184 # From Arthur David Olson, 2005-12-19
185 # We generate the files specified below to guard against old files with
186 # obsolete information being left in the time zone binary directory.
187 # We limit the list to names that have appeared in previous versions of
188 # this time zone package.
189 # We do these as separate Zones rather than as Links to avoid problems if
190 # a particular place changes whether it observes DST.
191 # We put these specifications here in the northamerica file both to
192 # increase the chances that they'll actually get compiled and to
193 # avoid the need to duplicate the US rules in another file.
194
195 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
196 Zone EST -5:00 - EST
197 Zone MST -7:00 - MST
198 Zone HST -10:00 - HST
199 Zone EST5EDT -5:00 US E%sT
200 Zone CST6CDT -6:00 US C%sT
201 Zone MST7MDT -7:00 US M%sT
202 Zone PST8PDT -8:00 US P%sT
203
204 # From Bob Devine (1988-01-28):
205 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
206 # old new
207 # Pacific Standard Time(PST) -same-
208 # Yukon Standard Time(YST) -same-
209 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
210 # Nome Standard Time (NT) Bering Standard Time (BST)
211 #
212 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
213 # The YST zone now covers nearly all of the state, AHST just part
214 # of the Aleutian islands. No DST.
215
216 # From Paul Eggert (1995-12-19):
217 # The tables below use 'NST', not 'NT', for Nome Standard Time.
218 # I invented 'CAWT' for Central Alaska War Time.
219
220 # From U. S. Naval Observatory (1989-01-19):
221 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
222 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
223 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
224 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
225 # USA MOUNTAIN 7 H BEHIND UTC DENVER
226 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
227 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
228 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
229 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
230 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
231 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
232 # USA " 9 H BEHIND UTC APR 3 - OCT 30
233 # USA HAWAII 10 H BEHIND UTC
234 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
235
236 # From Arthur David Olson (1989-01-21):
237 # The above dates are for 1988.
238 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
239 # no DST in Samoa, and the claim that there is DST in Alaska and the
256 # public law 98-181):
257 # Atlantic standard time
258 # eastern standard time
259 # central standard time
260 # mountain standard time
261 # Pacific standard time
262 # Yukon standard time
263 # Alaska-Hawaii standard time
264 # Bering standard time
265 # And after 1983-11-30:
266 # Atlantic standard time
267 # eastern standard time
268 # central standard time
269 # mountain standard time
270 # Pacific standard time
271 # Alaska standard time
272 # Hawaii-Aleutian standard time
273 # Samoa standard time
274 # The law doesn't give abbreviations.
275 #
276 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
277 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
278 # for time in Guam and the Northern Marianas. See the file "australasia".
279 #
280 # From Paul Eggert (2015-04-17):
281 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
282 # standard and daylight times. See section 9.47 (p 234) of the
283 # U.S. Government Printing Office Style Manual (2008)
284 # http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
285
286 # From Arthur David Olson, 2005-08-09
287 # The following was signed into law on 2005-08-08.
288 #
289 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
290 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
291 # U.S.C. 260a(a)) is amended--
292 # (1) by striking "first Sunday of April" and inserting "second
293 # Sunday of March"; and
294 # (2) by striking "last Sunday of October" and inserting "first
295 # Sunday of November'.
311 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
312 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
313 # Vermont, Virginia, West Virginia
314
315 # From Dave Cantor (2004-11-02):
316 # Early this summer I had the occasion to visit the Mount Washington
317 # Observatory weather station atop (of course!) Mount Washington [, NH]....
318 # One of the staff members said that the station was on Eastern Standard Time
319 # and didn't change their clocks for Daylight Saving ... so that their
320 # reports will always have times which are 5 hours behind UTC.
321
322 # From Paul Eggert (2005-08-26):
323 # According to today's Huntsville Times
324 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
325 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
326 # in Russell County, Lanett in Chambers County and some towns in Lee County,
327 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
328 # Roberts, city administrator in Phenix City. as saying "We are in the Central
329 # time zone, but we do go by the Eastern time zone because so many people work
330 # in Columbus."
