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c3a08f59 1# @(#)northamerica 7.62
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2# also includes Central America and the Caribbean
3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
b51d5b5f 8# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
1815bff5 9# A reliable and entertaining source about time zones is
b51d5b5f 10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
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11
12###############################################################################
13
14# United States
15
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16# From Paul Eggert (1999-03-31):
17# Howse writes (pp 121-125) that time zones were invented by
18# Professor Charles Ferdinand Dowd (1825-1904),
19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
20# His pamphlet ``A System of National Time for Railroads'' (1870)
21# was the result of his proposals at the Convention of Railroad Trunk Lines
22# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
23# but in 1872-05 he moved the proposed origin to Greenwich.
24# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
25# and the most of the country soon followed suit.
26
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27# From Paul Eggert <eggert@twinsun.com> (1995-12-19):
28# A good source for time zone historical data in the US is
29# Thomas G. Shanks, The American Atlas (5th edition),
30# San Diego: ACS Publications, Inc. (1991).
31# Make sure you have the errata sheet; the book is somewhat useless without it.
32# It is the source for the US and Puerto Rico entries below.
33
b51d5b5f 34# From Paul Eggert (2001-03-06):
1815bff5 35# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
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36# in his whimsical essay ``An Economical Project for Diminishing the Cost
37# of Light'' published in the Journal de Paris (1784-04-26).
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38# Not everyone is happy with the results:
39#
40# I don't really care how time is reckoned so long as there is some
41# agreement about it, but I object to being told that I am saving
42# daylight when my reason tells me that I am doing nothing of the kind.
43# I even object to the implication that I am wasting something
44# valuable if I stay in bed after the sun has risen. As an admirer
45# of moonlight I resent the bossy insistence of those who want to
46# reduce my time for enjoying it. At the back of the Daylight Saving
47# scheme I detect the bony, blue-fingered hand of Puritanism, eager
48# to push people into bed earlier, and get them up earlier, to make
49# them healthy, wealthy and wise in spite of themselves.
50#
51# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
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52#
53# For more about the first ten years of DST in the United States, see
54# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
55# Ten years of daylight saving from the Pittsburgh standpoint
56# (Carnegie Library of Pittsburgh, 1927)</a>.
57#
58# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
59# However, DST was imposed by the Standard Time Act of 1918, which
60# was the first nationwide legal time standard, and apparently
61# time was just called "Standard Time" or "Daylight Saving Time".
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62
63# From Arthur David Olson:
64# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
65# See, for example, the front page of the Saturday, 1974-10-26
66# and Sunday, 1974-10-27 editions of the Washington Post.
67
68# From Arthur David Olson:
69# Before the Uniform Time Act of 1966 took effect in 1967, observance of
70# Daylight Saving Time in the US was by local option, except during wartime.
71
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72# From Arthur David Olson (2000-09-25):
73# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
74# In the introduction, Oboler spoke of "Eastern Peace Time."
75# An AltaVista search turned up
76# <a href="http://rowayton.org/rhs/hstaug45.html">:
77# "When the time is announced over the radio now, it is 'Eastern Peace
78# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
79# </a> (August 1945) by way of confirmation.
80
81# From Joseph Gallant <notquite@hotmail.com>, citing
82# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
83# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
c3a08f59 84# to switch to London for Attlee's address, but the American people
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85# never got to hear his speech live. According to one press account,
86# CBS' Bob Trout was first to announce the word of Japan's surrender,
87# but a few seconds later, NBC, ABC and Mutual also flashed the word
88# of surrender, all of whom interrupting the bells of Big Ben in
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89# London which were to precede Mr. Attlee's speech.
90
91# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
92# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
93#
94# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
95# Any announcement from Asia would reach St. John's New York newsroom on a
96# wire service teletype machine, which had prescribed signals for major news.
97# Associated Press, for example, would ring five bells before spewing out
98# typed copy of an important story, and 10 bells for news "of transcendental
99# importance."
100#
101# On Aug. 14, stalling while talking steadily into the NBC networks' open
102# microphone, St. John heard five bells and waited only to hear a sixth bell,
103# before announcing confidently: "Ladies and gentlemen, World War II is over.
104# The Japanese have agreed to our surrender terms."
105#
106# He had scored a 20-second scoop on other broadcasters.
b51d5b5f 107
1815bff5 108# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
b51d5b5f 109Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
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110Rule US 1918 1919 - Oct lastSun 2:00 0 S
111Rule US 1942 only - Feb 9 2:00 1:00 W # War
b51d5b5f 112Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
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113Rule US 1945 only - Sep 30 2:00 0 S
114Rule US 1967 max - Oct lastSun 2:00 0 S
115Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
116Rule US 1974 only - Jan 6 2:00 1:00 D
117Rule US 1975 only - Feb 23 2:00 1:00 D
118Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
119Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
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120# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
121# H.R.177
122# </a> (introduced 1999-01-06) would change April to March in the above rule.
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123
124# From Bob Devine (1988-01-28):
125# ...Alaska (and Hawaii) had the timezone names changed in 1967.
126# old new
127# Pacific Standard Time(PST) -same-
128# Yukon Standard Time(YST) -same-
129# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
130# Nome Standard Time (NT) Bering Standard Time (BST)
131#
132# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
133# The YST zone now covers nearly all of the state, AHST just part
134# of the Aleutian islands. No DST.
135
136# From Paul Eggert (1995-12-19):
137# The tables below use `NST', not `NT', for Nome Standard Time.
138# I invented `CAWT' for Central Alaska War Time.
139
140# From U. S. Naval Observatory (1989-01-19):
141# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
142# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
143# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
144# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
145# USA MOUNTAIN 7 H BEHIND UTC DENVER
146# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
147# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
148# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
149# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
150# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
151# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
152# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
153# USA HAWAII 10 H BEHIND UTC
154# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
155
156# From Arthur David Olson (1989-01-21):
157# The above dates are for 1988.
158# Note the "AKST" and "AKDT" abbreviations, the claim that there's
159# no DST in Samoa, and the claim that there is DST in Alaska and the
160# Aleutians.
161
162# From Arthur David Olson (1988-02-13):
163# Legal standard time zone names, from United States Code (1982 Edition and
164# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
165# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
166# took effect), as explained in sections 263 and 261:
167# (none)
168# United States standard eastern time
169# United States standard mountain time
170# United States standard central time
171# United States standard Pacific time
172# (none)
173# United States standard Alaska time
174# (none)
175# Next, names from 1967-04-01 until 1983-11-30 (the date for
176# public law 98-181):
177# Atlantic standard time
178# eastern standard time
179# central standard time
180# mountain standard time
181# Pacific standard time
182# Yukon standard time
183# Alaska-Hawaii standard time
184# Bering standard time
185# And after 1983-11-30:
186# Atlantic standard time
187# eastern standard time
188# central standard time
189# mountain standard time
190# Pacific standard time
191# Alaska standard time
192# Hawaii-Aleutian standard time
193# Samoa standard time
194# The law doesn't give abbreviations.
195#
196# From Paul Eggert (1995-12-19):
197# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
198# Go with Shanks.
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199#
200# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
201# Public law 106-564 (2000-12-23) introduced the abbreviation
202# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
203# See the file "australasia".
204
b51d5b5f 205
c3a08f59 206# US eastern time, represented by New York
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207
208# Connecticut, Delaware, District of Columbia, most of Florida,
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209# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and
210# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts,
211# New Hampshire, New Jersey, New York, North Carolina, Ohio,
212# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
213# Vermont, Virginia, West Virginia
b51d5b5f 214
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215# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
216Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
217Rule NYC 1920 only - Oct lastSun 2:00 0 S
218Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
219Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
220Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
221# Zone NAME GMTOFF RULES FORMAT [UNTIL]
222Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
223 -5:00 US E%sT 1920
224 -5:00 NYC E%sT 1942
225 -5:00 US E%sT 1946
226 -5:00 NYC E%sT 1967
227 -5:00 US E%sT
228
c3a08f59 229# US central time, represented by Chicago
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230
231# Alabama, Arkansas, Florida panhandle, Illinois, western Indiana
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232# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
233# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
234# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
235# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
236# western Tennessee, most of Texas, Wisconsin
b51d5b5f 237
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238# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
239Rule Chicago 1920 only - Jun 13 2:00 1:00 D
240Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
241Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
242Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
243Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
244Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
245# Zone NAME GMTOFF RULES FORMAT [UNTIL]
246Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
247 -6:00 US C%sT 1920
248 -6:00 Chicago C%sT 1936 Mar 1 2:00
249 -5:00 - EST 1936 Nov 15 2:00
250 -6:00 Chicago C%sT 1942
251 -6:00 US C%sT 1946
252 -6:00 Chicago C%sT 1967
253 -6:00 US C%sT
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254# Oliver County, ND switched from mountain to central time on 1992-10-25.
255Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00
256 -7:00 US M%sT 1992 Oct 25 02:00
257 -6:00 US C%sT
1815bff5 258
c3a08f59 259# US mountain time, represented by Denver
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260#
261# Colorado, southern Idaho, far western Kansas, Montana, western
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262# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
263# New Mexico, southwestern North Dakota, far eastern Oregon,
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264# western South Dakota, far western Texas (El Paso County, Hudspeth County,
265# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
266#
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267# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
268Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
269Rule Denver 1920 only - Oct lastSun 2:00 0 S
270Rule Denver 1921 only - May 22 2:00 0 S
271Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
272Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
273# Zone NAME GMTOFF RULES FORMAT [UNTIL]
274Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
275 -7:00 US M%sT 1920
276 -7:00 Denver M%sT 1942
277 -7:00 US M%sT 1946
278 -7:00 Denver M%sT 1967
279 -7:00 US M%sT
280
281# US Pacific time, represented by Los Angeles
b51d5b5f 282#
c3a08f59 283# California, northern Idaho, most of Nevada, most of Oregon, and Washington
b51d5b5f 284#
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285# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
286Rule CA 1948 only - Mar 14 2:00 1:00 D
287Rule CA 1949 only - Jan 1 2:00 0 S
288Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
289Rule CA 1950 1961 - Sep lastSun 2:00 0 S
290Rule CA 1962 1966 - Oct lastSun 2:00 0 S
291# Zone NAME GMTOFF RULES FORMAT [UNTIL]
292Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
293 -8:00 US P%sT 1946
294 -8:00 CA P%sT 1967
295 -8:00 US P%sT
296
297# Alaska
298# AK%sT is the modern abbreviation for -9:00 per USNO.
299#
c3a08f59 300# From Paul Eggert (2001-05-30):
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301# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
302# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
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303# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
304# also a Friday. Include only the time zone part of this transition,
305# ignoring the switch from Julian to Gregorian, since we can't represent
306# the Julian calendar.
1815bff5 307#
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308# As far as we know, none of the exact locations mentioned below were
309# permanently inhabited in 1867 by anyone using either calendar.
310# (Yakutat was colonized by the Russians in 1799, but the settlement
311# was destroyed in 1805 by a Yakutat-kon war party.) However, there
312# were nearby inhabitants in some cases and for our purposes perhaps
313# it's best to simply use the official transition.
314#
1815bff5 315# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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316Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
317 -8:57:41 - LMT 1900 Aug 20 12:00
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318 -8:00 - PST 1942
319 -8:00 US P%sT 1946
320 -8:00 - PST 1969
321 -8:00 US P%sT 1983 Oct 30 2:00
322 -9:00 US AK%sT
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323Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
324 -9:18:55 - LMT 1900 Aug 20 12:00
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325 -9:00 - YST 1942
326 -9:00 US Y%sT 1946
327 -9:00 - YST 1969
328 -9:00 US Y%sT 1983 Oct 30 2:00
329 -9:00 US AK%sT
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330Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
331 -9:59:36 - LMT 1900 Aug 20 12:00
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332 -10:00 - CAT 1942
333 -10:00 US CAT/CAWT 1946
334 -10:00 - CAT 1967 Apr
335 -10:00 - AHST 1969
336 -10:00 US AH%sT 1983 Oct 30 2:00
337 -9:00 US AK%sT
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338Zone America/Nome 12:58:21 - LMT 1867 Oct 18
339 -11:01:38 - LMT 1900 Aug 20 12:00
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340 -11:00 - NST 1942
341 -11:00 US N%sT 1946
342 -11:00 - NST 1967 Apr
343 -11:00 - BST 1969
344 -11:00 US B%sT 1983 Oct 30 2:00
345 -9:00 US AK%sT
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346Zone America/Adak 12:13:21 - LMT 1867 Oct 18
347 -11:46:38 - LMT 1900 Aug 20 12:00
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348 -11:00 - NST 1942
349 -11:00 US N%sT 1946
350 -11:00 - NST 1967 Apr
351 -11:00 - BST 1969
352 -11:00 US B%sT 1983 Oct 30 2:00
353 -10:00 US HA%sT
354# Shanks writes that part of southwest Alaska (e.g. Aniak)
355# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
356# and another part (e.g. Akiak) made the same switch five weeks later.
357# These switches don't quite make our 1970 cutoff.
358
359# Hawaii
360#
361# From Arthur David Olson:
362# And then there's Hawaii.
363# DST was observed for one day in 1933;
364# standard time was changed by half an hour in 1947;
365# it's always standard as of 1986.
366#
367# From Paul Eggert:
368# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
369#
370Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
371 -10:30 - HST 1933 Apr 30 2:00
372 -10:30 1:00 HDT 1933 May 21 2:00
373 -10:30 US H%sT 1947 Jun 8 2:00
374 -10:00 - HST
375
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376# Now we turn to US areas that have diverged from the consensus since 1970.
377
378# Arizona mostly uses MST.
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379
380# From Paul Eggert (2002-10-20):
381#
382# The information in the rest of this paragraph is derived from the
383# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
384# Daylight Saving Time web page (2002-01-23)</a> maintained by the
385# Arizona State Library, Archives and Public Records.
386# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
387# time, but by federal law railroads, airlines, bus lines, military
388# personnel, and some engaged in interstate commerce continued to
389# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
390# Gazette says that was the date the law changed, and that 04-01 was
391# the date the state's clocks would change. In 1945 the State of
392# Arizona used standard time all year, again with exceptions only as
393# mandated by federal law. Arizona observed DST in 1967, but Arizona
394# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
395#
396# Shanks says the 1944 experiment came to an end on 1944-03-17.
397# Go with the Arizona State Library instead.
398
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399Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
400 -7:00 US M%sT 1944 Jan 1 00:01
c3a08f59 401 -7:00 - MST 1944 Apr 1 00:01
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402 -7:00 US M%sT 1944 Oct 1 00:01
403 -7:00 - MST 1967
c3a08f59 404 -7:00 US M%sT 1968 Mar 21
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405 -7:00 - MST
406# From Arthur David Olson (1988-02-13):
407# A writer from the Inter Tribal Council of Arizona, Inc.,
408# notes in private correspondence dated 12/28/87 that "Presently, only the
409# Navajo Nation participates in the Daylight Saving Time policy, due to its
410# large size and location in three states." (The "only" means that other
411# tribal nations don't use DST.)
412
413Link America/Denver America/Shiprock
414
415# Southern Idaho and eastern Oregon switched four weeks late in 1974.
416# Zone NAME GMTOFF RULES FORMAT [UNTIL]
417Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
418 -8:00 US P%sT 1923 May 13 2:00
419 -7:00 US M%sT 1974
420 -7:00 - MST 1974 Feb 3 2:00
421 -7:00 US M%sT
422
423# Indiana
424#
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425# For a map of Indiana's time zone regions, see:
426# <a href="http://www.mccsc.edu/time.html">
427# What time is it in Indiana?
428# </a> (1999-04-06)
429#
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430# From Paul Eggert (1995-12-19):
431# Indiana generally observes either EST all year, or CST/CDT,
432# but areas near Cincinnati and Louisville use those cities' timekeeping
433# and in 1969 and 1970 the whole state observed daylight time;
434# and there are other exceptions as noted below.
435# Shanks partitions Indiana into 345 regions, each with its own time history,
436# and writes ``Even newspaper reports present contradictory information.''
437# Fortunately, most of the complexity occurred before our cutoff date of 1970.
438#
439# Since 1970, EST-only Indiana has been like America/Indianapolis,
440# with exceptions noted below for Crawford, Starke, and Switzerland counties.
441# The parts of Indiana not listed below have been like America/Chicago,
442# America/Louisville, or America/New_York.
443#
444# Other than Indianapolis, the Indiana place names are so nondescript
445# that they would be ambiguous if we left them at the `America' level.
446# So we reluctantly put them all in a subdirectory `America/Indiana'.
447#
448# Most of EST-only Indiana last observed DST in 1970.
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449
450# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn:
451# Pam Belluck reported in the New York Times (2001-01-31) that the
452# Indiana Legislature is considering a bill to adopt DST statewide.
453# Her article mentioned Vevay, whose post office observes a different
c3a08f59 454# time zone from Danner's Hardware across the street.
b51d5b5f 455
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456# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
457Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
458Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
459Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
460# Zone NAME GMTOFF RULES FORMAT [UNTIL]
461Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
462 -6:00 US C%sT 1920
463 -6:00 Indianapolis C%sT 1942
464 -6:00 US C%sT 1946
465 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
466 -5:00 - EST 1957 Sep 29 2:00
467 -6:00 - CST 1958 Apr 27 2:00
468 -5:00 - EST 1969
469 -5:00 US E%sT 1971
470 -5:00 - EST
471Link America/Indianapolis America/Indiana/Indianapolis
472#
473# Part of Crawford County, Indiana, last observed DST in 1975,
474# and left its clocks alone in 1974.
475# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
476Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
477Rule Marengo 1951 only - Sep lastSun 2:00 0 S
478Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
479Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
480# Zone NAME GMTOFF RULES FORMAT [UNTIL]
481Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
482 -6:00 US C%sT 1951
483 -6:00 Marengo C%sT 1961 Apr 30 2:00
484 -5:00 - EST 1969
485 -5:00 US E%sT 1974 Jan 6 2:00
486 -6:00 1:00 CDT 1974 Oct 27 2:00
487 -5:00 US E%sT 1976
488 -5:00 - EST
489#
490# Starke County, Indiana
491# From Arthur David Olson (1991-10-28):
492# An article on page A3 of the Sunday, 1991-10-27 Washington Post
493# notes that Starke County switched from Central time to Eastern time as of
494# 1991-10-27.
495# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
496Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
497Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
498Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
499Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
500Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
501# Zone NAME GMTOFF RULES FORMAT [UNTIL]
502Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
503 -6:00 US C%sT 1947
504 -6:00 Starke C%sT 1962 Apr 29 2:00
505 -5:00 - EST 1963 Oct 27 2:00
506 -6:00 US C%sT 1991 Oct 27 2:00
507 -5:00 - EST
508#
509# Switzerland County, Indiana, last observed DST in 1972.
510# Zone NAME GMTOFF RULES FORMAT [UNTIL]
511Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
512 -6:00 US C%sT 1954 Apr 25 2:00
513 -5:00 - EST 1969
514 -5:00 US E%sT 1973
515 -5:00 - EST
516
517# Part of Kentucky left its clocks alone in 1974.
b51d5b5f 518# This also includes a part of Indiana immediately adjacent to Louisville.
1815bff5
A
519# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
520Rule Louisville 1921 only - May 1 2:00 1:00 D
521Rule Louisville 1921 only - Sep 1 2:00 0 S
522Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
523Rule Louisville 1941 only - Sep lastSun 2:00 0 S
524Rule Louisville 1946 only - Jun 2 2:00 0 S
525Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
526Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
527# Zone NAME GMTOFF RULES FORMAT [UNTIL]
528Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
529 -6:00 US C%sT 1921
530 -6:00 Louisville C%sT 1942
531 -6:00 US C%sT 1946
532 -6:00 Louisville C%sT 1961 Jul 23 2:00
533 -5:00 - EST 1968
534 -5:00 US E%sT 1974 Jan 6 2:00
535 -6:00 1:00 CDT 1974 Oct 27 2:00
536 -5:00 US E%sT
b51d5b5f
A
537Link America/Louisville America/Kentucky/Louisville
538#
539# Wayne, Clinton, and Russell Counties, Kentucky
540#
541# From
542# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
543# Lake Cumberland LIFE
544# </a> (1999-01-29) via WKYM-101.7:
545# Clinton County has joined Wayne County in asking the DoT to change from
546# the Central to the Eastern time zone.... The Wayne County government made
547# the same request in December. And while Russell County officials have not
548# taken action, the majority of respondents to a poll conducted there in
549# August indicated they would like to change to "fast time" also.
550# The three Lake Cumberland counties are the farthest east of any U.S.
551# location in the Central time zone.
552#
553# From Rich Wales (2000-08-29):
554# After prolonged debate, and despite continuing deep differences of opinion,
555# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
556# (-0500) time. They won't "fall back" this year. See Sara Shipley,
557# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
c3a08f59
A
558#
559# From Paul Eggert (2001-07-16):
560# The final rule was published in the
561# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
562# Federal Register 65, 160 (2000-08-17), page 50154-50158.
563# </a>
564#
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A
565Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00
566 -6:00 US C%sT 1946
567 -6:00 - CST 1968
568 -6:00 US C%sT 2000 Oct 29 2:00
569 -5:00 US E%sT
570
571
572# From Rives McDow (2000-08-30):
573# Here ... are all the changes in the US since 1985.
574# Kearny County, KS (put all of county on central;
575# previously split between MST and CST) ... 1990-10
576# Starke County, IN (from CST to EST) ... 1991-10
577# Oliver County, ND (from MST to CST) ... 1992-10
578# West Wendover, NV (from PST TO MST) ... 1999-10
579# Wayne County, KY (from CST to EST) ... 2000-10
b51d5b5f 580#
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A
581# From Paul Eggert (2001-07-17):
582# We don't know where the line used to be within Kearny County, KS,
583# so omit that change for now.
584# See America/Indiana/Knox for the Starke County, IN change.
585# See America/North_Dakota/Center for the Oliver County, ND change.
586# West Wendover, NV officially switched from Pacific to mountain time on
587# 1999-10-31. See the
588# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
589# Federal Register 64, 203 (1999-10-21), page 56705-56707.
590# </a>
591# However, the Federal Register says that West Wendover already operated
592# on mountain time, and the rule merely made this official;
593# hence a separate tz entry is not needed.
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A
594
595# Michigan
596#
597# From Bob Devine (1988-01-28):
598# Michigan didn't observe DST from 1968 to 1973.
599#
b51d5b5f
A
600# From Paul Eggert (1999-03-31):
601# Shanks writes that Michigan started using standard time on 1885-09-18,
602# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
603# that Detroit kept
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A
604#
605# local time until 1900 when the City Council decreed that clocks should
606# be put back twenty-eight minutes to Central Standard Time. Half the
607# city obeyed, half refused. After considerable debate, the decision
608# was rescinded and the city reverted to Sun time. A derisive offer to
609# erect a sundial in front of the city hall was referred to the
610# Committee on Sewers. Then, in 1905, Central time was adopted
611# by city vote.
612#
613# This story is too entertaining to be false, so go with Howse over Shanks.
614#
b51d5b5f
A
615# From Paul Eggert (2001-03-06):
616# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
617# one hour in 1914.'' This change is not in Shanks. We have no more
618# info, so omit this for now.
619#
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620# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
621# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
622Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
623Rule Detroit 1948 only - Sep lastSun 2:00 0 S
624Rule Detroit 1967 only - Jun 14 2:00 1:00 D
625Rule Detroit 1967 only - Oct lastSun 2:00 0 S
626# Zone NAME GMTOFF RULES FORMAT [UNTIL]
627Zone America/Detroit -5:32:11 - LMT 1905
628 -6:00 - CST 1915 May 15 2:00
629 -5:00 - EST 1942
630 -5:00 US E%sT 1946
631 -5:00 Detroit E%sT 1973
632 -5:00 US E%sT 1975
633 -5:00 - EST 1975 Apr 27 2:00
634 -5:00 US E%sT
635#
636# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
637# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
638Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
639Rule Menominee 1946 only - Sep lastSun 2:00 0 S
640Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
641Rule Menominee 1966 only - Oct lastSun 2:00 0 S
642# Zone NAME GMTOFF RULES FORMAT [UNTIL]
643Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
644 -6:00 US C%sT 1946
645 -6:00 Menominee C%sT 1969 Apr 27 2:00
646 -5:00 - EST 1973 Apr 29 2:00
647 -6:00 US C%sT
648
649# Navassa
c3a08f59 650# administered by the US Fish and Wildlife Service
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A
651# claimed by US under the provisions of the 1856 Guano Islands Act
652# also claimed by Haiti
653# occupied 1857/1900 by the Navassa Phosphate Co
c3a08f59 654# US lighthouse 1917/1996-09
b51d5b5f
A
655# currently uninhabited
656# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
657# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
658# Jimmy Skaggs, _The Great Guano Rush_ (1994).
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A
659
660# Old names, for S5 users
661
662# Link LINK-FROM LINK-TO
663Link America/New_York EST5EDT
664Link America/Chicago CST6CDT
665Link America/Denver MST7MDT
666Link America/Los_Angeles PST8PDT
667Link America/Indianapolis EST
668Link America/Phoenix MST
669Link Pacific/Honolulu HST
670
671################################################################################
672
673
b51d5b5f 674# From Paul Eggert <eggert@twinsun.com> (1999-10-29):
1815bff5 675# A good source for time zone historical data outside the US is
b51d5b5f
A
676# Thomas G. Shanks, The International Atlas (5th edition),
677# San Diego: ACS Publications, Inc. (1999).
1815bff5 678#
c3a08f59 679# Gwillim Law writes that a good source
1815bff5
A
680# for recent time zone data is the International Air Transport
681# Association's Standard Schedules Information Manual (IATA SSIM),
682# published semiannually. Law sent in several helpful summaries
683# of the IATA's data after 1990.
684#
685# Except where otherwise noted, Shanks is the source for entries through 1990,
686# and IATA SSIM is the source for entries after 1990.
687#
688# Another source occasionally used is Edward W. Whitman, World Time Differences,
689# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
690# I found in the UCLA library.
691#
692# See the `europe' file for Greenland.
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693
694# Canada
695
696# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
697# I post here the time zone abbreviations standardized in Canada
698# for both English and French in the CAN/CSA-Z234.4-89 standard....
