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locks; strict; comment @# @; 1.11 date 97.06.18.01.28.14; author jtc; state dead; branches; next 1.10; 1.10 date 97.03.18.03.01.39; author mrg; state Exp; branches; next 1.9; 1.9 date 96.12.18.05.22.54; author jtc; state Exp; branches; next 1.8; 1.8 date 96.09.10.22.54.28; author jtc; state Exp; branches; next 1.7; 1.7 date 96.05.13.21.35.36; author jtc; state Exp; branches; next 1.6; 1.6 date 96.03.19.18.50.59; author jtc; state Exp; branches; next 1.5; 1.5 date 96.01.08.22.36.57; author jtc; state Exp; branches; next 1.4; 1.4 date 95.09.28.07.35.57; author jtc; state Exp; branches; next 1.3; 1.3 date 95.03.08.20.51.18; author jtc; state Exp; branches; next 1.2; 1.2 date 93.11.03.09.35.18; author cgd; state Exp; branches; next 1.1; 1.1 date 93.03.21.09.45.37; author cgd; state Exp; branches 1.1.1.1; next ; 1.1.1.1 date 93.03.21.09.45.37; author cgd; state Exp; branches; next 1.1.1.2; 1.1.1.2 date 95.03.08.20.41.52; author jtc; state Exp; branches; next 1.1.1.3; 1.1.1.3 date 95.09.28.07.33.21; author jtc; state Exp; branches; next 1.1.1.4; 1.1.1.4 date 96.01.08.22.34.32; author jtc; state Exp; branches; next 1.1.1.5; 1.1.1.5 date 96.03.19.18.49.10; author jtc; state Exp; branches; next 1.1.1.6; 1.1.1.6 date 96.05.13.21.28.24; author jtc; state Exp; branches; next 1.1.1.7; 1.1.1.7 date 96.09.10.22.52.02; author jtc; state Exp; branches; next 1.1.1.8; 1.1.1.8 date 96.12.18.05.21.07; author jtc; state Exp; branches; next 1.1.1.9; 1.1.1.9 date 97.03.18.01.37.03; author mrg; state Exp; branches; next ; desc @@ 1.11 log @Remove datfiles subdirectory, it's a remanent from long ago. @ text @# @@(#)northamerica 7.30 # also includes Central America and the Caribbean # This data is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz@@elsie.nci.nih.gov for general use in the future). # From Paul Eggert (1994-08-17): # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and the discovery of the longitude, # Oxford University Press (1980). ############################################################################### # United States # From Paul Eggert (1995-12-19): # A good source for time zone historical data in the US is # Thomas G. Shanks, The American Atlas (5th edition), # San Diego: ACS Publications, Inc. (1991). # Make sure you have the errata sheet; the book is somewhat useless without it. # It is the source for the US and Puerto Rico entries below. # From Paul Eggert (1996-06-12): # Daylight Saving Time was first suggested as a joke by Benjamin Franklin # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). # Not everyone is happy with the results: # # I don't really care how time is reckoned so long as there is some # agreement about it, but I object to being told that I am saving # daylight when my reason tells me that I am doing nothing of the kind. # I even object to the implication that I am wasting something # valuable if I stay in bed after the sun has risen. As an admirer # of moonlight I resent the bossy insistence of those who want to # reduce my time for enjoying it. At the back of the Daylight Saving # scheme I detect the bony, blue-fingered hand of Puritanism, eager # to push people into bed earlier, and get them up earlier, to make # them healthy, wealthy and wise in spite of themselves. # # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday # From Arthur David Olson: # US Daylight Saving Time ended on the last Sunday of *October* in 1974. # See, for example, the front page of the Saturday, 1974-10-26 # and Sunday, 1974-10-27 editions of the Washington Post. # From Arthur David Olson: # Before the Uniform Time Act of 1966 took effect in 1967, observance of # Daylight Saving Time in the US was by local option, except during wartime. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War Rule US 1918 1919 - Oct lastSun 2:00 0 S Rule US 1942 only - Feb 9 2:00 1:00 W # War Rule US 1945 only - Sep 30 2:00 0 S Rule US 1967 max - Oct lastSun 2:00 0 S Rule US 1967 1973 - Apr lastSun 2:00 1:00 D Rule US 1974 only - Jan 6 2:00 1:00 D Rule US 1975 only - Feb 23 2:00 1:00 D Rule US 1976 1986 - Apr lastSun 2:00 1:00 D Rule US 1987 max - Apr Sun>=1 2:00 1:00 D # From Bob Devine (1988-01-28): # ...Alaska (and Hawaii) had the timezone names changed in 1967. # old new # Pacific Standard Time(PST) -same- # Yukon Standard Time(YST) -same- # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) # Nome Standard Time (NT) Bering Standard Time (BST) # # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. # The YST zone now covers nearly all of the state, AHST just part # of the Aleutian islands. No DST. # From Paul Eggert (1995-12-19): # The tables below use `NST', not `NT', for Nome Standard Time. # I invented `CAWT' for Central Alaska War Time. # From U. S. Naval Observatory (1989-01-19): # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 # USA MOUNTAIN 7 H BEHIND UTC DENVER # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W # USA - " - 9 H BEHIND UTC APR 3 - OCT 30 # USA HAWAII 10 H BEHIND UTC # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY # From Arthur David Olson (1989-01-21): # The above dates are for 1988. # Note the "AKST" and "AKDT" abbreviations, the claim that there's # no DST in Samoa, and the claim that there is DST in Alaska and the # Aleutians. # From Arthur David Olson (1988-02-13): # Legal standard time zone names, from United States Code (1982 Edition and # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 # took effect), as explained in sections 263 and 261: # (none) # United States standard eastern time # United States standard mountain time # United States standard central time # United States standard Pacific time # (none) # United States standard Alaska time # (none) # Next, names from 1967-04-01 until 1983-11-30 (the date for # public law 98-181): # Atlantic standard time # eastern standard time # central standard time # mountain standard time # Pacific standard time # Yukon standard time # Alaska-Hawaii standard time # Bering standard time # And after 1983-11-30: # Atlantic standard time # eastern standard time # central standard time # mountain standard time # Pacific standard time # Alaska standard time # Hawaii-Aleutian standard time # Samoa standard time # The law doesn't give abbreviations. # # From Paul Eggert (1995-12-19): # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. # Go with Shanks. # US Eastern time, represented by New York # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule NYC 1920 only - Mar lastSun 2:00 1:00 D Rule NYC 1920 only - Oct lastSun 2:00 0 S Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D Rule NYC 1921 1954 - Sep lastSun 2:00 0 S Rule NYC 1955 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 -5:00 NYC E%sT 1967 -5:00 US E%sT # US Central time, represented by Chicago # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Chicago 1920 only - Jun 13 2:00 1:00 D Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1920 -6:00 Chicago C%sT 1936 Mar 1 2:00 -5:00 - EST 1936 Nov 15 2:00 -6:00 Chicago C%sT 1942 -6:00 US C%sT 1946 -6:00 Chicago C%sT 1967 -6:00 US C%sT # US Mountain time, represented by Denver # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D Rule Denver 1920 only - Oct lastSun 2:00 0 S Rule Denver 1921 only - May 22 2:00 0 S Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D Rule Denver 1965 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 -7:00 US M%sT 1920 -7:00 Denver M%sT 1942 -7:00 US M%sT 1946 -7:00 Denver M%sT 1967 -7:00 US M%sT # US Pacific time, represented by Los Angeles # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule CA 1948 only - Mar 14 2:00 1:00 D Rule CA 1949 only - Jan 1 2:00 0 S Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D