331
332 # From Paul Eggert (2014-09-06):
333 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
334 # says that New York City Hall time was 3 minutes 58.4 seconds fast of
335 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the
336 # nearest second.
337
338 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
339 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
340 Rule NYC 1920 only - Oct lastSun 2:00 0 S
341 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
342 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
343 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
344 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
345 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
346 -5:00 US E%sT 1920
347 -5:00 NYC E%sT 1942
348 -5:00 US E%sT 1946
349 -5:00 NYC E%sT 1967
350 -5:00 US E%sT
488 # Despite the controversy, in 1949 California voters approved Proposition 12,
489 # which established DST from April's last Sunday at 01:00 until September's
490 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
491 # the fall-back date to October's last Sunday. See:
492 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
493 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
494 #
495 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
496 Rule CA 1948 only - Mar 14 2:01 1:00 D
497 Rule CA 1949 only - Jan 1 2:00 0 S
498 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
499 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
500 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
501 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
502 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
503 -8:00 US P%sT 1946
504 -8:00 CA P%sT 1967
505 -8:00 US P%sT
506
507 # Alaska
508 # AK%sT is the modern abbreviation for -9:00 per USNO.
509 #
510 # From Paul Eggert (2001-05-30):
511 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
512 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
513 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
514 # also a Friday. Include only the time zone part of this transition,
515 # ignoring the switch from Julian to Gregorian, since we can't represent
516 # the Julian calendar.
517 #
518 # As far as we know, none of the exact locations mentioned below were
519 # permanently inhabited in 1867 by anyone using either calendar.
520 # (Yakutat was colonized by the Russians in 1799, but the settlement
521 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
522 # were nearby inhabitants in some cases and for our purposes perhaps
523 # it's best to simply use the official transition.
524
525 # From Paul Eggert (2014-07-18):
526 # One opinion of the early-1980s turmoil in Alaska over time zones and
527 # daylight saving time appeared as graffiti on a Juneau airport wall:
528 # "Welcome to Juneau. Please turn your watch back to the 19th century."
594 -8:00 US P%sT 1983 Oct 30 2:00
595 -9:00 US Y%sT 1983 Nov 30
596 -9:00 US AK%sT
597 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
598 -8:46:18 - LMT 1900 Aug 20 12:00
599 -8:00 - PST 1942
600 -8:00 US P%sT 1946
601 -8:00 - PST 1969
602 -8:00 US P%sT 1983 Oct 30 2:00
603 -8:00 - PST 2015 Nov 1 2:00
604 -9:00 US AK%sT
605 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
606 -9:18:55 - LMT 1900 Aug 20 12:00
607 -9:00 - YST 1942
608 -9:00 US Y%sT 1946
609 -9:00 - YST 1969
610 -9:00 US Y%sT 1983 Nov 30
611 -9:00 US AK%sT
612 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
613 -9:59:36 - LMT 1900 Aug 20 12:00
614 -10:00 - CAT 1942
615 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
616 -10:00 US CAT/CAPT 1946 # Peace
617 -10:00 - CAT 1967 Apr
618 -10:00 - AHST 1969
619 -10:00 US AH%sT 1983 Oct 30 2:00
620 -9:00 US Y%sT 1983 Nov 30
621 -9:00 US AK%sT
622 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
623 -11:01:38 - LMT 1900 Aug 20 12:00
624 -11:00 - NST 1942
625 -11:00 US N%sT 1946
626 -11:00 - NST 1967 Apr
627 -11:00 - BST 1969
628 -11:00 US B%sT 1983 Oct 30 2:00
629 -9:00 US Y%sT 1983 Nov 30
630 -9:00 US AK%sT
631 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
632 -11:46:38 - LMT 1900 Aug 20 12:00
633 -11:00 - NST 1942
634 -11:00 US N%sT 1946
635 -11:00 - NST 1967 Apr
636 -11:00 - BST 1969
637 -11:00 US B%sT 1983 Oct 30 2:00
686 # hour...This Act shall take effect upon its approval. Approved this 26th
687 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
688 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
689 # hereby repealed...This Act shall take effect upon its approval, upon
690 # which date the standard time of this Territory shall be restored to
691 # that existing immediately prior to the taking effect of said Act 90.
