| blob | 73e2470e0b1c19a08ee70b7154be254a36bf585a |
1 # @(#)northamerica 8.1
2 # <pre>
4 # also includes Central America and the Caribbean
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).
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).
14 ###############################################################################
16 # United States
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.
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).
33 # From Paul Eggert (1995-12-19):
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 and Puerto Rico entries below.
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".
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.
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.
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.
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.
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.
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.
121 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
122 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
123 Rule US 1918 1919 - Oct lastSun 2:00 0 S
124 Rule US 1942 only - Feb 9 2:00 1:00 W # War
125 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
126 Rule US 1945 only - Sep 30 2:00 0 S
127 Rule US 1967 2006 - Oct lastSun 2:00 0 S
128 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
129 Rule US 1974 only - Jan 6 2:00 1:00 D
130 Rule US 1975 only - Feb 23 2:00 1:00 D
131 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
132 Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
133 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
134 Rule US 2007 max - Nov Sun>=1 2:00 0 S
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.
147 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
148 Zone EST -5:00 - EST
149 Zone MST -7:00 - MST
150 Zone HST -10:00 - HST
151 Zone EST5EDT -5:00 US E%sT
152 Zone CST6CDT -6:00 US C%sT
153 Zone MST7MDT -7:00 US M%sT
154 Zone PST8PDT -8:00 US P%sT
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.
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.
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
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.
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".
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.
253 # US eastern time, represented by New York
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
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.
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."
279 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
280 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
281 Rule NYC 1920 only - Oct lastSun 2:00 0 S
282 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
283 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
284 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
285 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
286 Zone 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
293 # US central time, represented by Chicago
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
304 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
305 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
306 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
307 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
308 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
309 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
310 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
311 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
312 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
313 -6:00 US C%sT 1920
314 -6:00 Chicago C%sT 1936 Mar 1 2:00
315 -5:00 - EST 1936 Nov 15 2:00
316 -6:00 Chicago C%sT 1942
317 -6:00 US C%sT 1946
318 -6:00 Chicago C%sT 1967
319 -6:00 US C%sT
320 # Oliver County, ND switched from mountain to central time on 1992-10-25.
321 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
322 -7:00 US M%sT 1992 Oct 25 02:00
323 -6:00 US C%sT
324 # From Paul Eggert (2006-01-20):
325 # The following is not implemented yet.
326 # What is the most populous city in that area?
327 # From http://www.statoids.com/tus.html (2006-01-20):
328 # 2003-10-26 02:00: All of Morton County, ND, and the part of Sioux
329 # County, ND east of ND route 31 moved from MT to CT. (The area
330 # around Fort Yates in Sioux County and the area around Mandan in
331 # Morton County were already in CT.)
333 # US mountain time, represented by Denver
334 #
335 # Colorado, far western Kansas, Montana, western
336 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
337 # New Mexico, southwestern North Dakota, far eastern Oregon,
338 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
339 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
340 #
341 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
342 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
343 Rule Denver 1920 only - Oct lastSun 2:00 0 S
344 Rule Denver 1921 only - May 22 2:00 0 S
345 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
346 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
347 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
348 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
349 -7:00 US M%sT 1920
350 -7:00 Denver M%sT 1942
351 -7:00 US M%sT 1946
352 -7:00 Denver M%sT 1967
353 -7:00 US M%sT
355 # US Pacific time, represented by Los Angeles
356 #
357 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
358 # Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties),
359 # most of Nevada, most of Oregon, and Washington
360 #
361 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
362 Rule CA 1948 only - Mar 14 2:00 1:00 D
363 Rule CA 1949 only - Jan 1 2:00 0 S
364 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
365 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
366 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
367 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
368 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
369 -8:00 US P%sT 1946
370 -8:00 CA P%sT 1967
371 -8:00 US P%sT
373 # Alaska
374 # AK%sT is the modern abbreviation for -9:00 per USNO.
375 #
376 # From Paul Eggert (2001-05-30):
377 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
378 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
379 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
380 # also a Friday. Include only the time zone part of this transition,
381 # ignoring the switch from Julian to Gregorian, since we can't represent
382 # the Julian calendar.
383 #
384 # As far as we know, none of the exact locations mentioned below were
385 # permanently inhabited in 1867 by anyone using either calendar.
386 # (Yakutat was colonized by the Russians in 1799, but the settlement
387 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
388 # were nearby inhabitants in some cases and for our purposes perhaps
389 # it's best to simply use the official transition.
390 #
391 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
392 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
393 -8:57:41 - LMT 1900 Aug 20 12:00
394 -8:00 - PST 1942
395 -8:00 US P%sT 1946
396 -8:00 - PST 1969
397 -8:00 US P%sT 1983 Oct 30 2:00
398 -9:00 US Y%sT 1983 Nov 30
399 -9:00 US AK%sT
400 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
401 -9:18:55 - LMT 1900 Aug 20 12:00
402 -9:00 - YST 1942
403 -9:00 US Y%sT 1946
404 -9:00 - YST 1969
405 -9:00 US Y%sT 1983 Nov 30
406 -9:00 US AK%sT
407 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
408 -9:59:36 - LMT 1900 Aug 20 12:00
409 -10:00 - CAT 1942
410 -10:00 US CAT/CAWT 1946
411 -10:00 - CAT 1967 Apr
412 -10:00 - AHST 1969
413 -10:00 US AH%sT 1983 Oct 30 2:00
414 -9:00 US Y%sT 1983 Nov 30
415 -9:00 US AK%sT
416 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
417 -11:01:38 - LMT 1900 Aug 20 12:00
418 -11:00 - NST 1942
419 -11:00 US N%sT 1946
420 -11:00 - NST 1967 Apr
421 -11:00 - BST 1969
422 -11:00 US B%sT 1983 Oct 30 2:00
423 -9:00 US Y%sT 1983 Nov 30
424 -9:00 US AK%sT
425 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
426 -11:46:38 - LMT 1900 Aug 20 12:00
427 -11:00 - NST 1942
428 -11:00 US N%sT 1946
429 -11:00 - NST 1967 Apr
430 -11:00 - BST 1969
431 -11:00 US B%sT 1983 Oct 30 2:00
432 -10:00 US AH%sT 1983 Nov 30
433 -10:00 US HA%sT
434 # The following switches don't quite make our 1970 cutoff.
435 #
436 # Shanks writes that part of southwest Alaska (e.g. Aniak)
437 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
438 # and another part (e.g. Akiak) made the same switch five weeks later.
439 #
440 # From David Flater (2004-11-09):
441 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
442 # Historic Preservation Commission, provided this information, which
443 # suggests that Unalaska deviated from statutory time from early 1967
444 # possibly until 1983:
445 #
446 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
447 # "Except for St. Paul and Akutan, Unalaska is the only important
448 # location not on Alaska Standard Time. The following resolution was
449 # made by William Robinson and seconded by Henry Swanson: Be it
450 # resolved that the City of Unalaska hereby goes to Alaska Standard
451 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
452 # January 14, Alaska Standard Time.) This resolution was passed with
453 # three votes for and one against."
455 # Hawaii
456 #
457 # From Arthur David Olson:
458 # And then there's Hawaii.
459 # DST was observed for one day in 1933;
460 # standard time was changed by half an hour in 1947;
461 # it's always standard as of 1986.
462 #
463 # From Paul Eggert:
464 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
465 #
466 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
467 -10:30 - HST 1933 Apr 30 2:00
468 -10:30 1:00 HDT 1933 May 21 2:00
469 -10:30 US H%sT 1947 Jun 8 2:00
470 -10:00 - HST
472 # Now we turn to US areas that have diverged from the consensus since 1970.
474 # Arizona mostly uses MST.
476 # From Paul Eggert (2002-10-20):
477 #
478 # The information in the rest of this paragraph is derived from the
479 # <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
480 # Daylight Saving Time web page (2002-01-23)</a> maintained by the
481 # Arizona State Library, Archives and Public Records.
482 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
483 # time, but by federal law railroads, airlines, bus lines, military
484 # personnel, and some engaged in interstate commerce continued to
485 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
486 # Gazette says that was the date the law changed, and that 04-01 was
487 # the date the state's clocks would change. In 1945 the State of
488 # Arizona used standard time all year, again with exceptions only as
489 # mandated by federal law. Arizona observed DST in 1967, but Arizona
490 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
491 #
492 # Shanks says the 1944 experiment came to an end on 1944-03-17.
493 # Go with the Arizona State Library instead.
495 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
496 -7:00 US M%sT 1944 Jan 1 00:01
497 -7:00 - MST 1944 Apr 1 00:01
498 -7:00 US M%sT 1944 Oct 1 00:01
499 -7:00 - MST 1967
500 -7:00 US M%sT 1968 Mar 21
501 -7:00 - MST
502 # From Arthur David Olson (1988-02-13):
503 # A writer from the Inter Tribal Council of Arizona, Inc.,
504 # notes in private correspondence dated 1987-12-28 that "Presently, only the
505 # Navajo Nation participates in the Daylight Saving Time policy, due to its
506 # large size and location in three states." (The "only" means that other
507 # tribal nations don't use DST.)
