Deleted Added
full compact
northamerica (181418) northamerica (181421)
1# @(#)northamerica 8.23
1# @(#)northamerica 8.24
2# <pre>
3
4# also includes Central America and the Caribbean
5
6# This data is by no means authoritative; if you think you know better,
7# go ahead and edit the file (and please send any changes to
8# tz@elsie.nci.nih.gov for general use in the future).
9
10# From Paul Eggert (1999-03-22):
11# A reliable and entertaining source about time zones is
12# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
13
14###############################################################################
15
16# United States
17
18# From Paul Eggert (1999-03-31):
19# Howse writes (pp 121-125) that time zones were invented by
20# Professor Charles Ferdinand Dowd (1825-1904),
21# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
22# His pamphlet ``A System of National Time for Railroads'' (1870)
23# was the result of his proposals at the Convention of Railroad Trunk Lines
24# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
25# but in 1872-05 he moved the proposed origin to Greenwich.
26# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
27# and the most of the country soon followed suit.
28
29# From Paul Eggert (2005-04-16):
30# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
31# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
32
33# From Paul Eggert (2006-03-22):
34# A good source for time zone historical data in the US is
35# Thomas G. Shanks, The American Atlas (5th edition),
36# San Diego: ACS Publications, Inc. (1991).
37# Make sure you have the errata sheet; the book is somewhat useless without it.
38# It is the source for most of the pre-1991 US entries below.
39
40# From Paul Eggert (2001-03-06):
41# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
42# in his whimsical essay ``An Economical Project for Diminishing the Cost
43# of Light'' published in the Journal de Paris (1784-04-26).
44# Not everyone is happy with the results:
45#
46# I don't really care how time is reckoned so long as there is some
47# agreement about it, but I object to being told that I am saving
48# daylight when my reason tells me that I am doing nothing of the kind.
49# I even object to the implication that I am wasting something
50# valuable if I stay in bed after the sun has risen. As an admirer
51# of moonlight I resent the bossy insistence of those who want to
52# reduce my time for enjoying it. At the back of the Daylight Saving
53# scheme I detect the bony, blue-fingered hand of Puritanism, eager
54# to push people into bed earlier, and get them up earlier, to make
55# them healthy, wealthy and wise in spite of themselves.
56#
57# -- Robertson Davies, The diary of Samuel Marchbanks,
58# Clarke, Irwin (1947), XIX, Sunday
59#
60# For more about the first ten years of DST in the United States, see
61# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
62# Ten years of daylight saving from the Pittsburgh standpoint
63# (Carnegie Library of Pittsburgh, 1927)</a>.
64#
65# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
66# However, DST was imposed by the Standard Time Act of 1918, which
67# was the first nationwide legal time standard, and apparently
68# time was just called "Standard Time" or "Daylight Saving Time".
69
70# From Arthur David Olson:
71# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
72# See, for example, the front page of the Saturday, 1974-10-26
73# and Sunday, 1974-10-27 editions of the Washington Post.
74
75# From Arthur David Olson:
76# Before the Uniform Time Act of 1966 took effect in 1967, observance of
77# Daylight Saving Time in the US was by local option, except during wartime.
78
79# From Arthur David Olson (2000-09-25):
80# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
81# In the introduction, Oboler spoke of "Eastern Peace Time."
82# An AltaVista search turned up
83# <a href="http://rowayton.org/rhs/hstaug45.html">:
84# "When the time is announced over the radio now, it is 'Eastern Peace
85# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
86# </a> (August 1945) by way of confirmation.
87
88# From Joseph Gallant citing
89# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
90# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
91# to switch to London for Attlee's address, but the American people
92# never got to hear his speech live. According to one press account,
93# CBS' Bob Trout was first to announce the word of Japan's surrender,
94# but a few seconds later, NBC, ABC and Mutual also flashed the word
95# of surrender, all of whom interrupting the bells of Big Ben in
96# London which were to precede Mr. Attlee's speech.
97
98# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
99# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
100#
101# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
102# Any announcement from Asia would reach St. John's New York newsroom on a
103# wire service teletype machine, which had prescribed signals for major news.
104# Associated Press, for example, would ring five bells before spewing out
105# typed copy of an important story, and 10 bells for news "of transcendental
106# importance."
107#
108# On Aug. 14, stalling while talking steadily into the NBC networks' open
109# microphone, St. John heard five bells and waited only to hear a sixth bell,
110# before announcing confidently: "Ladies and gentlemen, World War II is over.
111# The Japanese have agreed to our surrender terms."
112#
113# He had scored a 20-second scoop on other broadcasters.
114
115# From Arthur David Olson (2005-08-22):
116# Paul has been careful to use the "US" rules only in those locations
117# that are part of the United States; this reflects the real scope of
118# U.S. government action. So even though the "US" rules have changed
119# in the latest release, other countries won't be affected.
120
121# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
122Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
123Rule US 1918 1919 - Oct lastSun 2:00 0 S
124Rule US 1942 only - Feb 9 2:00 1:00 W # War
125Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
126Rule US 1945 only - Sep 30 2:00 0 S
127Rule US 1967 2006 - Oct lastSun 2:00 0 S
128Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
129Rule US 1974 only - Jan 6 2:00 1:00 D
130Rule US 1975 only - Feb 23 2:00 1:00 D
131Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
132Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
133Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
134Rule US 2007 max - Nov Sun>=1 2:00 0 S
135
136# From Arthur David Olson, 2005-12-19
137# We generate the files specified below to guard against old files with
138# obsolete information being left in the time zone binary directory.
139# We limit the list to names that have appeared in previous versions of
140# this time zone package.
141# We do these as separate Zones rather than as Links to avoid problems if
142# a particular place changes whether it observes DST.
143# We put these specifications here in the northamerica file both to
144# increase the chances that they'll actually get compiled and to
145# avoid the need to duplicate the US rules in another file.
146
147# Zone NAME GMTOFF RULES FORMAT [UNTIL]
148Zone EST -5:00 - EST
149Zone MST -7:00 - MST
150Zone HST -10:00 - HST
151Zone EST5EDT -5:00 US E%sT
152Zone CST6CDT -6:00 US C%sT
153Zone MST7MDT -7:00 US M%sT
154Zone PST8PDT -8:00 US P%sT
155
156# From Bob Devine (1988-01-28):
157# ...Alaska (and Hawaii) had the timezone names changed in 1967.
158# old new
159# Pacific Standard Time(PST) -same-
160# Yukon Standard Time(YST) -same-
161# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
162# Nome Standard Time (NT) Bering Standard Time (BST)
163#
164# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
165# The YST zone now covers nearly all of the state, AHST just part
166# of the Aleutian islands. No DST.
167
168# From Paul Eggert (1995-12-19):
169# The tables below use `NST', not `NT', for Nome Standard Time.
170# I invented `CAWT' for Central Alaska War Time.
171
172# From U. S. Naval Observatory (1989-01-19):
173# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
174# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
175# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
176# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
177# USA MOUNTAIN 7 H BEHIND UTC DENVER
178# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
179# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
180# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
181# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
182# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
183# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
184# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
185# USA HAWAII 10 H BEHIND UTC
186# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
187
188# From Arthur David Olson (1989-01-21):
189# The above dates are for 1988.
190# Note the "AKST" and "AKDT" abbreviations, the claim that there's
191# no DST in Samoa, and the claim that there is DST in Alaska and the
192# Aleutians.
193
194# From Arthur David Olson (1988-02-13):
195# Legal standard time zone names, from United States Code (1982 Edition and
196# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
197# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
198# took effect), as explained in sections 263 and 261:
199# (none)
200# United States standard eastern time
201# United States standard mountain time
202# United States standard central time
203# United States standard Pacific time
204# (none)
205# United States standard Alaska time
206# (none)
207# Next, names from 1967-04-01 until 1983-11-30 (the date for
208# public law 98-181):
209# Atlantic standard time
210# eastern standard time
211# central standard time
212# mountain standard time
213# Pacific standard time
214# Yukon standard time
215# Alaska-Hawaii standard time
216# Bering standard time
217# And after 1983-11-30:
218# Atlantic standard time
219# eastern standard time
220# central standard time
221# mountain standard time
222# Pacific standard time
223# Alaska standard time
224# Hawaii-Aleutian standard time
225# Samoa standard time
226# The law doesn't give abbreviations.
227#
228# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
229# Public law 106-564 (2000-12-23) introduced the abbreviation
230# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
231# See the file "australasia".
232
233# From Arthur David Olson, 2005-08-09
234# The following was signed into law on 2005-08-08.
235#
236# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
237# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
238# U.S.C. 260a(a)) is amended--
239# (1) by striking `first Sunday of April' and inserting `second
240# Sunday of March'; and
241# (2) by striking `last Sunday of October' and inserting `first
242# Sunday of November'.
243# (b) Effective Date- Subsection (a) shall take effect 1 year after the
244# date of enactment of this Act or March 1, 2007, whichever is later.
245# (c) Report to Congress- Not later than 9 months after the effective
246# date stated in subsection (b), the Secretary shall report to Congress
247# on the impact of this section on energy consumption in the United
248# States.
249# (d) Right to Revert- Congress retains the right to revert the
250# Daylight Saving Time back to the 2005 time schedules once the
251# Department study is complete.
252
253# US eastern time, represented by New York
254
255# Connecticut, Delaware, District of Columbia, most of Florida,
256# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
257# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
258# New Hampshire, New Jersey, New York, North Carolina, Ohio,
259# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
260# Vermont, Virginia, West Virginia
261
262# From Dave Cantor (2004-11-02):
263# Early this summer I had the occasion to visit the Mount Washington
264# Observatory weather station atop (of course!) Mount Washington [, NH]....
265# One of the staff members said that the station was on Eastern Standard Time
266# and didn't change their clocks for Daylight Saving ... so that their
267# reports will always have times which are 5 hours behind UTC.
268
269# From Paul Eggert (2005-08-26):
270# According to today's Huntsville Times
271# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1>
272# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
273# in Russell County, Lanett in Chambers County and some towns in Lee County,
274# set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
275# Roberts, city administrator in Phenix City. as saying "We are in the Central
276# time zone, but we do go by the Eastern time zone because so many people work
277# in Columbus."
278
279# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
280Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
281Rule NYC 1920 only - Oct lastSun 2:00 0 S
282Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
283Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
284Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
285# Zone NAME GMTOFF RULES FORMAT [UNTIL]
286Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
287 -5:00 US E%sT 1920
288 -5:00 NYC E%sT 1942
289 -5:00 US E%sT 1946
290 -5:00 NYC E%sT 1967
291 -5:00 US E%sT
292
293# US central time, represented by Chicago
294
295# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
296# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
297# Washington counties), Illinois, western Indiana
298# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
299# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
300# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
301# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
302# western Tennessee, most of Texas, Wisconsin
303
304# From Larry M. Smith (2006-04-26) re Wisconsin:
305# http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
306# is currently enforced at the 01:00 time of change. Because the local
307# "bar time" in the state corresponds to 02:00, a number of citations
308# are issued for the "sale of class 'B' alcohol after prohibited
309# hours" within the deviated hour of this change every year....
310#
311# From Douglas R. Bomberg (2007-03-12):
312# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
313# Statue 175 closer in synch with the US Congress' intent....
314# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
315
316# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
317Rule Chicago 1920 only - Jun 13 2:00 1:00 D
318Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
319Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
320Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
321Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
322Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
323# Zone NAME GMTOFF RULES FORMAT [UNTIL]
324Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
325 -6:00 US C%sT 1920
326 -6:00 Chicago C%sT 1936 Mar 1 2:00
327 -5:00 - EST 1936 Nov 15 2:00
328 -6:00 Chicago C%sT 1942
329 -6:00 US C%sT 1946
330 -6:00 Chicago C%sT 1967
331 -6:00 US C%sT
332# Oliver County, ND switched from mountain to central time on 1992-10-25.
333Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
334 -7:00 US M%sT 1992 Oct 25 02:00
335 -6:00 US C%sT
336# Morton County, ND, switched from mountain to central time on
337# 2003-10-26, except for the area around Mandan which was already central time.
338# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
339# Officially this switch also included part of Sioux County, and
340# Jones, Mellette, and Todd Counties in South Dakota;
341# but in practice these other counties were already observing central time.
342# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
343Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
344 -7:00 US M%sT 2003 Oct 26 02:00
345 -6:00 US C%sT
346
347# US mountain time, represented by Denver
348#
349# Colorado, far western Kansas, Montana, western
350# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
351# New Mexico, southwestern North Dakota,
352# western South Dakota, far western Texas (El Paso County, Hudspeth County,
353# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
354#
355# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
356Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
357Rule Denver 1920 only - Oct lastSun 2:00 0 S
358Rule Denver 1921 only - May 22 2:00 0 S
359Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
360Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
361# Zone NAME GMTOFF RULES FORMAT [UNTIL]
362Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
363 -7:00 US M%sT 1920
364 -7:00 Denver M%sT 1942
365 -7:00 US M%sT 1946
366 -7:00 Denver M%sT 1967
367 -7:00 US M%sT
368
369# US Pacific time, represented by Los Angeles
370#
371# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
372# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
373# and the northern three-quarters of Idaho county),
374# most of Nevada, most of Oregon, and Washington
375#
376# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
377Rule CA 1948 only - Mar 14 2:00 1:00 D
378Rule CA 1949 only - Jan 1 2:00 0 S
379Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
380Rule CA 1950 1961 - Sep lastSun 2:00 0 S
381Rule CA 1962 1966 - Oct lastSun 2:00 0 S
382# Zone NAME GMTOFF RULES FORMAT [UNTIL]
383Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
384 -8:00 US P%sT 1946
385 -8:00 CA P%sT 1967
386 -8:00 US P%sT
387
388# Alaska
389# AK%sT is the modern abbreviation for -9:00 per USNO.
390#
391# From Paul Eggert (2001-05-30):
392# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
393# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
394# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
395# also a Friday. Include only the time zone part of this transition,
396# ignoring the switch from Julian to Gregorian, since we can't represent
397# the Julian calendar.
398#
399# As far as we know, none of the exact locations mentioned below were
400# permanently inhabited in 1867 by anyone using either calendar.
401# (Yakutat was colonized by the Russians in 1799, but the settlement
402# was destroyed in 1805 by a Yakutat-kon war party.) However, there
403# were nearby inhabitants in some cases and for our purposes perhaps
404# it's best to simply use the official transition.
405#
406# Zone NAME GMTOFF RULES FORMAT [UNTIL]
407Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
408 -8:57:41 - LMT 1900 Aug 20 12:00
409 -8:00 - PST 1942
410 -8:00 US P%sT 1946
411 -8:00 - PST 1969
412 -8:00 US P%sT 1983 Oct 30 2:00
413 -9:00 US Y%sT 1983 Nov 30
414 -9:00 US AK%sT
415Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
416 -9:18:55 - LMT 1900 Aug 20 12:00
417 -9:00 - YST 1942
418 -9:00 US Y%sT 1946
419 -9:00 - YST 1969
420 -9:00 US Y%sT 1983 Nov 30
421 -9:00 US AK%sT
422Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
423 -9:59:36 - LMT 1900 Aug 20 12:00
424 -10:00 - CAT 1942
425 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
426 -10:00 US CAT/CAPT 1946 # Peace
427 -10:00 - CAT 1967 Apr
428 -10:00 - AHST 1969
429 -10:00 US AH%sT 1983 Oct 30 2:00
430 -9:00 US Y%sT 1983 Nov 30
431 -9:00 US AK%sT
432Zone America/Nome 12:58:21 - LMT 1867 Oct 18
433 -11:01:38 - LMT 1900 Aug 20 12:00
434 -11:00 - NST 1942
435 -11:00 US N%sT 1946
436 -11:00 - NST 1967 Apr
437 -11:00 - BST 1969
438 -11:00 US B%sT 1983 Oct 30 2:00
439 -9:00 US Y%sT 1983 Nov 30
440 -9:00 US AK%sT
441Zone America/Adak 12:13:21 - LMT 1867 Oct 18
442 -11:46:38 - LMT 1900 Aug 20 12:00
443 -11:00 - NST 1942
444 -11:00 US N%sT 1946
445 -11:00 - NST 1967 Apr
446 -11:00 - BST 1969
447 -11:00 US B%sT 1983 Oct 30 2:00
448 -10:00 US AH%sT 1983 Nov 30
449 -10:00 US HA%sT
450# The following switches don't quite make our 1970 cutoff.
451#
452# Shanks writes that part of southwest Alaska (e.g. Aniak)
453# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
454# and another part (e.g. Akiak) made the same switch five weeks later.
455#
456# From David Flater (2004-11-09):
457# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
458# Historic Preservation Commission, provided this information, which
459# suggests that Unalaska deviated from statutory time from early 1967
460# possibly until 1983:
461#
462# Minutes of the Unalaska City Council Meeting, January 10, 1967:
463# "Except for St. Paul and Akutan, Unalaska is the only important
464# location not on Alaska Standard Time. The following resolution was
465# made by William Robinson and seconded by Henry Swanson: Be it
466# resolved that the City of Unalaska hereby goes to Alaska Standard
467# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
468# January 14, Alaska Standard Time.) This resolution was passed with
469# three votes for and one against."
470
471# Hawaii
472#
473# From Arthur David Olson:
474# And then there's Hawaii.
475# DST was observed for one day in 1933;
476# standard time was changed by half an hour in 1947;
477# it's always standard as of 1986.
478#
479# From Paul Eggert:
480# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
481#
482Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
483 -10:30 - HST 1933 Apr 30 2:00
484 -10:30 1:00 HDT 1933 May 21 2:00
485 -10:30 US H%sT 1947 Jun 8 2:00
486 -10:00 - HST
487
488# Now we turn to US areas that have diverged from the consensus since 1970.
489
490# Arizona mostly uses MST.
491
492# From Paul Eggert (2002-10-20):
493#
494# The information in the rest of this paragraph is derived from the
495# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
496# Daylight Saving Time web page (2002-01-23)</a> maintained by the
497# Arizona State Library, Archives and Public Records.
498# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
499# time, but by federal law railroads, airlines, bus lines, military
500# personnel, and some engaged in interstate commerce continued to
501# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
502# Gazette says that was the date the law changed, and that 04-01 was
503# the date the state's clocks would change. In 1945 the State of
504# Arizona used standard time all year, again with exceptions only as
505# mandated by federal law. Arizona observed DST in 1967, but Arizona
506# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
507#
508# Shanks says the 1944 experiment came to an end on 1944-03-17.
509# Go with the Arizona State Library instead.
510
511Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
512 -7:00 US M%sT 1944 Jan 1 00:01
513 -7:00 - MST 1944 Apr 1 00:01
514 -7:00 US M%sT 1944 Oct 1 00:01
515 -7:00 - MST 1967
516 -7:00 US M%sT 1968 Mar 21
517 -7:00 - MST
518# From Arthur David Olson (1988-02-13):
519# A writer from the Inter Tribal Council of Arizona, Inc.,
520# notes in private correspondence dated 1987-12-28 that "Presently, only the
521# Navajo Nation participates in the Daylight Saving Time policy, due to its
522# large size and location in three states." (The "only" means that other
523# tribal nations don't use DST.)
524
525Link America/Denver America/Shiprock
526
527# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
528# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
529# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
530# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
531# Teton, Twin Falls, Valley, Washington counties, and the southern
532# quarter of Idaho county) and eastern Oregon (most of Malheur County)
533# switched four weeks late in 1974.
534#
535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
536Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
537 -8:00 US P%sT 1923 May 13 2:00
538 -7:00 US M%sT 1974
539 -7:00 - MST 1974 Feb 3 2:00
540 -7:00 US M%sT
541
542# Indiana
543#
544# For a map of Indiana's time zone regions, see:
545# <a href="http://www.mccsc.edu/time.html">
546# What time is it in Indiana?
547# </a> (2006-03-01)
548#
549# From Paul Eggert (2007-08-17):
550# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
551# with the following exceptions:
552#
553# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
554# Vandenburgh, and Warrick counties have been like America/Chicago.
555#
556# - Dearborn and Ohio counties have been like America/New_York.
557#
558# - Clark, Floyd, and Harrison counties have been like
559# America/Kentucky/Louisville.
560#
561# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
562# and Switzerland counties have their own time zone histories as noted below.
563#
564# Shanks partitioned Indiana into 345 regions, each with its own time history,
565# and wrote ``Even newspaper reports present contradictory information.''
566# Those Hoosiers! Such a flighty and changeable people!
567# Fortunately, most of the complexity occurred before our cutoff date of 1970.
568#
569# Other than Indianapolis, the Indiana place names are so nondescript
570# that they would be ambiguous if we left them at the `America' level.
571# So we reluctantly put them all in a subdirectory `America/Indiana'.
572
573# From Paul Eggert (2005-08-16):
574# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
575
576# From Nathan Stratton Treadway (2006-03-30):
577# http://www.dot.gov/affairs/dot0406.htm [3705 B]
578# From Deborah Goldsmith (2006-01-18):
579# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
580# From Paul Eggert (2006-01-20):
581# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
582# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
583# Eastern Time Zone to the Central Time Zone.... The effective date of
584# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
585# changeover date from standard time to Daylight Saving Time."
586# Strictly speaking, this means the affected counties will change their
587# clocks twice that night, but this obviously is in error. The intent
588# is that 01:59:59 EST be followed by 02:00:00 CDT.
589
590# From Gwillim Law (2007-02-10):
591# The Associated Press has been reporting that Pulaski County, Indiana is
592# going to switch from Central to Eastern Time on March 11, 2007....
593# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
594
595# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
596Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
597Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
598Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
599# Zone NAME GMTOFF RULES FORMAT [UNTIL]
600Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
601 -6:00 US C%sT 1920
602 -6:00 Indianapolis C%sT 1942
603 -6:00 US C%sT 1946
604 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
605 -5:00 - EST 1957 Sep 29 2:00
606 -6:00 - CST 1958 Apr 27 2:00
607 -5:00 - EST 1969
608 -5:00 US E%sT 1971
609 -5:00 - EST 2006
610 -5:00 US E%sT
611#
612# Eastern Crawford County, Indiana, left its clocks alone in 1974,
613# as well as from 1976 through 2005.
614# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
615Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
616Rule Marengo 1951 only - Sep lastSun 2:00 0 S
617Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
618Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
619# Zone NAME GMTOFF RULES FORMAT [UNTIL]
620Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
621 -6:00 US C%sT 1951
622 -6:00 Marengo C%sT 1961 Apr 30 2:00
623 -5:00 - EST 1969
624 -5:00 US E%sT 1974 Jan 6 2:00
625 -6:00 1:00 CDT 1974 Oct 27 2:00
626 -5:00 US E%sT 1976
627 -5:00 - EST 2006
628 -5:00 US E%sT
629#
630# Daviess, Dubois, Knox, and Martin Counties, Indiana,
631# switched from eastern to central time in April 2006, then switched back
632# in November 2007.
633# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
634Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
635Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
636Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
637Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
638Rule Vincennes 1955 only - May 1 0:00 1:00 D
639Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
640Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
641Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
642Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
644Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
645 -6:00 US C%sT 1946
646 -6:00 Vincennes C%sT 1964 Apr 26 2:00
647 -5:00 - EST 1969
648 -5:00 US E%sT 1971
649 -5:00 - EST 2006 Apr 2 2:00
650 -6:00 US C%sT 2007 Nov 4 2:00
651 -5:00 US E%sT
652#
653# Perry County, Indiana, switched from eastern to central time in April 2006.
654# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
655Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
656Rule Perry 1946 only - Sep lastSun 2:00 0 S
657Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
658Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
659Rule Perry 1955 only - May 1 0:00 1:00 D
660Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
661Rule Perry 1960 only - Oct lastSun 2:00 0 S
662Rule Perry 1961 only - Sep lastSun 2:00 0 S
663Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
665Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
666 -6:00 US C%sT 1946
667 -6:00 Perry C%sT 1964 Apr 26 2:00
668 -5:00 - EST 1969
669 -5:00 US E%sT 1971
670 -5:00 - EST 2006 Apr 2 2:00
671 -6:00 US C%sT
672#
673# Pike County, Indiana moved from central to eastern time in 1977,
674# then switched back in 2006, then switched back again in 2007.
675# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
676Rule Pike 1955 only - May 1 0:00 1:00 D
677Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
678Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
679Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
680# Zone NAME GMTOFF RULES FORMAT [UNTIL]
681Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
682 -6:00 US C%sT 1955
683 -6:00 Pike C%sT 1965 Apr 25 2:00
684 -5:00 - EST 1966 Oct 30 2:00
685 -6:00 US C%sT 1977 Oct 30 2:00
686 -5:00 - EST 2006 Apr 2 2:00
687 -6:00 US C%sT 2007 Nov 4 2:00
688 -5:00 US E%sT
689#
690# Starke County, Indiana moved from central to eastern time in 1991,
691# then switched back in 2006.
692# From Arthur David Olson (1991-10-28):
693# An article on page A3 of the Sunday, 1991-10-27 Washington Post
694# notes that Starke County switched from Central time to Eastern time as of
695# 1991-10-27.
696# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
697Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
698Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
699Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
700Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
701Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
702# Zone NAME GMTOFF RULES FORMAT [UNTIL]
703Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
704 -6:00 US C%sT 1947
705 -6:00 Starke C%sT 1962 Apr 29 2:00
706 -5:00 - EST 1963 Oct 27 2:00
707 -6:00 US C%sT 1991 Oct 27 2:00
708 -5:00 - EST 2006 Apr 2 2:00
709 -6:00 US C%sT
710#
711# Pulaski County, Indiana, switched from eastern to central time in
712# April 2006 and then switched back in March 2007.
713# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
714Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
715Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
716Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
717Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
718# Zone NAME GMTOFF RULES FORMAT [UNTIL]
719Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
720 -6:00 US C%sT 1946
721 -6:00 Pulaski C%sT 1961 Apr 30 2:00
722 -5:00 - EST 1969
723 -5:00 US E%sT 1971
724 -5:00 - EST 2006 Apr 2 2:00
725 -6:00 US C%sT 2007 Mar 11 2:00
726 -5:00 US E%sT
727#
728# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
729# Zone NAME GMTOFF RULES FORMAT [UNTIL]
730Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
731 -6:00 US C%sT 1954 Apr 25 2:00
732 -5:00 - EST 1969
733 -5:00 US E%sT 1973
734 -5:00 - EST 2006
735 -5:00 US E%sT
736
737# Part of Kentucky left its clocks alone in 1974.
738# This also includes Clark, Floyd, and Harrison counties in Indiana.
739# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
740Rule Louisville 1921 only - May 1 2:00 1:00 D
741Rule Louisville 1921 only - Sep 1 2:00 0 S
742Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
743Rule Louisville 1941 only - Sep lastSun 2:00 0 S
744Rule Louisville 1946 only - Jun 2 2:00 0 S
745Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
746Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
747# Zone NAME GMTOFF RULES FORMAT [UNTIL]
748Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
749 -6:00 US C%sT 1921
750 -6:00 Louisville C%sT 1942
751 -6:00 US C%sT 1946
752 -6:00 Louisville C%sT 1961 Jul 23 2:00
753 -5:00 - EST 1968
754 -5:00 US E%sT 1974 Jan 6 2:00
755 -6:00 1:00 CDT 1974 Oct 27 2:00
756 -5:00 US E%sT
757#
758# Wayne County, Kentucky
759#
760# From
761# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
762# Lake Cumberland LIFE
763# </a> (1999-01-29) via WKYM-101.7:
764# Clinton County has joined Wayne County in asking the DoT to change from
765# the Central to the Eastern time zone.... The Wayne County government made
766# the same request in December. And while Russell County officials have not
767# taken action, the majority of respondents to a poll conducted there in
768# August indicated they would like to change to "fast time" also.
769# The three Lake Cumberland counties are the farthest east of any U.S.
770# location in the Central time zone.
771#
772# From Rich Wales (2000-08-29):
773# After prolonged debate, and despite continuing deep differences of opinion,
774# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
775# (-0500) time. They won't "fall back" this year. See Sara Shipley,
776# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
777#
778# From Paul Eggert (2001-07-16):
779# The final rule was published in the
780# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
781# Federal Register 65, 160 (2000-08-17), page 50154-50158.
782# </a>
783#
784Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
785 -6:00 US C%sT 1946
786 -6:00 - CST 1968
787 -6:00 US C%sT 2000 Oct 29 2:00
788 -5:00 US E%sT
789
790
791# From Rives McDow (2000-08-30):
792# Here ... are all the changes in the US since 1985.
793# Kearny County, KS (put all of county on central;
794# previously split between MST and CST) ... 1990-10
795# Starke County, IN (from CST to EST) ... 1991-10
796# Oliver County, ND (from MST to CST) ... 1992-10
797# West Wendover, NV (from PST TO MST) ... 1999-10
798# Wayne County, KY (from CST to EST) ... 2000-10
799#
800# From Paul Eggert (2001-07-17):
801# We don't know where the line used to be within Kearny County, KS,
802# so omit that change for now.
803# See America/Indiana/Knox for the Starke County, IN change.
804# See America/North_Dakota/Center for the Oliver County, ND change.
805# West Wendover, NV officially switched from Pacific to mountain time on
806# 1999-10-31. See the
807# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
808# Federal Register 64, 203 (1999-10-21), page 56705-56707.
809# </a>
810# However, the Federal Register says that West Wendover already operated
811# on mountain time, and the rule merely made this official;
812# hence a separate tz entry is not needed.
813
814# Michigan
815#
816# From Bob Devine (1988-01-28):
817# Michigan didn't observe DST from 1968 to 1973.
818#
819# From Paul Eggert (1999-03-31):
820# Shanks writes that Michigan started using standard time on 1885-09-18,
821# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
822# that Detroit kept
823#
824# local time until 1900 when the City Council decreed that clocks should
825# be put back twenty-eight minutes to Central Standard Time. Half the
826# city obeyed, half refused. After considerable debate, the decision
827# was rescinded and the city reverted to Sun time. A derisive offer to
828# erect a sundial in front of the city hall was referred to the
829# Committee on Sewers. Then, in 1905, Central time was adopted
830# by city vote.
831#
832# This story is too entertaining to be false, so go with Howse over Shanks.
833#
834# From Paul Eggert (2001-03-06):
835# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
836# one hour in 1914.'' This change is not in Shanks. We have no more
837# info, so omit this for now.
838#
839# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
840# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
841Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
842Rule Detroit 1948 only - Sep lastSun 2:00 0 S
843Rule Detroit 1967 only - Jun 14 2:00 1:00 D
844Rule Detroit 1967 only - Oct lastSun 2:00 0 S
845# Zone NAME GMTOFF RULES FORMAT [UNTIL]
846Zone America/Detroit -5:32:11 - LMT 1905
847 -6:00 - CST 1915 May 15 2:00
848 -5:00 - EST 1942
849 -5:00 US E%sT 1946
850 -5:00 Detroit E%sT 1973
851 -5:00 US E%sT 1975
852 -5:00 - EST 1975 Apr 27 2:00
853 -5:00 US E%sT
854#
855# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
856# switched from EST to CST/CDT in 1973.
857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
858Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
859Rule Menominee 1946 only - Sep lastSun 2:00 0 S
860Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
861Rule Menominee 1966 only - Oct lastSun 2:00 0 S
862# Zone NAME GMTOFF RULES FORMAT [UNTIL]
863Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
864 -6:00 US C%sT 1946
865 -6:00 Menominee C%sT 1969 Apr 27 2:00
866 -5:00 - EST 1973 Apr 29 2:00
867 -6:00 US C%sT
868
869# Navassa
870# administered by the US Fish and Wildlife Service
871# claimed by US under the provisions of the 1856 Guano Islands Act
872# also claimed by Haiti
873# occupied 1857/1900 by the Navassa Phosphate Co
874# US lighthouse 1917/1996-09
875# currently uninhabited
876# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
877# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
878# Jimmy Skaggs, _The Great Guano Rush_ (1994).
879
880################################################################################
881
882
883# From Paul Eggert (2006-03-22):
884# A good source for time zone historical data outside the U.S. is
885# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
886# San Diego: ACS Publications, Inc. (2003).
887#
888# Gwillim Law writes that a good source
889# for recent time zone data is the International Air Transport
890# Association's Standard Schedules Information Manual (IATA SSIM),
891# published semiannually. Law sent in several helpful summaries
892# of the IATA's data after 1990.
893#
894# Except where otherwise noted, Shanks & Pottenger is the source for
895# entries through 1990, and IATA SSIM is the source for entries afterwards.
896#
897# Other sources occasionally used include:
898#
899# Edward W. Whitman, World Time Differences,
900# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
901# which I found in the UCLA library.
902#
903# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
904# William Willett, The Waste of Daylight, 19th edition
905# </a> (1914-03)
906#
907# See the `europe' file for Greenland.
908
909# Canada
910
911# From Alain LaBont<e'> (1994-11-14):
912# I post here the time zone abbreviations standardized in Canada
913# for both English and French in the CAN/CSA-Z234.4-89 standard....
914#
915# UTC Standard time Daylight savings time
916# offset French English French English
917# -2:30 - - HAT NDT
918# -3 - - HAA ADT
919# -3:30 HNT NST - -
920# -4 HNA AST HAE EDT
921# -5 HNE EST HAC CDT
922# -6 HNC CST HAR MDT
923# -7 HNR MST HAP PDT
924# -8 HNP PST HAY YDT
925# -9 HNY YST - -
926#
927# HN: Heure Normale ST: Standard Time
928# HA: Heure Avanc<e'>e DT: Daylight saving Time
929#
930# A: de l'Atlantique Atlantic
931# C: du Centre Central
932# E: de l'Est Eastern
933# M: Mountain
934# N: Newfoundland
935# P: du Pacifique Pacific
936# R: des Rocheuses
937# T: de Terre-Neuve
938# Y: du Yukon Yukon
939#
940# From Paul Eggert (1994-11-22):
941# Alas, this sort of thing must be handled by localization software.
942
943# Unless otherwise specified, the data for Canada are all from Shanks
944# & Pottenger.
945
946# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
947# 2007-03-01):
948# The British Columbia government announced yesterday that it will
949# adjust daylight savings next year to align with changes in the
950# U.S. and the rest of Canada....
951# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
952# ...
953# Nova Scotia
954# Daylight saving time will be extended by four weeks starting in 2007....
955# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
956#
957# [For New Brunswick] the new legislation dictates that the time change is to
958# be done at 02:00 instead of 00:01.
959# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
960# ...
961# Manitoba has traditionally changed the clock every fall at 03:00.
962# As of 2006, the transition is to take place one hour earlier at 02:00.
963# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
964# ...
965# [Alberta, Ontario, Quebec] will follow US rules.
966# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
967# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
968# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
969# ...
970# P.E.I. will follow US rules....
971# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
972# ...
973# Province of Newfoundland and Labrador....
974# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
975# ...
976# Yukon
977# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
978# ...
979# N.W.T. will follow US rules. Whoever maintains the government web site
980# does not seem to believe in bookmarks. To see the news release, click the
981# following link and search for "Daylight Savings Time Change". Press the
982# "Daylight Savings Time Change" link; it will fire off a popup using
983# JavaScript.
984# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
985# ...
986# Nunavut
987# An amendment to the Interpretation Act was registered on February 19/2007....
988# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
989
990# From Paul Eggert (2006-04-25):
991# H. David Matthews and Mary Vincent's map
992# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
993# "It's about TIME", _Canadian Geographic_ (September-October 1998)
994# </a> contains detailed boundaries for regions observing nonstandard
995# time and daylight saving time arrangements in Canada circa 1998.
996#
997# INMS, the Institute for National Measurement Standards in Ottawa, has <a
998# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
999# information about standard and daylight saving time zones in Canada.
1000# </a> (updated periodically).
1001# Its unofficial information is often taken from Matthews and Vincent.
1002
1003# From Paul Eggert (2006-06-27):
1004# For now, assume all of DST-observing Canada will fall into line with the
1005# new US DST rules,
1006
1007# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1008Rule Canada 1918 only - Apr 14 2:00 1:00 D
1009Rule Canada 1918 only - Oct 31 2:00 0 S
1010Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1011Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1012Rule Canada 1945 only - Sep 30 2:00 0 S
1013Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1014Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1015Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1016Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1017Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1018
1019
1020# Newfoundland and Labrador
1021
1022# From Paul Eggert (2000-10-02):
1023# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1024# but the only part of Labrador that follows the rules is the
1025# southeast corner, including Port Hope Simpson and Mary's Harbour,
1026# but excluding, say, Black Tickle.
1027
1028# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1029Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1030Rule StJohns 1917 only - Sep 17 2:00 0 S
1031# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1032Rule StJohns 1919 only - May 5 23:00 1:00 D
1033Rule StJohns 1919 only - Aug 12 23:00 0 S
1034# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1035Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1036Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1037# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1038# Pottenger.
1039Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1040Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1041# Whitman gives the following transitions:
1042# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1043# but go with Shanks & Pottenger and assume they used Canadian rules.
1044# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1045# Apr 30 - Sep 24; go with Shanks & Pottenger.
1046Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1047Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1048Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1049Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1050Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1051# From Paul Eggert (2000-10-02):
1052# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1053# at 00:01 local time. For now, assume it started in 1987.
1054Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1055Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1056Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1057Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1058Rule StJohns 2007 max - Mar Sun>=8 0:01 1:00 D
1059Rule StJohns 2007 max - Nov Sun>=1 0:01 0 S
1060#
1061# St John's has an apostrophe, but Posix file names can't have apostrophes.
1062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1063Zone America/St_Johns -3:30:52 - LMT 1884
1064 -3:30:52 StJohns N%sT 1918
1065 -3:30:52 Canada N%sT 1919
1066 -3:30:52 StJohns N%sT 1935 Mar 30
1067 -3:30 StJohns N%sT 1942 May 11
1068 -3:30 Canada N%sT 1946
1069 -3:30 StJohns N%sT
1070
1071# most of east Labrador
1072
1073# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1074# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1075Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1076 -3:30:52 - NST 1918
1077 -3:30:52 Canada N%sT 1919
1078 -3:30:52 - NST 1935 Mar 30
1079 -3:30 - NST 1936
1080 -3:30 StJohns N%sT 1942 May 11
1081 -3:30 Canada N%sT 1946
1082 -3:30 StJohns N%sT 1966 Mar 15 2:00
1083 -4:00 StJohns A%sT
1084
1085
1086# west Labrador, Nova Scotia, Prince Edward I
1087
1088# From Paul Eggert (2006-03-22):
1089# Shanks & Pottenger write that since 1970 most of this region has been like
1090# Halifax. Many locales did not observe peacetime DST until 1972;
1091# Glace Bay, NS is the largest that we know of.
1092# Shanks & Pottenger also write that Liverpool, NS was the only town
1093# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1094# this is a typo.
1095
1096# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1097Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1098Rule Halifax 1916 only - Oct 1 0:00 0 S
1099Rule Halifax 1920 only - May 9 0:00 1:00 D
1100Rule Halifax 1920 only - Aug 29 0:00 0 S
1101Rule Halifax 1921 only - May 6 0:00 1:00 D
1102Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1103Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1104Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1105Rule Halifax 1923 only - Sep 4 0:00 0 S
1106Rule Halifax 1924 only - Sep 15 0:00 0 S
1107Rule Halifax 1925 only - Sep 28 0:00 0 S
1108Rule Halifax 1926 only - May 16 0:00 1:00 D
1109Rule Halifax 1926 only - Sep 13 0:00 0 S
1110Rule Halifax 1927 only - May 1 0:00 1:00 D
1111Rule Halifax 1927 only - Sep 26 0:00 0 S
1112Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1113Rule Halifax 1928 only - Sep 9 0:00 0 S
1114Rule Halifax 1929 only - Sep 3 0:00 0 S
1115Rule Halifax 1930 only - Sep 15 0:00 0 S
1116Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1117Rule Halifax 1932 only - May 1 0:00 1:00 D
1118Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1119Rule Halifax 1933 only - Oct 2 0:00 0 S
1120Rule Halifax 1934 only - May 20 0:00 1:00 D
1121Rule Halifax 1934 only - Sep 16 0:00 0 S
1122Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1123Rule Halifax 1935 only - Sep 30 0:00 0 S
1124Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1125Rule Halifax 1936 only - Sep 14 0:00 0 S
1126Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1127Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1128Rule Halifax 1939 only - May 28 0:00 1:00 D
1129Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1130Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1131Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1132Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1133Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1134Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1135Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1136Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1137Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1138# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1139Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1140 -4:00 Halifax A%sT 1918
1141 -4:00 Canada A%sT 1919
1142 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1143 -4:00 Canada A%sT 1946
1144 -4:00 Halifax A%sT 1974
1145 -4:00 Canada A%sT
1146Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1147 -4:00 Canada A%sT 1953
1148 -4:00 Halifax A%sT 1954
1149 -4:00 - AST 1972
1150 -4:00 Halifax A%sT 1974
1151 -4:00 Canada A%sT
1152
1153# New Brunswick
1154
1155# From Paul Eggert (2007-01-31):
1156# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1157# says they changed at 00:01 through 2006, and
1158# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1159# clear that this was the case since at least 1993.
1160# For now, assume it started in 1993.
1161
1162# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1163Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1164Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1165Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1166Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1167Rule Moncton 1939 only - May 27 1:00 1:00 D
1168Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1169Rule Moncton 1940 only - May 19 1:00 1:00 D
1170Rule Moncton 1941 only - May 4 1:00 1:00 D
1171Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1172Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1173Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1174Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1175Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1176# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1177Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1178 -5:00 - EST 1902 Jun 15
1179 -4:00 Canada A%sT 1933
1180 -4:00 Moncton A%sT 1942
1181 -4:00 Canada A%sT 1946
1182 -4:00 Moncton A%sT 1973
1183 -4:00 Canada A%sT 1993
1184 -4:00 Moncton A%sT 2007
1185 -4:00 Canada A%sT
1186
1187# Quebec
1188
1189# From Paul Eggert (2006-07-09):
1190# Shanks & Pottenger write that since 1970 most of Quebec has been
1191# like Montreal.
1192
1193# From Paul Eggert (2006-06-27):
1194# Matthews and Vincent (1998) also write that Quebec east of the -63
1195# meridian is supposed to observe AST, but residents as far east as
1196# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1197# In "Official time in Quebec" the Quebec department of justice writes in
1198# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1199# that "The residents of the Municipality of the
1200# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1201# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1202# written and use Atlantic standard time all year round. The same applies to
1203# the residents of the Native facilities along the lower North Shore."
1204# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1205# says this common practice was codified into law as of 2007.
1206# For lack of better info, guess this practice began around 1970, contra to
1207# Shanks & Pottenger who have this region observing AST/ADT.
1208
1209# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1210Rule Mont 1917 only - Mar 25 2:00 1:00 D
1211Rule Mont 1917 only - Apr 24 0:00 0 S
1212Rule Mont 1919 only - Mar 31 2:30 1:00 D
1213Rule Mont 1919 only - Oct 25 2:30 0 S
1214Rule Mont 1920 only - May 2 2:30 1:00 D
1215Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1216Rule Mont 1921 only - May 1 2:00 1:00 D
1217Rule Mont 1922 only - Apr 30 2:00 1:00 D
1218Rule Mont 1924 only - May 17 2:00 1:00 D
1219Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1220Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1221# The 1927-to-1937 rules can be expressed more simply as
1222# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1223# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1224# The rules below avoid use of 24:00
1225# (which pre-1998 versions of zic cannot handle).
1226Rule Mont 1927 only - May 1 0:00 1:00 D
1227Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1228Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1229Rule Mont 1932 only - May 1 0:00 1:00 D
1230Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1231Rule Mont 1933 only - Oct 1 0:00 0 S
1232Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1233Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1234Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1235Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1236Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1237Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1238
1239# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1240Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1241 -4:00 Canada A%sT 1970
1242 -4:00 - AST
1243Zone America/Montreal -4:54:16 - LMT 1884
1244 -5:00 Mont E%sT 1918
1245 -5:00 Canada E%sT 1919
1246 -5:00 Mont E%sT 1942 Feb 9 2:00s
1247 -5:00 Canada E%sT 1946
1248 -5:00 Mont E%sT 1974
1249 -5:00 Canada E%sT
1250
1251
1252# Ontario
1253
1254# From Paul Eggert (2006-07-09):
1255# Shanks & Pottenger write that since 1970 most of Ontario has been like
1256# Toronto.
1257# Thunder Bay skipped DST in 1973.
1258# Many smaller locales did not observe peacetime DST until 1974;
1259# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1260# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1261
1262# From Mark Brader (2003-07-26):
1263# [According to the Toronto Star] Orillia, Ontario, adopted DST
1264# effective Saturday, 1912-06-22, 22:00; the article mentions that
1265# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1266# have already done so. In Orillia DST was to run until Saturday,
1267# 1912-08-31 (no time mentioned), but it was met with considerable
1268# hostility from certain segments of the public, and was revoked after
1269# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1270# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1271# earlier in June).
1272#
1273# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1274
1275# From Paul Eggert (1997-10-17):
1276# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1277# says that Atikokan, Ontario currently does not observe DST,
1278# but will vote on 11-10 whether to use EST/EDT.
1279# He also writes that the
1280# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1281# Ontario Time Act (1990, Chapter T.9)
1282# </a>
1283# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1284# Officially Atikokan is therefore on CST/CDT, and most likely this report
1285# concerns a non-official time observed as a matter of local practice.
1286#
1287# From Paul Eggert (2000-10-02):
1288# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1289# New Osnaburgh observe CST all year, that Big Trout Lake observes
1290# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1291# violation of the official Ontario rules.
1292#
1293# From Paul Eggert (2006-07-09):
1294# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1295# 2005-07-21 Chronicle-Journal, which said:
1296#
1297# The clocks in Atikokan stay set on standard time year-round.
1298# This means they spend about half the time on central time and
1299# the other half on eastern time.
1300#
1301# For the most part, the system works, Mayor Dennis Brown said.
1302#
1303# "The majority of businesses in Atikokan deal more with Eastern
1304# Canada, but there are some that deal with Western Canada," he
1305# said. "I don't see any changes happening here."
1306#
1307# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1308# [New Osnaburgh] follow the same practice."