699#
700# UTC Standard time Daylight savings time
701# offset French English French English
702# -2:30 - - HAT NDT
703# -3 - - HAA ADT
704# -3:30 HNT NST - -
705# -4 HNA AST HAE EDT
706# -5 HNE EST HAC CDT
707# -6 HNC CST HAR MDT
708# -7 HNR MST HAP PDT
709# -8 HNP PST HAY YDT
710# -9 HNY YST - -
711#
712# HN: Heure Normale ST: Standard Time
713# HA: Heure Avanc<e'>e DT: Daylight saving Time
714#
715# A: de l'Atlantique Atlantic
716# C: du Centre Central
717# E: de l'Est Eastern
718# M: Mountain
719# N: Newfoundland
720# P: du Pacifique Pacific
721# R: des Rocheuses
722# T: de Terre-Neuve
723# Y: du Yukon Yukon
724#
725# From Paul Eggert <eggert@twinsun.com> (1994-11-22):
726# Alas, this sort of thing must be handled by localization software.
727
b51d5b5f 728# Unless otherwise specified, the data for Canada are all from Shanks.
1815bff5 729
b51d5b5f
A
730# From Paul Eggert (2000-10-02):
731# H. David Matthews and Mary Vincent's map
732# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm">
733# "It's about TIME", _Canadian Geographic_ (September-October 1998)
734# </a> contains detailed boundaries for regions observing nonstandard
735# time and daylight saving time arrangements in Canada circa 1998.
736#
737# INMS, the Institute for National Measurement Standards in Ottawa, has
738# <a href="http://www.nrc.ca/inms/time/tze.html">
739# information about standard and daylight saving time zones in Canada.
740# </a> (updated periodically).
741# Its unofficial information is often taken from Matthews and Vincent.
1815bff5
A
742
743# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
744Rule Canada 1918 only - Apr 14 2:00 1:00 D
745Rule Canada 1918 only - Oct 31 2:00 0 S
b51d5b5f 746Rule Canada 1942 only - Feb 9 2:00 1:00 W
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A
747Rule Canada 1945 only - Sep 30 2:00 0 S
748Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
749Rule Canada 1974 max - Oct lastSun 2:00 0 S
750Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
751
752
b51d5b5f
A
753# Newfoundland (and far southeast Labrador)
754
755# From Paul Eggert (2000-10-02):
756# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
757# but the only part of Labrador that follows the rules is the
758# southeast corner, including Port Hope Simpson and Mary's Harbour,
759# but excluding, say, Black Tickle.
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760
761# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
762Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
763Rule StJohns 1917 only - Sep 17 2:00 0 S
764Rule StJohns 1918 only - Oct 31 2:00 0 S
765# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
766Rule StJohns 1919 only - May 5 23:00 1:00 D
767Rule StJohns 1919 only - Aug 12 23:00 0 S
768# For 1931-1935 Whitman gives Apr same date; go with Shanks.
769Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
770Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
771# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
772Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
773Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
774# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
b51d5b5f 775Rule StJohns 1942 only - Mar 1 0:00 1:00 W
1815bff5 776Rule StJohns 1942 only - Dec 31 0:00 0 S
b51d5b5f 777Rule StJohns 1943 only - May 30 0:00 1:00 W
1815bff5 778Rule StJohns 1943 only - Sep 5 0:00 0 S
b51d5b5f 779Rule StJohns 1944 only - Jul 10 0:00 1:00 W
1815bff5 780Rule StJohns 1944 only - Sep 2 0:00 0 S
b51d5b5f 781Rule StJohns 1945 only - Jan 1 0:00 1:00 W
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A
782Rule StJohns 1945 only - Oct 7 2:00 0 S
783# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
784# Apr 30 - Sep 24; go with Shanks.
785Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
786Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
787Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
788Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
b51d5b5f
A
789Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
790# From Paul Eggert (2000-10-02):
791# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
792# at 00:01 local time. For now, assume it started in 1987.
793Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
794Rule StJohns 1987 max - Oct lastSun 0:01 0 S
795Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
796Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
1815bff5
A
797# St John's has an apostrophe, but Posix file names can't have apostrophes.
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/St_Johns -3:30:52 - LMT 1884
800 -3:30:52 StJohns N%sT 1935 Mar 30
801 -3:30 StJohns N%sT
802
803
b51d5b5f 804# most of east Labrador
1815bff5
A
805
806# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
807# Zone NAME GMTOFF RULES FORMAT [UNTIL]
808Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
809 -3:30:52 StJohns NST 1919
810 -3:30:52 - NST 1935 Mar 30
811 -3:30 - NST 1936
812 -3:30 StJohns N%sT 1966 Mar 15 2:00
813 -4:00 StJohns A%sT
814
815
816# west Labrador, New Brunswick, Nova Scotia, Prince Edward I
817
818# From Paul Eggert (1996-06-12):
819# Shanks writes that since 1970 most of this region has been like Halifax.
820# Many locales did not observe peacetime DST until 1972;
821# Glace Bay, NS is the largest that we know of.
822# Shanks also writes that Liverpool, NS was the only town in Canada to observe
823# DST in 1971 but not 1970; for now we'll assume this is a typo.
824
b51d5b5f
A
825# From Paul Eggert (2000-10-02):
826# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches
827# at 00:01 local time. FIXME: verify and create a new Zone for this.
828
829
1815bff5
A
830# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
831Rule Halifax 1916 only - Apr 1 0:00 1:00 D
832Rule Halifax 1916 only - Oct 1 0:00 0 S
833Rule Halifax 1918 only - Apr 14 2:00 1:00 D
834Rule Halifax 1918 only - Oct 31 2:00 0 S
835Rule Halifax 1920 only - May 9 0:00 1:00 D
836Rule Halifax 1920 only - Aug 29 0:00 0 S
837Rule Halifax 1921 only - May 6 0:00 1:00 D
838Rule Halifax 1921 1922 - Sep 5 0:00 0 S
839Rule Halifax 1922 only - Apr 30 0:00 1:00 D
840Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
841Rule Halifax 1923 only - Sep 4 0:00 0 S
842Rule Halifax 1924 only - Sep 15 0:00 0 S
843Rule Halifax 1925 only - Sep 28 0:00 0 S
844Rule Halifax 1926 only - May 16 0:00 1:00 D
845Rule Halifax 1926 only - Sep 13 0:00 0 S
846Rule Halifax 1927 only - May 1 0:00 1:00 D
847Rule Halifax 1927 only - Sep 26 0:00 0 S
848Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
849Rule Halifax 1928 only - Sep 9 0:00 0 S
850Rule Halifax 1929 only - Sep 3 0:00 0 S
851Rule Halifax 1930 only - Sep 15 0:00 0 S
852Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
853Rule Halifax 1933 only - Apr 30 0:00 1:00 D
854Rule Halifax 1933 only - Oct 2 0:00 0 S
855Rule Halifax 1934 only - May 20 0:00 1:00 D
856Rule Halifax 1934 only - Sep 16 0:00 0 S
857Rule Halifax 1935 only - Jun 2 0:00 1:00 D
858Rule Halifax 1935 only - Sep 30 0:00 0 S
859Rule Halifax 1936 only - Jun 1 0:00 1:00 D
860Rule Halifax 1936 only - Sep 14 0:00 0 S
861Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
862Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
863Rule Halifax 1939 only - May 28 0:00 1:00 D
864Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
b51d5b5f 865Rule Halifax 1942 only - Feb 9 2:00 1:00 W
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A
866Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
867Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
868Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
869Rule Halifax 1962 max - Oct lastSun 2:00 0 S
870Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
871# Zone NAME GMTOFF RULES FORMAT [UNTIL]
872Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
873 -4:00 Halifax A%sT
874Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
875 -4:00 Canada A%sT 1953
876 -4:00 Halifax A%sT 1954
877 -4:00 - AST 1972
878 -4:00 Halifax A%sT
879
880
881# Ontario, Quebec
882
883# From Paul Eggert (1996-06-12):
884# Shanks writes that since 1970 most of this region has been like Montreal.
885# Thunder Bay skipped DST in 1973.
886# Many smaller locales did not observe peacetime DST until 1974;
887# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
888# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
889
b51d5b5f
A
890# From Paul Eggert (1997-10-17):
891# msb@sq.com writes that an article in the 1997-10-14 Toronto Star
892# says that Atikokan, Ontario currently does not observe DST,
893# but will vote on 11-10 whether to use EST/EDT.
894# He also writes that the
895# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
896# Ontario Time Act (1990, Chapter T.9)
897# </a>
898# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
899# Officially Atikokan is therefore on CST/CDT, and most likely this report
900# concerns a non-official time observed as a matter of local practice.
901# For what it's worth, Shanks says that Atikokan has agreed with
902# Rainy River ever since standard time was introduced.
903
904# From Paul Eggert (2000-10-02):
905# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
906# New Osnaburgh observe CST all year, that Big Trout Lake observes
907# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
908# violation of the official Ontario rules.