509 Link America/Denver America/Shiprock
511 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
512 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
513 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
514 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
515 # Teton, Twin Falls, Valley, Washington counties) and eastern Oregon
516 # switched four weeks late in 1974.
517 #
518 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
519 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
520 -8:00 US P%sT 1923 May 13 2:00
521 -7:00 US M%sT 1974
522 -7:00 - MST 1974 Feb 3 2:00
523 -7:00 US M%sT
525 # Indiana
526 #
527 # For a map of Indiana's time zone regions, see:
528 # <a href="http://www.mccsc.edu/time.html">
529 # What time is it in Indiana?
530 # </a> (2005-10-30)
531 #
532 # From Paul Eggert (2006-01-20):
533 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
534 # with the following exceptions:
535 #
536 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
537 # Vandenburgh, and Warrick counties have been like America/Chicago.
538 #
539 # - Dearborn and Ohio counties have been like America/New_York.
540 #
541 # - Clark, Floyd, and Harrison counties have been like
542 # America/Kentucky/Louisville.
543 #
544 # - Daviess, Dubois, Knox, Martin, Perry, and Pulaski counties
545 # have been like America/Indiana/Vincennes.
546 #
547 # - Crawford, Pike, Starke, and Switzerland counties have their own time zone
548 # histories as noted below.
549 #
550 # Shanks partitioned Indiana into 345 regions, each with its own time history,
551 # and wrote ``Even newspaper reports present contradictory information.''
552 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
553 #
554 # Other than Indianapolis, the Indiana place names are so nondescript
555 # that they would be ambiguous if we left them at the `America' level.
556 # So we reluctantly put them all in a subdirectory `America/Indiana'.
558 # From Paul Eggert (2005-08-16):
559 # http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
561 # From Deborah Goldsmith (2006-01-18):
562 # http://dmses.dot.gov/docimages/pdf95/382329_web.pdf
563 # From Paul Eggert (2006-01-20):
564 # It says "DOT is relocating the time zone boundary in Indiana to move Starke,
565 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
566 # Eastern Time Zone to the Central Time Zone.... The effective date of
567 # this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
568 # changeover date from standard time to Daylight Saving Time."
569 # Strictly speaking, this means the affected counties will change their
570 # clocks twice that night, but this obviously is in error. The intent
571 # is that 01:59:59 EST be followed by 02:00:00 CDT.
573 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
574 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
575 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
576 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
577 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
578 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
579 -6:00 US C%sT 1920
580 -6:00 Indianapolis C%sT 1942
581 -6:00 US C%sT 1946
582 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
583 -5:00 - EST 1957 Sep 29 2:00
584 -6:00 - CST 1958 Apr 27 2:00
585 -5:00 - EST 1969
586 -5:00 US E%sT 1971
587 -5:00 - EST 2006
588 -5:00 US E%sT
589 #
590 # Eastern Crawford County, Indiana, left its clocks alone in 1974,
591 # as well as from 1976 through 2005.
592 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
593 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
594 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
595 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
596 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
597 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
598 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
599 -6:00 US C%sT 1951
600 -6:00 Marengo C%sT 1961 Apr 30 2:00
601 -5:00 - EST 1969
602 -5:00 US E%sT 1974 Jan 6 2:00
603 -6:00 1:00 CDT 1974 Oct 27 2:00
604 -5:00 US E%sT 1976
605 -5:00 - EST 2006
606 -5:00 US E%sT
607 #
608 # Daviess, Dubois, Knox, Martin, Perry, and Pulaski Counties, Indiana,
609 # switched from eastern to central time in April 2006.
610 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
611 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
612 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
613 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
614 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
615 Rule Vincennes 1955 only - May 1 0:00 1:00 D
616 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
617 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
618 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
619 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
620 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
621 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
622 -6:00 US C%sT 1946
623 -6:00 Vincennes C%sT 1964 Apr 26 2:00
624 -5:00 - EST 1969
625 -5:00 US E%sT 1971
626 -5:00 - EST 2006 Apr 2 2:00
627 -6:00 US C%sT
628 #
629 # Pike County, Indiana moved from central to eastern time in 1977,
630 # then switched back in 2006.
631 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
632 Rule Pike 1955 only - May 1 0:00 1:00 D
633 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
634 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
635 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
636 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
637 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
638 -6:00 US C%sT 1955
639 -6:00 Pike C%sT 1965 Apr 25 2:00
640 -5:00 - EST 1966 Oct 30 2:00
641 -6:00 US C%sT 1977 Oct 30 2:00
642 -5:00 - EST 2006 Apr 2 2:00
643 -6:00 US C%sT
644 #
645 # Starke County, Indiana moved from central to eastern time in 1991,
646 # then switched back in 2006.
647 # From Arthur David Olson (1991-10-28):
648 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
649 # notes that Starke County switched from Central time to Eastern time as of
650 # 1991-10-27.
651 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
652 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
653 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
654 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
655 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
656 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
657 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
658 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
659 -6:00 US C%sT 1947
660 -6:00 Starke C%sT 1962 Apr 29 2:00
661 -5:00 - EST 1963 Oct 27 2:00
662 -6:00 US C%sT 1991 Oct 27 2:00
663 -5:00 - EST 2006 Apr 2 2:00
664 -6:00 US C%sT
665 #
666 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
667 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
668 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
669 -6:00 US C%sT 1954 Apr 25 2:00
670 -5:00 - EST 1969
671 -5:00 US E%sT 1973
672 -5:00 - EST 2006
673 -5:00 US E%sT
675 # Part of Kentucky left its clocks alone in 1974.
676 # This also includes Clark, Floyd, and Harrison counties in Indiana.
677 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
678 Rule Louisville 1921 only - May 1 2:00 1:00 D
679 Rule Louisville 1921 only - Sep 1 2:00 0 S
680 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
681 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
682 Rule Louisville 1946 only - Jun 2 2:00 0 S
683 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
684 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
685 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
686 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
687 -6:00 US C%sT 1921
688 -6:00 Louisville C%sT 1942
689 -6:00 US C%sT 1946
690 -6:00 Louisville C%sT 1961 Jul 23 2:00
691 -5:00 - EST 1968
692 -5:00 US E%sT 1974 Jan 6 2:00
693 -6:00 1:00 CDT 1974 Oct 27 2:00
694 -5:00 US E%sT
695 #
696 # Wayne County, Kentucky
697 #
698 # From
699 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
700 # Lake Cumberland LIFE
701 # </a> (1999-01-29) via WKYM-101.7:
702 # Clinton County has joined Wayne County in asking the DoT to change from
703 # the Central to the Eastern time zone.... The Wayne County government made
704 # the same request in December. And while Russell County officials have not
705 # taken action, the majority of respondents to a poll conducted there in
706 # August indicated they would like to change to "fast time" also.
707 # The three Lake Cumberland counties are the farthest east of any U.S.
708 # location in the Central time zone.
709 #
710 # From Rich Wales (2000-08-29):
711 # After prolonged debate, and despite continuing deep differences of opinion,
712 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
713 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
714 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
715 #
716 # From Paul Eggert (2001-07-16):
717 # The final rule was published in the
718 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
719 # Federal Register 65, 160 (2000-08-17), page 50154-50158.
720 # </a>
721 #
722 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
723 -6:00 US C%sT 1946
724 -6:00 - CST 1968
725 -6:00 US C%sT 2000 Oct 29 2:00
726 -5:00 US E%sT
729 # From Rives McDow (2000-08-30):
730 # Here ... are all the changes in the US since 1985.
731 # Kearny County, KS (put all of county on central;
732 # previously split between MST and CST) ... 1990-10
733 # Starke County, IN (from CST to EST) ... 1991-10
734 # Oliver County, ND (from MST to CST) ... 1992-10
735 # West Wendover, NV (from PST TO MST) ... 1999-10
736 # Wayne County, KY (from CST to EST) ... 2000-10
737 #
738 # From Paul Eggert (2001-07-17):
739 # We don't know where the line used to be within Kearny County, KS,
740 # so omit that change for now.
741 # See America/Indiana/Knox for the Starke County, IN change.
742 # See America/North_Dakota/Center for the Oliver County, ND change.
743 # West Wendover, NV officially switched from Pacific to mountain time on
744 # 1999-10-31. See the
745 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
746 # Federal Register 64, 203 (1999-10-21), page 56705-56707.
747 # </a>
748 # However, the Federal Register says that West Wendover already operated
749 # on mountain time, and the rule merely made this official;
750 # hence a separate tz entry is not needed.
752 # Michigan
753 #
754 # From Bob Devine (1988-01-28):
755 # Michigan didn't observe DST from 1968 to 1973.