692 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
693 # of the Territory of Hawaii."
694 #
695 # Note that 1933-05-21 was a Sunday.
696 # We're left to guess the time of day when Act 163 was approved; guess noon.
697
698 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
699 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
700 -10:30 - HST 1933 Apr 30 2:00
701 -10:30 1:00 HDT 1933 May 21 12:00
702 -10:30 - HST 1942 Feb 9 2:00
703 -10:30 1:00 HDT 1945 Sep 30 2:00
704 -10:30 - HST 1947 Jun 8 2:00
705 -10:00 - HST
706 Link Pacific/Honolulu Pacific/Johnston
707
708 # Now we turn to US areas that have diverged from the consensus since 1970.
709
710 # Arizona mostly uses MST.
711
712 # From Paul Eggert (2002-10-20):
713 #
714 # The information in the rest of this paragraph is derived from the
715 # Daylight Saving Time web page
716 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
717 # maintained by the Arizona State Library, Archives and Public Records.
718 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
719 # time, but by federal law railroads, airlines, bus lines, military
720 # personnel, and some engaged in interstate commerce continued to
721 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
722 # Gazette says that was the date the law changed, and that 04-01 was
723 # the date the state's clocks would change. In 1945 the State of
724 # Arizona used standard time all year, again with exceptions only as
725 # mandated by federal law. Arizona observed DST in 1967, but Arizona
726 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
1074 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1075 -6:00 US C%sT 1946
1076 -6:00 Menominee C%sT 1969 Apr 27 2:00
1077 -5:00 - EST 1973 Apr 29 2:00
1078 -6:00 US C%sT
1079
1080 # Navassa
1081 # administered by the US Fish and Wildlife Service
1082 # claimed by US under the provisions of the 1856 Guano Islands Act
1083 # also claimed by Haiti
1084 # occupied 1857/1900 by the Navassa Phosphate Co
1085 # US lighthouse 1917/1996-09
1086 # currently uninhabited
1087 # see Mark Fineman, "An Isle Rich in Guano and Discord",
1088 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1089 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1090
1091 ################################################################################
1092
1093
1094 # From Paul Eggert (2014-10-31):
1095 #
1096 # Unless otherwise specified, the source for data through 1990 is:
1097 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1098 # San Diego: ACS Publications, Inc. (2003).
1099 # Unfortunately this book contains many errors and cites no sources.
1100 #
1101 # Gwillim Law writes that a good source
1102 # for recent time zone data is the International Air Transport
1103 # Association's Standard Schedules Information Manual (IATA SSIM),
1104 # published semiannually. Law sent in several helpful summaries
1105 # of the IATA's data after 1990. Except where otherwise noted,
1106 # IATA SSIM is the source for entries after 1990.
1107 #
1108 # Other sources occasionally used include:
1109 #
1110 # Edward W. Whitman, World Time Differences,
1111 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1112 # which I found in the UCLA library.
1113 #
1114 # William Willett, The Waste of Daylight, 19th edition
1115 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1116 # [PDF] (1914-03)
1117 #
1118 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1119 # <http://www.jstor.org/stable/1774359>.
1120 #
1121 # See the 'europe' file for Greenland.
1122
2740 -5:00 US E%sT
2741
2742 # Barbados
2743
2744 # For 1899 Milne gives -3:58:29.2; round that.
2745
2746 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2747 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2748 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2749 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2750 Rule Barb 1979 only - Sep 30 2:00 0 S
2751 Rule Barb 1980 only - Sep 25 2:00 0 S
2752 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2753 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2754 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2755 -4:00 Barb A%sT
2756
2757 # Belize
2758 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2759 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2760 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2761 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2762 Rule Belize 1973 only - Dec 5 0:00 1:00 D
2763 Rule Belize 1974 only - Feb 9 0:00 0 S
2764 Rule Belize 1982 only - Dec 18 0:00 1:00 D
2765 Rule Belize 1983 only - Feb 12 0:00 0 S
2766 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2767 Zone America/Belize -5:52:48 - LMT 1912 Apr
2768 -6:00 Belize C%sT
2769
2770 # Bermuda
2771
2772 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2773 # Bermuda dockyard, Ireland I; round that.