1309
1310# From Garry McKinnon (2006-07-14) via Chris Walton:
1311# I chatted with a member of my board who has an outstanding memory
1312# and a long history in Atikokan (and in the telecom industry) and he
1313# can say for certain that Atikokan has been practicing the current
1314# time keeping since 1952, at least.
1315
1316# From Paul Eggert (2006-07-17):
1317# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1318# ever since standard time was introduced, but the information from
1319# McKinnon sounds more authoritative. For now, assume that Atikokan
1320# switched to EST immediately after WWII era daylight saving time
1321# ended. This matches the old (less-populous) America/Coral_Harbour
1322# entry since our cutoff date of 1970, so we can move
1323# America/Coral_Harbour to the 'backward' file.
1324
1325# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1326Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1327Rule Toronto 1919 only - Oct 26 0:00 0 S
1328Rule Toronto 1920 only - May 2 2:00 1:00 D
1329Rule Toronto 1920 only - Sep 26 0:00 0 S
1330Rule Toronto 1921 only - May 15 2:00 1:00 D
1331Rule Toronto 1921 only - Sep 15 2:00 0 S
1332Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1333# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1334# was meant.
1335Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1336Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1337# The 1927-to-1939 rules can be expressed more simply as
1338# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1339# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1340# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1341# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1342# The rules below avoid use of Sun>=25
1343# (which pre-2004 versions of zic cannot handle).
1344Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1345Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1346Rule Toronto 1932 only - May 1 2:00 1:00 D
1347Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1348Rule Toronto 1933 only - Oct 1 2:00 0 S
1349Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1350Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1351Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1352Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1353Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1354Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1355Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1356Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1357Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1358# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1359# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1360# is wrong, and that he had confirmed it by checking the 1971-10-30
1361# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1362Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1363
1364# From Paul Eggert (2003-07-27):
1365# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1366# Port Arthur, Ontario, the principle of the Bill has been in
1367# operation for the past three years, and in the City of Moose Jaw,
1368# Saskatchewan, for one year."
1369
1370# From David Bryan via Tory Tronrud, Director/Curator,
1371# Thunder Bay Museum (2003-11-12):
1372# There is some suggestion, however, that, by-law or not, daylight
1373# savings time was being practiced in Fort William and Port Arthur
1374# before 1909.... [I]n 1910, the line between the Eastern and Central
1375# Time Zones was permanently moved about two hundred miles west to
1376# include the Thunder Bay area.... When Canada adopted daylight
1377# savings time in 1916, Fort William and Port Arthur, having done so
1378# already, did not change their clocks.... During the Second World
1379# War,... [t]he cities agreed to implement DST during the summer
1380# months for the remainder of the war years.
1381
1382# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1383Zone America/Toronto -5:17:32 - LMT 1895
1384 -5:00 Canada E%sT 1919
1385 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1386 -5:00 Canada E%sT 1946
1387 -5:00 Toronto E%sT 1974
1388 -5:00 Canada E%sT
1389Zone America/Thunder_Bay -5:57:00 - LMT 1895
1390 -6:00 - CST 1910
1391 -5:00 - EST 1942
1392 -5:00 Canada E%sT 1970
1393 -5:00 Mont E%sT 1973
1394 -5:00 - EST 1974
1395 -5:00 Canada E%sT
1396Zone America/Nipigon -5:53:04 - LMT 1895
1397 -5:00 Canada E%sT 1940 Sep 29
1398 -5:00 1:00 EDT 1942 Feb 9 2:00s
1399 -5:00 Canada E%sT
1400Zone America/Rainy_River -6:18:16 - LMT 1895
1401 -6:00 Canada C%sT 1940 Sep 29
1402 -6:00 1:00 CDT 1942 Feb 9 2:00s
1403 -6:00 Canada C%sT
1404Zone America/Atikokan -6:06:28 - LMT 1895
1405 -6:00 Canada C%sT 1940 Sep 29
1406 -6:00 1:00 CDT 1942 Feb 9 2:00s
1407 -6:00 Canada C%sT 1945 Sep 30 2:00
1408 -5:00 - EST
1409
1410
1411# Manitoba
1412
1413# From Rob Douglas (2006-04-06):
1414# the old Manitoba Time Act - as amended by Bill 2, assented to
1415# March 27, 1987 ... said ...
1416# "between two o'clock Central Standard Time in the morning of
1417# the first Sunday of April of each year and two o'clock Central
1418# Standard Time in the morning of the last Sunday of October next
1419# following, one hour in advance of Central Standard Time."...
1420# I believe that the English legislation [of the old time act] had =
1421# been assented to (March 22, 1967)....
1422# Also, as far as I can tell, there was no order-in-council varying
1423# the time of Daylight Saving Time for 2005 and so the provisions of
1424# the 1987 version would apply - the changeover was at 2:00 Central
1425# Standard Time (i.e. not until 3:00 Central Daylight Time).
1426
1427# From Paul Eggert (2006-04-10):
1428# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1429# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1430# it was also 02:00s in 1966.
1431
1432# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1433Rule Winn 1916 only - Apr 23 0:00 1:00 D
1434Rule Winn 1916 only - Sep 17 0:00 0 S
1435Rule Winn 1918 only - Apr 14 2:00 1:00 D
1436Rule Winn 1918 only - Oct 31 2:00 0 S
1437Rule Winn 1937 only - May 16 2:00 1:00 D
1438Rule Winn 1937 only - Sep 26 2:00 0 S
1439Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1440Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1441Rule Winn 1945 only - Sep lastSun 2:00 0 S
1442Rule Winn 1946 only - May 12 2:00 1:00 D
1443Rule Winn 1946 only - Oct 13 2:00 0 S
1444Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1445Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1446Rule Winn 1950 only - May 1 2:00 1:00 D
1447Rule Winn 1950 only - Sep 30 2:00 0 S
1448Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1449Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1450Rule Winn 1959 only - Oct lastSun 2:00 0 S
1451Rule Winn 1960 only - Sep lastSun 2:00 0 S
1452Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1453Rule Winn 1963 only - Sep 22 2:00 0 S
1454Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1455Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1456Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1457# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1458Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1459 -6:00 Winn C%sT 2006
1460 -6:00 Canada C%sT
1461
1462
1463# Saskatchewan
1464
1465# From Mark Brader (2003-07-26):
1466# The first actual adoption of DST in Canada was at the municipal
1467# level. As the [Toronto] Star put it (1912-06-07), "While people
1468# elsewhere have long been talking of legislation to save daylight,
1469# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1470# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1471# presumably late evening, as below), and would run until "the end of
1472# the summer". The discrepancy between municipal time and railroad
1473# time was noted.
1474
1475# From Paul Eggert (2003-07-27):
1476# Willett (1914-03) notes that DST "has been in operation ... in the
1477# City of Moose Jaw, Saskatchewan, for one year."
1478
1479# From Paul Eggert (2006-03-22):
1480# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1481# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1482# Other western towns (e.g. Lloydminster) are like Edmonton.
1483# Matthews and Vincent (1998) write that Denare Beach and Creighton
1484# are like Winnipeg, in violation of Saskatchewan law.
1485
1486# From W. Jones (1992-11-06):
1487# The. . .below is based on information I got from our law library, the
1488# provincial archives, and the provincial Community Services department.
1489# A precise history would require digging through newspaper archives, and
1490# since you didn't say what you wanted, I didn't bother.
1491#
1492# Saskatchewan is split by a time zone meridian (105W) and over the years
1493# the boundary became pretty ragged as communities near it reevaluated
1494# their affiliations in one direction or the other. In 1965 a provincial
1495# referendum favoured legislating common time practices.
1496#
1497# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1498# Saskatchewan 1978) was proclaimed, and established that the eastern
1499# part of Saskatchewan would use CST year round, that districts in
1500# northwest Saskatchewan would by default follow CST but could opt to
1501# follow Mountain Time rules (thus 1 hour difference in the winter and
1502# zero in the summer), and that districts in southwest Saskatchewan would
1503# by default follow MT but could opt to follow CST.
1504#
1505# It took a few years for the dust to settle (I know one story of a town
1506# on one time zone having its school in another, such that a mom had to
1507# serve her family lunch in two shifts), but presently it seems that only
1508# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1509# rules any more; all other districts appear to have used CST year round
1510# since sometime in the 1960s.
1511
1512# From Chris Walton (2006-06-26):
1513# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1514# long and rather painful to read.
1515# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1516
1517# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1518Rule Regina 1918 only - Apr 14 2:00 1:00 D
1519Rule Regina 1918 only - Oct 31 2:00 0 S
1520Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1521Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1522Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1523Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1524Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1525Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1526Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1527Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1528Rule Regina 1945 only - Sep lastSun 2:00 0 S
1529Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1530Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1531Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1532Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1533Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1534Rule Regina 1959 only - Oct lastSun 2:00 0 S
1535#
1536Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1537Rule Swift 1957 only - Oct lastSun 2:00 0 S
1538Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1539Rule Swift 1959 only - Oct lastSun 2:00 0 S
1540Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1541# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1542Zone America/Regina -6:58:36 - LMT 1905 Sep
1543 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1544 -6:00 - CST
1545Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1546 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1547 -7:00 Regina M%sT 1950
1548 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1549 -6:00 - CST
1550
1551
1552# Alberta
1553
1554# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1555Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1556Rule Edm 1918 only - Oct 31 2:00 0 S
1557Rule Edm 1919 only - May 27 2:00 0 S
1558Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1559Rule Edm 1920 only - Oct lastSun 2:00 0 S
1560Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1561Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1562Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1563Rule Edm 1945 only - Sep lastSun 2:00 0 S
1564Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1565Rule Edm 1947 only - Sep lastSun 2:00 0 S
1566Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1567Rule Edm 1967 only - Oct lastSun 2:00 0 S
1568Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1569Rule Edm 1969 only - Oct lastSun 2:00 0 S
1570Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1571Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1572# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1573Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1574 -7:00 Edm M%sT 1987
1575 -7:00 Canada M%sT
1576
1577
1578# British Columbia
1579
1580# From Paul Eggert (2006-03-22):
1581# Shanks & Pottenger write that since 1970 most of this region has
1582# been like Vancouver.
1583# Dawson Creek uses MST. Much of east BC is like Edmonton.
1584# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1585
1586# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1587Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1588Rule Vanc 1918 only - Oct 31 2:00 0 S
1589Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1590Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1591Rule Vanc 1945 only - Sep 30 2:00 0 S
1592Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1593Rule Vanc 1946 only - Oct 13 2:00 0 S
1594Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1595Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1596# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1597Zone America/Vancouver -8:12:28 - LMT 1884
1598 -8:00 Vanc P%sT 1987
1599 -8:00 Canada P%sT
1600Zone America/Dawson_Creek -8:00:56 - LMT 1884
1601 -8:00 Canada P%sT 1947
1602 -8:00 Vanc P%sT 1972 Aug 30 2:00
1603 -7:00 - MST
1604
1605
1606# Northwest Territories, Nunavut, Yukon
1607
1608# From Paul Eggert (2006-03-22):
1609# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1610# Mathew Englander (1996-10-07) gives the following refs:
1611# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1612# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1613# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1614# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1615# * O.I.C. 1980/02 established DST.
1616# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1617# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1618# with Englander.
1619# From Chris Walton (2006-06-26):
1620# Here is a link to the old daylight saving portion of the interpretation
1621# act which was last updated in 1987:
1622# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1623
1624# From Rives McDow (1999-09-04):
1625# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1626# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1627# Nunavut moves to single time zone Oct. 31
1628# </a>
1629#
1630# From Antoine Leca (1999-09-06):
1631# We then need to create a new timezone for the Kitikmeot region of Nunavut
1632# to differentiate it from the Yellowknife region.
1633
1634# From Paul Eggert (1999-09-20):
1635# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1636# Basic Facts: The New Territory
1637# </a> (1999) reports that Pangnirtung operates on eastern time,
1638# and that Coral Harbour does not observe DST. We don't know when
1639# Pangnirtung switched to eastern time; we'll guess 1995.
1640
1641# From Rives McDow (1999-11-08):
1642# On October 31, when the rest of Nunavut went to Central time,
1643# Pangnirtung wobbled. Here is the result of their wobble:
1644#
1645# The following businesses and organizations in Pangnirtung use Central Time:
1646#
1647# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1648# Eastern Arctic National Parks, A & D Specialist
1649#
1650# The following businesses and organizations in Pangnirtung use Eastern Time:
1651#
1652# Hamlet office, All other businesses, Both schools, Airport operator
1653#
1654# This has made for an interesting situation there, which warranted the news.
1655# No one there that I spoke with seems concerned, or has plans to
1656# change the local methods of keeping time, as it evidently does not
1657# really interfere with any activities or make things difficult locally.
1658# They plan to celebrate New Year's turn-over twice, one hour apart,
1659# so it appears that the situation will last at least that long.
1660# The Nunavut Intergovernmental Affairs hopes that they will "come to
1661# their senses", but the locals evidently don't see any problem with
1662# the current state of affairs.
1663
1664# From Michaela Rodrigue, writing in the
1665# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1666# Nunatsiaq News (1999-11-19)</a>:
1667# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1668# central - or Nunavut time - for government offices, and eastern time
1669# for municipal offices and schools.... Igloolik [was similar but then]
1670# made the switch to central time on Saturday, Nov. 6.
1671
1672# From Paul Eggert (2000-10-02):
1673# Matthews and Vincent (1998) say the following, but we lack histories
1674# for these potential new Zones.
1675#
1676# The Canadian Forces station at Alert uses Eastern Time while the
1677# handful of residents at the Eureka weather station [in the Central
1678# zone] skip daylight savings. Baffin Island, which is crossed by the
1679# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1680# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1681# Central Time and Southampton Island [in the Central zone] is not
1682# required to use daylight savings.
1683
1684# From
1685# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1686# Nunavut now has two time zones
1687# </a> (2000-11-10):
1688# The Nunavut government would allow its employees in Kugluktuk and
1689# Cambridge Bay to operate on central time year-round, putting them
1690# one hour behind the rest of Nunavut for six months during the winter.
1691# At the end of October the two communities had rebelled against
1692# Nunavut's unified time zone, refusing to shift to eastern time with
1693# the rest of the territory for the winter. Cambridge Bay remained on
1694# central time, while Kugluktuk, even farther west, reverted to
1695# mountain time, which they had used before the advent of Nunavut's
1696# unified time zone in 1999.
1697#
1698# From Rives McDow (2001-01-20), quoting the Nunavut government:
1699# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1700
1701# From Paul Eggert (2000-12-04):
1702# Let's just keep track of the official times for now.
1703
1704# From Rives McDow (2001-03-07):
1705# The premier of Nunavut has issued a ministerial statement advising
1706# that effective 2001-04-01, the territory of Nunavut will revert
1707# back to three time zones (mountain, central, and eastern). Of the
1708# cities in Nunavut, Coral Harbor is the only one that I know of that
1709# has said it will not observe dst, staying on EST year round. I'm
1710# checking for more info, and will get back to you if I come up with
1711# more.
1712# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1713
1714# From Gwillim Law (2005-05-21):
1715# According to maps at
1716# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
1717# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
1718# (both dated 2003), and
1719# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
1720# (from a 1998 Canadian Geographic article), the de facto and de jure time
1721# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
1722# round. Using Google, it's easy to find other websites that confirm this.
1723# I wasn't able to find how far back this time regimen goes, but since it
1724# predates the creation of Nunavut, it probably goes back many years....
1725# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
1726#
1727# From Paul Eggert (2005-07-26):
1728# For lack of better information, assume that Southampton Island observed
1729# daylight saving only during wartime.
1730
1731# From Chris Walton (2007-03-01):
1732# ... the community of Resolute (located on Cornwallis Island in
1733# Nunavut) moved from Central Time to Eastern Time last November.
1734# Basically the community did not change its clocks at the end of
1735# daylight saving....
1736# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
1737
1738# From Chris Walton (2007-03-14):
1739# Today I phoned the "hamlet office" to find out what Resolute was doing with
1740# its clocks.
1741#
1742# The individual that answered the phone confirmed that the clocks did not
1743# move at the end of daylight saving on October 29/2006. He also told me that
1744# the clocks did not move this past weekend (March 11/2007)....
1745#
1746# America/Resolute should use the "Canada" Rule up to October 29/2006.
1747# After that it should be fixed on Eastern Standard Time until further notice.
1748
1749# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1750Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1751Rule NT_YK 1918 only - Oct 27 2:00 0 S
1752Rule NT_YK 1919 only - May 25 2:00 1:00 D
1753Rule NT_YK 1919 only - Nov 1 0:00 0 S
1754Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1755Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1756Rule NT_YK 1945 only - Sep 30 2:00 0 S
1757Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1758Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1759Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1760Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
1761Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
1762# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1763# aka Panniqtuuq
1764Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
1765 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1766 -5:00 Canada E%sT 1999 Oct 31 2:00
1767 -6:00 Canada C%sT 2000 Oct 29 2:00
1768 -5:00 Canada E%sT
1769# formerly Frobisher Bay
1770Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
1771 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1772 -6:00 Canada C%sT 2000 Oct 29 2:00
1773 -5:00 Canada E%sT
1774# aka Qausuittuq
1775Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
1776 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1777 -5:00 - EST 2001 Apr 1 3:00
1778 -6:00 Canada C%sT 2006 Oct 29 2:00
1779 -5:00 - EST
1780# aka Kangiqiniq
1781Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
1782 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1783 -5:00 - EST 2001 Apr 1 3:00
1784 -6:00 Canada C%sT
1785# aka Iqaluktuuttiaq
1786Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
1787 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1788 -6:00 Canada C%sT 2000 Oct 29 2:00
1789 -5:00 - EST 2000 Nov 5 0:00
1790 -6:00 - CST 2001 Apr 1 3:00
1791 -7:00 Canada M%sT
1792Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
1793 -7:00 NT_YK M%sT 1980
1794 -7:00 Canada M%sT
1795Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
1796 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1797 -7:00 NT_YK M%sT 1980
1798 -7:00 Canada M%sT
1799Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1800 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1801 -8:00 NT_YK P%sT 1980
1802 -8:00 Canada P%sT
1803Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1804 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1805 -8:00 NT_YK P%sT 1980
1806 -8:00 Canada P%sT
1807
1808
1809###############################################################################
1810
1811# Mexico
1812
1813# From Paul Eggert (2001-03-05):
1814# The Investigation and Analysis Service of the
1815# Mexican Library of Congress (MLoC) has published a
1816# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1817# history of Mexican local time (in Spanish)
1818# </a>.
1819#
1820# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
1821# (In all cases we go with the MLoC.)
1822# S&P report that Baja was at -8:00 in 1922/1923.
1823# S&P say the 1930 transition in Baja was 1930-11-16.
1824# S&P report no DST during summer 1931.
1825# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
1826
1827# From Gwillim Law (2001-02-20):
1828# There are some other discrepancies between the Decrees page and the
1829# tz database. I think they can best be explained by supposing that
1830# the researchers who prepared the Decrees page failed to find some of
1831# the relevant documents.
1832
1833# From Alan Perry (1996-02-15):
1834# A guy from our Mexico subsidiary finally found the Presidential Decree
1835# outlining the timezone changes in Mexico.
1836#
1837# ------------- Begin Forwarded Message -------------
1838#
1839# I finally got my hands on the Official Presidential Decree that sets up the
1840# rules for the DST changes. The rules are:
1841#
1842# 1. The country is divided in 3 timezones:
1843# - Baja California Norte (the Mexico/BajaNorte TZ)
1844# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1845# - The rest of the country (the Mexico/General TZ)
1846#
1847# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1848# at 2:00 AM, the times in each zone are as follows:
1849# BajaNorte: GMT+7
1850# BajaSur: GMT+6
1851# General: GMT+5
1852#
1853# 3. The rest of the year, the times are as follows:
1854# BajaNorte: GMT+8
1855# BajaSur: GMT+7
1856# General: GMT+6
1857#
1858# The Decree was published in Mexico's Official Newspaper on January 4th.
1859#
1860# -------------- End Forwarded Message --------------
1861# From Paul Eggert (1996-06-12):
1862# For an English translation of the decree, see
1863# <a href="http://mexico-travel.com/extra/timezone_eng.html">
1864# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1865# </a>
1866
1867# From Rives McDow (1998-10-08):
1868# The State of Quintana Roo has reverted back to central STD and DST times
1869# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1870
1871# From Rives McDow (2000-01-10):
1872# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1873# zone 5 hours from the International Date Line, and will not observe daylight
1874# savings time so as to stay on the same time zone as the southern part of
1875# Arizona year round.
1876
1877# From Jesper Norgaard, translating
1878# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1879# In Oaxaca, the 55.000 teachers from the Section 22 of the National
1880# Syndicate of Education Workers, refuse to apply daylight saving each
1881# year, so that the more than 10,000 schools work at normal hour the
1882# whole year.
1883
1884# From Gwillim Law (2001-01-19):
1885# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1886# (translated):...
1887# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1888# that Summer Time will be reduced from seven to five months, starting
1889# this year....
1890# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1891# [translated], says "summer time will ... take effect on the first Sunday
1892# in May, and end on the last Sunday of September.
1893
1894# From Arthur David Olson (2001-01-25):
1895# The 2001-01-24 traditional Washington Post contained the page one
1896# story "Timely Issue Divides Mexicans."...
1897# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1898# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1899# Mexico City and its 20 million residents on a different time than
1900# the rest of the country..." In particular, Lopez Obrador would abolish
1901# observation of Daylight Saving Time.
1902
1903# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1904# Official statute published by the Energy Department
1905# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1906# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1907
1908# From Paul Eggert (2001-03-03):
1909#
1910# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1911# James F. Smith writes in today's LA Times
1912# </a>
1913# * Sonora will continue to observe standard time.
1914# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1915# the Federal District will not adopt DST.
1916# * 4 of 16 district leaders announced they'll ignore the decree.
1917# * The decree does not affect federal-controlled facilities including
1918# the airport, banks, hospitals, and schools.
1919#
1920# For now we'll assume that the Federal District will bow to federal rules.
1921
1922# From Jesper Norgaard (2001-04-01):
1923# I found some references to the Mexican application of daylight
1924# saving, which modifies what I had already sent you, stating earlier
1925# that a number of northern Mexican states would go on daylight
1926# saving. The modification reverts this to only cover Baja California
1927# (Norte), while all other states (except Sonora, who has no daylight
1928# saving all year) will follow the original decree of president
1929# Vicente Fox, starting daylight saving May 6, 2001 and ending
1930# September 30, 2001.
1931# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1932# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1933
1934# From Reuters (2001-09-04):
1935# Mexico's Supreme Court on Tuesday declared that daylight savings was
1936# unconstitutional in Mexico City, creating the possibility the
1937# capital will be in a different time zone from the rest of the nation
1938# next year.... The Supreme Court's ruling takes effect at 2:00
1939# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1940# standard time. "This is so residents of the Federal District are not
1941# subject to unexpected time changes," a statement from the court said.
1942
1943# From Jesper Norgaard Welen (2002-03-12):
1944# ... consulting my local grocery store(!) and my coworkers, they all insisted
1945# that a new decision had been made to reinstate US style DST in Mexico....
1946# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1947# confirms this. Sonora as usual is the only state where DST is not applied.