756 #
757 # From Paul Eggert (1999-03-31):
758 # Shanks writes that Michigan started using standard time on 1885-09-18,
759 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
760 # that Detroit kept
761 #
762 # local time until 1900 when the City Council decreed that clocks should
763 # be put back twenty-eight minutes to Central Standard Time. Half the
764 # city obeyed, half refused. After considerable debate, the decision
765 # was rescinded and the city reverted to Sun time. A derisive offer to
766 # erect a sundial in front of the city hall was referred to the
767 # Committee on Sewers. Then, in 1905, Central time was adopted
768 # by city vote.
769 #
770 # This story is too entertaining to be false, so go with Howse over Shanks.
771 #
772 # From Paul Eggert (2001-03-06):
773 # Garland (1927) writes ``Cleveland and Detroit advanced their clocks
774 # one hour in 1914.'' This change is not in Shanks. We have no more
775 # info, so omit this for now.
776 #
777 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
778 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
779 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
780 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
781 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
782 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
783 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
784 Zone America/Detroit -5:32:11 - LMT 1905
785 -6:00 - CST 1915 May 15 2:00
786 -5:00 - EST 1942
787 -5:00 US E%sT 1946
788 -5:00 Detroit E%sT 1973
789 -5:00 US E%sT 1975
790 -5:00 - EST 1975 Apr 27 2:00
791 -5:00 US E%sT
792 #
793 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
794 # switched from EST to CST/CDT in 1973.
795 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
796 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
797 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
798 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
799 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
800 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
801 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
802 -6:00 US C%sT 1946
803 -6:00 Menominee C%sT 1969 Apr 27 2:00
804 -5:00 - EST 1973 Apr 29 2:00
805 -6:00 US C%sT
807 # Navassa
808 # administered by the US Fish and Wildlife Service
809 # claimed by US under the provisions of the 1856 Guano Islands Act
810 # also claimed by Haiti
811 # occupied 1857/1900 by the Navassa Phosphate Co
812 # US lighthouse 1917/1996-09
813 # currently uninhabited
814 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
815 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
816 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
818 ################################################################################
821 # From Paul Eggert (1999-10-29):
822 # A good source for time zone historical data outside the US is
823 # Thomas G. Shanks, The International Atlas (5th edition),
824 # San Diego: ACS Publications, Inc. (1999).
825 #
826 # Gwillim Law writes that a good source
827 # for recent time zone data is the International Air Transport
828 # Association's Standard Schedules Information Manual (IATA SSIM),
829 # published semiannually. Law sent in several helpful summaries
830 # of the IATA's data after 1990.
831 #
832 # Except where otherwise noted, Shanks is the source for entries through 1990,
833 # and IATA SSIM is the source for entries after 1990.
834 #
835 # Other sources occasionally used include:
836 #
837 # Edward W. Whitman, World Time Differences,
838 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
839 # which I found in the UCLA library.
840 #
841 # <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
842 # William Willett, The Waste of Daylight, 19th edition
843 # </a> (1914-03)
844 #
845 # See the `europe' file for Greenland.
847 # Canada
849 # From Alain LaBont<e'> (1994-11-14):
850 # I post here the time zone abbreviations standardized in Canada
851 # for both English and French in the CAN/CSA-Z234.4-89 standard....
852 #
853 # UTC Standard time Daylight savings time
854 # offset French English French English
855 # -2:30 - - HAT NDT
856 # -3 - - HAA ADT
857 # -3:30 HNT NST - -
858 # -4 HNA AST HAE EDT
859 # -5 HNE EST HAC CDT
860 # -6 HNC CST HAR MDT
861 # -7 HNR MST HAP PDT
862 # -8 HNP PST HAY YDT
863 # -9 HNY YST - -
864 #
865 # HN: Heure Normale ST: Standard Time
866 # HA: Heure Avanc<e'>e DT: Daylight saving Time
867 #
868 # A: de l'Atlantique Atlantic
869 # C: du Centre Central
870 # E: de l'Est Eastern
871 # M: Mountain
872 # N: Newfoundland
873 # P: du Pacifique Pacific
874 # R: des Rocheuses
875 # T: de Terre-Neuve
876 # Y: du Yukon Yukon
877 #
878 # From Paul Eggert (1994-11-22):
879 # Alas, this sort of thing must be handled by localization software.
881 # Unless otherwise specified, the data for Canada are all from Shanks.
883 # From Paul Eggert (2005-12-21):
884 # H. David Matthews and Mary Vincent's map
885 # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
886 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
887 # </a> contains detailed boundaries for regions observing nonstandard
888 # time and daylight saving time arrangements in Canada circa 1998.
889 #
890 # INMS, the Institute for National Measurement Standards in Ottawa, has <a
891 # href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
892 # information about standard and daylight saving time zones in Canada.
893 # </a> (updated periodically).
894 # Its unofficial information is often taken from Matthews and Vincent.
895 #
896 # CBC News reported that Ontario and Manitoba have announced plans to
897 # follow the US change, and that Nova Scotia is considering it; see
898 # <http://www.cbc.ca/news/background/daylightsavingtime/> (2005-10-21).
899 # CBC news also reported that Prince Edward Island is the first
900 # province in Atlantic Canada to follow the US change, and that Quebec
901 # had agreed; see <http://www.cbc.ca/pei/story/pe_daylight_20051207.html>
902 # (2005-12-07).
903 #
904 # To reflect all this, the Canada and Winn rules have been adjusted to
905 # agree with the 2007 US change. This means we assume most of Canada
906 # will fall into line. However, Alberta, British Columbia,
907 # Newfoundland, Northwest Territories, and Yukon already have separate
908 # rules in our database, so for now we'll leave them alone, which
909 # means that we currently assume these regions will not change their
910 # rules and will disagree with the US starting in 2007. This
911 # assumption is probably incorrect, with the possible exception of
912 # Newfoundland. We plan to adjust the Edm, Vanc, StJohns, and NT_YK
913 # rules as the corresponding provinces make their announcements.
915 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
916 Rule Canada 1918 only - Apr 14 2:00 1:00 D
917 Rule Canada 1918 only - Oct 31 2:00 0 S
918 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
919 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
920 Rule Canada 1945 only - Sep 30 2:00 0 S
921 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
922 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
923 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
924 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
925 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
928 # Newfoundland (and far southeast Labrador)
930 # From Paul Eggert (2000-10-02):
931 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
932 # but the only part of Labrador that follows the rules is the
933 # southeast corner, including Port Hope Simpson and Mary's Harbour,
934 # but excluding, say, Black Tickle.
936 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
937 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
938 Rule StJohns 1917 only - Sep 17 2:00 0 S
939 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
940 Rule StJohns 1919 only - May 5 23:00 1:00 D
941 Rule StJohns 1919 only - Aug 12 23:00 0 S
942 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
943 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
944 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
945 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks.
946 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
947 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
948 # Whitman gives the following transitions:
949 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
950 # but go with Shanks and assume they used Canadian rules.
951 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
952 # Apr 30 - Sep 24; go with Shanks.
953 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
954 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
955 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
956 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
957 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
958 # From Paul Eggert (2000-10-02):
959 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
960 # at 00:01 local time. For now, assume it started in 1987.
961 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
962 Rule StJohns 1987 max - Oct lastSun 0:01 0 S
963 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
964 Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
965 # St John's has an apostrophe, but Posix file names can't have apostrophes.
966 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
967 Zone America/St_Johns -3:30:52 - LMT 1884
968 -3:30:52 StJohns N%sT 1918
969 -3:30:52 Canada N%sT 1919
970 -3:30:52 StJohns N%sT 1935 Mar 30
971 -3:30 StJohns N%sT 1942 May 11
972 -3:30 Canada N%sT 1946
973 -3:30 StJohns N%sT
975 # most of east Labrador
977 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
978 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
979 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
980 -3:30:52 - NST 1918
981 -3:30:52 Canada N%sT 1919
982 -3:30:52 - NST 1935 Mar 30
983 -3:30 - NST 1936
984 -3:30 StJohns N%sT 1942 May 11
985 -3:30 Canada N%sT 1946
986 -3:30 StJohns N%sT 1966 Mar 15 2:00
987 -4:00 StJohns A%sT
990 # west Labrador, Nova Scotia, Prince Edward I
992 # From Paul Eggert (1996-06-12):
993 # Shanks writes that since 1970 most of this region has been like Halifax.
994 # Many locales did not observe peacetime DST until 1972;
995 # Glace Bay, NS is the largest that we know of.
996 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
997 # DST in 1971 but not 1970; for now we'll assume this is a typo.