909# They also write that Quebec east of the -63 meridian is supposed to
910# observe AST, but residents as far east as Natashquan use EST/EDT,
911# and residents east of Natashquan use AST.
912# We probably need Zones for far east Quebec and for Atikokan,
913# but we don't know when their practices started.
914
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A
915# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
916Rule Mont 1917 only - Mar 25 2:00 1:00 D
917Rule Mont 1917 only - Apr 24 0:00 0 S
918Rule Mont 1918 only - Apr 14 2:00 1:00 D
919Rule Mont 1918 only - Oct 31 2:00 0 S
920Rule Mont 1919 only - Mar 31 2:30 1:00 D
921Rule Mont 1919 only - Oct 25 2:30 0 S
922Rule Mont 1920 only - May 2 2:30 1:00 D
923Rule Mont 1920 only - Oct 3 2:30 0 S
924Rule Mont 1921 only - May 1 2:00 1:00 D
925Rule Mont 1921 only - Oct 2 2:30 0 S
926Rule Mont 1922 only - Apr 30 2:00 1:00 D
927Rule Mont 1922 only - Oct 1 2:30 0 S
928Rule Mont 1924 only - May 17 2:00 1:00 D
929Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
930Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
931Rule Mont 1927 only - May 1 0:00 1:00 D
932Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
933Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
934Rule Mont 1932 only - May 1 0:00 1:00 D
935Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
936Rule Mont 1933 only - Oct 1 0:00 0 S
937Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
938Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
939Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
940Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
941Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
942Rule Mont 1957 max - Oct lastSun 2:00 0 S
943Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
944# Zone NAME GMTOFF RULES FORMAT [UNTIL]
945Zone America/Montreal -4:54:16 - LMT 1884
946 -5:00 Mont E%sT
947Zone America/Thunder_Bay -5:57:00 - LMT 1895
948 -5:00 Canada E%sT 1970
949 -5:00 Mont E%sT 1973
950 -5:00 - EST 1974
951 -5:00 Canada E%sT
952Zone America/Nipigon -5:53:04 - LMT 1895
953 -5:00 Canada E%sT
954Zone America/Rainy_River -6:17:56 - LMT 1895
955 -6:00 Canada C%sT
956
957
958# Manitoba
959
960# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
961Rule Winn 1916 only - Apr 23 0:00 1:00 D
962Rule Winn 1916 only - Sep 17 0:00 0 S
963Rule Winn 1918 only - Apr 14 2:00 1:00 D
964Rule Winn 1918 only - Oct 31 2:00 0 S
965Rule Winn 1937 only - May 16 2:00 1:00 D
966Rule Winn 1937 only - Sep 26 2:00 0 S
b51d5b5f 967Rule Winn 1942 only - Feb 9 2:00 1:00 W
1815bff5
A
968Rule Winn 1945 only - Sep lastSun 2:00 0 S
969Rule Winn 1946 only - May 12 2:00 1:00 D
970Rule Winn 1946 only - Oct 13 2:00 0 S
971Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
972Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
973Rule Winn 1950 only - May 1 2:00 1:00 D
974Rule Winn 1950 only - Sep 30 2:00 0 S
975Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
976Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
977Rule Winn 1959 only - Oct lastSun 2:00 0 S
978Rule Winn 1960 only - Sep lastSun 2:00 0 S
979Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
980Rule Winn 1963 only - Sep 22 2:00 0 S
981Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
b51d5b5f 982Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
1815bff5 983Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
b51d5b5f
A
984# From Paul Eggert (2000-10-02):
985# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
986# DST at 03:00 local time. For now, assume it started in 1987.
987Rule Winn 1987 max - Oct lastSun 2:00s 0 S
1815bff5
A
988# Zone NAME GMTOFF RULES FORMAT [UNTIL]
989Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
990 -6:00 Winn C%sT
991
992
993# Saskatchewan
994
b51d5b5f 995# From Paul Eggert (2000-10-02):
1815bff5
A
996# Shanks writes that since 1970 most of this region has been like Regina.
997# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
998# Other western towns (e.g. Lloydminster) are like Edmonton.
b51d5b5f
A
999# Matthews and Vincent (1998) write that Denare Beach and Creighton
1000# are like Winnipeg, in violation of Saskatchewan law.
1815bff5
A
1001
1002# From W. Jones <jones@skdad.usask.ca> (1992-11-06):
1003# The. . .below is based on information I got from our law library, the
1004# provincial archives, and the provincial Community Services department.
1005# A precise history would require digging through newspaper archives, and
1006# since you didn't say what you wanted, I didn't bother.
1007#
1008# Saskatchewan is split by a time zone meridian (105W) and over the years
1009# the boundary became pretty ragged as communities near it reevaluated
1010# their affiliations in one direction or the other. In 1965 a provincial
1011# referendum favoured legislating common time practices.
1012#
1013# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1014# Saskatchewan 1978) was proclaimed, and established that the eastern
1015# part of Saskatchewan would use CST year round, that districts in
1016# northwest Saskatchewan would by default follow CST but could opt to
1017# follow Mountain Time rules (thus 1 hour difference in the winter and
1018# zero in the summer), and that districts in southwest Saskatchewan would
1019# by default follow MT but could opt to follow CST.
1020#
1021# It took a few years for the dust to settle (I know one story of a town
1022# on one time zone having its school in another, such that a mom had to
1023# serve her family lunch in two shifts), but presently it seems that only
1024# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1025# rules any more; all other districts appear to have used CST year round
1026# since sometime in the 1960s.
1027
1028# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1029Rule Regina 1918 only - Apr 14 2:00 1:00 D
1030Rule Regina 1918 only - Oct 31 2:00 0 S
1031Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1032Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1033Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1034Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1035Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1036Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
b51d5b5f 1037Rule Regina 1942 only - Feb 9 2:00 1:00 W
1815bff5
A
1038Rule Regina 1945 only - Sep lastSun 2:00 0 S
1039Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1040Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1041Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
1042Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
1043Rule Regina 1959 only - Oct lastSun 2:00 0 S
1044#
1045Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1046Rule Swift 1957 only - Oct lastSun 2:00 0 S
1047Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1048Rule Swift 1959 only - Oct lastSun 2:00 0 S
1049Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1050# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1051Zone America/Regina -6:58:36 - LMT 1905 Sep
1052 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1053 -6:00 - CST
1054Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1055 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1056 -7:00 Regina M%sT 1950
1057 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1058 -6:00 - CST
1059
1060
1061# Alberta
1062
1063# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1064Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1065Rule Edm 1918 only - Oct 31 2:00 0 S
1066Rule Edm 1919 only - May 27 2:00 0 S
1067Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1068Rule Edm 1920 only - Oct lastSun 2:00 0 S
1069Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
b51d5b5f 1070Rule Edm 1942 only - Feb 9 2:00 1:00 W
1815bff5
A
1071Rule Edm 1945 only - Sep lastSun 2:00 0 S
1072Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1073Rule Edm 1947 only - Sep lastSun 2:00 0 S
1074Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1075Rule Edm 1967 only - Oct lastSun 2:00 0 S
1076Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1077Rule Edm 1969 only - Oct lastSun 2:00 0 S
1078Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1079Rule Edm 1972 max - Oct lastSun 2:00 0 S
1080Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
1081# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1082Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1083 -7:00 Edm M%sT
1084
1085
1086# British Columbia
1087
b51d5b5f 1088# From Paul Eggert (2000-10-02):
1815bff5 1089# Shanks writes that since 1970 most of this region has been like Vancouver.
b51d5b5f
A
1090# Dawson Creek uses MST. Much of east BC is like Edmonton.
1091# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1815bff5
A
1092
1093# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1094Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1095Rule Vanc 1918 only - Oct 31 2:00 0 S
b51d5b5f 1096Rule Vanc 1942 only - Feb 9 2:00 1:00 W
1815bff5
A
1097Rule Vanc 1945 only - Sep 30 2:00 0 S
1098Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1099Rule Vanc 1946 only - Oct 13 2:00 0 S
1100Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1101Rule Vanc 1962 max - Oct lastSun 2:00 0 S
1102Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
1103# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1104Zone America/Vancouver -8:12:28 - LMT 1884
1105 -8:00 Vanc P%sT
1106Zone America/Dawson_Creek -8:00:56 - LMT 1884
1107 -8:00 Canada P%sT 1947
1108 -8:00 Vanc P%sT 1972 Aug 30 2:00
1109 -7:00 - MST
1110
1111
b51d5b5f 1112# Northwest Territories, Nunavut, Yukon
1815bff5 1113
b51d5b5f 1114# From Paul Eggert (1999-10-29):
1815bff5 1115# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1815bff5
A
1116# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
1117# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1118# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1119# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1120# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1121# * O.I.C. 1980/02 established DST.
1122# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1123# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
1124
b51d5b5f
A
1125# From Rives McDow (1999-09-04):
1126# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1127# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1128# Nunavut moves to single time zone Oct. 31
1129# </a>
1130#
1131# From Antoine Leca (1999-09-06):
1132# We then need to create a new timezone for the Kitikmeot region of Nunavut
1133# to differentiate it from the Yellowknife region.