1948
1949# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1950Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1951Rule Mexico 1939 only - Jun 25 0:00 0 S
1952Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1953Rule Mexico 1941 only - Apr 1 0:00 0 S
1954Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
1955Rule Mexico 1944 only - May 1 0:00 0 S
1956Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1957Rule Mexico 1950 only - Jul 30 0:00 0 S
1958Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1959Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1960Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1961Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1962Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1963Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1964# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1965# Quintana Roo
1966Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1967 -6:00 - CST 1981 Dec 23
1968 -5:00 Mexico E%sT 1998 Aug 2 2:00
1969 -6:00 Mexico C%sT
1970# Campeche, Yucatan
1971Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1972 -6:00 - CST 1981 Dec 23
1973 -5:00 - EST 1982 Dec 2
1974 -6:00 Mexico C%sT
1975# Coahuila, Durango, Nuevo Leon, Tamaulipas
1976Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1977 -6:00 - CST 1988
1978 -6:00 US C%sT 1989
1979 -6:00 Mexico C%sT
1980# Central Mexico
1981Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1982 -7:00 - MST 1927 Jun 10 23:00
1983 -6:00 - CST 1930 Nov 15
1984 -7:00 - MST 1931 May 1 23:00
1985 -6:00 - CST 1931 Oct
1986 -7:00 - MST 1932 Apr 1
1987 -6:00 Mexico C%sT 2001 Sep 30 02:00
1988 -6:00 - CST 2002 Feb 20
1989 -6:00 Mexico C%sT
1990# Chihuahua
1991Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1992 -7:00 - MST 1927 Jun 10 23:00
1993 -6:00 - CST 1930 Nov 15
1994 -7:00 - MST 1931 May 1 23:00
1995 -6:00 - CST 1931 Oct
1996 -7:00 - MST 1932 Apr 1
1997 -6:00 - CST 1996
1998 -6:00 Mexico C%sT 1998
1999 -6:00 - CST 1998 Apr Sun>=1 3:00
2000 -7:00 Mexico M%sT
2001# Sonora
2002Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2003 -7:00 - MST 1927 Jun 10 23:00
2004 -6:00 - CST 1930 Nov 15
2005 -7:00 - MST 1931 May 1 23:00
2006 -6:00 - CST 1931 Oct
2007 -7:00 - MST 1932 Apr 1
2008 -6:00 - CST 1942 Apr 24
2009 -7:00 - MST 1949 Jan 14
2010 -8:00 - PST 1970
2011 -7:00 Mexico M%sT 1999
2012 -7:00 - MST
2013# Baja California Sur, Nayarit, Sinaloa
2014Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2015 -7:00 - MST 1927 Jun 10 23:00
2016 -6:00 - CST 1930 Nov 15
2017 -7:00 - MST 1931 May 1 23:00
2018 -6:00 - CST 1931 Oct
2019 -7:00 - MST 1932 Apr 1
2020 -6:00 - CST 1942 Apr 24
2021 -7:00 - MST 1949 Jan 14
2022 -8:00 - PST 1970
2023 -7:00 Mexico M%sT
2024# Baja California
2025Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2026 -7:00 - MST 1924
2027 -8:00 - PST 1927 Jun 10 23:00
2028 -7:00 - MST 1930 Nov 15
2029 -8:00 - PST 1931 Apr 1
2030 -8:00 1:00 PDT 1931 Sep 30
2031 -8:00 - PST 1942 Apr 24
2032 -8:00 1:00 PWT 1945 Aug 14 23:00u
2033 -8:00 1:00 PPT 1945 Nov 12 # Peace
2034 -8:00 - PST 1948 Apr 5
2035 -8:00 1:00 PDT 1949 Jan 14
2036 -8:00 - PST 1954
2037 -8:00 CA P%sT 1961
2038 -8:00 - PST 1976
2039 -8:00 US P%sT 1996
2040 -8:00 Mexico P%sT 2001
2041 -8:00 US P%sT 2002 Feb 20
2042 -8:00 Mexico P%sT
2043# From Paul Eggert (2006-03-22):
2044# Formerly there was an America/Ensenada zone, which differed from
2045# America/Tijuana only in that it did not observe DST from 1976
2046# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2047# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2048# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2049# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2050# DST-observance was a town-by-town matter back then. This concerns
2051# data after 1970 so most likely there should be at least one Zone
2052# other than America/Tijuana for Baja, but it's not clear yet what its
2053# name or contents should be.
2054#
2055# Revillagigedo Is
2056# no information
2057
2058###############################################################################
2059
2060# Anguilla
2061# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2062Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2063 -4:00 - AST
2064
2065# Antigua and Barbuda
2066# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2067Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2068 -5:00 - EST 1951
2069 -4:00 - AST
2070
2071# Bahamas
2072#
2073# From Sue Williams (2006-12-07):
2074# The Bahamas announced about a month ago that they plan to change their DST
2075# rules to sync with the U.S. starting in 2007....
2076# http://www.jonesbahamas.com/?c=45&a=10412
2077
2078# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2# <pre>
3
4# also includes Central America and the Caribbean
5
6# This data is by no means authoritative; if you think you know better,
7# go ahead and edit the file (and please send any changes to
8# tz@elsie.nci.nih.gov for general use in the future).
9
10# From Paul Eggert (1999-03-22):
11# A reliable and entertaining source about time zones is
12# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
13
14###############################################################################
15
16# United States
17
18# From Paul Eggert (1999-03-31):
19# Howse writes (pp 121-125) that time zones were invented by
20# Professor Charles Ferdinand Dowd (1825-1904),
21# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
22# His pamphlet ``A System of National Time for Railroads'' (1870)
23# was the result of his proposals at the Convention of Railroad Trunk Lines
24# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
25# but in 1872-05 he moved the proposed origin to Greenwich.
26# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
27# and the most of the country soon followed suit.
28
29# From Paul Eggert (2005-04-16):
30# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
31# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
32
33# From Paul Eggert (2006-03-22):
34# A good source for time zone historical data in the US is
35# Thomas G. Shanks, The American Atlas (5th edition),
36# San Diego: ACS Publications, Inc. (1991).
37# Make sure you have the errata sheet; the book is somewhat useless without it.
38# It is the source for most of the pre-1991 US entries below.
39
40# From Paul Eggert (2001-03-06):
41# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
42# in his whimsical essay ``An Economical Project for Diminishing the Cost
43# of Light'' published in the Journal de Paris (1784-04-26).
44# Not everyone is happy with the results:
45#
46# I don't really care how time is reckoned so long as there is some
47# agreement about it, but I object to being told that I am saving
48# daylight when my reason tells me that I am doing nothing of the kind.
49# I even object to the implication that I am wasting something
50# valuable if I stay in bed after the sun has risen. As an admirer
51# of moonlight I resent the bossy insistence of those who want to
52# reduce my time for enjoying it. At the back of the Daylight Saving
53# scheme I detect the bony, blue-fingered hand of Puritanism, eager
54# to push people into bed earlier, and get them up earlier, to make
55# them healthy, wealthy and wise in spite of themselves.
56#
57# -- Robertson Davies, The diary of Samuel Marchbanks,
58# Clarke, Irwin (1947), XIX, Sunday
59#
60# For more about the first ten years of DST in the United States, see
61# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
62# Ten years of daylight saving from the Pittsburgh standpoint
63# (Carnegie Library of Pittsburgh, 1927)</a>.
64#
65# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
66# However, DST was imposed by the Standard Time Act of 1918, which
67# was the first nationwide legal time standard, and apparently
68# time was just called "Standard Time" or "Daylight Saving Time".
69
70# From Arthur David Olson:
71# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
72# See, for example, the front page of the Saturday, 1974-10-26
73# and Sunday, 1974-10-27 editions of the Washington Post.
74
75# From Arthur David Olson:
76# Before the Uniform Time Act of 1966 took effect in 1967, observance of
77# Daylight Saving Time in the US was by local option, except during wartime.
78
79# From Arthur David Olson (2000-09-25):
80# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
81# In the introduction, Oboler spoke of "Eastern Peace Time."
82# An AltaVista search turned up
83# <a href="http://rowayton.org/rhs/hstaug45.html">:
84# "When the time is announced over the radio now, it is 'Eastern Peace
85# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
86# </a> (August 1945) by way of confirmation.
87
88# From Joseph Gallant citing
89# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
90# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
91# to switch to London for Attlee's address, but the American people
92# never got to hear his speech live. According to one press account,
93# CBS' Bob Trout was first to announce the word of Japan's surrender,
94# but a few seconds later, NBC, ABC and Mutual also flashed the word
95# of surrender, all of whom interrupting the bells of Big Ben in
96# London which were to precede Mr. Attlee's speech.
97
98# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
99# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
100#
101# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
102# Any announcement from Asia would reach St. John's New York newsroom on a
103# wire service teletype machine, which had prescribed signals for major news.
104# Associated Press, for example, would ring five bells before spewing out
105# typed copy of an important story, and 10 bells for news "of transcendental
106# importance."
107#
108# On Aug. 14, stalling while talking steadily into the NBC networks' open
109# microphone, St. John heard five bells and waited only to hear a sixth bell,
110# before announcing confidently: "Ladies and gentlemen, World War II is over.
111# The Japanese have agreed to our surrender terms."
112#
113# He had scored a 20-second scoop on other broadcasters.
114
115# From Arthur David Olson (2005-08-22):
116# Paul has been careful to use the "US" rules only in those locations
117# that are part of the United States; this reflects the real scope of
118# U.S. government action. So even though the "US" rules have changed
119# in the latest release, other countries won't be affected.
120
121# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
122Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
123Rule US 1918 1919 - Oct lastSun 2:00 0 S
124Rule US 1942 only - Feb 9 2:00 1:00 W # War
125Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
126Rule US 1945 only - Sep 30 2:00 0 S
127Rule US 1967 2006 - Oct lastSun 2:00 0 S
128Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
129Rule US 1974 only - Jan 6 2:00 1:00 D
130Rule US 1975 only - Feb 23 2:00 1:00 D
131Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
132Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
133Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
134Rule US 2007 max - Nov Sun>=1 2:00 0 S
135
136# From Arthur David Olson, 2005-12-19
137# We generate the files specified below to guard against old files with
138# obsolete information being left in the time zone binary directory.
139# We limit the list to names that have appeared in previous versions of
140# this time zone package.
141# We do these as separate Zones rather than as Links to avoid problems if
142# a particular place changes whether it observes DST.
143# We put these specifications here in the northamerica file both to
144# increase the chances that they'll actually get compiled and to
145# avoid the need to duplicate the US rules in another file.
146
147# Zone NAME GMTOFF RULES FORMAT [UNTIL]
148Zone EST -5:00 - EST
149Zone MST -7:00 - MST
150Zone HST -10:00 - HST
151Zone EST5EDT -5:00 US E%sT
152Zone CST6CDT -6:00 US C%sT
153Zone MST7MDT -7:00 US M%sT
154Zone PST8PDT -8:00 US P%sT
155
156# From Bob Devine (1988-01-28):
157# ...Alaska (and Hawaii) had the timezone names changed in 1967.
158# old new
159# Pacific Standard Time(PST) -same-
160# Yukon Standard Time(YST) -same-
161# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
162# Nome Standard Time (NT) Bering Standard Time (BST)
163#
164# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
165# The YST zone now covers nearly all of the state, AHST just part
166# of the Aleutian islands. No DST.
167
168# From Paul Eggert (1995-12-19):
169# The tables below use `NST', not `NT', for Nome Standard Time.
170# I invented `CAWT' for Central Alaska War Time.
171
172# From U. S. Naval Observatory (1989-01-19):
173# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
174# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
175# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
176# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
177# USA MOUNTAIN 7 H BEHIND UTC DENVER
178# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
179# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
180# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
181# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
182# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
183# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
184# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
185# USA HAWAII 10 H BEHIND UTC
186# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
187
188# From Arthur David Olson (1989-01-21):
189# The above dates are for 1988.
190# Note the "AKST" and "AKDT" abbreviations, the claim that there's
191# no DST in Samoa, and the claim that there is DST in Alaska and the
192# Aleutians.
193
194# From Arthur David Olson (1988-02-13):
195# Legal standard time zone names, from United States Code (1982 Edition and
196# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
197# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
198# took effect), as explained in sections 263 and 261:
199# (none)
200# United States standard eastern time
201# United States standard mountain time
202# United States standard central time
203# United States standard Pacific time
204# (none)
205# United States standard Alaska time
206# (none)
207# Next, names from 1967-04-01 until 1983-11-30 (the date for
208# public law 98-181):
209# Atlantic standard time
210# eastern standard time
211# central standard time
212# mountain standard time
213# Pacific standard time
214# Yukon standard time
215# Alaska-Hawaii standard time
216# Bering standard time
217# And after 1983-11-30:
218# Atlantic standard time
219# eastern standard time
220# central standard time
221# mountain standard time
222# Pacific standard time
223# Alaska standard time
224# Hawaii-Aleutian standard time
225# Samoa standard time
226# The law doesn't give abbreviations.
227#
228# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
229# Public law 106-564 (2000-12-23) introduced the abbreviation
230# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
231# See the file "australasia".
232
233# From Arthur David Olson, 2005-08-09
234# The following was signed into law on 2005-08-08.
235#
236# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
237# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
238# U.S.C. 260a(a)) is amended--
239# (1) by striking `first Sunday of April' and inserting `second
240# Sunday of March'; and
241# (2) by striking `last Sunday of October' and inserting `first
242# Sunday of November'.
243# (b) Effective Date- Subsection (a) shall take effect 1 year after the
244# date of enactment of this Act or March 1, 2007, whichever is later.
245# (c) Report to Congress- Not later than 9 months after the effective
246# date stated in subsection (b), the Secretary shall report to Congress
247# on the impact of this section on energy consumption in the United
248# States.
249# (d) Right to Revert- Congress retains the right to revert the
250# Daylight Saving Time back to the 2005 time schedules once the
251# Department study is complete.
252
253# US eastern time, represented by New York
254
255# Connecticut, Delaware, District of Columbia, most of Florida,
256# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
257# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
258# New Hampshire, New Jersey, New York, North Carolina, Ohio,
259# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
260# Vermont, Virginia, West Virginia
261
262# From Dave Cantor (2004-11-02):
263# Early this summer I had the occasion to visit the Mount Washington
264# Observatory weather station atop (of course!) Mount Washington [, NH]....
265# One of the staff members said that the station was on Eastern Standard Time
266# and didn't change their clocks for Daylight Saving ... so that their
267# reports will always have times which are 5 hours behind UTC.
268
269# From Paul Eggert (2005-08-26):
270# According to today's Huntsville Times
271# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1>
272# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
273# in Russell County, Lanett in Chambers County and some towns in Lee County,
274# set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
275# Roberts, city administrator in Phenix City. as saying "We are in the Central
276# time zone, but we do go by the Eastern time zone because so many people work
277# in Columbus."
278
279# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
280Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
281Rule NYC 1920 only - Oct lastSun 2:00 0 S
282Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
283Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
284Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
285# Zone NAME GMTOFF RULES FORMAT [UNTIL]
286Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
287 -5:00 US E%sT 1920
288 -5:00 NYC E%sT 1942
289 -5:00 US E%sT 1946
290 -5:00 NYC E%sT 1967
291 -5:00 US E%sT
292
293# US central time, represented by Chicago
294
295# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
296# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
297# Washington counties), Illinois, western Indiana
298# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
299# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
300# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
301# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
302# western Tennessee, most of Texas, Wisconsin
303
304# From Larry M. Smith (2006-04-26) re Wisconsin:
305# http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
306# is currently enforced at the 01:00 time of change. Because the local
307# "bar time" in the state corresponds to 02:00, a number of citations
308# are issued for the "sale of class 'B' alcohol after prohibited
309# hours" within the deviated hour of this change every year....
310#
311# From Douglas R. Bomberg (2007-03-12):
312# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
313# Statue 175 closer in synch with the US Congress' intent....
314# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
315
316# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
317Rule Chicago 1920 only - Jun 13 2:00 1:00 D
318Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
319Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
320Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
321Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
322Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
323# Zone NAME GMTOFF RULES FORMAT [UNTIL]
324Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
325 -6:00 US C%sT 1920
326 -6:00 Chicago C%sT 1936 Mar 1 2:00
327 -5:00 - EST 1936 Nov 15 2:00
328 -6:00 Chicago C%sT 1942
329 -6:00 US C%sT 1946
330 -6:00 Chicago C%sT 1967
331 -6:00 US C%sT
332# Oliver County, ND switched from mountain to central time on 1992-10-25.
333Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
334 -7:00 US M%sT 1992 Oct 25 02:00
335 -6:00 US C%sT
336# Morton County, ND, switched from mountain to central time on
337# 2003-10-26, except for the area around Mandan which was already central time.
338# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
339# Officially this switch also included part of Sioux County, and
340# Jones, Mellette, and Todd Counties in South Dakota;
341# but in practice these other counties were already observing central time.
342# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
343Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
344 -7:00 US M%sT 2003 Oct 26 02:00
345 -6:00 US C%sT
346
347# US mountain time, represented by Denver
348#
349# Colorado, far western Kansas, Montana, western
350# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
351# New Mexico, southwestern North Dakota,
352# western South Dakota, far western Texas (El Paso County, Hudspeth County,
353# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
354#
355# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
356Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
357Rule Denver 1920 only - Oct lastSun 2:00 0 S
358Rule Denver 1921 only - May 22 2:00 0 S
359Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
360Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
361# Zone NAME GMTOFF RULES FORMAT [UNTIL]
362Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
363 -7:00 US M%sT 1920
364 -7:00 Denver M%sT 1942
365 -7:00 US M%sT 1946
366 -7:00 Denver M%sT 1967
367 -7:00 US M%sT
368
369# US Pacific time, represented by Los Angeles
370#
371# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
372# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
373# and the northern three-quarters of Idaho county),
374# most of Nevada, most of Oregon, and Washington
375#
376# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
377Rule CA 1948 only - Mar 14 2:00 1:00 D
378Rule CA 1949 only - Jan 1 2:00 0 S
379Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
380Rule CA 1950 1961 - Sep lastSun 2:00 0 S
381Rule CA 1962 1966 - Oct lastSun 2:00 0 S
382# Zone NAME GMTOFF RULES FORMAT [UNTIL]
383Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
384 -8:00 US P%sT 1946
385 -8:00 CA P%sT 1967
386 -8:00 US P%sT
387
388# Alaska
389# AK%sT is the modern abbreviation for -9:00 per USNO.
390#
391# From Paul Eggert (2001-05-30):
392# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
393# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
394# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
395# also a Friday. Include only the time zone part of this transition,
396# ignoring the switch from Julian to Gregorian, since we can't represent
397# the Julian calendar.
398#
399# As far as we know, none of the exact locations mentioned below were
400# permanently inhabited in 1867 by anyone using either calendar.
401# (Yakutat was colonized by the Russians in 1799, but the settlement
402# was destroyed in 1805 by a Yakutat-kon war party.) However, there
403# were nearby inhabitants in some cases and for our purposes perhaps
404# it's best to simply use the official transition.
405#
406# Zone NAME GMTOFF RULES FORMAT [UNTIL]
407Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
408 -8:57:41 - LMT 1900 Aug 20 12:00
409 -8:00 - PST 1942
410 -8:00 US P%sT 1946
411 -8:00 - PST 1969
412 -8:00 US P%sT 1983 Oct 30 2:00
413 -9:00 US Y%sT 1983 Nov 30
414 -9:00 US AK%sT
415Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
416 -9:18:55 - LMT 1900 Aug 20 12:00
417 -9:00 - YST 1942
418 -9:00 US Y%sT 1946
419 -9:00 - YST 1969
420 -9:00 US Y%sT 1983 Nov 30
421 -9:00 US AK%sT
422Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
423 -9:59:36 - LMT 1900 Aug 20 12:00
424 -10:00 - CAT 1942
425 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
426 -10:00 US CAT/CAPT 1946 # Peace
427 -10:00 - CAT 1967 Apr
428 -10:00 - AHST 1969
429 -10:00 US AH%sT 1983 Oct 30 2:00
430 -9:00 US Y%sT 1983 Nov 30
431 -9:00 US AK%sT
432Zone America/Nome 12:58:21 - LMT 1867 Oct 18
433 -11:01:38 - LMT 1900 Aug 20 12:00
434 -11:00 - NST 1942
435 -11:00 US N%sT 1946
436 -11:00 - NST 1967 Apr
437 -11:00 - BST 1969
438 -11:00 US B%sT 1983 Oct 30 2:00
439 -9:00 US Y%sT 1983 Nov 30
440 -9:00 US AK%sT
441Zone America/Adak 12:13:21 - LMT 1867 Oct 18
442 -11:46:38 - LMT 1900 Aug 20 12:00
443 -11:00 - NST 1942
444 -11:00 US N%sT 1946
445 -11:00 - NST 1967 Apr
446 -11:00 - BST 1969
447 -11:00 US B%sT 1983 Oct 30 2:00
448 -10:00 US AH%sT 1983 Nov 30
449 -10:00 US HA%sT
450# The following switches don't quite make our 1970 cutoff.
451#
452# Shanks writes that part of southwest Alaska (e.g. Aniak)
453# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
454# and another part (e.g. Akiak) made the same switch five weeks later.
455#
456# From David Flater (2004-11-09):
457# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
458# Historic Preservation Commission, provided this information, which
459# suggests that Unalaska deviated from statutory time from early 1967
460# possibly until 1983:
461#
462# Minutes of the Unalaska City Council Meeting, January 10, 1967:
463# "Except for St. Paul and Akutan, Unalaska is the only important
464# location not on Alaska Standard Time. The following resolution was
465# made by William Robinson and seconded by Henry Swanson: Be it
466# resolved that the City of Unalaska hereby goes to Alaska Standard
467# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
468# January 14, Alaska Standard Time.) This resolution was passed with
469# three votes for and one against."
470
471# Hawaii
472#
473# From Arthur David Olson:
474# And then there's Hawaii.
475# DST was observed for one day in 1933;
476# standard time was changed by half an hour in 1947;
477# it's always standard as of 1986.
478#
479# From Paul Eggert:
480# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
481#
482Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
483 -10:30 - HST 1933 Apr 30 2:00
484 -10:30 1:00 HDT 1933 May 21 2:00
485 -10:30 US H%sT 1947 Jun 8 2:00
486 -10:00 - HST
487
488# Now we turn to US areas that have diverged from the consensus since 1970.
489
490# Arizona mostly uses MST.
491
492# From Paul Eggert (2002-10-20):
493#
494# The information in the rest of this paragraph is derived from the
495# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
496# Daylight Saving Time web page (2002-01-23)</a> maintained by the
497# Arizona State Library, Archives and Public Records.
498# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
499# time, but by federal law railroads, airlines, bus lines, military
500# personnel, and some engaged in interstate commerce continued to
501# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
502# Gazette says that was the date the law changed, and that 04-01 was
503# the date the state's clocks would change. In 1945 the State of
504# Arizona used standard time all year, again with exceptions only as
505# mandated by federal law. Arizona observed DST in 1967, but Arizona
506# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
507#
508# Shanks says the 1944 experiment came to an end on 1944-03-17.
509# Go with the Arizona State Library instead.