999 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1000 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1001 Rule Halifax 1916 only - Oct 1 0:00 0 S
1002 Rule Halifax 1920 only - May 9 0:00 1:00 D
1003 Rule Halifax 1920 only - Aug 29 0:00 0 S
1004 Rule Halifax 1921 only - May 6 0:00 1:00 D
1005 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1006 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1007 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1008 Rule Halifax 1923 only - Sep 4 0:00 0 S
1009 Rule Halifax 1924 only - Sep 15 0:00 0 S
1010 Rule Halifax 1925 only - Sep 28 0:00 0 S
1011 Rule Halifax 1926 only - May 16 0:00 1:00 D
1012 Rule Halifax 1926 only - Sep 13 0:00 0 S
1013 Rule Halifax 1927 only - May 1 0:00 1:00 D
1014 Rule Halifax 1927 only - Sep 26 0:00 0 S
1015 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1016 Rule Halifax 1928 only - Sep 9 0:00 0 S
1017 Rule Halifax 1929 only - Sep 3 0:00 0 S
1018 Rule Halifax 1930 only - Sep 15 0:00 0 S
1019 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1020 Rule Halifax 1932 only - May 1 0:00 1:00 D
1021 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1022 Rule Halifax 1933 only - Oct 2 0:00 0 S
1023 Rule Halifax 1934 only - May 20 0:00 1:00 D
1024 Rule Halifax 1934 only - Sep 16 0:00 0 S
1025 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1026 Rule Halifax 1935 only - Sep 30 0:00 0 S
1027 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1028 Rule Halifax 1936 only - Sep 14 0:00 0 S
1029 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1030 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1031 Rule Halifax 1939 only - May 28 0:00 1:00 D
1032 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1033 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1034 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1035 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1036 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1037 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1038 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1039 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1040 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1041 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1042 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1043 -4:00 Halifax A%sT 1918
1044 -4:00 Canada A%sT 1919
1045 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1046 -4:00 Canada A%sT 1946
1047 -4:00 Halifax A%sT 1974
1048 -4:00 Canada A%sT
1049 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1050 -4:00 Canada A%sT 1953
1051 -4:00 Halifax A%sT 1954
1052 -4:00 - AST 1972
1053 -4:00 Halifax A%sT 1974
1054 -4:00 Canada A%sT
1056 # New Brunswick
1058 # From Paul Eggert (2006-01-20):
1059 # New Brunswick's Time Definition Act
1060 # <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> says they change at 00:01, and
1061 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1062 # clear that this has been the case since at least 1993.
1063 # For now, assume it started in 1993. The Office of the Premier announced
1064 # <http://www.gnb.ca/cnb/news/pre/2005e1737pr.htm> (2005-12-23)
1065 # that they will bring forward proposed amendments to harmonize with the US;
1066 # for now assume that this will happen, but they'll still switch at 00:01.
1068 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1069 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1070 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1071 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1072 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1073 Rule Moncton 1939 only - May 27 1:00 1:00 D
1074 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1075 Rule Moncton 1940 only - May 19 1:00 1:00 D
1076 Rule Moncton 1941 only - May 4 1:00 1:00 D
1077 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1078 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1079 Rule Moncton 1956 1972 - Oct lastSun 2:00 0 S
1080 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1081 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1082 Rule Moncton 2007 max - Mar Sun>=8 0:01 1:00 D
1083 Rule Moncton 2007 max - Nov Sun>=1 0:01 0 S
1084 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1085 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1086 -5:00 - EST 1902 Jun 15
1087 -4:00 Canada A%sT 1933
1088 -4:00 Moncton A%sT 1942
1089 -4:00 Canada A%sT 1946
1090 -4:00 Moncton A%sT 1973
1091 -4:00 Canada A%sT 1993
1092 -4:00 Moncton A%sT
1094 # Ontario, Quebec
1096 # From Paul Eggert (1996-06-12):
1097 # Shanks writes that since 1970 most of Ontario has been like Toronto,
1098 # and most of Quebec has been like Montreal.
1099 # Thunder Bay skipped DST in 1973.
1100 # Many smaller locales did not observe peacetime DST until 1974;
1101 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1102 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1104 # From Mark Brader (2003-07-26):
1105 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1106 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1107 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1108 # have already done so. In Orillia DST was to run until Saturday,
1109 # 1912-08-31 (no time mentioned), but it was met with considerable
1110 # hostility from certain segments of the public, and was revoked after
1111 # only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1112 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1113 # earlier in June).
1114 #
1115 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1117 # From Paul Eggert (1997-10-17):
1118 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1119 # says that Atikokan, Ontario currently does not observe DST,
1120 # but will vote on 11-10 whether to use EST/EDT.
1121 # He also writes that the
1122 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1123 # Ontario Time Act (1990, Chapter T.9)
1124 # </a>
1125 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1126 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1127 # concerns a non-official time observed as a matter of local practice.
1128 # For what it's worth, Shanks says that Atikokan has agreed with
1129 # Rainy River ever since standard time was introduced.
1131 # From Paul Eggert (2000-10-02):
1132 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1133 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1134 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1135 # violation of the official Ontario rules.
1136 # They also write that Quebec east of the -63 meridian is supposed to
1137 # observe AST, but residents as far east as Natashquan use EST/EDT,
1138 # and residents east of Natashquan use AST.
1139 # We probably need Zones for far east Quebec and for Atikokan,
1140 # but we don't know when their practices started.
1142 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1143 Rule Mont 1917 only - Mar 25 2:00 1:00 D
1144 Rule Mont 1917 only - Apr 24 0:00 0 S
1145 Rule Mont 1919 only - Mar 31 2:30 1:00 D
1146 Rule Mont 1919 only - Oct 25 2:30 0 S
1147 Rule Mont 1920 only - May 2 2:30 1:00 D
1148 Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1149 Rule Mont 1921 only - May 1 2:00 1:00 D
1150 Rule Mont 1922 only - Apr 30 2:00 1:00 D
1151 Rule Mont 1924 only - May 17 2:00 1:00 D
1152 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1153 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1154 # The 1927-to-1937 rules can be expressed more simply as
1155 # Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1156 # Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1157 # The rules below avoid use of 24:00
1158 # (which pre-1998 versions of zic cannot handle).
1159 Rule Mont 1927 only - May 1 0:00 1:00 D
1160 Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1161 Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1162 Rule Mont 1932 only - May 1 0:00 1:00 D
1163 Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1164 Rule Mont 1933 only - Oct 1 0:00 0 S
1165 Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1166 Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1167 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1168 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1169 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1170 Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1172 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1173 Rule Toronto 1919 only - Oct 26 0:00 0 S
1174 Rule Toronto 1920 only - May 2 2:00 1:00 D
1175 Rule Toronto 1920 only - Sep 26 0:00 0 S
1176 Rule Toronto 1921 only - May 15 2:00 1:00 D
1177 Rule Toronto 1921 only - Sep 15 2:00 0 S
1178 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1179 # Shanks says 1923-09-19; assume it's a typo and that "-16" was meant.
1180 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1181 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1182 # The 1927-to-1939 rules can be expressed more simply as
1183 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1184 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1185 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1186 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1187 # The rules below avoid use of Sun>=25
1188 # (which pre-2004 versions of zic cannot handle).
1189 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1190 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1191 Rule Toronto 1932 only - May 1 2:00 1:00 D
1192 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1193 Rule Toronto 1933 only - Oct 1 2:00 0 S
1194 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1195 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1196 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1197 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1198 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1199 Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1200 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1201 Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1202 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1203 # Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24,
1204 # but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue
1205 # of the Toronto Star, and it said that DST ended 1971-10-31 as usual.
1206 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1208 # From Paul Eggert (2003-07-27):
1209 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1210 # Port Arthur, Ontario, the principle of the Bill has been in
1211 # operation for the past three years, and in the City of Moose Jaw,
1212 # Saskatchewan, for one year."
1214 # From David Bryan via Tory Tronrud, Director/Curator,
1215 # Thunder Bay Museum (2003-11-12):
1216 # There is some suggestion, however, that, by-law or not, daylight
1217 # savings time was being practiced in Fort William and Port Arthur
1218 # before 1909.... [I]n 1910, the line between the Eastern and Central
1219 # Time Zones was permanently moved about two hundred miles west to
1220 # include the Thunder Bay area.... When Canada adopted daylight
1221 # savings time in 1916, Fort William and Port Arthur, having done so
1222 # already, did not change their clocks.... During the Second World
1223 # War,... [t]he cities agreed to implement DST during the summer
1224 # months for the remainder of the war years.