2774
2775 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2776
2777 # Next year, however, clocks in the US will go forward on the second Sunday
2778 # in March, until the first Sunday in November. And, after the Time Zone
2779 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2780 # Friday, the same thing will happen in Bermuda.
2781 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2782
2783 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2784 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2785 -4:00 - AST 1974 Apr 28 2:00
2786 -4:00 Canada A%sT 1976
2787 -4:00 US A%sT
2788
3020
3021 # From Steffen Thorsen (2000-10-30):
3022 # Enrique Morales reported to me that the Dominican Republic has changed the
3023 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
3024 # http://www.listin.com.do/antes/261000/republica/princi.html
3025
3026 # From Paul Eggert (2000-12-04):
3027 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
3028
3029 # From Rives McDow (2000-12-01):
3030 # Dominican Republic changed its mind and presidential decree on Tuesday,
3031 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
3032 # Dominican Republic will be reverting to 8 hours from the International Date
3033 # Line, and will not be using DST in the foreseeable future. The reason they
3034 # decided to use DST was to be in synch with Puerto Rico, who was also going
3035 # to implement DST. When Puerto Rico didn't implement DST, the president
3036 # decided to revert.
3037
3038
3039 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3040 Rule DR 1966 only - Oct 30 0:00 1:00 D
3041 Rule DR 1967 only - Feb 28 0:00 0 S
3042 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
3043 Rule DR 1970 only - Feb 21 0:00 0 S
3044 Rule DR 1971 only - Jan 20 0:00 0 S
3045 Rule DR 1972 1974 - Jan 21 0:00 0 S
3046 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3047 Zone America/Santo_Domingo -4:39:36 - LMT 1890
3048 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
3049 -5:00 DR E%sT 1974 Oct 27
3050 -4:00 - AST 2000 Oct 29 2:00
3051 -5:00 US E%sT 2000 Dec 3 1:00
3052 -4:00 - AST
3053
3054 # El Salvador
3055
3056 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3057 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
3058 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
3059 # There are too many San Salvadors elsewhere, so use America/El_Salvador
3060 # instead of America/San_Salvador.
3061 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3062 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
3063 -6:00 Salv C%sT
3064
3065 # Grenada
3066 # Guadeloupe
3067 # St Barthélemy
3068 # St Martin (French part)
3069 # See America/Port_of_Spain.
3319 -5:00 - EST
3320 Link America/Panama America/Cayman
3321
3322 # Puerto Rico
3323 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3324 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3325 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3326 -4:00 - AST 1942 May 3
3327 -4:00 US A%sT 1946
3328 -4:00 - AST
3329
3330 # St Kitts-Nevis
3331 # St Lucia
3332 # See America/Port_of_Spain.
3333
3334 # St Pierre and Miquelon
3335 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3336 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3337 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3338 -4:00 - AST 1980 May
3339 -3:00 - PMST 1987 # Pierre & Miquelon Time
3340 -3:00 Canada PM%sT
3341
3342 # St Vincent and the Grenadines
3343 # See America/Port_of_Spain.
3344
3345 # Turks and Caicos
3346 #
3347 # From Chris Dunn in
3348 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3349 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3350 # daylight saving dates for time changes have been adjusted to match
3351 # the recent U.S. change of dates.
3352 #
3353 # From Brian Inglis (2007-04-28):
3354 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3355 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3356 # rows before that there is an out of date entry for Oct:
3357 # "Eastern Standard Times Begins 2007
3358 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3359 # indicating that the normal ET rules are followed.
3360 #
|
184 # From Arthur David Olson, 2005-12-19
185 # We generate the files specified below to guard against old files with
186 # obsolete information being left in the time zone binary directory.
187 # We limit the list to names that have appeared in previous versions of
188 # this time zone package.
189 # We do these as separate Zones rather than as Links to avoid problems if
190 # a particular place changes whether it observes DST.