1134
1135# From Paul Eggert (1999-09-20):
1136# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1137# Basic Facts: The New Territory
c3a08f59 1138# </a> (1999) reports that Pangnirtung operates on eastern time,
b51d5b5f 1139# and that Coral Harbour does not observe DST. We don't know when
c3a08f59 1140# Pangnirtung switched to eastern time; we'll guess 1995.
b51d5b5f
A
1141# We'll ignore the claim about Coral Harbour for now,
1142# since we have no further info.
1143
1144# From Rives McDow (1999-11-08):
1145# On October 31, when the rest of Nunavut went to Central time,
1146# Pangnirtung wobbled. Here is the result of their wobble:
1147#
1148# The following businesses and organizations in Pangnirtung use Central Time:
1149#
1150# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1151# Eastern Arctic National Parks, A & D Specialist
1152#
1153# The following businesses and organizations in Pangnirtung use Eastern Time:
1154#
1155# Hamlet office, All other businesses, Both schools, Airport operator
1156#
1157# This has made for an interesting situation there, which warranted the news.
1158# No one there that I spoke with seems concerned, or has plans to
1159# change the local methods of keeping time, as it evidently does not
1160# really interfere with any activities or make things difficult locally.
1161# They plan to celebrate New Year's turn-over twice, one hour apart,
1162# so it appears that the situation will last at least that long.
1163# The Nunavut Intergovernmental Affairs hopes that they will "come to
1164# their senses", but the locals evidently don't see any problem with
1165# the current state of affairs.
1166
1167# From Michaela Rodrigue, writing in the
1168# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1169# Nunatsiaq News (1999-11-19)</a>:
1170# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1171# central - or Nunavut time - for government offices, and eastern time
1172# for municipal offices and schools.... Igloolik [was similar but then]
1173# made the switch to central time on Saturday, Nov. 6.
1174
1175# From Paul Eggert (2000-10-02):
1176# Matthews and Vincent (1998) say the following, but we lack histories
1177# for these potential new Zones.
1178#
1179# The Canadian Forces station at Alert uses Eastern Time while the
1180# handful of residents at the Eureka weather station [in the Central
1181# zone] skip daylight savings. Baffin Island, which is crossed by the
1182# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1183# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1184# Central Time and Southampton Island [in the Central zone] is not
1185# required to use daylight savings.
1186
1187# From
1188# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1189# Nunavut now has two time zones
1190# </a> (2000-11-10):
1191# The Nunavut government would allow its employees in Kugluktuk and
1192# Cambridge Bay to operate on central time year-round, putting them
1193# one hour behind the rest of Nunavut for six months during the winter.
1194# At the end of October the two communities had rebelled against
1195# Nunavut's unified time zone, refusing to shift to eastern time with
1196# the rest of the territory for the winter. Cambridge Bay remained on
1197# central time, while Kugluktuk, even farther west, reverted to
1198# mountain time, which they had used before the advent of Nunavut's
1199# unified time zone in 1999.
1200#
1201# From Rives McDow (2001-01-20), quoting the Nunavut government:
1202# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1203
1204# From Paul Eggert (2000-12-04):
1205# Let's just keep track of the official times for now.
1206
1207# From Rives McDow (2001-03-07):
1208# The premier of Nunavut has issued a ministerial statement advising
1209# that effective 2001-04-01, the territory of Nunavut will revert
1210# back to three time zones (mountain, central, and eastern). Of the
1211# cities in Nunavut, Coral Harbor is the only one that I know of that
1212# has said it will not observe dst, staying on EST year round. I'm
1213# checking for more info, and will get back to you if I come up with
1214# more.
1215# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1216
1815bff5
A
1217# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1218Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1219Rule NT_YK 1918 only - Oct 27 2:00 0 S
1220Rule NT_YK 1919 only - May 25 2:00 1:00 D
1221Rule NT_YK 1919 only - Nov 1 0:00 0 S
b51d5b5f 1222Rule NT_YK 1942 only - Feb 9 2:00 1:00 W
1815bff5
A
1223Rule NT_YK 1945 only - Sep 30 2:00 0 S
1224Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1225Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1226Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1227Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
1228Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
1229# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1230Zone America/Pangnirtung -4:22:56 - LMT 1884
b51d5b5f
A
1231 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1232 -5:00 Canada E%sT 1999 Oct 31 2:00
1233 -6:00 Canada C%sT 2000 Oct 29 2:00
1234 -5:00 Canada E%sT
1235Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
1236 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1237 -6:00 Canada C%sT 2000 Oct 29 2:00
1238 -5:00 Canada E%sT
1815bff5 1239Zone America/Rankin_Inlet -6:08:40 - LMT 1884
b51d5b5f
A
1240 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1241 -5:00 - EST 2001 Apr 1 3:00
1242 -6:00 Canada C%sT
1243Zone America/Cambridge_Bay -7:00:20 - LMT 1884
1244 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1245 -6:00 Canada C%sT 2000 Oct 29 2:00
1246 -5:00 - EST 2000 Nov 5 0:00
1247 -6:00 - CST 2001 Apr 1 3:00
1248 -7:00 Canada M%sT
1815bff5
A
1249Zone America/Yellowknife -7:37:24 - LMT 1884
1250 -7:00 NT_YK M%sT
1251Zone America/Inuvik -8:54:00 - LMT 1884
1252 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1253 -7:00 NT_YK M%sT
1254Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1255 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1256 -8:00 NT_YK P%sT
1257Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1258 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1259 -8:00 NT_YK P%sT
1260
1261
1262###############################################################################
1263
1264# Mexico
1265
b51d5b5f
A
1266# From Paul Eggert (2001-03-05):
1267# The Investigation and Analysis Service of the
1268# Mexican Library of Congress (MLoC) has published a
1269# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1270# history of Mexican local time (in Spanish)
1271# </a>.
1815bff5 1272#
b51d5b5f
A
1273# Here are the discrepancies between Shanks and the MLoC.
1274# (In all cases we go with the MLoC.)
1275# Shanks reports that Baja was at -8:00 in 1922/1923.
1276# Shanks says the 1930 transition in Baja was 1930-11-16.
1277# Shanks reports no DST during summer 1931.
1278# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01.
1279# Shanks does not report transitions for Baja in 1945 or 1948.
1280# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23.
1281# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00
1282# on 1997-10-26 at 02:00.
1283
1284# From Gwillim Law (2001-02-20):
1285# There are some other discrepancies between the Decrees page and the
1286# tz database. I think they can best be explained by supposing that
1287# the researchers who prepared the Decrees page failed to find some of
1288# the relevant documents.
1289
1290# From Paul Eggert (2000-07-26):
1291# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1292# and 1988 DST experiments. Go with spin.com.mx.
1815bff5
A
1293
1294# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1295# A guy from our Mexico subsidiary finally found the Presidential Decree
1296# outlining the timezone changes in Mexico.
b51d5b5f 1297#
1815bff5 1298# ------------- Begin Forwarded Message -------------
b51d5b5f 1299#
1815bff5
A
1300# I finally got my hands on the Official Presidential Decree that sets up the
1301# rules for the DST changes. The rules are:
b51d5b5f 1302#
1815bff5
A
1303# 1. The country is divided in 3 timezones:
1304# - Baja California Norte (the Mexico/BajaNorte TZ)
1305# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1306# - The rest of the country (the Mexico/General TZ)
b51d5b5f 1307#
1815bff5
A
1308# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1309# at 2:00 AM, the times in each zone are as follows:
1310# BajaNorte: GMT+7
1311# BajaSur: GMT+6
1312# General: GMT+5
b51d5b5f 1313#
1815bff5
A
1314# 3. The rest of the year, the times are as follows:
1315# BajaNorte: GMT+8
1316# BajaSur: GMT+7
1317# General: GMT+6
b51d5b5f 1318#
1815bff5 1319# The Decree was published in Mexico's Official Newspaper on January 4th.
b51d5b5f 1320#
1815bff5
A
1321# -------------- End Forwarded Message --------------
1322# From Paul Eggert (1996-06-12):
b51d5b5f
A
1323# For an English translation of the decree, see
1324# <a href="http://mexico-travel.com/extra/timezone_eng.html">
1325# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1326# </a>
1327
1328# From Rives McDow (1998-10-08):
1329# The State of Quintana Roo has reverted back to central STD and DST times
1330# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1331
1332# From Rives McDow (2000-01-10):
1333# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1334# zone 5 hours from the International Date Line, and will not observe daylight
1335# savings time so as to stay on the same time zone as the southern part of
1336# Arizona year round.
1337
1338# From Jesper Norgaard, translating
1339# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1340# In Oaxaca, the 55.000 teachers from the Section 22 of the National
1341# Syndicate of Education Workers, refuse to apply daylight saving each
1342# year, so that the more than 10,000 schools work at normal hour the
1343# whole year.