510
511Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
512 -7:00 US M%sT 1944 Jan 1 00:01
513 -7:00 - MST 1944 Apr 1 00:01
514 -7:00 US M%sT 1944 Oct 1 00:01
515 -7:00 - MST 1967
516 -7:00 US M%sT 1968 Mar 21
517 -7:00 - MST
518# From Arthur David Olson (1988-02-13):
519# A writer from the Inter Tribal Council of Arizona, Inc.,
520# notes in private correspondence dated 1987-12-28 that "Presently, only the
521# Navajo Nation participates in the Daylight Saving Time policy, due to its
522# large size and location in three states." (The "only" means that other
523# tribal nations don't use DST.)
524
525Link America/Denver America/Shiprock
526
527# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
528# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
529# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
530# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
531# Teton, Twin Falls, Valley, Washington counties, and the southern
532# quarter of Idaho county) and eastern Oregon (most of Malheur County)
533# switched four weeks late in 1974.
534#
535# Zone NAME GMTOFF RULES FORMAT [UNTIL]
536Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
537 -8:00 US P%sT 1923 May 13 2:00
538 -7:00 US M%sT 1974
539 -7:00 - MST 1974 Feb 3 2:00
540 -7:00 US M%sT
541
542# Indiana
543#
544# For a map of Indiana's time zone regions, see:
545# <a href="http://www.mccsc.edu/time.html">
546# What time is it in Indiana?
547# </a> (2006-03-01)
548#
549# From Paul Eggert (2007-08-17):
550# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
551# with the following exceptions:
552#
553# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
554# Vandenburgh, and Warrick counties have been like America/Chicago.
555#
556# - Dearborn and Ohio counties have been like America/New_York.
557#
558# - Clark, Floyd, and Harrison counties have been like
559# America/Kentucky/Louisville.
560#
561# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
562# and Switzerland counties have their own time zone histories as noted below.
563#
564# Shanks partitioned Indiana into 345 regions, each with its own time history,
565# and wrote ``Even newspaper reports present contradictory information.''
566# Those Hoosiers! Such a flighty and changeable people!
567# Fortunately, most of the complexity occurred before our cutoff date of 1970.
568#
569# Other than Indianapolis, the Indiana place names are so nondescript
570# that they would be ambiguous if we left them at the `America' level.
571# So we reluctantly put them all in a subdirectory `America/Indiana'.
572
573# From Paul Eggert (2005-08-16):
574# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
575
576# From Nathan Stratton Treadway (2006-03-30):
577# http://www.dot.gov/affairs/dot0406.htm [3705 B]
578# From Deborah Goldsmith (2006-01-18):
579# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
580# From Paul Eggert (2006-01-20):
581# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
582# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
583# Eastern Time Zone to the Central Time Zone.... The effective date of
584# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
585# changeover date from standard time to Daylight Saving Time."
586# Strictly speaking, this means the affected counties will change their
587# clocks twice that night, but this obviously is in error. The intent
588# is that 01:59:59 EST be followed by 02:00:00 CDT.
589
590# From Gwillim Law (2007-02-10):
591# The Associated Press has been reporting that Pulaski County, Indiana is
592# going to switch from Central to Eastern Time on March 11, 2007....
593# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
594
595# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
596Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
597Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
598Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
599# Zone NAME GMTOFF RULES FORMAT [UNTIL]
600Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
601 -6:00 US C%sT 1920
602 -6:00 Indianapolis C%sT 1942
603 -6:00 US C%sT 1946
604 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
605 -5:00 - EST 1957 Sep 29 2:00
606 -6:00 - CST 1958 Apr 27 2:00
607 -5:00 - EST 1969
608 -5:00 US E%sT 1971
609 -5:00 - EST 2006
610 -5:00 US E%sT
611#
612# Eastern Crawford County, Indiana, left its clocks alone in 1974,
613# as well as from 1976 through 2005.
614# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
615Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
616Rule Marengo 1951 only - Sep lastSun 2:00 0 S
617Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
618Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
619# Zone NAME GMTOFF RULES FORMAT [UNTIL]
620Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
621 -6:00 US C%sT 1951
622 -6:00 Marengo C%sT 1961 Apr 30 2:00
623 -5:00 - EST 1969
624 -5:00 US E%sT 1974 Jan 6 2:00
625 -6:00 1:00 CDT 1974 Oct 27 2:00
626 -5:00 US E%sT 1976
627 -5:00 - EST 2006
628 -5:00 US E%sT
629#
630# Daviess, Dubois, Knox, and Martin Counties, Indiana,
631# switched from eastern to central time in April 2006, then switched back
632# in November 2007.
633# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
634Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
635Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
636Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
637Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
638Rule Vincennes 1955 only - May 1 0:00 1:00 D
639Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
640Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
641Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
642Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
644Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
645 -6:00 US C%sT 1946
646 -6:00 Vincennes C%sT 1964 Apr 26 2:00
647 -5:00 - EST 1969
648 -5:00 US E%sT 1971
649 -5:00 - EST 2006 Apr 2 2:00
650 -6:00 US C%sT 2007 Nov 4 2:00
651 -5:00 US E%sT
652#
653# Perry County, Indiana, switched from eastern to central time in April 2006.
654# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
655Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
656Rule Perry 1946 only - Sep lastSun 2:00 0 S
657Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
658Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
659Rule Perry 1955 only - May 1 0:00 1:00 D
660Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
661Rule Perry 1960 only - Oct lastSun 2:00 0 S
662Rule Perry 1961 only - Sep lastSun 2:00 0 S
663Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
665Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
666 -6:00 US C%sT 1946
667 -6:00 Perry C%sT 1964 Apr 26 2:00
668 -5:00 - EST 1969
669 -5:00 US E%sT 1971
670 -5:00 - EST 2006 Apr 2 2:00
671 -6:00 US C%sT
672#
673# Pike County, Indiana moved from central to eastern time in 1977,
674# then switched back in 2006, then switched back again in 2007.
675# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
676Rule Pike 1955 only - May 1 0:00 1:00 D
677Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
678Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
679Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
680# Zone NAME GMTOFF RULES FORMAT [UNTIL]
681Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
682 -6:00 US C%sT 1955
683 -6:00 Pike C%sT 1965 Apr 25 2:00
684 -5:00 - EST 1966 Oct 30 2:00
685 -6:00 US C%sT 1977 Oct 30 2:00
686 -5:00 - EST 2006 Apr 2 2:00
687 -6:00 US C%sT 2007 Nov 4 2:00
688 -5:00 US E%sT
689#
690# Starke County, Indiana moved from central to eastern time in 1991,
691# then switched back in 2006.
692# From Arthur David Olson (1991-10-28):
693# An article on page A3 of the Sunday, 1991-10-27 Washington Post
694# notes that Starke County switched from Central time to Eastern time as of
695# 1991-10-27.
696# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
697Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
698Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
699Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
700Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
701Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
702# Zone NAME GMTOFF RULES FORMAT [UNTIL]
703Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
704 -6:00 US C%sT 1947
705 -6:00 Starke C%sT 1962 Apr 29 2:00
706 -5:00 - EST 1963 Oct 27 2:00
707 -6:00 US C%sT 1991 Oct 27 2:00
708 -5:00 - EST 2006 Apr 2 2:00
709 -6:00 US C%sT
710#
711# Pulaski County, Indiana, switched from eastern to central time in
712# April 2006 and then switched back in March 2007.
713# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
714Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
715Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
716Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
717Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
718# Zone NAME GMTOFF RULES FORMAT [UNTIL]
719Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
720 -6:00 US C%sT 1946
721 -6:00 Pulaski C%sT 1961 Apr 30 2:00
722 -5:00 - EST 1969
723 -5:00 US E%sT 1971
724 -5:00 - EST 2006 Apr 2 2:00
725 -6:00 US C%sT 2007 Mar 11 2:00
726 -5:00 US E%sT
727#
728# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
729# Zone NAME GMTOFF RULES FORMAT [UNTIL]
730Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
731 -6:00 US C%sT 1954 Apr 25 2:00
732 -5:00 - EST 1969
733 -5:00 US E%sT 1973
734 -5:00 - EST 2006
735 -5:00 US E%sT
736
737# Part of Kentucky left its clocks alone in 1974.
738# This also includes Clark, Floyd, and Harrison counties in Indiana.
739# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
740Rule Louisville 1921 only - May 1 2:00 1:00 D
741Rule Louisville 1921 only - Sep 1 2:00 0 S
742Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
743Rule Louisville 1941 only - Sep lastSun 2:00 0 S
744Rule Louisville 1946 only - Jun 2 2:00 0 S
745Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
746Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
747# Zone NAME GMTOFF RULES FORMAT [UNTIL]
748Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
749 -6:00 US C%sT 1921
750 -6:00 Louisville C%sT 1942
751 -6:00 US C%sT 1946
752 -6:00 Louisville C%sT 1961 Jul 23 2:00
753 -5:00 - EST 1968
754 -5:00 US E%sT 1974 Jan 6 2:00
755 -6:00 1:00 CDT 1974 Oct 27 2:00
756 -5:00 US E%sT
757#
758# Wayne County, Kentucky
759#
760# From
761# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
762# Lake Cumberland LIFE
763# </a> (1999-01-29) via WKYM-101.7:
764# Clinton County has joined Wayne County in asking the DoT to change from
765# the Central to the Eastern time zone.... The Wayne County government made
766# the same request in December. And while Russell County officials have not
767# taken action, the majority of respondents to a poll conducted there in
768# August indicated they would like to change to "fast time" also.
769# The three Lake Cumberland counties are the farthest east of any U.S.
770# location in the Central time zone.
771#
772# From Rich Wales (2000-08-29):
773# After prolonged debate, and despite continuing deep differences of opinion,
774# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
775# (-0500) time. They won't "fall back" this year. See Sara Shipley,
776# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
777#
778# From Paul Eggert (2001-07-16):
779# The final rule was published in the
780# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
781# Federal Register 65, 160 (2000-08-17), page 50154-50158.
782# </a>
783#
784Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
785 -6:00 US C%sT 1946
786 -6:00 - CST 1968
787 -6:00 US C%sT 2000 Oct 29 2:00
788 -5:00 US E%sT
789
790
791# From Rives McDow (2000-08-30):
792# Here ... are all the changes in the US since 1985.
793# Kearny County, KS (put all of county on central;
794# previously split between MST and CST) ... 1990-10
795# Starke County, IN (from CST to EST) ... 1991-10
796# Oliver County, ND (from MST to CST) ... 1992-10
797# West Wendover, NV (from PST TO MST) ... 1999-10
798# Wayne County, KY (from CST to EST) ... 2000-10
799#
800# From Paul Eggert (2001-07-17):
801# We don't know where the line used to be within Kearny County, KS,
802# so omit that change for now.
803# See America/Indiana/Knox for the Starke County, IN change.
804# See America/North_Dakota/Center for the Oliver County, ND change.
805# West Wendover, NV officially switched from Pacific to mountain time on
806# 1999-10-31. See the
807# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
808# Federal Register 64, 203 (1999-10-21), page 56705-56707.
809# </a>
810# However, the Federal Register says that West Wendover already operated
811# on mountain time, and the rule merely made this official;
812# hence a separate tz entry is not needed.
813
814# Michigan
815#
816# From Bob Devine (1988-01-28):
817# Michigan didn't observe DST from 1968 to 1973.
818#
819# From Paul Eggert (1999-03-31):
820# Shanks writes that Michigan started using standard time on 1885-09-18,
821# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
822# that Detroit kept
823#
824# local time until 1900 when the City Council decreed that clocks should
825# be put back twenty-eight minutes to Central Standard Time. Half the
826# city obeyed, half refused. After considerable debate, the decision
827# was rescinded and the city reverted to Sun time. A derisive offer to
828# erect a sundial in front of the city hall was referred to the
829# Committee on Sewers. Then, in 1905, Central time was adopted
830# by city vote.
831#
832# This story is too entertaining to be false, so go with Howse over Shanks.
833#
834# From Paul Eggert (2001-03-06):
835# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
836# one hour in 1914.'' This change is not in Shanks. We have no more
837# info, so omit this for now.
838#
839# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
840# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
841Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
842Rule Detroit 1948 only - Sep lastSun 2:00 0 S
843Rule Detroit 1967 only - Jun 14 2:00 1:00 D
844Rule Detroit 1967 only - Oct lastSun 2:00 0 S
845# Zone NAME GMTOFF RULES FORMAT [UNTIL]
846Zone America/Detroit -5:32:11 - LMT 1905
847 -6:00 - CST 1915 May 15 2:00
848 -5:00 - EST 1942
849 -5:00 US E%sT 1946
850 -5:00 Detroit E%sT 1973
851 -5:00 US E%sT 1975
852 -5:00 - EST 1975 Apr 27 2:00
853 -5:00 US E%sT
854#
855# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
856# switched from EST to CST/CDT in 1973.
857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
858Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
859Rule Menominee 1946 only - Sep lastSun 2:00 0 S
860Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
861Rule Menominee 1966 only - Oct lastSun 2:00 0 S
862# Zone NAME GMTOFF RULES FORMAT [UNTIL]
863Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
864 -6:00 US C%sT 1946
865 -6:00 Menominee C%sT 1969 Apr 27 2:00
866 -5:00 - EST 1973 Apr 29 2:00
867 -6:00 US C%sT
868
869# Navassa
870# administered by the US Fish and Wildlife Service
871# claimed by US under the provisions of the 1856 Guano Islands Act
872# also claimed by Haiti
873# occupied 1857/1900 by the Navassa Phosphate Co
874# US lighthouse 1917/1996-09
875# currently uninhabited
876# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
877# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
878# Jimmy Skaggs, _The Great Guano Rush_ (1994).
879
880################################################################################
881
882
883# From Paul Eggert (2006-03-22):
884# A good source for time zone historical data outside the U.S. is
885# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
886# San Diego: ACS Publications, Inc. (2003).
887#
888# Gwillim Law writes that a good source
889# for recent time zone data is the International Air Transport
890# Association's Standard Schedules Information Manual (IATA SSIM),
891# published semiannually. Law sent in several helpful summaries
892# of the IATA's data after 1990.
893#
894# Except where otherwise noted, Shanks & Pottenger is the source for
895# entries through 1990, and IATA SSIM is the source for entries afterwards.
896#
897# Other sources occasionally used include:
898#
899# Edward W. Whitman, World Time Differences,
900# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
901# which I found in the UCLA library.
902#
903# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
904# William Willett, The Waste of Daylight, 19th edition
905# </a> (1914-03)
906#
907# See the `europe' file for Greenland.
908
909# Canada
910
911# From Alain LaBont<e'> (1994-11-14):
912# I post here the time zone abbreviations standardized in Canada
913# for both English and French in the CAN/CSA-Z234.4-89 standard....
914#
915# UTC Standard time Daylight savings time
916# offset French English French English
917# -2:30 - - HAT NDT
918# -3 - - HAA ADT
919# -3:30 HNT NST - -
920# -4 HNA AST HAE EDT
921# -5 HNE EST HAC CDT
922# -6 HNC CST HAR MDT
923# -7 HNR MST HAP PDT
924# -8 HNP PST HAY YDT
925# -9 HNY YST - -
926#
927# HN: Heure Normale ST: Standard Time
928# HA: Heure Avanc<e'>e DT: Daylight saving Time
929#
930# A: de l'Atlantique Atlantic
931# C: du Centre Central
932# E: de l'Est Eastern
933# M: Mountain
934# N: Newfoundland
935# P: du Pacifique Pacific
936# R: des Rocheuses
937# T: de Terre-Neuve
938# Y: du Yukon Yukon
939#
940# From Paul Eggert (1994-11-22):
941# Alas, this sort of thing must be handled by localization software.
942
943# Unless otherwise specified, the data for Canada are all from Shanks
944# & Pottenger.
945
946# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
947# 2007-03-01):
948# The British Columbia government announced yesterday that it will
949# adjust daylight savings next year to align with changes in the
950# U.S. and the rest of Canada....
951# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
952# ...
953# Nova Scotia
954# Daylight saving time will be extended by four weeks starting in 2007....
955# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
956#
957# [For New Brunswick] the new legislation dictates that the time change is to
958# be done at 02:00 instead of 00:01.
959# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
960# ...
961# Manitoba has traditionally changed the clock every fall at 03:00.
962# As of 2006, the transition is to take place one hour earlier at 02:00.
963# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
964# ...
965# [Alberta, Ontario, Quebec] will follow US rules.
966# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
967# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
968# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
969# ...
970# P.E.I. will follow US rules....
971# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
972# ...
973# Province of Newfoundland and Labrador....
974# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
975# ...
976# Yukon
977# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
978# ...
979# N.W.T. will follow US rules. Whoever maintains the government web site
980# does not seem to believe in bookmarks. To see the news release, click the
981# following link and search for "Daylight Savings Time Change". Press the
982# "Daylight Savings Time Change" link; it will fire off a popup using
983# JavaScript.
984# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
985# ...
986# Nunavut
987# An amendment to the Interpretation Act was registered on February 19/2007....
988# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
989
990# From Paul Eggert (2006-04-25):
991# H. David Matthews and Mary Vincent's map
992# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
993# "It's about TIME", _Canadian Geographic_ (September-October 1998)
994# </a> contains detailed boundaries for regions observing nonstandard
995# time and daylight saving time arrangements in Canada circa 1998.
996#
997# INMS, the Institute for National Measurement Standards in Ottawa, has <a
998# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
999# information about standard and daylight saving time zones in Canada.
1000# </a> (updated periodically).
1001# Its unofficial information is often taken from Matthews and Vincent.
1002
1003# From Paul Eggert (2006-06-27):
1004# For now, assume all of DST-observing Canada will fall into line with the
1005# new US DST rules,
1006
1007# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1008Rule Canada 1918 only - Apr 14 2:00 1:00 D
1009Rule Canada 1918 only - Oct 31 2:00 0 S
1010Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1011Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1012Rule Canada 1945 only - Sep 30 2:00 0 S
1013Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1014Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1015Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1016Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1017Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1018
1019
1020# Newfoundland and Labrador
1021
1022# From Paul Eggert (2000-10-02):
1023# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1024# but the only part of Labrador that follows the rules is the
1025# southeast corner, including Port Hope Simpson and Mary's Harbour,
1026# but excluding, say, Black Tickle.
1027
1028# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1029Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1030Rule StJohns 1917 only - Sep 17 2:00 0 S
1031# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1032Rule StJohns 1919 only - May 5 23:00 1:00 D
1033Rule StJohns 1919 only - Aug 12 23:00 0 S
1034# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1035Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1036Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1037# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1038# Pottenger.
1039Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1040Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1041# Whitman gives the following transitions:
1042# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1043# but go with Shanks & Pottenger and assume they used Canadian rules.
1044# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1045# Apr 30 - Sep 24; go with Shanks & Pottenger.
1046Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1047Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1048Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1049Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1050Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1051# From Paul Eggert (2000-10-02):
1052# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1053# at 00:01 local time. For now, assume it started in 1987.
1054Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1055Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1056Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1057Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1058Rule StJohns 2007 max - Mar Sun>=8 0:01 1:00 D
1059Rule StJohns 2007 max - Nov Sun>=1 0:01 0 S
1060#
1061# St John's has an apostrophe, but Posix file names can't have apostrophes.
1062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1063Zone America/St_Johns -3:30:52 - LMT 1884
1064 -3:30:52 StJohns N%sT 1918
1065 -3:30:52 Canada N%sT 1919
1066 -3:30:52 StJohns N%sT 1935 Mar 30
1067 -3:30 StJohns N%sT 1942 May 11
1068 -3:30 Canada N%sT 1946
1069 -3:30 StJohns N%sT
1070
1071# most of east Labrador
1072
1073# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1074# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1075Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1076 -3:30:52 - NST 1918
1077 -3:30:52 Canada N%sT 1919
1078 -3:30:52 - NST 1935 Mar 30
1079 -3:30 - NST 1936
1080 -3:30 StJohns N%sT 1942 May 11
1081 -3:30 Canada N%sT 1946
1082 -3:30 StJohns N%sT 1966 Mar 15 2:00
1083 -4:00 StJohns A%sT
1084
1085
1086# west Labrador, Nova Scotia, Prince Edward I
1087
1088# From Paul Eggert (2006-03-22):
1089# Shanks & Pottenger write that since 1970 most of this region has been like
1090# Halifax. Many locales did not observe peacetime DST until 1972;
1091# Glace Bay, NS is the largest that we know of.
1092# Shanks & Pottenger also write that Liverpool, NS was the only town
1093# in Canada to observe DST in 1971 but not 1970; for now we'll assume
1094# this is a typo.
1095
1096# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1097Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1098Rule Halifax 1916 only - Oct 1 0:00 0 S
1099Rule Halifax 1920 only - May 9 0:00 1:00 D
1100Rule Halifax 1920 only - Aug 29 0:00 0 S
1101Rule Halifax 1921 only - May 6 0:00 1:00 D
1102Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1103Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1104Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1105Rule Halifax 1923 only - Sep 4 0:00 0 S
1106Rule Halifax 1924 only - Sep 15 0:00 0 S
1107Rule Halifax 1925 only - Sep 28 0:00 0 S
1108Rule Halifax 1926 only - May 16 0:00 1:00 D
1109Rule Halifax 1926 only - Sep 13 0:00 0 S
1110Rule Halifax 1927 only - May 1 0:00 1:00 D
1111Rule Halifax 1927 only - Sep 26 0:00 0 S
1112Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1113Rule Halifax 1928 only - Sep 9 0:00 0 S
1114Rule Halifax 1929 only - Sep 3 0:00 0 S
1115Rule Halifax 1930 only - Sep 15 0:00 0 S
1116Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1117Rule Halifax 1932 only - May 1 0:00 1:00 D
1118Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1119Rule Halifax 1933 only - Oct 2 0:00 0 S
1120Rule Halifax 1934 only - May 20 0:00 1:00 D
1121Rule Halifax 1934 only - Sep 16 0:00 0 S
1122Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1123Rule Halifax 1935 only - Sep 30 0:00 0 S
1124Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1125Rule Halifax 1936 only - Sep 14 0:00 0 S
1126Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1127Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1128Rule Halifax 1939 only - May 28 0:00 1:00 D
1129Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1130Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1131Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1132Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1133Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1134Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1135Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1136Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1137Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1138# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1139Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1140 -4:00 Halifax A%sT 1918
1141 -4:00 Canada A%sT 1919
1142 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1143 -4:00 Canada A%sT 1946
1144 -4:00 Halifax A%sT 1974
1145 -4:00 Canada A%sT
1146Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1147 -4:00 Canada A%sT 1953
1148 -4:00 Halifax A%sT 1954
1149 -4:00 - AST 1972
1150 -4:00 Halifax A%sT 1974
1151 -4:00 Canada A%sT
1152
1153# New Brunswick
1154
1155# From Paul Eggert (2007-01-31):
1156# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1157# says they changed at 00:01 through 2006, and
1158# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1159# clear that this was the case since at least 1993.
1160# For now, assume it started in 1993.