191 # We put these specifications here in the northamerica file both to
192 # increase the chances that they'll actually get compiled and to
193 # avoid the need to duplicate the US rules in another file.
194
195 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
196 Zone EST -5:00 - EST
197 Zone MST -7:00 - MST
198 Zone HST -10:00 - HST
199 Zone EST5EDT -5:00 US E%sT
200 Zone CST6CDT -6:00 US C%sT
201 Zone MST7MDT -7:00 US M%sT
202 Zone PST8PDT -8:00 US P%sT
203
204 # From U. S. Naval Observatory (1989-01-19):
205 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
206 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
207 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
208 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
209 # USA MOUNTAIN 7 H BEHIND UTC DENVER
210 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
211 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
212 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
213 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
214 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
215 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
216 # USA " 9 H BEHIND UTC APR 3 - OCT 30
217 # USA HAWAII 10 H BEHIND UTC
218 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
219
220 # From Arthur David Olson (1989-01-21):
221 # The above dates are for 1988.
222 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
223 # no DST in Samoa, and the claim that there is DST in Alaska and the
240 # public law 98-181):
241 # Atlantic standard time
242 # eastern standard time
243 # central standard time
244 # mountain standard time
245 # Pacific standard time
246 # Yukon standard time
247 # Alaska-Hawaii standard time
248 # Bering standard time
249 # And after 1983-11-30:
250 # Atlantic standard time
251 # eastern standard time
252 # central standard time
253 # mountain standard time
254 # Pacific standard time
255 # Alaska standard time
256 # Hawaii-Aleutian standard time
257 # Samoa standard time
258 # The law doesn't give abbreviations.
259 #
260 # From Paul Eggert (2016-12-19):
261 # Here are URLs for the 1918 and 1966 legislation:
262 # http://uscode.house.gov/statviewer.htm?volume=40&page=451
263 # http://uscode.house.gov/statviewer.htm?volume=80&page=108
264 # Although the 1918 names were officially "United States Standard
265 # Eastern Time" and similarly for "Central", "Mountain", "Pacific",
266 # and "Alaska", in practice "Standard" was placed just before "Time",
267 # as codified in 1966. In practice, Alaska time was abbreviated "AST"
268 # before 1968. Summarizing the 1967 name changes:
269 # 1918 names 1967 names
270 # -08 Standard Pacific Time (PST) Pacific standard time (PST)
271 # -09 (unofficial) Yukon (YST) Yukon standard time (YST)
272 # -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST)
273 # -11 (unofficial) Nome (NST) Bering standard time (BST)
274 #
275 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
276 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
277 # for time in Guam and the Northern Marianas. See the file "australasia".
278 #
279 # From Paul Eggert (2015-04-17):
280 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
281 # standard and daylight times. See section 9.47 (p 234) of the
282 # U.S. Government Printing Office Style Manual (2008)
283 # http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
284
285 # From Arthur David Olson, 2005-08-09
286 # The following was signed into law on 2005-08-08.
287 #
288 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
289 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
290 # U.S.C. 260a(a)) is amended--
291 # (1) by striking "first Sunday of April" and inserting "second
292 # Sunday of March"; and
293 # (2) by striking "last Sunday of October" and inserting "first
294 # Sunday of November'.
310 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
311 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
312 # Vermont, Virginia, West Virginia
313
314 # From Dave Cantor (2004-11-02):
315 # Early this summer I had the occasion to visit the Mount Washington
316 # Observatory weather station atop (of course!) Mount Washington [, NH]....
317 # One of the staff members said that the station was on Eastern Standard Time
318 # and didn't change their clocks for Daylight Saving ... so that their
319 # reports will always have times which are 5 hours behind UTC.
320
321 # From Paul Eggert (2005-08-26):
322 # According to today's Huntsville Times
323 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
324 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
325 # in Russell County, Lanett in Chambers County and some towns in Lee County,
326 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
327 # Roberts, city administrator in Phenix City. as saying "We are in the Central
328 # time zone, but we do go by the Eastern time zone because so many people work
329 # in Columbus."