1226 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1227 Zone America/Montreal -4:54:16 - LMT 1884
1228 -5:00 Mont E%sT 1918
1229 -5:00 Canada E%sT 1919
1230 -5:00 Mont E%sT 1942 Feb 9 2:00s
1231 -5:00 Canada E%sT 1946
1232 -5:00 Mont E%sT 1974
1233 -5:00 Canada E%sT
1234 Zone America/Toronto -5:17:32 - LMT 1895
1235 -5:00 Canada E%sT 1919
1236 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1237 -5:00 Canada E%sT 1946
1238 -5:00 Toronto E%sT 1974
1239 -5:00 Canada E%sT
1240 Zone America/Thunder_Bay -5:57:00 - LMT 1895
1241 -6:00 - CST 1910
1242 -5:00 - EST 1942
1243 -5:00 Canada E%sT 1970
1244 -5:00 Mont E%sT 1973
1245 -5:00 - EST 1974
1246 -5:00 Canada E%sT
1247 Zone America/Nipigon -5:53:04 - LMT 1895
1248 -5:00 Canada E%sT 1940 Sep 29
1249 -5:00 1:00 EDT 1942 Feb 9 2:00s
1250 -5:00 Canada E%sT
1251 Zone America/Rainy_River -6:17:56 - LMT 1895
1252 -6:00 Canada C%sT 1940 Sep 29
1253 -6:00 1:00 CDT 1942 Feb 9 2:00s
1254 -6:00 Canada C%sT
1257 # Manitoba
1259 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1260 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1261 Rule Winn 1916 only - Sep 17 0:00 0 S
1262 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1263 Rule Winn 1918 only - Oct 31 2:00 0 S
1264 Rule Winn 1937 only - May 16 2:00 1:00 D
1265 Rule Winn 1937 only - Sep 26 2:00 0 S
1266 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1267 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1268 Rule Winn 1945 only - Sep lastSun 2:00 0 S
1269 Rule Winn 1946 only - May 12 2:00 1:00 D
1270 Rule Winn 1946 only - Oct 13 2:00 0 S
1271 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1272 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1273 Rule Winn 1950 only - May 1 2:00 1:00 D
1274 Rule Winn 1950 only - Sep 30 2:00 0 S
1275 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1276 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1277 Rule Winn 1959 only - Oct lastSun 2:00 0 S
1278 Rule Winn 1960 only - Sep lastSun 2:00 0 S
1279 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1280 Rule Winn 1963 only - Sep 22 2:00 0 S
1281 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
1282 Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
1283 Rule Winn 1987 2006 - Apr Sun>=1 2:00s 1:00 D
1284 # From Paul Eggert (2000-10-02):
1285 # INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
1286 # DST at 03:00 local time. For now, assume it started in 1987.
1287 Rule Winn 1987 2006 - Oct lastSun 2:00s 0 S
1288 Rule Winn 2007 max - Mar Sun>=8 2:00s 1:00 D
1289 Rule Winn 2007 max - Nov Sun>=1 2:00s 0 S
1290 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1291 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1292 -6:00 Winn C%sT
1295 # Saskatchewan
1297 # From Mark Brader (2003-07-26):
1298 # The first actual adoption of DST in Canada was at the municipal
1299 # level. As the [Toronto] Star put it (1912-06-07), "While people
1300 # elsewhere have long been talking of legislation to save daylight,
1301 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1302 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1303 # presumably late evening, as below), and would run until "the end of
1304 # the summer". The discrepancy between municipal time and railroad
1305 # time was noted.
1307 # From Paul Eggert (2003-07-27):
1308 # Willett (1914-03) notes that DST "has been in operation ... in the
1309 # City of Moose Jaw, Saskatchewan, for one year."
1311 # From Paul Eggert (2000-10-02):
1312 # Shanks writes that since 1970 most of this region has been like Regina.
1313 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1314 # Other western towns (e.g. Lloydminster) are like Edmonton.
1315 # Matthews and Vincent (1998) write that Denare Beach and Creighton
1316 # are like Winnipeg, in violation of Saskatchewan law.
1318 # From W. Jones (1992-11-06):
1319 # The. . .below is based on information I got from our law library, the
1320 # provincial archives, and the provincial Community Services department.
1321 # A precise history would require digging through newspaper archives, and
1322 # since you didn't say what you wanted, I didn't bother.
1323 #
1324 # Saskatchewan is split by a time zone meridian (105W) and over the years
1325 # the boundary became pretty ragged as communities near it reevaluated
1326 # their affiliations in one direction or the other. In 1965 a provincial
1327 # referendum favoured legislating common time practices.
1328 #
1329 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1330 # Saskatchewan 1978) was proclaimed, and established that the eastern
1331 # part of Saskatchewan would use CST year round, that districts in
1332 # northwest Saskatchewan would by default follow CST but could opt to
1333 # follow Mountain Time rules (thus 1 hour difference in the winter and
1334 # zero in the summer), and that districts in southwest Saskatchewan would
1335 # by default follow MT but could opt to follow CST.
1336 #
1337 # It took a few years for the dust to settle (I know one story of a town
1338 # on one time zone having its school in another, such that a mom had to
1339 # serve her family lunch in two shifts), but presently it seems that only
1340 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1341 # rules any more; all other districts appear to have used CST year round
1342 # since sometime in the 1960s.
1344 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1345 Rule Regina 1918 only - Apr 14 2:00 1:00 D
1346 Rule Regina 1918 only - Oct 31 2:00 0 S
1347 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1348 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1349 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1350 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1351 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1352 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1353 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1354 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1355 Rule Regina 1945 only - Sep lastSun 2:00 0 S
1356 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1357 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1358 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1359 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1360 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1361 Rule Regina 1959 only - Oct lastSun 2:00 0 S
1362 #
1363 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1364 Rule Swift 1957 only - Oct lastSun 2:00 0 S
1365 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1366 Rule Swift 1959 only - Oct lastSun 2:00 0 S
1367 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1368 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1369 Zone America/Regina -6:58:36 - LMT 1905 Sep
1370 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1371 -6:00 - CST
1372 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1373 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1374 -7:00 Regina M%sT 1950
1375 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1376 -6:00 - CST
1379 # Alberta
1381 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1382 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1383 Rule Edm 1918 only - Oct 31 2:00 0 S
1384 Rule Edm 1919 only - May 27 2:00 0 S
1385 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1386 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1387 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1388 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1389 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1390 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1391 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1392 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1393 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1394 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1395 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1396 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1397 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1398 Rule Edm 1972 max - Oct lastSun 2:00 0 S
1399 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
1400 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1401 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1402 -7:00 Edm M%sT
1405 # British Columbia
1407 # From Paul Eggert (2000-10-02):
1408 # Shanks writes that since 1970 most of this region has been like Vancouver.
1409 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1410 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1412 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1413 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1414 Rule Vanc 1918 only - Oct 31 2:00 0 S
1415 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1416 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1417 Rule Vanc 1945 only - Sep 30 2:00 0 S
1418 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1419 Rule Vanc 1946 only - Oct 13 2:00 0 S
1420 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1421 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
1422 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
1423 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1424 Zone America/Vancouver -8:12:28 - LMT 1884
1425 -8:00 Vanc P%sT
1426 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1427 -8:00 Canada P%sT 1947
1428 -8:00 Vanc P%sT 1972 Aug 30 2:00
1429 -7:00 - MST
1432 # Northwest Territories, Nunavut, Yukon
1434 # From Paul Eggert (1999-10-29):
1435 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1436 # Mathew Englander (1996-10-07) gives the following refs:
1437 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1438 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1439 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1440 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1441 # * O.I.C. 1980/02 established DST.
1442 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1443 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
1445 # From Rives McDow (1999-09-04):
1446 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1447 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1448 # Nunavut moves to single time zone Oct. 31
1449 # </a>
1450 #
1451 # From Antoine Leca (1999-09-06):
1452 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1453 # to differentiate it from the Yellowknife region.
1455 # From Paul Eggert (1999-09-20):
1456 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1457 # Basic Facts: The New Territory
1458 # </a> (1999) reports that Pangnirtung operates on eastern time,
1459 # and that Coral Harbour does not observe DST. We don't know when
1460 # Pangnirtung switched to eastern time; we'll guess 1995.
1462 # From Rives McDow (1999-11-08):
1463 # On October 31, when the rest of Nunavut went to Central time,
1464 # Pangnirtung wobbled. Here is the result of their wobble:
1465 #
1466 # The following businesses and organizations in Pangnirtung use Central Time:
1467 #
1468 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1469 # Eastern Arctic National Parks, A & D Specialist
1470 #
1471 # The following businesses and organizations in Pangnirtung use Eastern Time:
1472 #
1473 # Hamlet office, All other businesses, Both schools, Airport operator
1474 #
1475 # This has made for an interesting situation there, which warranted the news.
1476 # No one there that I spoke with seems concerned, or has plans to
1477 # change the local methods of keeping time, as it evidently does not
1478 # really interfere with any activities or make things difficult locally.
1479 # They plan to celebrate New Year's turn-over twice, one hour apart,
1480 # so it appears that the situation will last at least that long.
1481 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1482 # their senses", but the locals evidently don't see any problem with
1483 # the current state of affairs.
1485 # From Michaela Rodrigue, writing in the
1486 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1487 # Nunatsiaq News (1999-11-19)</a>:
1488 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1489 # central - or Nunavut time - for government offices, and eastern time
1490 # for municipal offices and schools.... Igloolik [was similar but then]
1491 # made the switch to central time on Saturday, Nov. 6.