1161
1162# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1163Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1164Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1165Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1166Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1167Rule Moncton 1939 only - May 27 1:00 1:00 D
1168Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1169Rule Moncton 1940 only - May 19 1:00 1:00 D
1170Rule Moncton 1941 only - May 4 1:00 1:00 D
1171Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1172Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1173Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1174Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1175Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1176# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1177Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1178 -5:00 - EST 1902 Jun 15
1179 -4:00 Canada A%sT 1933
1180 -4:00 Moncton A%sT 1942
1181 -4:00 Canada A%sT 1946
1182 -4:00 Moncton A%sT 1973
1183 -4:00 Canada A%sT 1993
1184 -4:00 Moncton A%sT 2007
1185 -4:00 Canada A%sT
1186
1187# Quebec
1188
1189# From Paul Eggert (2006-07-09):
1190# Shanks & Pottenger write that since 1970 most of Quebec has been
1191# like Montreal.
1192
1193# From Paul Eggert (2006-06-27):
1194# Matthews and Vincent (1998) also write that Quebec east of the -63
1195# meridian is supposed to observe AST, but residents as far east as
1196# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1197# In "Official time in Quebec" the Quebec department of justice writes in
1198# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1199# that "The residents of the Municipality of the
1200# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1201# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1202# written and use Atlantic standard time all year round. The same applies to
1203# the residents of the Native facilities along the lower North Shore."
1204# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1205# says this common practice was codified into law as of 2007.
1206# For lack of better info, guess this practice began around 1970, contra to
1207# Shanks & Pottenger who have this region observing AST/ADT.
1208
1209# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1210Rule Mont 1917 only - Mar 25 2:00 1:00 D
1211Rule Mont 1917 only - Apr 24 0:00 0 S
1212Rule Mont 1919 only - Mar 31 2:30 1:00 D
1213Rule Mont 1919 only - Oct 25 2:30 0 S
1214Rule Mont 1920 only - May 2 2:30 1:00 D
1215Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1216Rule Mont 1921 only - May 1 2:00 1:00 D
1217Rule Mont 1922 only - Apr 30 2:00 1:00 D
1218Rule Mont 1924 only - May 17 2:00 1:00 D
1219Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1220Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1221# The 1927-to-1937 rules can be expressed more simply as
1222# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1223# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1224# The rules below avoid use of 24:00
1225# (which pre-1998 versions of zic cannot handle).
1226Rule Mont 1927 only - May 1 0:00 1:00 D
1227Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1228Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1229Rule Mont 1932 only - May 1 0:00 1:00 D
1230Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1231Rule Mont 1933 only - Oct 1 0:00 0 S
1232Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1233Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1234Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1235Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1236Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1237Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1238
1239# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1240Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1241 -4:00 Canada A%sT 1970
1242 -4:00 - AST
1243Zone America/Montreal -4:54:16 - LMT 1884
1244 -5:00 Mont E%sT 1918
1245 -5:00 Canada E%sT 1919
1246 -5:00 Mont E%sT 1942 Feb 9 2:00s
1247 -5:00 Canada E%sT 1946
1248 -5:00 Mont E%sT 1974
1249 -5:00 Canada E%sT
1250
1251
1252# Ontario
1253
1254# From Paul Eggert (2006-07-09):
1255# Shanks & Pottenger write that since 1970 most of Ontario has been like
1256# Toronto.
1257# Thunder Bay skipped DST in 1973.
1258# Many smaller locales did not observe peacetime DST until 1974;
1259# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1260# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1261
1262# From Mark Brader (2003-07-26):
1263# [According to the Toronto Star] Orillia, Ontario, adopted DST
1264# effective Saturday, 1912-06-22, 22:00; the article mentions that
1265# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1266# have already done so. In Orillia DST was to run until Saturday,
1267# 1912-08-31 (no time mentioned), but it was met with considerable
1268# hostility from certain segments of the public, and was revoked after
1269# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1270# presumably that should be -07-06. (1912-06-19, -07-12; also letters
1271# earlier in June).
1272#
1273# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1274
1275# From Paul Eggert (1997-10-17):
1276# Mark Brader writes that an article in the 1997-10-14 Toronto Star
1277# says that Atikokan, Ontario currently does not observe DST,
1278# but will vote on 11-10 whether to use EST/EDT.
1279# He also writes that the
1280# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1281# Ontario Time Act (1990, Chapter T.9)
1282# </a>
1283# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1284# Officially Atikokan is therefore on CST/CDT, and most likely this report
1285# concerns a non-official time observed as a matter of local practice.
1286#
1287# From Paul Eggert (2000-10-02):
1288# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1289# New Osnaburgh observe CST all year, that Big Trout Lake observes
1290# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1291# violation of the official Ontario rules.
1292#
1293# From Paul Eggert (2006-07-09):
1294# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1295# 2005-07-21 Chronicle-Journal, which said:
1296#
1297# The clocks in Atikokan stay set on standard time year-round.
1298# This means they spend about half the time on central time and
1299# the other half on eastern time.
1300#
1301# For the most part, the system works, Mayor Dennis Brown said.
1302#
1303# "The majority of businesses in Atikokan deal more with Eastern
1304# Canada, but there are some that deal with Western Canada," he
1305# said. "I don't see any changes happening here."
1306#
1307# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1308# [New Osnaburgh] follow the same practice."
1309
1310# From Garry McKinnon (2006-07-14) via Chris Walton:
1311# I chatted with a member of my board who has an outstanding memory
1312# and a long history in Atikokan (and in the telecom industry) and he
1313# can say for certain that Atikokan has been practicing the current
1314# time keeping since 1952, at least.
1315
1316# From Paul Eggert (2006-07-17):
1317# Shanks & Pottenger say that Atikokan has agreed with Rainy River
1318# ever since standard time was introduced, but the information from
1319# McKinnon sounds more authoritative. For now, assume that Atikokan
1320# switched to EST immediately after WWII era daylight saving time
1321# ended. This matches the old (less-populous) America/Coral_Harbour
1322# entry since our cutoff date of 1970, so we can move
1323# America/Coral_Harbour to the 'backward' file.
1324
1325# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1326Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1327Rule Toronto 1919 only - Oct 26 0:00 0 S
1328Rule Toronto 1920 only - May 2 2:00 1:00 D
1329Rule Toronto 1920 only - Sep 26 0:00 0 S
1330Rule Toronto 1921 only - May 15 2:00 1:00 D
1331Rule Toronto 1921 only - Sep 15 2:00 0 S
1332Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1333# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1334# was meant.
1335Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1336Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1337# The 1927-to-1939 rules can be expressed more simply as
1338# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1339# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1340# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1341# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1342# The rules below avoid use of Sun>=25
1343# (which pre-2004 versions of zic cannot handle).
1344Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1345Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1346Rule Toronto 1932 only - May 1 2:00 1:00 D
1347Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1348Rule Toronto 1933 only - Oct 1 2:00 0 S
1349Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1350Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1351Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1352Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1353Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1354Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1355Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1356Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1357Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1358# Shanks & Pottenger say Toronto ended DST a week early in 1971,
1359# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1360# is wrong, and that he had confirmed it by checking the 1971-10-30
1361# Toronto Star, which said that DST was ending 1971-10-31 as usual.
1362Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1363
1364# From Paul Eggert (2003-07-27):
1365# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1366# Port Arthur, Ontario, the principle of the Bill has been in
1367# operation for the past three years, and in the City of Moose Jaw,
1368# Saskatchewan, for one year."
1369
1370# From David Bryan via Tory Tronrud, Director/Curator,
1371# Thunder Bay Museum (2003-11-12):
1372# There is some suggestion, however, that, by-law or not, daylight
1373# savings time was being practiced in Fort William and Port Arthur
1374# before 1909.... [I]n 1910, the line between the Eastern and Central
1375# Time Zones was permanently moved about two hundred miles west to
1376# include the Thunder Bay area.... When Canada adopted daylight
1377# savings time in 1916, Fort William and Port Arthur, having done so
1378# already, did not change their clocks.... During the Second World
1379# War,... [t]he cities agreed to implement DST during the summer
1380# months for the remainder of the war years.
1381
1382# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1383Zone America/Toronto -5:17:32 - LMT 1895
1384 -5:00 Canada E%sT 1919
1385 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1386 -5:00 Canada E%sT 1946
1387 -5:00 Toronto E%sT 1974
1388 -5:00 Canada E%sT
1389Zone America/Thunder_Bay -5:57:00 - LMT 1895
1390 -6:00 - CST 1910
1391 -5:00 - EST 1942
1392 -5:00 Canada E%sT 1970
1393 -5:00 Mont E%sT 1973
1394 -5:00 - EST 1974
1395 -5:00 Canada E%sT
1396Zone America/Nipigon -5:53:04 - LMT 1895
1397 -5:00 Canada E%sT 1940 Sep 29
1398 -5:00 1:00 EDT 1942 Feb 9 2:00s
1399 -5:00 Canada E%sT
1400Zone America/Rainy_River -6:18:16 - LMT 1895
1401 -6:00 Canada C%sT 1940 Sep 29
1402 -6:00 1:00 CDT 1942 Feb 9 2:00s
1403 -6:00 Canada C%sT
1404Zone America/Atikokan -6:06:28 - LMT 1895
1405 -6:00 Canada C%sT 1940 Sep 29
1406 -6:00 1:00 CDT 1942 Feb 9 2:00s
1407 -6:00 Canada C%sT 1945 Sep 30 2:00
1408 -5:00 - EST
1409
1410
1411# Manitoba
1412
1413# From Rob Douglas (2006-04-06):
1414# the old Manitoba Time Act - as amended by Bill 2, assented to
1415# March 27, 1987 ... said ...
1416# "between two o'clock Central Standard Time in the morning of
1417# the first Sunday of April of each year and two o'clock Central
1418# Standard Time in the morning of the last Sunday of October next
1419# following, one hour in advance of Central Standard Time."...
1420# I believe that the English legislation [of the old time act] had =
1421# been assented to (March 22, 1967)....
1422# Also, as far as I can tell, there was no order-in-council varying
1423# the time of Daylight Saving Time for 2005 and so the provisions of
1424# the 1987 version would apply - the changeover was at 2:00 Central
1425# Standard Time (i.e. not until 3:00 Central Daylight Time).
1426
1427# From Paul Eggert (2006-04-10):
1428# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1429# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1430# it was also 02:00s in 1966.
1431
1432# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1433Rule Winn 1916 only - Apr 23 0:00 1:00 D
1434Rule Winn 1916 only - Sep 17 0:00 0 S
1435Rule Winn 1918 only - Apr 14 2:00 1:00 D
1436Rule Winn 1918 only - Oct 31 2:00 0 S
1437Rule Winn 1937 only - May 16 2:00 1:00 D
1438Rule Winn 1937 only - Sep 26 2:00 0 S
1439Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1440Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1441Rule Winn 1945 only - Sep lastSun 2:00 0 S
1442Rule Winn 1946 only - May 12 2:00 1:00 D
1443Rule Winn 1946 only - Oct 13 2:00 0 S
1444Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1445Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1446Rule Winn 1950 only - May 1 2:00 1:00 D
1447Rule Winn 1950 only - Sep 30 2:00 0 S
1448Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1449Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1450Rule Winn 1959 only - Oct lastSun 2:00 0 S
1451Rule Winn 1960 only - Sep lastSun 2:00 0 S
1452Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1453Rule Winn 1963 only - Sep 22 2:00 0 S
1454Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1455Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1456Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1457# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1458Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1459 -6:00 Winn C%sT 2006
1460 -6:00 Canada C%sT
1461
1462
1463# Saskatchewan
1464
1465# From Mark Brader (2003-07-26):
1466# The first actual adoption of DST in Canada was at the municipal
1467# level. As the [Toronto] Star put it (1912-06-07), "While people
1468# elsewhere have long been talking of legislation to save daylight,
1469# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1470# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1471# presumably late evening, as below), and would run until "the end of
1472# the summer". The discrepancy between municipal time and railroad
1473# time was noted.
1474
1475# From Paul Eggert (2003-07-27):
1476# Willett (1914-03) notes that DST "has been in operation ... in the
1477# City of Moose Jaw, Saskatchewan, for one year."
1478
1479# From Paul Eggert (2006-03-22):
1480# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1481# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1482# Other western towns (e.g. Lloydminster) are like Edmonton.
1483# Matthews and Vincent (1998) write that Denare Beach and Creighton
1484# are like Winnipeg, in violation of Saskatchewan law.
1485
1486# From W. Jones (1992-11-06):
1487# The. . .below is based on information I got from our law library, the
1488# provincial archives, and the provincial Community Services department.
1489# A precise history would require digging through newspaper archives, and
1490# since you didn't say what you wanted, I didn't bother.
1491#
1492# Saskatchewan is split by a time zone meridian (105W) and over the years
1493# the boundary became pretty ragged as communities near it reevaluated
1494# their affiliations in one direction or the other. In 1965 a provincial
1495# referendum favoured legislating common time practices.
1496#
1497# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1498# Saskatchewan 1978) was proclaimed, and established that the eastern
1499# part of Saskatchewan would use CST year round, that districts in
1500# northwest Saskatchewan would by default follow CST but could opt to
1501# follow Mountain Time rules (thus 1 hour difference in the winter and
1502# zero in the summer), and that districts in southwest Saskatchewan would
1503# by default follow MT but could opt to follow CST.
1504#
1505# It took a few years for the dust to settle (I know one story of a town
1506# on one time zone having its school in another, such that a mom had to
1507# serve her family lunch in two shifts), but presently it seems that only
1508# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1509# rules any more; all other districts appear to have used CST year round
1510# since sometime in the 1960s.
1511
1512# From Chris Walton (2006-06-26):
1513# The Saskatchewan time act which was last updated in 1996 is about 30 pages
1514# long and rather painful to read.
1515# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1516
1517# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1518Rule Regina 1918 only - Apr 14 2:00 1:00 D
1519Rule Regina 1918 only - Oct 31 2:00 0 S
1520Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1521Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1522Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1523Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1524Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1525Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1526Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1527Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1528Rule Regina 1945 only - Sep lastSun 2:00 0 S
1529Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1530Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1531Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1532Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1533Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1534Rule Regina 1959 only - Oct lastSun 2:00 0 S
1535#
1536Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1537Rule Swift 1957 only - Oct lastSun 2:00 0 S
1538Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1539Rule Swift 1959 only - Oct lastSun 2:00 0 S
1540Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1541# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1542Zone America/Regina -6:58:36 - LMT 1905 Sep
1543 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1544 -6:00 - CST
1545Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1546 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1547 -7:00 Regina M%sT 1950
1548 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1549 -6:00 - CST
1550
1551
1552# Alberta
1553
1554# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1555Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1556Rule Edm 1918 only - Oct 31 2:00 0 S
1557Rule Edm 1919 only - May 27 2:00 0 S
1558Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1559Rule Edm 1920 only - Oct lastSun 2:00 0 S
1560Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1561Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1562Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1563Rule Edm 1945 only - Sep lastSun 2:00 0 S
1564Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1565Rule Edm 1947 only - Sep lastSun 2:00 0 S
1566Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1567Rule Edm 1967 only - Oct lastSun 2:00 0 S
1568Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1569Rule Edm 1969 only - Oct lastSun 2:00 0 S
1570Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1571Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1572# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1573Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1574 -7:00 Edm M%sT 1987
1575 -7:00 Canada M%sT
1576
1577
1578# British Columbia
1579
1580# From Paul Eggert (2006-03-22):
1581# Shanks & Pottenger write that since 1970 most of this region has
1582# been like Vancouver.
1583# Dawson Creek uses MST. Much of east BC is like Edmonton.
1584# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1585
1586# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1587Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1588Rule Vanc 1918 only - Oct 31 2:00 0 S
1589Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1590Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1591Rule Vanc 1945 only - Sep 30 2:00 0 S
1592Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1593Rule Vanc 1946 only - Oct 13 2:00 0 S
1594Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1595Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1596# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1597Zone America/Vancouver -8:12:28 - LMT 1884
1598 -8:00 Vanc P%sT 1987
1599 -8:00 Canada P%sT
1600Zone America/Dawson_Creek -8:00:56 - LMT 1884
1601 -8:00 Canada P%sT 1947
1602 -8:00 Vanc P%sT 1972 Aug 30 2:00
1603 -7:00 - MST
1604
1605
1606# Northwest Territories, Nunavut, Yukon
1607
1608# From Paul Eggert (2006-03-22):
1609# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1610# Mathew Englander (1996-10-07) gives the following refs:
1611# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1612# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1613# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1614# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1615# * O.I.C. 1980/02 established DST.
1616# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1617# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1618# with Englander.
1619# From Chris Walton (2006-06-26):
1620# Here is a link to the old daylight saving portion of the interpretation
1621# act which was last updated in 1987:
1622# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1623
1624# From Rives McDow (1999-09-04):
1625# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1626# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1627# Nunavut moves to single time zone Oct. 31
1628# </a>
1629#
1630# From Antoine Leca (1999-09-06):
1631# We then need to create a new timezone for the Kitikmeot region of Nunavut
1632# to differentiate it from the Yellowknife region.
1633
1634# From Paul Eggert (1999-09-20):
1635# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1636# Basic Facts: The New Territory
1637# </a> (1999) reports that Pangnirtung operates on eastern time,
1638# and that Coral Harbour does not observe DST. We don't know when
1639# Pangnirtung switched to eastern time; we'll guess 1995.
1640
1641# From Rives McDow (1999-11-08):
1642# On October 31, when the rest of Nunavut went to Central time,
1643# Pangnirtung wobbled. Here is the result of their wobble:
1644#
1645# The following businesses and organizations in Pangnirtung use Central Time:
1646#
1647# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1648# Eastern Arctic National Parks, A & D Specialist
1649#
1650# The following businesses and organizations in Pangnirtung use Eastern Time:
1651#
1652# Hamlet office, All other businesses, Both schools, Airport operator
1653#
1654# This has made for an interesting situation there, which warranted the news.
1655# No one there that I spoke with seems concerned, or has plans to
1656# change the local methods of keeping time, as it evidently does not
1657# really interfere with any activities or make things difficult locally.
1658# They plan to celebrate New Year's turn-over twice, one hour apart,
1659# so it appears that the situation will last at least that long.
1660# The Nunavut Intergovernmental Affairs hopes that they will "come to
1661# their senses", but the locals evidently don't see any problem with
1662# the current state of affairs.
1663
1664# From Michaela Rodrigue, writing in the
1665# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1666# Nunatsiaq News (1999-11-19)</a>:
1667# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1668# central - or Nunavut time - for government offices, and eastern time
1669# for municipal offices and schools.... Igloolik [was similar but then]
1670# made the switch to central time on Saturday, Nov. 6.
1671
1672# From Paul Eggert (2000-10-02):
1673# Matthews and Vincent (1998) say the following, but we lack histories
1674# for these potential new Zones.
1675#
1676# The Canadian Forces station at Alert uses Eastern Time while the
1677# handful of residents at the Eureka weather station [in the Central
1678# zone] skip daylight savings. Baffin Island, which is crossed by the
1679# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1680# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1681# Central Time and Southampton Island [in the Central zone] is not
1682# required to use daylight savings.
1683
1684# From
1685# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1686# Nunavut now has two time zones
1687# </a> (2000-11-10):
1688# The Nunavut government would allow its employees in Kugluktuk and
1689# Cambridge Bay to operate on central time year-round, putting them
1690# one hour behind the rest of Nunavut for six months during the winter.
1691# At the end of October the two communities had rebelled against
1692# Nunavut's unified time zone, refusing to shift to eastern time with
1693# the rest of the territory for the winter. Cambridge Bay remained on
1694# central time, while Kugluktuk, even farther west, reverted to
1695# mountain time, which they had used before the advent of Nunavut's
1696# unified time zone in 1999.
1697#
1698# From Rives McDow (2001-01-20), quoting the Nunavut government:
1699# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1700
1701# From Paul Eggert (2000-12-04):
1702# Let's just keep track of the official times for now.
1703
1704# From Rives McDow (2001-03-07):
1705# The premier of Nunavut has issued a ministerial statement advising
1706# that effective 2001-04-01, the territory of Nunavut will revert
1707# back to three time zones (mountain, central, and eastern). Of the
1708# cities in Nunavut, Coral Harbor is the only one that I know of that
1709# has said it will not observe dst, staying on EST year round. I'm
1710# checking for more info, and will get back to you if I come up with
1711# more.
1712# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1713
1714# From Gwillim Law (2005-05-21):
1715# According to maps at
1716# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
1717# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
1718# (both dated 2003), and
1719# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
1720# (from a 1998 Canadian Geographic article), the de facto and de jure time
1721# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
1722# round. Using Google, it's easy to find other websites that confirm this.
1723# I wasn't able to find how far back this time regimen goes, but since it
1724# predates the creation of Nunavut, it probably goes back many years....
1725# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
1726#
1727# From Paul Eggert (2005-07-26):
1728# For lack of better information, assume that Southampton Island observed
1729# daylight saving only during wartime.
1730
1731# From Chris Walton (2007-03-01):
1732# ... the community of Resolute (located on Cornwallis Island in
1733# Nunavut) moved from Central Time to Eastern Time last November.
1734# Basically the community did not change its clocks at the end of
1735# daylight saving....
1736# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
1737
1738# From Chris Walton (2007-03-14):
1739# Today I phoned the "hamlet office" to find out what Resolute was doing with
1740# its clocks.
1741#
1742# The individual that answered the phone confirmed that the clocks did not
1743# move at the end of daylight saving on October 29/2006. He also told me that
1744# the clocks did not move this past weekend (March 11/2007)....
1745#
1746# America/Resolute should use the "Canada" Rule up to October 29/2006.
1747# After that it should be fixed on Eastern Standard Time until further notice.
1748
1749# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1750Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1751Rule NT_YK 1918 only - Oct 27 2:00 0 S
1752Rule NT_YK 1919 only - May 25 2:00 1:00 D
1753Rule NT_YK 1919 only - Nov 1 0:00 0 S
1754Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1755Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1756Rule NT_YK 1945 only - Sep 30 2:00 0 S
1757Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1758Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1759Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1760Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
1761Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
1762# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1763# aka Panniqtuuq
1764Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
1765 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1766 -5:00 Canada E%sT 1999 Oct 31 2:00
1767 -6:00 Canada C%sT 2000 Oct 29 2:00
1768 -5:00 Canada E%sT
1769# formerly Frobisher Bay
1770Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
1771 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1772 -6:00 Canada C%sT 2000 Oct 29 2:00
1773 -5:00 Canada E%sT
1774# aka Qausuittuq
1775Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
1776 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1777 -5:00 - EST 2001 Apr 1 3:00
1778 -6:00 Canada C%sT 2006 Oct 29 2:00
1779 -5:00 - EST
1780# aka Kangiqiniq
1781Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
1782 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1783 -5:00 - EST 2001 Apr 1 3:00
1784 -6:00 Canada C%sT
1785# aka Iqaluktuuttiaq
1786Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
1787 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1788 -6:00 Canada C%sT 2000 Oct 29 2:00
1789 -5:00 - EST 2000 Nov 5 0:00
1790 -6:00 - CST 2001 Apr 1 3:00
1791 -7:00 Canada M%sT
1792Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
1793 -7:00 NT_YK M%sT 1980
1794 -7:00 Canada M%sT
1795Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
1796 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1797 -7:00 NT_YK M%sT 1980
1798 -7:00 Canada M%sT
1799Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1800 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1801 -8:00 NT_YK P%sT 1980
1802 -8:00 Canada P%sT
1803Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1804 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1805 -8:00 NT_YK P%sT 1980
1806 -8:00 Canada P%sT
1807
1808
1809###############################################################################
1810
1811# Mexico
1812
1813# From Paul Eggert (2001-03-05):
1814# The Investigation and Analysis Service of the
1815# Mexican Library of Congress (MLoC) has published a
1816# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1817# history of Mexican local time (in Spanish)
1818# </a>.