330 #
331 # From Paul Eggert (2017-02-22):
332 # Four cities are involved. The two not mentioned above are Smiths Station
333 # and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started
334 # because West Point Pepperell textile mills were in Alabama while the
335 # corporate office was in Georgia, and residents voted to keep Eastern
336 # time even after the mills closed. See: Kazek K. Did you know which
337 # Alabama towns are in a different time zone? al.com 2017-02-06.
338 # http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html
339
340 # From Paul Eggert (2014-09-06):
341 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
342 # says that New York City Hall time was 3 minutes 58.4 seconds fast of
343 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the
344 # nearest second.
345
346 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
347 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
348 Rule NYC 1920 only - Oct lastSun 2:00 0 S
349 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
350 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
351 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
352 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
353 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
354 -5:00 US E%sT 1920
355 -5:00 NYC E%sT 1942
356 -5:00 US E%sT 1946
357 -5:00 NYC E%sT 1967
358 -5:00 US E%sT
496 # Despite the controversy, in 1949 California voters approved Proposition 12,
497 # which established DST from April's last Sunday at 01:00 until September's
498 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
499 # the fall-back date to October's last Sunday. See:
500 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
501 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
502 #
503 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
504 Rule CA 1948 only - Mar 14 2:01 1:00 D
505 Rule CA 1949 only - Jan 1 2:00 0 S
506 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
507 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
508 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
509 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
510 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
511 -8:00 US P%sT 1946
512 -8:00 CA P%sT 1967
513 -8:00 US P%sT
514
515 # Alaska
516 # AK%sT is the modern abbreviation for -09 per USNO.
517 #
518 # From Paul Eggert (2001-05-30):
519 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
520 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
521 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
522 # also a Friday. Include only the time zone part of this transition,
523 # ignoring the switch from Julian to Gregorian, since we can't represent
524 # the Julian calendar.
525 #
526 # As far as we know, none of the exact locations mentioned below were
527 # permanently inhabited in 1867 by anyone using either calendar.
528 # (Yakutat was colonized by the Russians in 1799, but the settlement
529 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
530 # were nearby inhabitants in some cases and for our purposes perhaps
531 # it's best to simply use the official transition.
532
533 # From Paul Eggert (2014-07-18):
534 # One opinion of the early-1980s turmoil in Alaska over time zones and
535 # daylight saving time appeared as graffiti on a Juneau airport wall:
536 # "Welcome to Juneau. Please turn your watch back to the 19th century."
602 -8:00 US P%sT 1983 Oct 30 2:00
603 -9:00 US Y%sT 1983 Nov 30
604 -9:00 US AK%sT
605 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
606 -8:46:18 - LMT 1900 Aug 20 12:00
607 -8:00 - PST 1942
608 -8:00 US P%sT 1946
609 -8:00 - PST 1969
610 -8:00 US P%sT 1983 Oct 30 2:00
611 -8:00 - PST 2015 Nov 1 2:00
612 -9:00 US AK%sT
613 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
614 -9:18:55 - LMT 1900 Aug 20 12:00
615 -9:00 - YST 1942
616 -9:00 US Y%sT 1946
617 -9:00 - YST 1969
618 -9:00 US Y%sT 1983 Nov 30
619 -9:00 US AK%sT
620 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
621 -9:59:36 - LMT 1900 Aug 20 12:00
622 -10:00 - AST 1942
623 -10:00 US A%sT 1967 Apr
624 -10:00 - AHST 1969
625 -10:00 US AH%sT 1983 Oct 30 2:00
626 -9:00 US Y%sT 1983 Nov 30
627 -9:00 US AK%sT
628 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
629 -11:01:38 - LMT 1900 Aug 20 12:00
630 -11:00 - NST 1942
631 -11:00 US N%sT 1946
632 -11:00 - NST 1967 Apr
633 -11:00 - BST 1969
634 -11:00 US B%sT 1983 Oct 30 2:00
635 -9:00 US Y%sT 1983 Nov 30
636 -9:00 US AK%sT
637 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
638 -11:46:38 - LMT 1900 Aug 20 12:00
639 -11:00 - NST 1942
640 -11:00 US N%sT 1946
641 -11:00 - NST 1967 Apr
642 -11:00 - BST 1969
643 -11:00 US B%sT 1983 Oct 30 2:00
692 # hour...This Act shall take effect upon its approval. Approved this 26th
693 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
694 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
695 # hereby repealed...This Act shall take effect upon its approval, upon
696 # which date the standard time of this Territory shall be restored to
697 # that existing immediately prior to the taking effect of said Act 90.