1493 # From Paul Eggert (2000-10-02):
1494 # Matthews and Vincent (1998) say the following, but we lack histories
1495 # for these potential new Zones.
1496 #
1497 # The Canadian Forces station at Alert uses Eastern Time while the
1498 # handful of residents at the Eureka weather station [in the Central
1499 # zone] skip daylight savings. Baffin Island, which is crossed by the
1500 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
1501 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1502 # Central Time and Southampton Island [in the Central zone] is not
1503 # required to use daylight savings.
1505 # From
1506 # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1507 # Nunavut now has two time zones
1508 # </a> (2000-11-10):
1509 # The Nunavut government would allow its employees in Kugluktuk and
1510 # Cambridge Bay to operate on central time year-round, putting them
1511 # one hour behind the rest of Nunavut for six months during the winter.
1512 # At the end of October the two communities had rebelled against
1513 # Nunavut's unified time zone, refusing to shift to eastern time with
1514 # the rest of the territory for the winter. Cambridge Bay remained on
1515 # central time, while Kugluktuk, even farther west, reverted to
1516 # mountain time, which they had used before the advent of Nunavut's
1517 # unified time zone in 1999.
1518 #
1519 # From Rives McDow (2001-01-20), quoting the Nunavut government:
1520 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1522 # From Paul Eggert (2000-12-04):
1523 # Let's just keep track of the official times for now.
1525 # From Rives McDow (2001-03-07):
1526 # The premier of Nunavut has issued a ministerial statement advising
1527 # that effective 2001-04-01, the territory of Nunavut will revert
1528 # back to three time zones (mountain, central, and eastern). Of the
1529 # cities in Nunavut, Coral Harbor is the only one that I know of that
1530 # has said it will not observe dst, staying on EST year round. I'm
1531 # checking for more info, and will get back to you if I come up with
1532 # more.
1533 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1535 # From Gwillim Law (2005-05-21):
1536 # According to maps at
1537 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
1538 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
1539 # (both dated 2003), and
1540 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
1541 # (from a 1998 Canadian Geographic article), the de facto and de jure time
1542 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
1543 # round. Using Google, it's easy to find other websites that confirm this.
1544 # I wasn't able to find how far back this time regimen goes, but since it
1545 # predates the creation of Nunavut, it probably goes back many years....
1546 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
1547 #
1548 # From Paul Eggert (2005-07-26):
1549 # For lack of better information, assume that Southampton Island observed
1550 # daylight saving only during wartime.
1552 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1553 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1554 Rule NT_YK 1918 only - Oct 27 2:00 0 S
1555 Rule NT_YK 1919 only - May 25 2:00 1:00 D
1556 Rule NT_YK 1919 only - Nov 1 0:00 0 S
1557 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1558 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1559 Rule NT_YK 1945 only - Sep 30 2:00 0 S
1560 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1561 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1562 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1563 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
1564 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
1565 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1566 Zone America/Pangnirtung -4:22:56 - LMT 1884
1567 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1568 -5:00 Canada E%sT 1999 Oct 31 2:00
1569 -6:00 Canada C%sT 2000 Oct 29 2:00
1570 -5:00 Canada E%sT
1571 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
1572 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1573 -6:00 Canada C%sT 2000 Oct 29 2:00
1574 -5:00 Canada E%sT
1575 Zone America/Coral_Harbour -5:32:40 - LMT 1884
1576 -5:00 NT_YK E%sT 1946
1577 -5:00 - EST
1578 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
1579 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1580 -5:00 - EST 2001 Apr 1 3:00
1581 -6:00 Canada C%sT
1582 Zone America/Cambridge_Bay -7:00:20 - LMT 1884
1583 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1584 -6:00 Canada C%sT 2000 Oct 29 2:00
1585 -5:00 - EST 2000 Nov 5 0:00
1586 -6:00 - CST 2001 Apr 1 3:00
1587 -7:00 Canada M%sT
1588 Zone America/Yellowknife -7:37:24 - LMT 1884
1589 -7:00 NT_YK M%sT
1590 Zone America/Inuvik -8:54:00 - LMT 1884
1591 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1592 -7:00 NT_YK M%sT
1593 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1594 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1595 -8:00 NT_YK P%sT
1596 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1597 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1598 -8:00 NT_YK P%sT
1601 ###############################################################################
1603 # Mexico
1605 # From Paul Eggert (2001-03-05):
1606 # The Investigation and Analysis Service of the
1607 # Mexican Library of Congress (MLoC) has published a
1608 # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1609 # history of Mexican local time (in Spanish)
1610 # </a>.
1611 #
1612 # Here are the discrepancies between Shanks and the MLoC.
1613 # (In all cases we go with the MLoC.)
1614 # Shanks reports that Baja was at -8:00 in 1922/1923.
1615 # Shanks says the 1930 transition in Baja was 1930-11-16.
1616 # Shanks reports no DST during summer 1931.
1617 # Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01.
1618 # Shanks does not report transitions for Baja in 1945 or 1948.
1619 # Shanks reports southern Mexico transitions on 1981-12-01, not 12-23.
1620 # Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00
1621 # on 1997-10-26 at 02:00.
1623 # From Gwillim Law (2001-02-20):
1624 # There are some other discrepancies between the Decrees page and the
1625 # tz database. I think they can best be explained by supposing that
1626 # the researchers who prepared the Decrees page failed to find some of
1627 # the relevant documents.
1629 # From Paul Eggert (2000-07-26):
1630 # Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1631 # and 1988 DST experiments. Go with spin.com.mx.
1633 # From Alan Perry (1996-02-15):
1634 # A guy from our Mexico subsidiary finally found the Presidential Decree
1635 # outlining the timezone changes in Mexico.
1636 #
1637 # ------------- Begin Forwarded Message -------------
1638 #
1639 # I finally got my hands on the Official Presidential Decree that sets up the
1640 # rules for the DST changes. The rules are:
1641 #
1642 # 1. The country is divided in 3 timezones:
1643 # - Baja California Norte (the Mexico/BajaNorte TZ)
1644 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1645 # - The rest of the country (the Mexico/General TZ)
1646 #
1647 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1648 # at 2:00 AM, the times in each zone are as follows:
1649 # BajaNorte: GMT+7
1650 # BajaSur: GMT+6
1651 # General: GMT+5
1652 #
1653 # 3. The rest of the year, the times are as follows:
1654 # BajaNorte: GMT+8
1655 # BajaSur: GMT+7
1656 # General: GMT+6
1657 #
1658 # The Decree was published in Mexico's Official Newspaper on January 4th.
1659 #
1660 # -------------- End Forwarded Message --------------
1661 # From Paul Eggert (1996-06-12):
1662 # For an English translation of the decree, see
1663 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
1664 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1665 # </a>
1667 # From Rives McDow (1998-10-08):
1668 # The State of Quintana Roo has reverted back to central STD and DST times
1669 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
1671 # From Rives McDow (2000-01-10):
1672 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1673 # zone 5 hours from the International Date Line, and will not observe daylight
1674 # savings time so as to stay on the same time zone as the southern part of
1675 # Arizona year round.
1677 # From Jesper Norgaard, translating
1678 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1679 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
1680 # Syndicate of Education Workers, refuse to apply daylight saving each
1681 # year, so that the more than 10,000 schools work at normal hour the
1682 # whole year.
1684 # From Gwillim Law (2001-01-19):
1685 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1686 # (translated):...
1687 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1688 # that Summer Time will be reduced from seven to five months, starting
1689 # this year....
1690 # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1691 # [translated], says "summer time will ... take effect on the first Sunday
1692 # in May, and end on the last Sunday of September.
1694 # From Arthur David Olson (2001-01-25):
1695 # The 2001-01-24 traditional Washington Post contained the page one
1696 # story "Timely Issue Divides Mexicans."...
1697 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1698 # ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1699 # Mexico City and its 20 million residents on a different time than
1700 # the rest of the country..." In particular, Lopez Obrador would abolish
1701 # observation of Daylight Saving Time.
1703 # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1704 # Official statute published by the Energy Department
1705 # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1706 # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1708 # From Paul Eggert (2001-03-03):
1709 #
1710 # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1711 # James F. Smith writes in today's LA Times
1712 # </a>
1713 # * Sonora will continue to observe standard time.
1714 # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1715 # the Federal District will not adopt DST.
1716 # * 4 of 16 district leaders announced they'll ignore the decree.
1717 # * The decree does not affect federal-controlled facilities including
1718 # the airport, banks, hospitals, and schools.
1719 #
1720 # For now we'll assume that the Federal District will bow to federal rules.