1819#
1820# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
1821# (In all cases we go with the MLoC.)
1822# S&P report that Baja was at -8:00 in 1922/1923.
1823# S&P say the 1930 transition in Baja was 1930-11-16.
1824# S&P report no DST during summer 1931.
1825# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
1826
1827# From Gwillim Law (2001-02-20):
1828# There are some other discrepancies between the Decrees page and the
1829# tz database. I think they can best be explained by supposing that
1830# the researchers who prepared the Decrees page failed to find some of
1831# the relevant documents.
1832
1833# From Alan Perry (1996-02-15):
1834# A guy from our Mexico subsidiary finally found the Presidential Decree
1835# outlining the timezone changes in Mexico.
1836#
1837# ------------- Begin Forwarded Message -------------
1838#
1839# I finally got my hands on the Official Presidential Decree that sets up the
1840# rules for the DST changes. The rules are:
1841#
1842# 1. The country is divided in 3 timezones:
1843# - Baja California Norte (the Mexico/BajaNorte TZ)
1844# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1845# - The rest of the country (the Mexico/General TZ)
1846#
1847# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1848# at 2:00 AM, the times in each zone are as follows:
1849# BajaNorte: GMT+7
1850# BajaSur: GMT+6
1851# General: GMT+5
1852#
1853# 3. The rest of the year, the times are as follows:
1854# BajaNorte: GMT+8
1855# BajaSur: GMT+7
1856# General: GMT+6
1857#
1858# The Decree was published in Mexico's Official Newspaper on January 4th.
1859#
1860# -------------- End Forwarded Message --------------
1861# From Paul Eggert (1996-06-12):
1862# For an English translation of the decree, see
1863# <a href="http://mexico-travel.com/extra/timezone_eng.html">
1864# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1865# </a>
1866
1867# From Rives McDow (1998-10-08):
1868# The State of Quintana Roo has reverted back to central STD and DST times
1869# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1870
1871# From Rives McDow (2000-01-10):
1872# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1873# zone 5 hours from the International Date Line, and will not observe daylight
1874# savings time so as to stay on the same time zone as the southern part of
1875# Arizona year round.
1876
1877# From Jesper Norgaard, translating
1878# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1879# In Oaxaca, the 55.000 teachers from the Section 22 of the National
1880# Syndicate of Education Workers, refuse to apply daylight saving each
1881# year, so that the more than 10,000 schools work at normal hour the
1882# whole year.
1883
1884# From Gwillim Law (2001-01-19):
1885# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1886# (translated):...
1887# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1888# that Summer Time will be reduced from seven to five months, starting
1889# this year....
1890# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1891# [translated], says "summer time will ... take effect on the first Sunday
1892# in May, and end on the last Sunday of September.
1893
1894# From Arthur David Olson (2001-01-25):
1895# The 2001-01-24 traditional Washington Post contained the page one
1896# story "Timely Issue Divides Mexicans."...
1897# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1898# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1899# Mexico City and its 20 million residents on a different time than
1900# the rest of the country..." In particular, Lopez Obrador would abolish
1901# observation of Daylight Saving Time.
1902
1903# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1904# Official statute published by the Energy Department
1905# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1906# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1907
1908# From Paul Eggert (2001-03-03):
1909#
1910# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1911# James F. Smith writes in today's LA Times
1912# </a>
1913# * Sonora will continue to observe standard time.
1914# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1915# the Federal District will not adopt DST.
1916# * 4 of 16 district leaders announced they'll ignore the decree.
1917# * The decree does not affect federal-controlled facilities including
1918# the airport, banks, hospitals, and schools.
1919#
1920# For now we'll assume that the Federal District will bow to federal rules.
1921
1922# From Jesper Norgaard (2001-04-01):
1923# I found some references to the Mexican application of daylight
1924# saving, which modifies what I had already sent you, stating earlier
1925# that a number of northern Mexican states would go on daylight
1926# saving. The modification reverts this to only cover Baja California
1927# (Norte), while all other states (except Sonora, who has no daylight
1928# saving all year) will follow the original decree of president
1929# Vicente Fox, starting daylight saving May 6, 2001 and ending
1930# September 30, 2001.
1931# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1932# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1933
1934# From Reuters (2001-09-04):
1935# Mexico's Supreme Court on Tuesday declared that daylight savings was
1936# unconstitutional in Mexico City, creating the possibility the
1937# capital will be in a different time zone from the rest of the nation
1938# next year.... The Supreme Court's ruling takes effect at 2:00
1939# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1940# standard time. "This is so residents of the Federal District are not
1941# subject to unexpected time changes," a statement from the court said.
1942
1943# From Jesper Norgaard Welen (2002-03-12):
1944# ... consulting my local grocery store(!) and my coworkers, they all insisted
1945# that a new decision had been made to reinstate US style DST in Mexico....
1946# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1947# confirms this. Sonora as usual is the only state where DST is not applied.
1948
1949# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1950Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1951Rule Mexico 1939 only - Jun 25 0:00 0 S
1952Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1953Rule Mexico 1941 only - Apr 1 0:00 0 S
1954Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
1955Rule Mexico 1944 only - May 1 0:00 0 S
1956Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1957Rule Mexico 1950 only - Jul 30 0:00 0 S
1958Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1959Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1960Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1961Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1962Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1963Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1964# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1965# Quintana Roo
1966Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1967 -6:00 - CST 1981 Dec 23
1968 -5:00 Mexico E%sT 1998 Aug 2 2:00
1969 -6:00 Mexico C%sT
1970# Campeche, Yucatan
1971Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1972 -6:00 - CST 1981 Dec 23
1973 -5:00 - EST 1982 Dec 2
1974 -6:00 Mexico C%sT
1975# Coahuila, Durango, Nuevo Leon, Tamaulipas
1976Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1977 -6:00 - CST 1988
1978 -6:00 US C%sT 1989
1979 -6:00 Mexico C%sT
1980# Central Mexico
1981Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1982 -7:00 - MST 1927 Jun 10 23:00
1983 -6:00 - CST 1930 Nov 15
1984 -7:00 - MST 1931 May 1 23:00
1985 -6:00 - CST 1931 Oct
1986 -7:00 - MST 1932 Apr 1
1987 -6:00 Mexico C%sT 2001 Sep 30 02:00
1988 -6:00 - CST 2002 Feb 20
1989 -6:00 Mexico C%sT
1990# Chihuahua
1991Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1992 -7:00 - MST 1927 Jun 10 23:00
1993 -6:00 - CST 1930 Nov 15
1994 -7:00 - MST 1931 May 1 23:00
1995 -6:00 - CST 1931 Oct
1996 -7:00 - MST 1932 Apr 1
1997 -6:00 - CST 1996
1998 -6:00 Mexico C%sT 1998
1999 -6:00 - CST 1998 Apr Sun>=1 3:00
2000 -7:00 Mexico M%sT
2001# Sonora
2002Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2003 -7:00 - MST 1927 Jun 10 23:00
2004 -6:00 - CST 1930 Nov 15
2005 -7:00 - MST 1931 May 1 23:00
2006 -6:00 - CST 1931 Oct
2007 -7:00 - MST 1932 Apr 1
2008 -6:00 - CST 1942 Apr 24
2009 -7:00 - MST 1949 Jan 14
2010 -8:00 - PST 1970
2011 -7:00 Mexico M%sT 1999
2012 -7:00 - MST
2013# Baja California Sur, Nayarit, Sinaloa
2014Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2015 -7:00 - MST 1927 Jun 10 23:00
2016 -6:00 - CST 1930 Nov 15
2017 -7:00 - MST 1931 May 1 23:00
2018 -6:00 - CST 1931 Oct
2019 -7:00 - MST 1932 Apr 1
2020 -6:00 - CST 1942 Apr 24
2021 -7:00 - MST 1949 Jan 14
2022 -8:00 - PST 1970
2023 -7:00 Mexico M%sT
2024# Baja California
2025Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2026 -7:00 - MST 1924
2027 -8:00 - PST 1927 Jun 10 23:00
2028 -7:00 - MST 1930 Nov 15
2029 -8:00 - PST 1931 Apr 1
2030 -8:00 1:00 PDT 1931 Sep 30
2031 -8:00 - PST 1942 Apr 24
2032 -8:00 1:00 PWT 1945 Aug 14 23:00u
2033 -8:00 1:00 PPT 1945 Nov 12 # Peace
2034 -8:00 - PST 1948 Apr 5
2035 -8:00 1:00 PDT 1949 Jan 14
2036 -8:00 - PST 1954
2037 -8:00 CA P%sT 1961
2038 -8:00 - PST 1976
2039 -8:00 US P%sT 1996
2040 -8:00 Mexico P%sT 2001
2041 -8:00 US P%sT 2002 Feb 20
2042 -8:00 Mexico P%sT
2043# From Paul Eggert (2006-03-22):
2044# Formerly there was an America/Ensenada zone, which differed from
2045# America/Tijuana only in that it did not observe DST from 1976
2046# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2047# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2048# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2049# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2050# DST-observance was a town-by-town matter back then. This concerns
2051# data after 1970 so most likely there should be at least one Zone
2052# other than America/Tijuana for Baja, but it's not clear yet what its
2053# name or contents should be.
2054#
2055# Revillagigedo Is
2056# no information
2057
2058###############################################################################
2059
2060# Anguilla
2061# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2062Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2063 -4:00 - AST
2064
2065# Antigua and Barbuda
2066# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2067Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2068 -5:00 - EST 1951
2069 -4:00 - AST
2070
2071# Bahamas
2072#
2073# From Sue Williams (2006-12-07):
2074# The Bahamas announced about a month ago that they plan to change their DST
2075# rules to sync with the U.S. starting in 2007....
2076# http://www.jonesbahamas.com/?c=45&a=10412
2077
2078# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2079Rule Bahamas 1964 2006 - Oct lastSun 2:00 0 S
2080Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
2079Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2080Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2081# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2082Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
2083 -5:00 Bahamas E%sT 1976
2084 -5:00 US E%sT
2085
2086# Barbados
2087# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2088Rule Barb 1977 only - Jun 12 2:00 1:00 D
2089Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2090Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2091Rule Barb 1979 only - Sep 30 2:00 0 S
2092Rule Barb 1980 only - Sep 25 2:00 0 S
2093# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2094Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
2095 -3:58:28 - BMT 1932 # Bridgetown Mean Time
2096 -4:00 Barb A%sT
2097
2098# Belize
2099# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2100# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2101Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2102Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2103Rule Belize 1973 only - Dec 5 0:00 1:00 D
2104Rule Belize 1974 only - Feb 9 0:00 0 S
2105Rule Belize 1982 only - Dec 18 0:00 1:00 D
2106Rule Belize 1983 only - Feb 12 0:00 0 S
2107# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2108Zone America/Belize -5:52:48 - LMT 1912 Apr
2109 -6:00 Belize C%sT
2110
2111# Bermuda
2112
2113# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2114
2115# Next year, however, clocks in the US will go forward on the second Sunday
2116# in March, until the first Sunday in November. And, after the Time Zone
2117# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2118# Friday, the same thing will happen in Bermuda.
2119# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2120
2121# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2122Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
2123 -4:00 - AST 1974 Apr 28 2:00
2124 -4:00 Bahamas A%sT 1976
2125 -4:00 US A%sT
2126
2127# Cayman Is
2128# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2129Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2130 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2131 -5:00 - EST
2132
2133# Costa Rica
2134# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2135Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2136Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2137Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2138# IATA SSIM (1991-09) says the following was at 1:00;
2139# go with Shanks & Pottenger.
2140Rule CR 1991 only - Jul 1 0:00 0 S
2141Rule CR 1992 only - Mar 15 0:00 0 S
2142# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2143# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2144Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
2145 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
2146 -6:00 CR C%sT
2147# Coco
2148# no information; probably like America/Costa_Rica
2149
2150# Cuba
2151
2152# From Arthur David Olson (1999-03-29):
2153# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2154# the Cuban National Team and the Baltimore Orioles was carried live on
2155# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2156# During the game, play-by-play announcer Jim Hunter noted that
2157# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2158# Time today." (The "two hour" remark referred to losing one hour of
2159# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2160# to DST--and one more hour on 1999-04-04--when the announcers will have
2161# returned to Baltimore, which switches on that date.)
2162
2163# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2164# Cuba is not going back to standard time this year.
2165# From Paul Eggert (2006-03-22):
2166# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2167# says that it's due to a problem at the Antonio Guiteras
2168# thermoelectric plant, and says "This October there will be no return
2169# to normal hours (after daylight saving time)".
2170# For now, let's assume that it's a temporary measure.
2171
2172# From Carlos A. Carnero Delgado (2005-11-12):
2173# This year (just like in 2004-2005) there's no change in time zone
2174# adjustment in Cuba. We will stay in daylight saving time:
2175# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2176
2177# From Jesper Norgaard Welen (2006-10-21):
2178# An article in GRANMA INTERNACIONAL claims that Cuba will end
2179# the 3 years of permanent DST next weekend, see
2180# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2181# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2182# watches should be set back one hour -- going back to 00:00 hours -- returning
2183# to the normal schedule....
2184
2185# From Paul Eggert (2007-03-02):
2186# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2187# says Cuban clocks will advance at midnight on March 10.
2188# For lack of better information, assume Cuba will use US rules,
2189# except that it switches at midnight standard time as usual.
2190#
2191# From Steffen Thorsen (2007-10-25):
2192# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2193# earlier - on the last Sunday of October, just like in 2006.
2194#
2195# He supplied these references:
2196#
2197# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2198# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2199#
2200# From Alex Kryvenishev (2007-10-25):
2201# Here is also article from Granma (Cuba):
2202#
2203# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2204# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2205#
2206# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2207
2208# From Arthur David Olson (2008-03-09):
2209# I'm in Maryland which is now observing United States Eastern Daylight
2210# Time. At 9:44 local time I used RealPlayer to listen to
2211# <a href="http://media.enet.cu/radioreloj">
2212# http://media.enet.cu/radioreloj
2213# </a>, a Cuban information station, and heard
2214# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2215# indicating that Cuba is still on standard time.
2216
2217# From Steffen Thorsen (2008-03-12):
2218# It seems that Cuba will start DST on Sunday, 2007-03-16...
2219# It was announced yesterday, according to this source (in Spanish):
2220# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2221# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2222# </a>
2223#
2224# Some more background information is posted here:
2225# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2226# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2227# </a>
2228#
2229# The article also says that Cuba has been observing DST since 1963,
2230# while Shanks (and tzdata) has 1965 as the first date (except in the
2231# 1940's). Many other web pages in Cuba also claim that it has been
2232# observed since 1963, but with the exception of 1970 - an exception
2233# which is not present in tzdata/Shanks. So there is a chance we need to
2234# change some historic records as well.
2235#
2236# One example:
2237# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2238# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2239# </a>
2240
2241# From Jesper Norgaard Welen (2008-03-13):
2242# The Cuban time change has just been confirmed on the most authoritative
2243# web site, the Granma. Please check out
2244# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2245# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2246# </a>
2247#
2248# Basically as expected after Steffen Thorsens information, the change
2249# will take place midnight between Saturday and Sunday.
2250
2251# From Arthur David Olson (2008-03-12):
2252# Assume Sun>=15 (third Sunday) going forward.
2253
2254# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2255Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2256Rule Cuba 1928 only - Oct 10 0:00 0 S
2257Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2258Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2259Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2260Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2261Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2262Rule Cuba 1965 only - Sep 30 0:00 0 S
2263Rule Cuba 1966 only - May 29 0:00 1:00 D
2264Rule Cuba 1966 only - Oct 2 0:00 0 S
2265Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2266Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2267Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2268Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2269Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2270Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2271Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2272Rule Cuba 1978 only - May 7 0:00 1:00 D
2273Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2274Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2275Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2276Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2277Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2278Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2279Rule Cuba 1996 only - Oct 6 0:00s 0 S
2280Rule Cuba 1997 only - Oct 12 0:00s 0 S
2281Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2282Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2283Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D
2284Rule Cuba 2006 max - Oct lastSun 0:00s 0 S
2285Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2286Rule Cuba 2008 max - Mar Sun>=15 0:00s 1:00 D
2287
2288# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2289Zone America/Havana -5:29:28 - LMT 1890
2290 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2291 -5:00 Cuba C%sT
2292
2293# Dominica
2294# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2295Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2296 -4:00 - AST
2297
2298# Dominican Republic
2299
2300# From Steffen Thorsen (2000-10-30):
2301# Enrique Morales reported to me that the Dominican Republic has changed the
2302# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2303# http://www.listin.com.do/antes/261000/republica/princi.html
2304
2305# From Paul Eggert (2000-12-04):
2306# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2307
2308# From Rives McDow (2000-12-01):
2309# Dominican Republic changed its mind and presidential decree on Tuesday,
2310# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2311# Dominican Republic will be reverting to 8 hours from the International Date
2312# Line, and will not be using DST in the foreseeable future. The reason they
2313# decided to use DST was to be in synch with Puerto Rico, who was also going
2314# to implement DST. When Puerto Rico didn't implement DST, the president
2315# decided to revert.
2316
2317
2318# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2319Rule DR 1966 only - Oct 30 0:00 1:00 D
2320Rule DR 1967 only - Feb 28 0:00 0 S
2321Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2322Rule DR 1970 only - Feb 21 0:00 0 S
2323Rule DR 1971 only - Jan 20 0:00 0 S
2324Rule DR 1972 1974 - Jan 21 0:00 0 S
2325# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2326Zone America/Santo_Domingo -4:39:36 - LMT 1890
2327 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2328 -5:00 DR E%sT 1974 Oct 27
2329 -4:00 - AST 2000 Oct 29 02:00
2330 -5:00 US E%sT 2000 Dec 3 01:00
2331 -4:00 - AST
2332
2333# El Salvador
2334
2335# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2336Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2337Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2338# There are too many San Salvadors elsewhere, so use America/El_Salvador
2339# instead of America/San_Salvador.
2340# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2341Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2342 -6:00 Salv C%sT
2343
2344# Grenada
2345# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2346Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2347 -4:00 - AST
2348
2349# Guadeloupe
2350# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2351Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2352 -4:00 - AST
2353# St Barthelemy
2354Link America/Guadeloupe America/St_Barthelemy
2355# St Martin (French part)
2356Link America/Guadeloupe America/Marigot
2357
2358# Guatemala
2359#
2360# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2361# Diario Co Latino, at
2362# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2363# says in an article dated 2006-04-19 that the Guatemalan government had
2364# decided on that date to advance official time by 60 minutes, to lessen the
2365# impact of the elevated cost of oil.... Daylight saving time will last from
2366# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2367# From Paul Eggert (2006-06-22):
2368# The Ministry of Energy and Mines, press release CP-15/2006
2369# (2006-04-19), says DST ends at 24:00. See
2370# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2371
2372# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2373Rule Guat 1973 only - Nov 25 0:00 1:00 D
2374Rule Guat 1974 only - Feb 24 0:00 0 S
2375Rule Guat 1983 only - May 21 0:00 1:00 D
2376Rule Guat 1983 only - Sep 22 0:00 0 S
2377Rule Guat 1991 only - Mar 23 0:00 1:00 D
2378Rule Guat 1991 only - Sep 7 0:00 0 S
2379Rule Guat 2006 only - Apr 30 0:00 1:00 D
2380Rule Guat 2006 only - Oct 1 0:00 0 S
2381# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2382Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2383 -6:00 Guat C%sT
2384
2385# Haiti
2386# From Gwillim Law (2005-04-15):
2387# Risto O. Nykanen wrote me that Haiti is now on DST.
2388# I searched for confirmation, and I found a
2389# <a href="http://www.haitianconsulate.org/time.doc"> press release
2390# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2391# </a>. Translated from French, it says:
2392#
2393# "The Prime Minister's Communication Office notifies the public in general
2394# and the press in particular that, following a decision of the Interior
2395# Ministry and the Territorial Collectivities [I suppose that means the
2396# provinces], Haiti will move to Eastern Daylight Time in the night from next
2397# Saturday the 2nd to Sunday the 3rd.
2398#
2399# "Consequently, the Prime Minister's Communication Office wishes to inform
2400# the population that the country's clocks will be set forward one hour
2401# starting at midnight. This provision will hold until the last Saturday in
2402# October 2005.
2403#
2404# "Port-au-Prince, March 31, 2005"
2405#
2406# From Steffen Thorsen (2006-04-04):
2407# I have been informed by users that Haiti observes DST this year like
2408# last year, so the current "only" rule for 2005 might be changed to a
2409# "max" rule or to last until 2006. (Who knows if they will observe DST
2410# next year or if they will extend their DST like US/Canada next year).
2411#
2412# I have found this article about it (in French):
2413# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2414#
2415# The reason seems to be an energy crisis.
2416
2417# From Stephen Colebourne (2007-02-22):
2418# Some IATA info: Haiti won't be having DST in 2007.
2419
2420
2421# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2422Rule Haiti 1983 only - May 8 0:00 1:00 D
2423Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
2424Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
2425# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
2426# Go with IATA.
2427Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
2428Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
2429Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
2430Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
2431# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2432Zone America/Port-au-Prince -4:49:20 - LMT 1890
2433 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
2434 -5:00 Haiti E%sT
2435
2436# Honduras
2437# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
2438
2439# From Paul Eggert (2006-05-05):
2440# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
2441# saying Honduras will start using DST midnight Saturday, effective 4
2442# months until September. La Tribuna reported today
2443# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
2444# of Honduras, refused to back down on this.
2445
2446# From Jesper Norgaard Welen (2006-08-08):
2447# It seems that Honduras has returned from DST to standard time this Monday at
2448# 00:00 hours (prolonging Sunday to 25 hours duration).
2449# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
2450
2451# From Paul Eggert (2006-08-08):
2452# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
2453# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
2454# It mentions executive decree 18-2006.
2455
2456# From Steffen Thorsen (2006-08-17):
2457# Honduras will observe DST from 2007 to 2009, exact dates are not
2458# published, I have located this authoritative source:
2459# http://www.presidencia.gob.hn/noticia.aspx?nId=47
2460
2461# From Steffen Thorsen (2007-03-30):
2462# http://www.laprensahn.com/pais_nota.php?id04962=7386
2463# So it seems that Honduras will not enter DST this year....
2464
2465# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2466Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
2467Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
2468Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
2469Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
2470# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2471Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
2472 -6:00 Hond C%sT
2473#
2474# Great Swan I ceded by US to Honduras in 1972
2475
2476# Jamaica
2477
2478# From Bob Devine (1988-01-28):
2479# Follows US rules.
2480
2481# From U. S. Naval Observatory (1989-01-19):
2482# JAMAICA 5 H BEHIND UTC
2483
2484# From Shanks & Pottenger:
2485# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2486Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
2487 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2488 -5:00 - EST 1974 Apr 28 2:00
2489 -5:00 US E%sT 1984
2490 -5:00 - EST
2491
2492# Martinique
2493# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2494Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
2495 -4:04:20 - FFMT 1911 May # Fort-de-France MT
2496 -4:00 - AST 1980 Apr 6
2497 -4:00 1:00 ADT 1980 Sep 28
2498 -4:00 - AST
2499
2500# Montserrat
2501# From Paul Eggert (2006-03-22):
2502# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
2503# world.gazetteer.com says Cork Hill is the most populous location now.