698 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
699 # of the Territory of Hawaii."
700 #
701 # Note that 1933-05-21 was a Sunday.
702 # We're left to guess the time of day when Act 163 was approved; guess noon.
703
704 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
705 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
706 -10:30 - HST 1933 Apr 30 2:00
707 -10:30 1:00 HDT 1933 May 21 12:00
708 -10:30 - HST 1942 Feb 9 2:00
709 -10:30 1:00 HDT 1945 Sep 30 2:00
710 -10:30 - HST 1947 Jun 8 2:00
711 -10:00 - HST
712
713 # Now we turn to US areas that have diverged from the consensus since 1970.
714
715 # Arizona mostly uses MST.
716
717 # From Paul Eggert (2002-10-20):
718 #
719 # The information in the rest of this paragraph is derived from the
720 # Daylight Saving Time web page
721 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
722 # maintained by the Arizona State Library, Archives and Public Records.
723 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
724 # time, but by federal law railroads, airlines, bus lines, military
725 # personnel, and some engaged in interstate commerce continued to
726 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
727 # Gazette says that was the date the law changed, and that 04-01 was
728 # the date the state's clocks would change. In 1945 the State of
729 # Arizona used standard time all year, again with exceptions only as
730 # mandated by federal law. Arizona observed DST in 1967, but Arizona
731 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
1079 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1080 -6:00 US C%sT 1946
1081 -6:00 Menominee C%sT 1969 Apr 27 2:00
1082 -5:00 - EST 1973 Apr 29 2:00
1083 -6:00 US C%sT
1084
1085 # Navassa
1086 # administered by the US Fish and Wildlife Service
1087 # claimed by US under the provisions of the 1856 Guano Islands Act
1088 # also claimed by Haiti
1089 # occupied 1857/1900 by the Navassa Phosphate Co
1090 # US lighthouse 1917/1996-09
1091 # currently uninhabited
1092 # see Mark Fineman, "An Isle Rich in Guano and Discord",
1093 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1094 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1095
1096 ################################################################################
1097
1098
1099 # From Paul Eggert (2017-02-10):
1100 #
1101 # Unless otherwise specified, the source for data through 1990 is:
1102 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1103 # San Diego: ACS Publications, Inc. (2003).
1104 # Unfortunately this book contains many errors and cites no sources.
1105 #
1106 # Many years ago Gwillim Law wrote that a good source
1107 # for time zone data was the International Air Transport
1108 # Association's Standard Schedules Information Manual (IATA SSIM),
1109 # published semiannually. Law sent in several helpful summaries
1110 # of the IATA's data after 1990. Except where otherwise noted,
1111 # IATA SSIM is the source for entries after 1990.
1112 #
1113 # Other sources occasionally used include:
1114 #
1115 # Edward W. Whitman, World Time Differences,
1116 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1117 # which I found in the UCLA library.
1118 #
1119 # William Willett, The Waste of Daylight, 19th edition
1120 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1121 # [PDF] (1914-03)
1122 #
1123 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1124 # <http://www.jstor.org/stable/1774359>.
1125 #
1126 # See the 'europe' file for Greenland.
1127
2745 -5:00 US E%sT
2746
2747 # Barbados
2748
2749 # For 1899 Milne gives -3:58:29.2; round that.