1344
1345# From Gwillim Law (2001-01-19):
1346# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1347# (translated):...
1348# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1349# that Summer Time will be reduced from seven to five months, starting
1350# this year....
1351# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1352# [translated], says "summer time will ... take effect on the first Sunday
1353# in May, and end on the last Sunday of September.
1354
1355# From Arthur David Olson (2001-01-25):
1356# The 2001-01-24 traditional Washington Post contained the page one
1357# story "Timely Issue Divides Mexicans."...
1358# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1359# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1360# Mexico City and its 20 million residents on a different time than
1361# the rest of the country..." In particular, Lopez Obrador would abolish
1362# observation of Daylight Saving Time.
1363
1364# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1365# Official statute published by the Energy Department
1366# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1367# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1368
1369# From Paul Eggert (2001-03-03):
1370#
1371# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1372# James F. Smith writes in today's LA Times
1373# </a>
1374# * Sonora will continue to observe standard time.
1375# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1376# the Federal District will not adopt DST.
1377# * 4 of 16 district leaders announced they'll ignore the decree.
1378# * The decree does not affect federal-controlled facilities including
1379# the airport, banks, hospitals, and schools.
1380#
1381# For now we'll assume that the Federal District will bow to federal rules.
1382
1383# From Jesper Norgaard (2001-04-01):
1384# I found some references to the Mexican application of daylight
1385# saving, which modifies what I had already sent you, stating earlier
1386# that a number of northern Mexican states would go on daylight
1387# saving. The modification reverts this to only cover Baja California
1388# (Norte), while all other states (except Sonora, who has no daylight
1389# saving all year) will follow the original decree of president
1390# Vicente Fox, starting daylight saving May 6, 2001 and ending
1391# September 30, 2001.
1392# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1393# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1815bff5 1394
c3a08f59
A
1395# From Reuters (2001-09-04):
1396# Mexico's Supreme Court on Tuesday declared that daylight savings was
1397# unconstitutional in Mexico City, creating the possibility the
1398# capital will be in a different time zone from the rest of the nation
1399# next year.... The Supreme Court's ruling takes effect at 2:00
1400# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1401# standard time. "This is so residents of the Federal District are not
1402# subject to unexpected time changes," a statement from the court said.
1403
1404# From Jesper Norgaard Welen (2002-03-12):
1405# ... consulting my local grocery store(!) and my coworkers, they all insisted
1406# that a new decision had been made to reinstate US style DST in Mexico....
1407# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1408# confirms this. Sonora as usual is the only state where DST is not applied.
1409
1815bff5
A
1410# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1411Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1412Rule Mexico 1939 only - Jun 25 0:00 0 S
1413Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1414Rule Mexico 1941 only - Apr 1 0:00 0 S
b51d5b5f 1415Rule Mexico 1943 only - Dec 16 0:00 1:00 W
1815bff5
A
1416Rule Mexico 1944 only - May 1 0:00 0 S
1417Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1418Rule Mexico 1950 only - Jul 30 0:00 0 S
b51d5b5f
A
1419Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1420Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
c3a08f59
A
1421Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1422Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1423Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1424Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1815bff5 1425# Zone NAME GMTOFF RULES FORMAT [UNTIL]
b51d5b5f
A
1426# Quintana Roo
1427Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1428 -6:00 - CST 1981 Dec 23
1429 -5:00 Mexico E%sT 1998 Aug 2 2:00
1430 -6:00 Mexico C%sT
1431# Campeche, Yucatan
1432Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1433 -6:00 - CST 1981 Dec 23
1434 -5:00 - EST 1982 Dec 2
1435 -6:00 Mexico C%sT
1436# Coahuila, Durango, Nuevo Leon, Tamaulipas
1437Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1438 -6:00 - CST 1988
1439 -6:00 US C%sT 1989
1440 -6:00 Mexico C%sT
1441# Central Mexico
1815bff5
A
1442Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1443 -7:00 - MST 1927 Jun 10 23:00
1444 -6:00 - CST 1930 Nov 15
1445 -7:00 - MST 1931 May 1 23:00
1446 -6:00 - CST 1931 Oct
b51d5b5f 1447 -7:00 - MST 1932 Apr 1
c3a08f59
A
1448 -6:00 Mexico C%sT 2001 Sep 30 02:00
1449 -6:00 - CST 2002 Feb 20
1815bff5 1450 -6:00 Mexico C%sT
b51d5b5f
A
1451# Chihuahua
1452Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1453 -7:00 - MST 1927 Jun 10 23:00
1454 -6:00 - CST 1930 Nov 15
1455 -7:00 - MST 1931 May 1 23:00
1456 -6:00 - CST 1931 Oct
1457 -7:00 - MST 1932 Apr 1
1458 -6:00 - CST 1996
1459 -6:00 Mexico C%sT 1998
1460 -6:00 - CST 1998 Apr Sun>=1 3:00
1461 -7:00 Mexico M%sT
1462# Sonora
1463Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1464 -7:00 - MST 1927 Jun 10 23:00
1465 -6:00 - CST 1930 Nov 15
1466 -7:00 - MST 1931 May 1 23:00
1467 -6:00 - CST 1931 Oct
1468 -7:00 - MST 1932 Apr 1
1469 -6:00 - CST 1942 Apr 24
1470 -7:00 - MST 1949 Jan 14
1471 -8:00 - PST 1970
1472 -7:00 Mexico M%sT 1999
1473 -7:00 - MST
1474# Baja California Sur, Nayarit, Sinaloa
1815bff5
A
1475Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1476 -7:00 - MST 1927 Jun 10 23:00
1477 -6:00 - CST 1930 Nov 15
1478 -7:00 - MST 1931 May 1 23:00
1479 -6:00 - CST 1931 Oct
b51d5b5f
A
1480 -7:00 - MST 1932 Apr 1
1481 -6:00 - CST 1942 Apr 24
1815bff5
A
1482 -7:00 - MST 1949 Jan 14
1483 -8:00 - PST 1970
1484 -7:00 Mexico M%sT
b51d5b5f 1485# Baja California
1815bff5 1486Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
b51d5b5f 1487 -7:00 - MST 1924
1815bff5 1488 -8:00 - PST 1927 Jun 10 23:00
b51d5b5f
A
1489 -7:00 - MST 1930 Nov 15
1490 -8:00 - PST 1931 Apr 1
1491 -8:00 1:00 PDT 1931 Sep 30
1492 -8:00 - PST 1942 Apr 24
1493 -8:00 1:00 PWT 1945 Nov 12
1494 -8:00 - PST 1948 Apr 5
1495 -8:00 1:00 PDT 1949 Jan 14
1496 -8:00 - PST 1954
1497 -8:00 CA P%sT 1961
1498 -8:00 - PST 1976
1815bff5 1499 -8:00 US P%sT 1996
b51d5b5f 1500 -8:00 Mexico P%sT 2001
c3a08f59
A
1501 -8:00 US P%sT 2002 Feb 20
1502 -8:00 Mexico P%sT
b51d5b5f
A
1503# From Paul Eggert (2001-03-05):
1504# Formerly there was an America/Ensenada zone, which differed from
1505# America/Tijuana only in that it did not observe DST from 1976
1506# through 1995. This was as per Shanks. However, Guy Harris reports
1507# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
1508# Tijuana observe DST," which contradicts Shanks but does imply that
1509# DST-observance was a town-by-town matter back then. This concerns
1510# data after 1970 so most likely there should be at least one Zone
1511# other than America/Tijuana for Baja, but it's not clear yet what its
1512# name or contents should be.
1815bff5
A
1513#
1514# Revillagigedo Is
1515# no information
1516
1517###############################################################################
1518
1519# Anguilla
1520# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1521Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1522 -4:00 - AST
1523
1524# Antigua and Barbuda
1525# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1526Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1527 -5:00 - EST 1951
1528 -4:00 - AST
1529
1530# Bahamas
1531# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1532Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1533Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1534Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1536Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1537 -5:00 Bahamas E%sT
1538
1539# Barbados
1540# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1541Rule Barb 1977 only - Jun 12 2:00 1:00 D
1542Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1543Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1544Rule Barb 1979 only - Sep 30 2:00 0 S
1545Rule Barb 1980 only - Sep 25 2:00 0 S
1546# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1547Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
b51d5b5f 1548 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1815bff5
A
1549 -4:00 Barb A%sT
1550
1551# Belize
1552# Whitman entirely disagrees with Shanks; go with Shanks.