2504# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2505Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
2506 -4:00 - AST
2507
2508# Nicaragua
2509#
2510# This uses Shanks & Pottenger for times before 2005.
2511#
2512# From Steffen Thorsen (2005-04-12):
2513# I've got reports from 8 different people that Nicaragua just started
2514# DST on Sunday 2005-04-10, in order to save energy because of
2515# expensive petroleum. The exact end date for DST is not yet
2516# announced, only "September" but some sites also say "mid-September".
2517# Some background information is available on the President's official site:
2518# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
2519# The Decree, no 23-2005 is available here:
2520# 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
2521#
2522# From Paul Eggert (2005-05-01):
2523# The decree doesn't say anything about daylight saving, but for now let's
2524# assume that it is daylight saving....
2525#
2526# From Gwillim Law (2005-04-21):
2527# The Associated Press story on the time change, which can be found at
2528# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
2529# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
2530# time that a change of clocks was applied to save energy was in the year 2000
2531# during the Arnoldo Aleman administration."...
2532# The northamerica file says that Nicaragua has been on UTC-6 continuously
2533# since December 1998. I wasn't able to find any details of Nicaraguan time
2534# changes in 2000. Perhaps a note could be added to the northamerica file, to
2535# the effect that we have indirect evidence that DST was observed in 2000.
2536#
2537# From Jesper Norgaard Welen (2005-11-02):
2538# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
2539# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
2540# (2005-09-26)
2541#
2542# From Jesper Norgaard Welen (2006-05-05):
2543# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
2544# (my informal translation)
2545# By order of the president of the republic, Enrique Bolanos, Nicaragua
2546# advanced by sixty minutes their official time, yesterday at 2 in the
2547# morning, and will stay that way until 30.th. of september.
2548#
2549# From Jesper Norgaard Welen (2006-09-30):
2550# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
2551# My informal translation runs:
2552# The natural sun time is restored in all the national territory, in that the
2553# time is returned one hour at 01:00 am of October 1 of 2006.
2554#
2555# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2556Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
2557Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
2558Rule Nic 2005 only - Apr 10 0:00 1:00 D
2559Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
2560Rule Nic 2006 only - Apr 30 2:00 1:00 D
2561Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
2562# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2563Zone America/Managua -5:45:08 - LMT 1890
2564 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
2565 -6:00 - CST 1973 May
2566 -5:00 - EST 1975 Feb 16
2567 -6:00 Nic C%sT 1992 Jan 1 4:00
2568 -5:00 - EST 1992 Sep 24
2569 -6:00 - CST 1993
2570 -5:00 - EST 1997
2571 -6:00 Nic C%sT
2572
2573# Panama
2574# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2575Zone America/Panama -5:18:08 - LMT 1890
2576 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
2577 -5:00 - EST
2578
2579# Puerto Rico
2580# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
2581# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2582Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
2583 -4:00 - AST 1942 May 3
2584 -4:00 US A%sT 1946
2585 -4:00 - AST
2586
2587# St Kitts-Nevis
2588# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2589Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
2590 -4:00 - AST
2591
2592# St Lucia
2593# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2594Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
2595 -4:04:00 - CMT 1912 # Castries Mean Time
2596 -4:00 - AST
2597
2598# St Pierre and Miquelon
2599# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
2600# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2601Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
2602 -4:00 - AST 1980 May
2603 -3:00 - PMST 1987 # Pierre & Miquelon Time
2604 -3:00 Canada PM%sT
2605
2606# St Vincent and the Grenadines
2607# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2608Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
2609 -4:04:56 - KMT 1912 # Kingstown Mean Time
2610 -4:00 - AST
2611
2612# Turks and Caicos
2613#
2614# From Chris Dunn in
2615# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
2616# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
2617# daylight saving dates for time changes have been adjusted to match
2618# the recent U.S. change of dates.
2619#
2620# From Brian Inglis (2007-04-28):
2621# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
2622# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
2623# rows before that there is an out of date entry for Oct:
2624# "Eastern Standard Times Begins 2007
2625# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
2626# indicating that the normal ET rules are followed.
2627#
2628# From Paul Eggert (2006-05-01):
2629# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
2630# says they switch at midnight. Go with Shanks & Pottenger.
2631#
2632# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2633Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
2634Rule TC 1979 2006 - Oct lastSun 2:00 0 S
2635Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
2636Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
2637Rule TC 2007 max - Nov Sun>=1 2:00 0 S
2638# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2639Zone America/Grand_Turk -4:44:32 - LMT 1890
2640 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2641 -5:00 TC E%sT
2642
2643# British Virgin Is
2644# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2645Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
2646 -4:00 - AST
2647
2648# Virgin Is
2649# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2650Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
2651 -4:00 - AST
2081# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2082Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
2083 -5:00 Bahamas E%sT 1976
2084 -5:00 US E%sT
2085
2086# Barbados
2087# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2088Rule Barb 1977 only - Jun 12 2:00 1:00 D
2089Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2090Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2091Rule Barb 1979 only - Sep 30 2:00 0 S
2092Rule Barb 1980 only - Sep 25 2:00 0 S
2093# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2094Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
2095 -3:58:28 - BMT 1932 # Bridgetown Mean Time
2096 -4:00 Barb A%sT
2097
2098# Belize
2099# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2100# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2101Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2102Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2103Rule Belize 1973 only - Dec 5 0:00 1:00 D
2104Rule Belize 1974 only - Feb 9 0:00 0 S
2105Rule Belize 1982 only - Dec 18 0:00 1:00 D
2106Rule Belize 1983 only - Feb 12 0:00 0 S
2107# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2108Zone America/Belize -5:52:48 - LMT 1912 Apr
2109 -6:00 Belize C%sT
2110
2111# Bermuda
2112
2113# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2114
2115# Next year, however, clocks in the US will go forward on the second Sunday
2116# in March, until the first Sunday in November. And, after the Time Zone
2117# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2118# Friday, the same thing will happen in Bermuda.
2119# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2120
2121# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2122Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
2123 -4:00 - AST 1974 Apr 28 2:00
2124 -4:00 Bahamas A%sT 1976
2125 -4:00 US A%sT
2126
2127# Cayman Is
2128# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2129Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2130 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2131 -5:00 - EST
2132
2133# Costa Rica
2134# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2135Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2136Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2137Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2138# IATA SSIM (1991-09) says the following was at 1:00;
2139# go with Shanks & Pottenger.
2140Rule CR 1991 only - Jul 1 0:00 0 S
2141Rule CR 1992 only - Mar 15 0:00 0 S
2142# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2143# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2144Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
2145 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
2146 -6:00 CR C%sT
2147# Coco
2148# no information; probably like America/Costa_Rica
2149
2150# Cuba
2151
2152# From Arthur David Olson (1999-03-29):
2153# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2154# the Cuban National Team and the Baltimore Orioles was carried live on
2155# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2156# During the game, play-by-play announcer Jim Hunter noted that
2157# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2158# Time today." (The "two hour" remark referred to losing one hour of
2159# sleep on 1999-03-28--when the announcers were in Cuba as it switched
2160# to DST--and one more hour on 1999-04-04--when the announcers will have
2161# returned to Baltimore, which switches on that date.)
2162
2163# From Evert van der Veer via Steffen Thorsen (2004-10-28):
2164# Cuba is not going back to standard time this year.
2165# From Paul Eggert (2006-03-22):
2166# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2167# says that it's due to a problem at the Antonio Guiteras
2168# thermoelectric plant, and says "This October there will be no return
2169# to normal hours (after daylight saving time)".
2170# For now, let's assume that it's a temporary measure.
2171
2172# From Carlos A. Carnero Delgado (2005-11-12):
2173# This year (just like in 2004-2005) there's no change in time zone
2174# adjustment in Cuba. We will stay in daylight saving time:
2175# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2176
2177# From Jesper Norgaard Welen (2006-10-21):
2178# An article in GRANMA INTERNACIONAL claims that Cuba will end
2179# the 3 years of permanent DST next weekend, see
2180# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2181# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2182# watches should be set back one hour -- going back to 00:00 hours -- returning
2183# to the normal schedule....
2184
2185# From Paul Eggert (2007-03-02):
2186# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2187# says Cuban clocks will advance at midnight on March 10.
2188# For lack of better information, assume Cuba will use US rules,
2189# except that it switches at midnight standard time as usual.
2190#
2191# From Steffen Thorsen (2007-10-25):
2192# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2193# earlier - on the last Sunday of October, just like in 2006.
2194#
2195# He supplied these references:
2196#
2197# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2198# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2199#
2200# From Alex Kryvenishev (2007-10-25):
2201# Here is also article from Granma (Cuba):
2202#
2203# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2204# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2205#
2206# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2207
2208# From Arthur David Olson (2008-03-09):
2209# I'm in Maryland which is now observing United States Eastern Daylight
2210# Time. At 9:44 local time I used RealPlayer to listen to
2211# <a href="http://media.enet.cu/radioreloj">
2212# http://media.enet.cu/radioreloj
2213# </a>, a Cuban information station, and heard
2214# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2215# indicating that Cuba is still on standard time.
2216
2217# From Steffen Thorsen (2008-03-12):
2218# It seems that Cuba will start DST on Sunday, 2007-03-16...
2219# It was announced yesterday, according to this source (in Spanish):
2220# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2221# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2222# </a>
2223#
2224# Some more background information is posted here:
2225# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2226# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2227# </a>
2228#
2229# The article also says that Cuba has been observing DST since 1963,
2230# while Shanks (and tzdata) has 1965 as the first date (except in the
2231# 1940's). Many other web pages in Cuba also claim that it has been
2232# observed since 1963, but with the exception of 1970 - an exception
2233# which is not present in tzdata/Shanks. So there is a chance we need to
2234# change some historic records as well.
2235#
2236# One example:
2237# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2238# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2239# </a>
2240
2241# From Jesper Norgaard Welen (2008-03-13):
2242# The Cuban time change has just been confirmed on the most authoritative
2243# web site, the Granma. Please check out
2244# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2245# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2246# </a>
2247#
2248# Basically as expected after Steffen Thorsens information, the change
2249# will take place midnight between Saturday and Sunday.
2250
2251# From Arthur David Olson (2008-03-12):
2252# Assume Sun>=15 (third Sunday) going forward.
2253
2254# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2255Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2256Rule Cuba 1928 only - Oct 10 0:00 0 S
2257Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2258Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2259Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2260Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2261Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2262Rule Cuba 1965 only - Sep 30 0:00 0 S
2263Rule Cuba 1966 only - May 29 0:00 1:00 D
2264Rule Cuba 1966 only - Oct 2 0:00 0 S
2265Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2266Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2267Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2268Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2269Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2270Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2271Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2272Rule Cuba 1978 only - May 7 0:00 1:00 D
2273Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2274Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2275Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2276Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2277Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2278Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2279Rule Cuba 1996 only - Oct 6 0:00s 0 S
2280Rule Cuba 1997 only - Oct 12 0:00s 0 S
2281Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2282Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2283Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D
2284Rule Cuba 2006 max - Oct lastSun 0:00s 0 S
2285Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2286Rule Cuba 2008 max - Mar Sun>=15 0:00s 1:00 D
2287
2288# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2289Zone America/Havana -5:29:28 - LMT 1890
2290 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2291 -5:00 Cuba C%sT
2292
2293# Dominica
2294# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2295Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2296 -4:00 - AST
2297
2298# Dominican Republic
2299
2300# From Steffen Thorsen (2000-10-30):
2301# Enrique Morales reported to me that the Dominican Republic has changed the
2302# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2303# http://www.listin.com.do/antes/261000/republica/princi.html
2304
2305# From Paul Eggert (2000-12-04):
2306# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2307
2308# From Rives McDow (2000-12-01):
2309# Dominican Republic changed its mind and presidential decree on Tuesday,
2310# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2311# Dominican Republic will be reverting to 8 hours from the International Date
2312# Line, and will not be using DST in the foreseeable future. The reason they
2313# decided to use DST was to be in synch with Puerto Rico, who was also going
2314# to implement DST. When Puerto Rico didn't implement DST, the president
2315# decided to revert.
2316
2317
2318# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2319Rule DR 1966 only - Oct 30 0:00 1:00 D
2320Rule DR 1967 only - Feb 28 0:00 0 S
2321Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2322Rule DR 1970 only - Feb 21 0:00 0 S
2323Rule DR 1971 only - Jan 20 0:00 0 S
2324Rule DR 1972 1974 - Jan 21 0:00 0 S
2325# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2326Zone America/Santo_Domingo -4:39:36 - LMT 1890
2327 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2328 -5:00 DR E%sT 1974 Oct 27
2329 -4:00 - AST 2000 Oct 29 02:00
2330 -5:00 US E%sT 2000 Dec 3 01:00
2331 -4:00 - AST
2332
2333# El Salvador
2334
2335# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2336Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2337Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2338# There are too many San Salvadors elsewhere, so use America/El_Salvador
2339# instead of America/San_Salvador.
2340# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2341Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2342 -6:00 Salv C%sT
2343
2344# Grenada
2345# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2346Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2347 -4:00 - AST
2348
2349# Guadeloupe
2350# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2351Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2352 -4:00 - AST
2353# St Barthelemy
2354Link America/Guadeloupe America/St_Barthelemy
2355# St Martin (French part)
2356Link America/Guadeloupe America/Marigot
2357
2358# Guatemala
2359#
2360# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2361# Diario Co Latino, at
2362# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2363# says in an article dated 2006-04-19 that the Guatemalan government had
2364# decided on that date to advance official time by 60 minutes, to lessen the
2365# impact of the elevated cost of oil.... Daylight saving time will last from
2366# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2367# From Paul Eggert (2006-06-22):
2368# The Ministry of Energy and Mines, press release CP-15/2006
2369# (2006-04-19), says DST ends at 24:00. See
2370# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2371
2372# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2373Rule Guat 1973 only - Nov 25 0:00 1:00 D
2374Rule Guat 1974 only - Feb 24 0:00 0 S
2375Rule Guat 1983 only - May 21 0:00 1:00 D
2376Rule Guat 1983 only - Sep 22 0:00 0 S
2377Rule Guat 1991 only - Mar 23 0:00 1:00 D
2378Rule Guat 1991 only - Sep 7 0:00 0 S
2379Rule Guat 2006 only - Apr 30 0:00 1:00 D
2380Rule Guat 2006 only - Oct 1 0:00 0 S
2381# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2382Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2383 -6:00 Guat C%sT
2384
2385# Haiti
2386# From Gwillim Law (2005-04-15):
2387# Risto O. Nykanen wrote me that Haiti is now on DST.
2388# I searched for confirmation, and I found a
2389# <a href="http://www.haitianconsulate.org/time.doc"> press release
2390# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2391# </a>. Translated from French, it says:
2392#
2393# "The Prime Minister's Communication Office notifies the public in general
2394# and the press in particular that, following a decision of the Interior
2395# Ministry and the Territorial Collectivities [I suppose that means the
2396# provinces], Haiti will move to Eastern Daylight Time in the night from next
2397# Saturday the 2nd to Sunday the 3rd.
2398#
2399# "Consequently, the Prime Minister's Communication Office wishes to inform
2400# the population that the country's clocks will be set forward one hour
2401# starting at midnight. This provision will hold until the last Saturday in
2402# October 2005.
2403#
2404# "Port-au-Prince, March 31, 2005"
2405#
2406# From Steffen Thorsen (2006-04-04):
2407# I have been informed by users that Haiti observes DST this year like
2408# last year, so the current "only" rule for 2005 might be changed to a
2409# "max" rule or to last until 2006. (Who knows if they will observe DST
2410# next year or if they will extend their DST like US/Canada next year).
2411#
2412# I have found this article about it (in French):
2413# http://www.haitipressnetwork.com/news.cfm?articleID=7612
2414#
2415# The reason seems to be an energy crisis.
2416
2417# From Stephen Colebourne (2007-02-22):
2418# Some IATA info: Haiti won't be having DST in 2007.
2419
2420
2421# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2422Rule Haiti 1983 only - May 8 0:00 1:00 D
2423Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
2424Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
2425# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
2426# Go with IATA.
2427Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
2428Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
2429Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
2430Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
2431# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2432Zone America/Port-au-Prince -4:49:20 - LMT 1890
2433 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
2434 -5:00 Haiti E%sT
2435
2436# Honduras
2437# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
2438
2439# From Paul Eggert (2006-05-05):
2440# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
2441# saying Honduras will start using DST midnight Saturday, effective 4
2442# months until September. La Tribuna reported today
2443# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
2444# of Honduras, refused to back down on this.
2445
2446# From Jesper Norgaard Welen (2006-08-08):
2447# It seems that Honduras has returned from DST to standard time this Monday at
2448# 00:00 hours (prolonging Sunday to 25 hours duration).
2449# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
2450
2451# From Paul Eggert (2006-08-08):
2452# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
2453# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
2454# It mentions executive decree 18-2006.
2455
2456# From Steffen Thorsen (2006-08-17):
2457# Honduras will observe DST from 2007 to 2009, exact dates are not
2458# published, I have located this authoritative source:
2459# http://www.presidencia.gob.hn/noticia.aspx?nId=47
2460
2461# From Steffen Thorsen (2007-03-30):
2462# http://www.laprensahn.com/pais_nota.php?id04962=7386
2463# So it seems that Honduras will not enter DST this year....
2464
2465# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2466Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
2467Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
2468Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
2469Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
2470# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2471Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
2472 -6:00 Hond C%sT
2473#
2474# Great Swan I ceded by US to Honduras in 1972
2475
2476# Jamaica
2477
2478# From Bob Devine (1988-01-28):
2479# Follows US rules.
2480
2481# From U. S. Naval Observatory (1989-01-19):
2482# JAMAICA 5 H BEHIND UTC
2483
2484# From Shanks & Pottenger:
2485# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2486Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
2487 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2488 -5:00 - EST 1974 Apr 28 2:00
2489 -5:00 US E%sT 1984
2490 -5:00 - EST
2491
2492# Martinique
2493# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2494Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
2495 -4:04:20 - FFMT 1911 May # Fort-de-France MT
2496 -4:00 - AST 1980 Apr 6
2497 -4:00 1:00 ADT 1980 Sep 28
2498 -4:00 - AST
2499
2500# Montserrat
2501# From Paul Eggert (2006-03-22):
2502# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
2503# world.gazetteer.com says Cork Hill is the most populous location now.
2504# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2505Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
2506 -4:00 - AST
2507
2508# Nicaragua
2509#
2510# This uses Shanks & Pottenger for times before 2005.
2511#
2512# From Steffen Thorsen (2005-04-12):
2513# I've got reports from 8 different people that Nicaragua just started
2514# DST on Sunday 2005-04-10, in order to save energy because of
2515# expensive petroleum. The exact end date for DST is not yet
2516# announced, only "September" but some sites also say "mid-September".
2517# Some background information is available on the President's official site:
2518# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
2519# The Decree, no 23-2005 is available here:
2520# 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
2521#
2522# From Paul Eggert (2005-05-01):
2523# The decree doesn't say anything about daylight saving, but for now let's
2524# assume that it is daylight saving....
2525#
2526# From Gwillim Law (2005-04-21):
2527# The Associated Press story on the time change, which can be found at
2528# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
2529# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
2530# time that a change of clocks was applied to save energy was in the year 2000
2531# during the Arnoldo Aleman administration."...
2532# The northamerica file says that Nicaragua has been on UTC-6 continuously
2533# since December 1998. I wasn't able to find any details of Nicaraguan time
2534# changes in 2000. Perhaps a note could be added to the northamerica file, to
2535# the effect that we have indirect evidence that DST was observed in 2000.
2536#
2537# From Jesper Norgaard Welen (2005-11-02):
2538# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
2539# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
2540# (2005-09-26)
2541#
2542# From Jesper Norgaard Welen (2006-05-05):
2543# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
2544# (my informal translation)
2545# By order of the president of the republic, Enrique Bolanos, Nicaragua
2546# advanced by sixty minutes their official time, yesterday at 2 in the
2547# morning, and will stay that way until 30.th. of september.
2548#
2549# From Jesper Norgaard Welen (2006-09-30):
2550# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
2551# My informal translation runs:
2552# The natural sun time is restored in all the national territory, in that the
2553# time is returned one hour at 01:00 am of October 1 of 2006.
2554#
2555# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2556Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
2557Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
2558Rule Nic 2005 only - Apr 10 0:00 1:00 D
2559Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
2560Rule Nic 2006 only - Apr 30 2:00 1:00 D
2561Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
2562# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2563Zone America/Managua -5:45:08 - LMT 1890
2564 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
2565 -6:00 - CST 1973 May
2566 -5:00 - EST 1975 Feb 16
2567 -6:00 Nic C%sT 1992 Jan 1 4:00
2568 -5:00 - EST 1992 Sep 24
2569 -6:00 - CST 1993
2570 -5:00 - EST 1997
2571 -6:00 Nic C%sT
2572
2573# Panama
2574# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2575Zone America/Panama -5:18:08 - LMT 1890
2576 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
2577 -5:00 - EST
2578
2579# Puerto Rico
2580# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
2581# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2582Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
2583 -4:00 - AST 1942 May 3
2584 -4:00 US A%sT 1946
2585 -4:00 - AST
2586
2587# St Kitts-Nevis
2588# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2589Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
2590 -4:00 - AST
2591
2592# St Lucia
2593# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2594Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
2595 -4:04:00 - CMT 1912 # Castries Mean Time
2596 -4:00 - AST
2597
2598# St Pierre and Miquelon
2599# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
2600# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2601Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
2602 -4:00 - AST 1980 May
2603 -3:00 - PMST 1987 # Pierre & Miquelon Time
2604 -3:00 Canada PM%sT
2605
2606# St Vincent and the Grenadines
2607# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2608Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
2609 -4:04:56 - KMT 1912 # Kingstown Mean Time
2610 -4:00 - AST
2611
2612# Turks and Caicos
2613#
2614# From Chris Dunn in
2615# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
2616# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
2617# daylight saving dates for time changes have been adjusted to match
2618# the recent U.S. change of dates.
2619#
2620# From Brian Inglis (2007-04-28):
2621# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
2622# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
2623# rows before that there is an out of date entry for Oct:
2624# "Eastern Standard Times Begins 2007
2625# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
2626# indicating that the normal ET rules are followed.
2627#
2628# From Paul Eggert (2006-05-01):
2629# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
2630# says they switch at midnight. Go with Shanks & Pottenger.
2631#
2632# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2633Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
2634Rule TC 1979 2006 - Oct lastSun 2:00 0 S
2635Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
2636Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
2637Rule TC 2007 max - Nov Sun>=1 2:00 0 S
2638# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2639Zone America/Grand_Turk -4:44:32 - LMT 1890
2640 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2641 -5:00 TC E%sT
2642
2643# British Virgin Is
2644# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2645Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
2646 -4:00 - AST
2647
2648# Virgin Is
2649# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2650Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
2651 -4:00 - AST