2750
2751 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2752 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2753 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2754 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2755 Rule Barb 1979 only - Sep 30 2:00 0 S
2756 Rule Barb 1980 only - Sep 25 2:00 0 S
2757 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2758 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2759 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2760 -4:00 Barb A%sT
2761
2762 # Belize
2763 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2764 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2765 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530
2766 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST
2767 Rule Belize 1973 only - Dec 5 0:00 1:00 CDT
2768 Rule Belize 1974 only - Feb 9 0:00 0 CST
2769 Rule Belize 1982 only - Dec 18 0:00 1:00 CDT
2770 Rule Belize 1983 only - Feb 12 0:00 0 CST
2771 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2772 Zone America/Belize -5:52:48 - LMT 1912 Apr
2773 -6:00 Belize %s
2774
2775 # Bermuda
2776
2777 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2778 # Bermuda dockyard, Ireland I; round that.
2779
2780 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2781
2782 # Next year, however, clocks in the US will go forward on the second Sunday
2783 # in March, until the first Sunday in November. And, after the Time Zone
2784 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2785 # Friday, the same thing will happen in Bermuda.
2786 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2787
2788 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2789 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2790 -4:00 - AST 1974 Apr 28 2:00
2791 -4:00 Canada A%sT 1976
2792 -4:00 US A%sT
2793
3025
3026 # From Steffen Thorsen (2000-10-30):
3027 # Enrique Morales reported to me that the Dominican Republic has changed the
3028 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
3029 # http://www.listin.com.do/antes/261000/republica/princi.html
3030
3031 # From Paul Eggert (2000-12-04):
3032 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
3033
3034 # From Rives McDow (2000-12-01):
3035 # Dominican Republic changed its mind and presidential decree on Tuesday,
3036 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
3037 # Dominican Republic will be reverting to 8 hours from the International Date
3038 # Line, and will not be using DST in the foreseeable future. The reason they
3039 # decided to use DST was to be in synch with Puerto Rico, who was also going
3040 # to implement DST. When Puerto Rico didn't implement DST, the president
3041 # decided to revert.
3042
3043
3044 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3045 Rule DR 1966 only - Oct 30 0:00 1:00 EDT
3046 Rule DR 1967 only - Feb 28 0:00 0 EST
3047 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430
3048 Rule DR 1970 only - Feb 21 0:00 0 EST
3049 Rule DR 1971 only - Jan 20 0:00 0 EST
3050 Rule DR 1972 1974 - Jan 21 0:00 0 EST
3051 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3052 Zone America/Santo_Domingo -4:39:36 - LMT 1890
3053 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
3054 -5:00 DR %s 1974 Oct 27
3055 -4:00 - AST 2000 Oct 29 2:00
3056 -5:00 US E%sT 2000 Dec 3 1:00
3057 -4:00 - AST
3058
3059 # El Salvador
3060
3061 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3062 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
3063 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
3064 # There are too many San Salvadors elsewhere, so use America/El_Salvador
3065 # instead of America/San_Salvador.
3066 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3067 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
3068 -6:00 Salv C%sT
3069
3070 # Grenada
3071 # Guadeloupe
3072 # St Barthélemy
3073 # St Martin (French part)
3074 # See America/Port_of_Spain.
3324 -5:00 - EST
3325 Link America/Panama America/Cayman
3326
3327 # Puerto Rico
3328 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3329 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3330 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3331 -4:00 - AST 1942 May 3
3332 -4:00 US A%sT 1946
3333 -4:00 - AST
3334
3335 # St Kitts-Nevis
3336 # St Lucia
3337 # See America/Port_of_Spain.
3338
3339 # St Pierre and Miquelon
3340 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3341 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3342 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3343 -4:00 - AST 1980 May
3344 -3:00 - -03 1987
3345 -3:00 Canada -03/-02
3346
3347 # St Vincent and the Grenadines
3348 # See America/Port_of_Spain.
3349
3350 # Turks and Caicos
3351 #
3352 # From Chris Dunn in
3353 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3354 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3355 # daylight saving dates for time changes have been adjusted to match
3356 # the recent U.S. change of dates.
3357 #
3358 # From Brian Inglis (2007-04-28):
3359 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3360 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3361 # rows before that there is an out of date entry for Oct:
3362 # "Eastern Standard Times Begins 2007
3363 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3364 # indicating that the normal ET rules are followed.
3365 #
|