1722 # From Jesper Norgaard (2001-04-01):
1723 # I found some references to the Mexican application of daylight
1724 # saving, which modifies what I had already sent you, stating earlier
1725 # that a number of northern Mexican states would go on daylight
1726 # saving. The modification reverts this to only cover Baja California
1727 # (Norte), while all other states (except Sonora, who has no daylight
1728 # saving all year) will follow the original decree of president
1729 # Vicente Fox, starting daylight saving May 6, 2001 and ending
1730 # September 30, 2001.
1731 # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1732 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1734 # From Reuters (2001-09-04):
1735 # Mexico's Supreme Court on Tuesday declared that daylight savings was
1736 # unconstitutional in Mexico City, creating the possibility the
1737 # capital will be in a different time zone from the rest of the nation
1738 # next year.... The Supreme Court's ruling takes effect at 2:00
1739 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1740 # standard time. "This is so residents of the Federal District are not
1741 # subject to unexpected time changes," a statement from the court said.
1743 # From Jesper Norgaard Welen (2002-03-12):
1744 # ... consulting my local grocery store(!) and my coworkers, they all insisted
1745 # that a new decision had been made to reinstate US style DST in Mexico....
1746 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1747 # confirms this. Sonora as usual is the only state where DST is not applied.
1749 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1750 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1751 Rule Mexico 1939 only - Jun 25 0:00 0 S
1752 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1753 Rule Mexico 1941 only - Apr 1 0:00 0 S
1754 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
1755 Rule Mexico 1944 only - May 1 0:00 0 S
1756 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1757 Rule Mexico 1950 only - Jul 30 0:00 0 S
1758 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1759 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1760 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1761 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1762 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1763 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1764 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1765 # Quintana Roo
1766 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1767 -6:00 - CST 1981 Dec 23
1768 -5:00 Mexico E%sT 1998 Aug 2 2:00
1769 -6:00 Mexico C%sT
1770 # Campeche, Yucatan
1771 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1772 -6:00 - CST 1981 Dec 23
1773 -5:00 - EST 1982 Dec 2
1774 -6:00 Mexico C%sT
1775 # Coahuila, Durango, Nuevo Leon, Tamaulipas
1776 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1777 -6:00 - CST 1988
1778 -6:00 US C%sT 1989
1779 -6:00 Mexico C%sT
1780 # Central Mexico
1781 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1782 -7:00 - MST 1927 Jun 10 23:00
1783 -6:00 - CST 1930 Nov 15
1784 -7:00 - MST 1931 May 1 23:00
1785 -6:00 - CST 1931 Oct
1786 -7:00 - MST 1932 Apr 1
1787 -6:00 Mexico C%sT 2001 Sep 30 02:00
1788 -6:00 - CST 2002 Feb 20
1789 -6:00 Mexico C%sT
1790 # Chihuahua
1791 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1792 -7:00 - MST 1927 Jun 10 23:00
1793 -6:00 - CST 1930 Nov 15
1794 -7:00 - MST 1931 May 1 23:00
1795 -6:00 - CST 1931 Oct
1796 -7:00 - MST 1932 Apr 1
1797 -6:00 - CST 1996
1798 -6:00 Mexico C%sT 1998
1799 -6:00 - CST 1998 Apr Sun>=1 3:00
1800 -7:00 Mexico M%sT
1801 # Sonora
1802 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1803 -7:00 - MST 1927 Jun 10 23:00
1804 -6:00 - CST 1930 Nov 15
1805 -7:00 - MST 1931 May 1 23:00
1806 -6:00 - CST 1931 Oct
1807 -7:00 - MST 1932 Apr 1
1808 -6:00 - CST 1942 Apr 24
1809 -7:00 - MST 1949 Jan 14
1810 -8:00 - PST 1970
1811 -7:00 Mexico M%sT 1999
1812 -7:00 - MST
1813 # Baja California Sur, Nayarit, Sinaloa
1814 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1815 -7:00 - MST 1927 Jun 10 23:00
1816 -6:00 - CST 1930 Nov 15
1817 -7:00 - MST 1931 May 1 23:00
1818 -6:00 - CST 1931 Oct
1819 -7:00 - MST 1932 Apr 1
1820 -6:00 - CST 1942 Apr 24
1821 -7:00 - MST 1949 Jan 14
1822 -8:00 - PST 1970
1823 -7:00 Mexico M%sT
1824 # Baja California
1825 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1826 -7:00 - MST 1924
1827 -8:00 - PST 1927 Jun 10 23:00
1828 -7:00 - MST 1930 Nov 15
1829 -8:00 - PST 1931 Apr 1
1830 -8:00 1:00 PDT 1931 Sep 30
1831 -8:00 - PST 1942 Apr 24
1832 -8:00 1:00 PWT 1945 Nov 12
1833 -8:00 - PST 1948 Apr 5
1834 -8:00 1:00 PDT 1949 Jan 14
1835 -8:00 - PST 1954
1836 -8:00 CA P%sT 1961
1837 -8:00 - PST 1976
1838 -8:00 US P%sT 1996
1839 -8:00 Mexico P%sT 2001
1840 -8:00 US P%sT 2002 Feb 20
1841 -8:00 Mexico P%sT
1842 # From Paul Eggert (2001-03-05):
1843 # Formerly there was an America/Ensenada zone, which differed from
1844 # America/Tijuana only in that it did not observe DST from 1976
1845 # through 1995. This was as per Shanks. However, Guy Harris reports
1846 # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
1847 # Tijuana observe DST," which contradicts Shanks but does imply that
1848 # DST-observance was a town-by-town matter back then. This concerns
1849 # data after 1970 so most likely there should be at least one Zone
1850 # other than America/Tijuana for Baja, but it's not clear yet what its
1851 # name or contents should be.
1852 #
1853 # Revillagigedo Is
1854 # no information
1856 ###############################################################################
1858 # Anguilla
1859 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1860 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1861 -4:00 - AST
1863 # Antigua and Barbuda
1864 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1865 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1866 -5:00 - EST 1951
1867 -4:00 - AST
1869 # Bahamas
1870 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1871 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1872 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1873 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1874 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1875 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1876 -5:00 Bahamas E%sT
1878 # Barbados
1879 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1880 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1881 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1882 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1883 Rule Barb 1979 only - Sep 30 2:00 0 S
1884 Rule Barb 1980 only - Sep 25 2:00 0 S
1885 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1886 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1887 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1888 -4:00 Barb A%sT
1890 # Belize
1891 # Whitman entirely disagrees with Shanks; go with Shanks.
1892 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1893 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1894 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1895 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1896 Rule Belize 1974 only - Feb 9 0:00 0 S
1897 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1898 Rule Belize 1983 only - Feb 12 0:00 0 S
1899 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1900 Zone America/Belize -5:52:48 - LMT 1912 Apr
1901 -6:00 Belize C%sT
1903 # Bermuda
1904 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1905 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1906 -4:00 - AST 1974 Apr 28 2:00
1907 -4:00 Bahamas A%sT
1909 # Cayman Is
1910 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1911 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1912 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1913 -5:00 - EST
1915 # Costa Rica
1916 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1917 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1918 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1919 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1920 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1921 Rule CR 1991 only - Jul 1 0:00 0 S
1922 Rule CR 1992 only - Mar 15 0:00 0 S
1923 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1924 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1925 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1926 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1927 -6:00 CR C%sT
1928 # Coco
1929 # no information; probably like America/Costa_Rica
1931 # Cuba
1933 # From Arthur David Olson (1999-03-29):
1934 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1935 # the Cuban National Team and the Baltimore Orioles was carried live on
1936 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1937 # During the game, play-by-play announcer Jim Hunter noted that
1938 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1939 # Time today." (The "two hour" remark referred to losing one hour of
1940 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
1941 # to DST--and one more hour on 1999-04-04--when the announcers will have
1942 # returned to Baltimore, which switches on that date.)
1944 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
1945 # Cuba is not going back to standard time this year.
1946 # From Paul Eggert (2004-10-28):
1947 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
1948 # says that it's due to a problem at the Antonio Guiteras
1949 # thermoelectric plant, and says "This October there will be no return
1950 # to normal hours (after daylight saving time)".
1951 # For now, let's assume that it's a one-year temporary measure.