1553# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1554Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1555Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1556Rule Belize 1973 only - Dec 5 0:00 1:00 D
1557Rule Belize 1974 only - Feb 9 0:00 0 S
1558Rule Belize 1982 only - Dec 18 0:00 1:00 D
1559Rule Belize 1983 only - Feb 12 0:00 0 S
1560# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1561Zone America/Belize -5:52:48 - LMT 1912 Apr
1562 -6:00 Belize C%sT
1563
1564# Bermuda
1565# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1566Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1567 -4:00 - AST 1974 Apr 28 2:00
1568 -4:00 Bahamas A%sT
1569
1570# Cayman Is
1571# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1572Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
b51d5b5f 1573 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1815bff5
A
1574 -5:00 - EST
1575
1815bff5 1576# Costa Rica
1815bff5
A
1577# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1578Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1579Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1580Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1581# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1582Rule CR 1991 only - Jul 1 0:00 0 S
1583Rule CR 1992 only - Mar 15 0:00 0 S
1584# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1585# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1586Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
b51d5b5f 1587 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1815bff5
A
1588 -6:00 CR C%sT
1589# Coco
1590# no information; probably like America/Costa_Rica
1591
1592# Cuba
1593
b51d5b5f
A
1594# From Arthur David Olson (1999-03-29):
1595# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1596# the Cuban National Team and the Baltimore Orioles was carried live on
1597# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1598# During the game, play-by-play announcer Jim Hunter noted that
1599# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1600# Time today." (The "two hour" remark referred to losing one hour of
1601# sleep on 1999-03-28--when the announcers were in Cuba as it switched
1602# to DST--and one more hour on 1999-04-04--when the announcers will have
1603# returned to Baltimore, which switches on that date.)
1815bff5 1604
1815bff5
A
1605# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1606Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1607Rule Cuba 1928 only - Oct 10 0:00 0 S
1608Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1609Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1610Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1611Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1612Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1613Rule Cuba 1965 only - Sep 30 0:00 0 S
1614Rule Cuba 1966 only - May 29 0:00 1:00 D
1615Rule Cuba 1966 only - Oct 2 0:00 0 S
1616Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1617Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1618Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1619Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1620Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1621Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1622Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1623Rule Cuba 1978 only - May 7 0:00 1:00 D
b51d5b5f 1624Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1815bff5
A
1625Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1626Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1815bff5 1627Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
b51d5b5f 1628Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1815bff5 1629Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
b51d5b5f
A
1630Rule Cuba 1996 only - Oct 6 0:00s 0 S
1631Rule Cuba 1997 only - Oct 12 0:00s 0 S
1632Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1633Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1634Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1815bff5
A
1635
1636# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1637Zone America/Havana -5:29:28 - LMT 1890
b51d5b5f 1638 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1815bff5
A
1639 -5:00 Cuba C%sT
1640
1641# Dominica
1642# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1643Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1644 -4:00 - AST
1645
1646# Dominican Republic
b51d5b5f
A
1647
1648# From Steffen Thorsen (2000-10-30):
1649# Enrique Morales reported to me that the Dominican Republic has changed the
1650# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
1651# http://www.listin.com.do/antes/261000/republica/princi.html
1652
1653# From Paul Eggert (2000-12-04):
1654# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
1655
1656# From Rives McDow (2000-12-01):
1657# Dominican Republic changed its mind and presidential decree on Tuesday,
1658# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
1659# Dominican Republic will be reverting to 8 hours from the International Date
1660# Line, and will not be using DST in the foreseeable future. The reason they
1661# decided to use DST was to be in synch with Puerto Rico, who was also going
1662# to implement DST. When Puerto Rico didn't implement DST, the president
1663# decided to revert.
1664
1665
1815bff5
A
1666# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1667Rule DR 1966 only - Oct 30 0:00 1:00 D
1668Rule DR 1967 only - Feb 28 0:00 0 S
1669Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1670Rule DR 1970 only - Feb 21 0:00 0 S
1671Rule DR 1971 only - Jan 20 0:00 0 S
1672Rule DR 1972 1974 - Jan 21 0:00 0 S
1673# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1674Zone America/Santo_Domingo -4:39:36 - LMT 1890
1675 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1676 -5:00 DR E%sT 1974 Oct 27
b51d5b5f
A
1677 -4:00 - AST 2000 Oct 29 02:00
1678 -5:00 US E%sT 2000 Dec 3 01:00
1815bff5
A
1679 -4:00 - AST
1680
1681# El Salvador
1682# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1683Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1684Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1685# There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1686# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1687Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1688 -6:00 Salv C%sT
1689
1690# Grenada
1691# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1692Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1693 -4:00 - AST
1694
1695# Guadeloupe
1696# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1697Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1698 -4:00 - AST
1699
1700# Guatemala
1701# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1702Rule Guat 1973 only - Nov 25 0:00 1:00 D
1703Rule Guat 1974 only - Feb 24 0:00 0 S
1704Rule Guat 1983 only - May 21 0:00 1:00 D
1705Rule Guat 1983 only - Sep 22 0:00 0 S
1706Rule Guat 1991 only - Mar 23 0:00 1:00 D
1707Rule Guat 1991 only - Sep 7 0:00 0 S
1708# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1709Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1710 -6:00 Guat C%sT
1711
1712# Haiti
1713# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1714Rule Haiti 1983 only - May 8 0:00 1:00 D
1715Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1716Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
b51d5b5f
A
1717# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
1718Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1719Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1815bff5
A
1720# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1721Zone America/Port-au-Prince -4:49:20 - LMT 1890
1722 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1723 -5:00 Haiti E%sT
1724
1725# Honduras
1726# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1727# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1728Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1729 -6:00 Salv C%sT
b51d5b5f
A
1730#
1731# Great Swan I ceded by US to Honduras in 1972
1815bff5
A
1732
1733# Jamaica
1734
1735# From Bob Devine (1988-01-28):
1736# Follows US rules.
1737
1738# From U. S. Naval Observatory (1989-01-19):
1739# JAMAICA 5 H BEHIND UTC
1740
b51d5b5f 1741# From Shanks:
1815bff5
A
1742# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1743Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
b51d5b5f
A
1744 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1745 -5:00 - EST 1974 Apr 28 2:00
1815bff5
A
1746 -5:00 US E%sT 1984
1747 -5:00 - EST
1748
1749# Martinique
1750# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1751Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
c3a08f59 1752 -4:04:20 - FFMT 1911 May # Fort-de-France MT
1815bff5
A
1753 -4:00 - AST 1980 Apr 6
1754 -4:00 1:00 ADT 1980 Sep 28
1755 -4:00 - AST
1756
1757# Montserrat
b51d5b5f
A
1758# From Paul Eggert (1997-08-31):
1759# Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1760# Luckily, Olveston, the current de facto capital, has the same longitude.
1815bff5 1761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
b51d5b5f 1762Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1815bff5
A
1763 -4:00 - AST
1764
1765# Nicaragua
b51d5b5f
A
1766#
1767# From Steffen Thorsen (1998-12-29):
1768# Nicaragua seems to be back at -6:00 but I have not been able to find when
1769# they changed from -5:00.
1770#
1815bff5
A
1771# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1772Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1773Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1774Rule Nic 1992 only - Jan 1 4:00 1:00 D
1775Rule Nic 1992 only - Sep 24 0:00 0 S
1776# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1777Zone America/Managua -5:45:08 - LMT 1890
c3a08f59 1778 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
1815bff5
A
1779 -6:00 - CST 1973 May
1780 -5:00 - EST 1975 Feb 16
1781 -6:00 Nic C%sT 1993 Jan 1 4:00
b51d5b5f
A
1782 -5:00 - EST 1998 Dec
1783 -6:00 - CST
1815bff5
A
1784
1785# Panama
1786# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1787Zone America/Panama -5:18:08 - LMT 1890
c3a08f59 1788 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
1815bff5
A
1789 -5:00 - EST
1790
1791# Puerto Rico
1792# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1793# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1794Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1795 -4:00 - AST 1942 May 3
1796 -4:00 1:00 AWT 1945 Sep 30 2:00
1797 -4:00 - AST
1798
1799# St Kitts-Nevis
1800# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1801Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1802 -4:00 - AST
1803
1804# St Lucia
1805# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1806Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
c3a08f59 1807 -4:04:00 - CMT 1912 # Castries Mean Time
1815bff5
A
1808 -4:00 - AST
1809
1810# St Pierre and Miquelon
1811# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1812# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1813Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1814 -4:00 - AST 1980 May
1815 -3:00 Mont PM%sT # Pierre & Miquelon Time
1816
1817# St Vincent and the Grenadines
1818# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1819Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
b51d5b5f 1820 -4:04:56 - KMT 1912 # Kingstown Mean Time
1815bff5
A
1821 -4:00 - AST
1822
1823# Turks and Caicos
b51d5b5f
A
1824# From Paul Eggert (1998-08-06):
1825# Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1815bff5
A
1826# says they switch at midnight. Go with IATA SSIM.
1827# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1828Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1829Rule TC 1979 max - Oct lastSun 0:00 0 S
1830Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1831# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1832Zone America/Grand_Turk -4:44:32 - LMT 1890
b51d5b5f 1833 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1815bff5
A
1834 -5:00 TC E%sT
1835
1836# British Virgin Is
1837# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1838Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1839 -4:00 - AST
1840
1841# Virgin Is
1842# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1843Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1844 -4:00 - AST