like
2781# last year, so the current "only" rule for 2005 might be changed to a
2782# "max" rule or to last until 2006. (Who knows if they will observe DST
2783# next year or if they will extend their DST like US/Canada next year).
2784#
2785# I have found this article about it (in French):
2786# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2787#
2788# The reason seems to be an energy crisis.
2789
2790# From Stephen Colebourne (2007-02-22):
2791# Some IATA info: Haiti won't be having DST in 2007.
2792
2793
2794# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2795Rule Haiti 1983 only - May 8 0:00 1:00 D
2796Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
2797Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
2798# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
2799# Go with IATA.
2800Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
2801Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
2802Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
2803Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
2804# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2805Zone America/Port-au-Prince -4:49:20 - LMT 1890
2806 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
2807 -5:00 Haiti E%sT
2808
2809# Honduras
2810# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
2811
2812# From Paul Eggert (2006-05-05):
2813# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
2814# saying Honduras will start using DST midnight Saturday, effective 4
2815# months until September. La Tribuna reported today
2816# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
2817# of Honduras, refused to back down on this.
2818
2819# From Jesper Norgaard Welen (2006-08-08):
2820# It seems that Honduras has returned from DST to standard time this Monday at
2821# 00:00 hours (prolonging Sunday to 25 hours duration).
2822# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
2823
2824# From Paul Eggert (2006-08-08):
2825# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
2826# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
2827# It mentions executive decree 18-2006.
2828
2829# From Steffen Thorsen (2006-08-17):
2830# Honduras will observe DST from 2007 to 2009, exact dates are not
2831# published, I have located this authoritative source:
2832# http://www.presidencia.gob.hn/noticia.aspx?nId=47
2833
2834# From Steffen Thorsen (2007-03-30):
2835# http://www.laprensahn.com/pais_nota.php?id04962=7386
2836# So it seems that Honduras will not enter DST this year....
2837
2838# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2839Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
2840Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
2841Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
2842Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
2843# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2844Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
2845 -6:00 Hond C%sT
2846#
2847# Great Swan I ceded by US to Honduras in 1972
2848
2849# Jamaica
2850
2851# From Bob Devine (1988-01-28):
2852# Follows US rules.
2853
2854# From U. S. Naval Observatory (1989-01-19):
2855# JAMAICA 5 H BEHIND UTC
2856
2857# From Shanks & Pottenger:
2858# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2859Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
2860 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2861 -5:00 - EST 1974 Apr 28 2:00
2862 -5:00 US E%sT 1984
2863 -5:00 - EST
2864
2865# Martinique
2866# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2867Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
2868 -4:04:20 - FFMT 1911 May # Fort-de-France MT
2869 -4:00 - AST 1980 Apr 6
2870 -4:00 1:00 ADT 1980 Sep 28
2871 -4:00 - AST
2872
2873# Montserrat
2874# From Paul Eggert (2006-03-22):
2875# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
2876# world.gazetteer.com says Cork Hill is the most populous location now.
2877# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2878Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
2879 -4:00 - AST
2880
2881# Nicaragua
2882#
2883# This uses Shanks & Pottenger for times before 2005.
2884#
2885# From Steffen Thorsen (2005-04-12):
2886# I've got reports from 8 different people that Nicaragua just started
2887# DST on Sunday 2005-04-10, in order to save energy because of
2888# expensive petroleum. The exact end date for DST is not yet
2889# announced, only "September" but some sites also say "mid-September".
2890# Some background information is available on the President's official site:
2891# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
2892# The Decree, no 23-2005 is available here:
2893# 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
2894#
2895# From Paul Eggert (2005-05-01):
2896# The decree doesn't say anything about daylight saving, but for now let's
2897# assume that it is daylight saving....
2898#
2899# From Gwillim Law (2005-04-21):
2900# The Associated Press story on the time change, which can be found at
2901# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
2902# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
2903# time that a change of clocks was applied to save energy was in the year 2000
2904# during the Arnoldo Aleman administration."...
2905# The northamerica file says that Nicaragua has been on UTC-6 continuously
2906# since December 1998. I wasn't able to find any details of Nicaraguan time
2907# changes in 2000. Perhaps a note could be added to the northamerica file, to
2908# the effect that we have indirect evidence that DST was observed in 2000.
2909#
2910# From Jesper Norgaard Welen (2005-11-02):
2911# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
2912# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
2913# (2005-09-26)
2914#
2915# From Jesper Norgaard Welen (2006-05-05):
2916# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
2917# (my informal translation)
2918# By order of the president of the republic, Enrique Bolanos, Nicaragua
2919# advanced by sixty minutes their official time, yesterday at 2 in the
2920# morning, and will stay that way until 30.th. of september.
2921#
2922# From Jesper Norgaard Welen (2006-09-30):
2923# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
2924# My informal translation runs:
2925# The natural sun time is restored in all the national territory, in that the
2926# time is returned one hour at 01:00 am of October 1 of 2006.
2927#
2928# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2929Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
2930Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
2931Rule Nic 2005 only - Apr 10 0:00 1:00 D
2932Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
2933Rule Nic 2006 only - Apr 30 2:00 1:00 D
2934Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
2935# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2936Zone America/Managua -5:45:08 - LMT 1890
2937 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
2938 -6:00 - CST 1973 May
2939 -5:00 - EST 1975 Feb 16
2940 -6:00 Nic C%sT 1992 Jan 1 4:00
2941 -5:00 - EST 1992 Sep 24
2942 -6:00 - CST 1993
2943 -5:00 - EST 1997
2944 -6:00 Nic C%sT
2945
2946# Panama
2947# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2948Zone America/Panama -5:18:08 - LMT 1890
2949 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
2950 -5:00 - EST
2951
2952# Puerto Rico
2953# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
2954# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2955Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
2956 -4:00 - AST 1942 May 3
2957 -4:00 US A%sT 1946
2958 -4:00 - AST
2959
2960# St Kitts-Nevis
2961# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2962Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
2963 -4:00 - AST
2964
2965# St Lucia
2966# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2967Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
2968 -4:04:00 - CMT 1912 # Castries Mean Time
2969 -4:00 - AST
2970
2971# St Pierre and Miquelon
2972# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
2973# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2974Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
2975 -4:00 - AST 1980 May
2976 -3:00 - PMST 1987 # Pierre & Miquelon Time
2977 -3:00 Canada PM%sT
2978
2979# St Vincent and the Grenadines
2980# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2981Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
2982 -4:04:56 - KMT 1912 # Kingstown Mean Time
2983 -4:00 - AST
2984
2985# Turks and Caicos
2986#
2987# From Chris Dunn in
2988# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
2989# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
2990# daylight saving dates for time changes have been adjusted to match
2991# the recent U.S. change of dates.
2992#
2993# From Brian Inglis (2007-04-28):
2994# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
2995# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
2996# rows before that there is an out of date entry for Oct:
2997# "Eastern Standard Times Begins 2007
2998# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
2999# indicating that the normal ET rules are followed.
3000#
3001# From Paul Eggert (2006-05-01):
3002# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3003# says they switch at midnight. Go with Shanks & Pottenger.
3004#
3005# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3006Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3007Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3008Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3009Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3010Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3011# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3012Zone America/Grand_Turk -4:44:32 - LMT 1890
3013 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3014 -5:00 TC E%sT
3015
3016# British Virgin Is
3017# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3018Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
3019 -4:00 - AST
3020
3021# Virgin Is
3022# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3023Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
3024 -4:00 - AST