1953 # From Carlos A. Carnero Delgado (2005-11-12):
1954 # This year (just like in 2004-2005) there's no change in time zone
1955 # adjustment in Cuba. We will stay in daylight saving time:
1956 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
1958 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1959 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1960 Rule Cuba 1928 only - Oct 10 0:00 0 S
1961 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1962 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1963 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1964 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1965 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1966 Rule Cuba 1965 only - Sep 30 0:00 0 S
1967 Rule Cuba 1966 only - May 29 0:00 1:00 D
1968 Rule Cuba 1966 only - Oct 2 0:00 0 S
1969 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1970 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1971 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1972 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1973 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1974 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1975 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1976 Rule Cuba 1978 only - May 7 0:00 1:00 D
1977 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1978 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1979 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1980 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1981 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1982 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1983 Rule Cuba 1996 only - Oct 6 0:00s 0 S
1984 Rule Cuba 1997 only - Oct 12 0:00s 0 S
1985 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1986 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
1987 Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1988 Rule Cuba 2006 max - Oct lastSun 0:00s 0 S
1990 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1991 Zone America/Havana -5:29:28 - LMT 1890
1992 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1993 -5:00 Cuba C%sT
1995 # Dominica
1996 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1997 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1998 -4:00 - AST
2000 # Dominican Republic
2002 # From Steffen Thorsen (2000-10-30):
2003 # Enrique Morales reported to me that the Dominican Republic has changed the
2004 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2005 # http://www.listin.com.do/antes/261000/republica/princi.html
2007 # From Paul Eggert (2000-12-04):
2008 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2010 # From Rives McDow (2000-12-01):
2011 # Dominican Republic changed its mind and presidential decree on Tuesday,
2012 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2013 # Dominican Republic will be reverting to 8 hours from the International Date
2014 # Line, and will not be using DST in the foreseeable future. The reason they
2015 # decided to use DST was to be in synch with Puerto Rico, who was also going
2016 # to implement DST. When Puerto Rico didn't implement DST, the president
2017 # decided to revert.
2020 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2021 Rule DR 1966 only - Oct 30 0:00 1:00 D
2022 Rule DR 1967 only - Feb 28 0:00 0 S
2023 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2024 Rule DR 1970 only - Feb 21 0:00 0 S
2025 Rule DR 1971 only - Jan 20 0:00 0 S
2026 Rule DR 1972 1974 - Jan 21 0:00 0 S
2027 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2028 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2029 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2030 -5:00 DR E%sT 1974 Oct 27
2031 -4:00 - AST 2000 Oct 29 02:00
2032 -5:00 US E%sT 2000 Dec 3 01:00
2033 -4:00 - AST
2035 # El Salvador
2036 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2037 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2038 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2039 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2040 # instead of America/San_Salvador.
2041 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2042 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2043 -6:00 Salv C%sT
2045 # Grenada
2046 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2047 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2048 -4:00 - AST
2050 # Guadeloupe
2051 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2052 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2053 -4:00 - AST
2055 # Guatemala
2056 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2057 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2058 Rule Guat 1974 only - Feb 24 0:00 0 S
2059 Rule Guat 1983 only - May 21 0:00 1:00 D
2060 Rule Guat 1983 only - Sep 22 0:00 0 S
2061 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2062 Rule Guat 1991 only - Sep 7 0:00 0 S
2063 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2064 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2065 -6:00 Guat C%sT
2067 # Haiti
2068 # From Gwillim Law (2005-04-15):
2069 # Risto O. Nykanen wrote me that Haiti is now on DST.
2070 # I searched for confirmation, and I found a
2071 # <a href="http://www.haitianconsulate.org/time.doc"> press release
2072 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2073 # </a>. Translated from French, it says:
2074 #
2075 # "The Prime Minister's Communication Office notifies the public in general
2076 # and the press in particular that, following a decision of the Interior
2077 # Ministry and the Territorial Collectivities [I suppose that means the
2078 # provinces], Haiti will move to Eastern Daylight Time in the night from next
2079 # Saturday the 2nd to Sunday the 3rd.
2080 #
2081 # "Consequently, the Prime Minister's Communication Office wishes to inform
2082 # the population that the country's clocks will be set forward one hour
2083 # starting at midnight. This provision will hold until the last Saturday in
2084 # October 2005.
2085 #
2086 # "Port-au-Prince, March 31, 2005"
2088 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2089 Rule Haiti 1983 only - May 8 0:00 1:00 D
2090 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
2091 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
2092 # Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
2093 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
2094 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
2095 Rule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D
2096 Rule Haiti 2005 only - Oct lastSun 0:00 0 S
2097 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2098 Zone America/Port-au-Prince -4:49:20 - LMT 1890
2099 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
2100 -5:00 Haiti E%sT
2102 # Honduras
2103 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
2104 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2105 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
2106 -6:00 Salv C%sT
2107 #
2108 # Great Swan I ceded by US to Honduras in 1972
2110 # Jamaica
2112 # From Bob Devine (1988-01-28):
2113 # Follows US rules.
2115 # From U. S. Naval Observatory (1989-01-19):
2116 # JAMAICA 5 H BEHIND UTC
2118 # From Shanks:
2119 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2120 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
2121 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2122 -5:00 - EST 1974 Apr 28 2:00
2123 -5:00 US E%sT 1984
2124 -5:00 - EST
2126 # Martinique
2127 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2128 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
2129 -4:04:20 - FFMT 1911 May # Fort-de-France MT
2130 -4:00 - AST 1980 Apr 6
2131 -4:00 1:00 ADT 1980 Sep 28
2132 -4:00 - AST
2134 # Montserrat
2135 # From Paul Eggert (1997-08-31):
2136 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
2137 # Luckily, Olveston, the current de facto capital, has the same longitude.
2138 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2139 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
2140 -4:00 - AST
2142 # Nicaragua
2143 #
2144 # From Steffen Thorsen (1998-12-29):
2145 # Nicaragua seems to be back at -6:00 but I have not been able to find when
2146 # they changed from -5:00.
2147 #
2148 # From Steffen Thorsen (2005-04-12):
2149 # I've got reports from 8 different people that Nicaragua just started
2150 # DST on Sunday 2005-04-10, in order to save energy because of
2151 # expensive petroleum. The exact end date for DST is not yet
2152 # announced, only "September" but some sites also say "mid-September".
2153 # Some background information is available on the President's official site:
2154 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
2155 # The Decree, no 23-2005 is available here:
2156 # 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
2157 #
2158 # From Paul Eggert (2005-05-01):
2159 # The decree doesn't say anything about daylight saving, but for now let's
2160 # assume that it is daylight saving and that they'll switch back on the
2161 # 3rd Sunday in September.
2162 #
2163 # From Gwillim Law (2005-04-21):
2164 # The Associated Press story on the time change, which can be found at
2165 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
2166 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
2167 # time that a change of clocks was applied to save energy was in the year 2000
2168 # during the Arnoldo Aleman administration."...
2169 # The northamerica file says that Nicaragua has been on UTC-6 continuously
2170 # since December 1998. I wasn't able to find any details of Nicaraguan time
2171 # changes in 2000. Perhaps a note could be added to the northamerica file, to
2172 # the effect that we have indirect evidence that DST was observed in 2000.
2173 #
2174 # From Jesper Norgaard Welen (2005-11-02):
2175 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
2176 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
2177 # (2005-09-26)
2178 #
2179 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2180 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
2181 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
2182 Rule Nic 1992 only - Jan 1 4:00 1:00 D
2183 Rule Nic 1992 only - Sep 24 0:00 0 S
2184 Rule Nic 2005 only - Apr 10 0:00 1:00 D
2185 Rule Nic 2005 only - Oct 2 0:00 0 S
2186 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2187 Zone America/Managua -5:45:08 - LMT 1890
2188 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
2189 -6:00 - CST 1973 May
2190 -5:00 - EST 1975 Feb 16
2191 -6:00 Nic C%sT 1993 Jan 1 4:00
2192 -5:00 - EST 1998 Dec
2193 -6:00 Nic C%sT
2195 # Panama
2196 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2197 Zone America/Panama -5:18:08 - LMT 1890
2198 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
2199 -5:00 - EST
2201 # Puerto Rico
2202 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
2203 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2204 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
2205 -4:00 - AST 1942 May 3
2206 -4:00 1:00 AWT 1945 Sep 30 2:00
2207 -4:00 - AST
2209 # St Kitts-Nevis
2210 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2211 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
2212 -4:00 - AST
2214 # St Lucia
2215 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2216 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
2217 -4:04:00 - CMT 1912 # Castries Mean Time
2218 -4:00 - AST
2220 # St Pierre and Miquelon
2221 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
2222 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2223 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
2224 -4:00 - AST 1980 May
2225 -3:00 - PMST 1987 # Pierre & Miquelon Time
2226 -3:00 Canada PM%sT
2228 # St Vincent and the Grenadines
2229 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2230 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
2231 -4:04:56 - KMT 1912 # Kingstown Mean Time
2232 -4:00 - AST
2234 # Turks and Caicos
2235 # From Paul Eggert (1998-08-06):
2236 # Shanks says they use US DST rules, but IATA SSIM (1991/1998)
2237 # says they switch at midnight. Go with IATA SSIM.
2238 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2239 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
2240 Rule TC 1979 max - Oct lastSun 0:00 0 S
2241 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
2242 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2243 Zone America/Grand_Turk -4:44:32 - LMT 1890
2244 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2245 -5:00 TC E%sT
2247 # British Virgin Is
2248 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2249 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
2250 -4:00 - AST
2252 # Virgin Is
2253 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2254 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
2255 -4:00 - AST