Rule CA 1950 1961 - Sep lastSun 2:00 0 S Rule CA 1962 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 -8:00 US P%sT 1946 -8:00 CA P%sT 1967 -8:00 US P%sT # Alaska # AK%sT is the modern abbreviation for -9:00 per USNO. # # From Paul Eggert (1995-12-19): # Howse writes that Alaska switched from the Julian to the Gregorian calendar, # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. # This was on 1867-10-18. We omit this transition, since we can't represent # changes from Julian to Gregorian. # # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 -8:00 - PST 1969 -8:00 US P%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 -9:00 - YST 1942 -9:00 US Y%sT 1946 -9:00 - YST 1969 -9:00 US Y%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 -10:00 - CAT 1942 -10:00 US CAT/CAWT 1946 -10:00 - CAT 1967 Apr -10:00 - AHST 1969 -10:00 US AH%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -10:00 US HA%sT # Shanks writes that part of southwest Alaska (e.g. Aniak) # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, # and another part (e.g. Akiak) made the same switch five weeks later. # These switches don't quite make our 1970 cutoff. # Hawaii # # From Arthur David Olson: # And then there's Hawaii. # DST was observed for one day in 1933; # standard time was changed by half an hour in 1947; # it's always standard as of 1986. # # From Paul Eggert: # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. # Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 -10:30 - HST 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 21 2:00 -10:30 US H%sT 1947 Jun 8 2:00 -10:00 - HST Zone Pacific/Midway -11:49:28 - LMT 1901 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa # Now we turn to US areas that have diverged from the consensus since 1970. # Arizona mostly uses MST. Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 -7:00 US M%sT 1944 Jan 1 00:01 -7:00 - MST 1944 Mar 17 00:01 -7:00 US M%sT 1944 Oct 1 00:01 -7:00 - MST 1967 -7:00 US M%sT 1968 -7:00 - MST # From Arthur David Olson (1988-02-13): # A writer from the Inter Tribal Council of Arizona, Inc., # notes in private correspondence dated 12/28/87 that "Presently, only the # Navajo Nation participates in the Daylight Saving Time policy, due to its # large size and location in three states." (The "only" means that other # tribal nations don't use DST.) Link America/Denver America/Shiprock # Southern Idaho and eastern Oregon switched four weeks late in 1974. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 -8:00 US P%sT 1923 May 13 2:00 -7:00 US M%sT 1974 -7:00 - MST 1974 Feb 3 2:00 -7:00 US M%sT # Indiana # # From Paul Eggert (1995-12-19): # Indiana generally observes either EST all year, or CST/CDT, # but areas near Cincinnati and Louisville use those cities' timekeeping # and in 1969 and 1970 the whole state observed daylight time; # and there are other exceptions as noted below. # Shanks partitions Indiana into 345 regions, each with its own time history, # and writes ``Even newspaper reports present contradictory information.'' # Fortunately, most of the complexity occurred before our cutoff date of 1970. # # Since 1970, EST-only Indiana has been like America/Indianapolis, # with exceptions noted below for Crawford, Starke, and Switzerland counties. # The parts of Indiana not listed below have been like America/Chicago, # America/Louisville, or America/New_York. # # Other than Indianapolis, the Indiana place names are so nondescript # that they would be ambiguous if we left them at the `America' level. # So we reluctantly put them all in a subdirectory `America/Indiana'. # # Most of EST-only Indiana last observed DST in 1970. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1920 -6:00 Indianapolis C%sT 1942 -6:00 US C%sT 1946 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 -5:00 - EST 1957 Sep 29 2:00 -6:00 - CST 1958 Apr 27 2:00 -5:00 - EST 1969 -5:00 US E%sT 1971 -5:00 - EST Link America/Indianapolis America/Indiana/Indianapolis # # Part of Crawford County, Indiana, last observed DST in 1975, # and left its clocks alone in 1974. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D Rule Marengo 1951 only - Sep lastSun 2:00 0 S Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1951 -6:00 Marengo C%sT 1961 Apr 30 2:00 -5:00 - EST 1969 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT 1976 -5:00 - EST # # Starke County, Indiana # From Arthur David Olson (1991-10-28): # An article on page A3 of the Sunday, 1991-10-27 Washington Post # notes that Starke County switched from Central time to Eastern time as of # 1991-10-27. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D Rule Starke 1947 1954 - Sep lastSun 2:00 0 S Rule Starke 1955 1956 - Oct lastSun 2:00 0 S Rule Starke 1957 1958 - Sep lastSun 2:00 0 S Rule Starke 1959 1961 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1947 -6:00 Starke C%sT 1962 Apr 29 2:00 -5:00 - EST 1963 Oct 27 2:00 -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST # # Switzerland County, Indiana, last observed DST in 1972. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1954 Apr 25 2:00 -5:00 - EST 1969 -5:00 US E%sT 1973 -5:00 - EST # Part of Kentucky left its clocks alone in 1974. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Louisville 1921 only - May 1 2:00 1:00 D Rule Louisville 1921 only - Sep 1 2:00 0 S Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D Rule Louisville 1941 only - Sep lastSun 2:00 0 S Rule Louisville 1946 only - Jun 2 2:00 0 S Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1921 -6:00 Louisville C%sT 1942 -6:00 US C%sT 1946 -6:00 Louisville C%sT 1961 Jul 23 2:00 -5:00 - EST 1968 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT # Michigan # # From Bob Devine (1988-01-28): # Michigan didn't observe DST from 1968 to 1973. # # From Paul Eggert (1995-12-19): # Shanks writes that Michigan started using standard time on 1885 Sep 18, # but Howse (p 126) writes that Detroit kept # # local time until 1900 when the City Council decreed that clocks should # be put back twenty-eight minutes to Central Standard Time. Half the # city obeyed, half refused. After considerable debate, the decision # was rescinded and the city reverted to Sun time. A derisive offer to # erect a sundial in front of the city hall was referred to the # Committee on Sewers. Then, in 1905, Central time was adopted # by city vote. # # This story is too entertaining to be false, so go with Howse over Shanks. # # Most of Michigan observed DST from 1973 on, but was a bit late in 1975. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D Rule Detroit 1948 only - Sep lastSun 2:00 0 S Rule Detroit 1967 only - Jun 14 2:00 1:00 D Rule Detroit 1967 only - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Detroit -5:32:11 - LMT 1905 -6:00 - CST 1915 May 15 2:00 -5:00 - EST 1942 -5:00 US E%sT 1946 -5:00 Detroit E%sT 1973 -5:00 US E%sT 1975 -5:00 - EST 1975 Apr 27 2:00 -5:00 US E%sT # # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D Rule Menominee 1946 only - Sep lastSun 2:00 0 S Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D Rule Menominee 1966 only - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 -6:00 US C%sT 1946 -6:00 Menominee C%sT 1969 Apr 27 2:00 -5:00 - EST 1973 Apr 29 2:00 -6:00 US C%sT # Navassa # uninhabited # Old names, for S5 users # Link LINK-FROM LINK-TO Link America/New_York EST5EDT Link America/Chicago CST6CDT Link America/Denver MST7MDT Link America/Los_Angeles PST8PDT Link America/Indianapolis EST Link America/Phoenix MST Link Pacific/Honolulu HST ################################################################################ # From Paul Eggert (1996-11-22): # A good source for time zone historical data outside the US is # Thomas G. Shanks, The International Atlas (3rd edition), # San Diego: ACS Publications, Inc. (1991). # # Gwillim Law writes that a good source # for recent time zone data is the International Air Transport # Association's Standard Schedules Information Manual (IATA SSIM), # published semiannually. Law sent in several helpful summaries # of the IATA's data after 1990. # # Except where otherwise noted, Shanks is the source for entries through 1990, # and IATA SSIM is the source for entries after 1990. # # Another source occasionally used is Edward W. Whitman, World Time Differences, # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which # I found in the UCLA library. # # See the `europe' file for Greenland. # # See the `africa' file for time zone naming and abbreviation conventions. # Canada # From Alain LaBont (1994-11-14): # I post here the time zone abbreviations standardized in Canada # for both English and French in the CAN/CSA-Z234.4-89 standard.... # # UTC Standard time Daylight savings time # offset French English French English # -2:30 - - HAT NDT # -3 - - HAA ADT # -3:30 HNT NST - - # -4 HNA AST HAE EDT # -5 HNE EST HAC CDT # -6 HNC CST HAR MDT # -7 HNR MST HAP PDT # -8 HNP PST HAY YDT # -9 HNY YST - - # # HN: Heure Normale ST: Standard Time # HA: Heure Avance DT: Daylight saving Time # # A: de l'Atlantique Atlantic # C: du Centre Central # E: de l'Est Eastern # M: Mountain # N: Newfoundland # P: du Pacifique Pacific # R: des Rocheuses # T: de Terre-Neuve # Y: du Yukon Yukon # # From Paul Eggert (1994-11-22): # Alas, this sort of thing must be handled by localization software. # The data for Canada are all from Shanks (1991). # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Canada 1918 only - Apr 14 2:00 1:00 D Rule Canada 1918 only - Oct 31 2:00 0 S Rule Canada 1942 only - Feb 9 2:00 1:00 D Rule Canada 1945 only - Sep 30 2:00 0 S Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D Rule Canada 1974 max - Oct lastSun 2:00 0 S Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D # Newfoundland (except Labrador) # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D Rule StJohns 1917 only - Sep 17 2:00 0 S Rule StJohns 1918 only - Oct 31 2:00 0 S # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. Rule StJohns 1919 only - May 5 23:00 1:00 D Rule StJohns 1919 only - Aug 12 23:00 0 S # For 1931-1935 Whitman gives Apr same date; go with Shanks. Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. Rule StJohns 1942 only - Mar 1 0:00 1:00 D Rule StJohns 1942 only - Dec 31 0:00 0 S Rule StJohns 1943 only - May 30 0:00 1:00 D Rule StJohns 1943 only - Sep 5 0:00 0 S Rule StJohns 1944 only - Jul 10 0:00 1:00 D Rule StJohns 1944 only - Sep 2 0:00 0 S Rule StJohns 1945 only - Jan 1 0:00 1:00 D Rule StJohns 1945 only - Oct 7 2:00 0 S # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives # Apr 30 - Sep 24; go with Shanks. Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S Rule StJohns 1960 max - Oct lastSun 2:00 0 S Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D # St John's has an apostrophe, but Posix file names can't have apostrophes. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Johns -3:30:52 - LMT 1884 -3:30:52 StJohns N%sT 1935 Mar 30 -3:30 StJohns N%sT # east Labrador # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay -3:30:52 StJohns NST 1919 -3:30:52 - NST 1935 Mar 30 -3:30 - NST 1936 -3:30 StJohns N%sT 1966 Mar 15 2:00 -4:00 StJohns A%sT # west Labrador, New Brunswick, Nova Scotia, Prince Edward I # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Halifax. # Many locales did not observe peacetime DST until 1972; # Glace Bay, NS is the largest that we know of. # Shanks also writes that Liverpool, NS was the only town in Canada to observe # DST in 1971 but not 1970; for now we'll assume this is a typo. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Halifax 1916 only - Apr 1 0:00 1:00 D Rule Halifax 1916 only - Oct 1 0:00 0 S Rule Halifax 1918 only - Apr 14 2:00 1:00 D Rule Halifax 1918 only - Oct 31 2:00 0 S Rule Halifax 1920 only - May 9 0:00 1:00 D Rule Halifax 1920 only - Aug 29 0:00 0 S Rule Halifax 1921 only - May 6 0:00 1:00 D Rule Halifax 1921 1922 - Sep 5 0:00 0 S Rule Halifax 1922 only - Apr 30 0:00 1:00 D Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D Rule Halifax 1923 only - Sep 4 0:00 0 S Rule Halifax 1924 only - Sep 15 0:00 0 S Rule Halifax 1925 only - Sep 28 0:00 0 S Rule Halifax 1926 only - May 16 0:00 1:00 D Rule Halifax 1926 only - Sep 13 0:00 0 S Rule Halifax 1927 only - May 1 0:00 1:00 D Rule Halifax 1927 only - Sep 26 0:00 0 S Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D Rule Halifax 1928 only - Sep 9 0:00 0 S Rule Halifax 1929 only - Sep 3 0:00 0 S Rule Halifax 1930 only - Sep 15 0:00 0 S Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S Rule Halifax 1933 only - Apr 30 0:00 1:00 D Rule Halifax 1933 only - Oct 2 0:00 0 S Rule Halifax 1934 only - May 20 0:00 1:00 D Rule Halifax 1934 only - Sep 16 0:00 0 S Rule Halifax 1935 only - Jun 2 0:00 1:00 D Rule Halifax 1935 only - Sep 30 0:00 0 S Rule Halifax 1936 only - Jun 1 0:00 1:00 D Rule Halifax 1936 only - Sep 14 0:00 0 S Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S Rule Halifax 1939 only - May 28 0:00 1:00 D Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D Rule Halifax 1942 only - Feb 9 2:00 1:00 D Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D Rule Halifax 1962 max - Oct lastSun 2:00 0 S Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 -4:00 Halifax A%sT Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 -4:00 Canada A%sT 1953 -4:00 Halifax A%sT 1954 -4:00 - AST 1972 -4:00 Halifax A%sT # Ontario, Quebec # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Montreal. # Thunder Bay skipped DST in 1973. # Many smaller locales did not observe peacetime DST until 1974; # Nipigon (EST) and Rainy River (CST) are the largest that we know of. # Far west Ontario is like Winnipeg; far east Quebec is like Halifax. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mont 1917 only - Mar 25 2:00 1:00 D Rule Mont 1917 only - Apr 24 0:00 0 S Rule Mont 1918 only - Apr 14 2:00 1:00 D Rule Mont 1918 only - Oct 31 2:00 0 S Rule Mont 1919 only - Mar 31 2:30 1:00 D Rule Mont 1919 only - Oct 25 2:30 0 S Rule Mont 1920 only - May 2 2:30 1:00 D Rule Mont 1920 only - Oct 3 2:30 0 S Rule Mont 1921 only - May 1 2:00 1:00 D Rule Mont 1921 only - Oct 2 2:30 0 S Rule Mont 1922 only - Apr 30 2:00 1:00 D Rule Mont 1922 only - Oct 1 2:30 0 S Rule Mont 1924 only - May 17 2:00 1:00 D Rule Mont 1924 1926 - Sep lastSun 2:30 0 S Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D Rule Mont 1927 only - May 1 0:00 1:00 D Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D Rule Mont 1932 only - May 1 0:00 1:00 D Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D Rule Mont 1933 only - Oct 1 0:00 0 S Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S Rule Mont 1945 1948 - Sep lastSun 2:00 0 S Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D Rule Mont 1949 1950 - Oct lastSun 2:00 0 S Rule Mont 1951 1956 - Sep lastSun 2:00 0 S Rule Mont 1957 max - Oct lastSun 2:00 0 S Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Montreal -4:54:16 - LMT 1884 -5:00 Mont E%sT Zone America/Thunder_Bay -5:57:00 - LMT 1895 -5:00 Canada E%sT 1970 -5:00 Mont E%sT 1973 -5:00 - EST 1974 -5:00 Canada E%sT Zone America/Nipigon -5:53:04 - LMT 1895 -5:00 Canada E%sT Zone America/Rainy_River -6:17:56 - LMT 1895 -6:00 Canada C%sT # Manitoba # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Winn 1916 only - Apr 23 0:00 1:00 D Rule Winn 1916 only - Sep 17 0:00 0 S Rule Winn 1918 only - Apr 14 2:00 1:00 D Rule Winn 1918 only - Oct 31 2:00 0 S Rule Winn 1937 only - May 16 2:00 1:00 D Rule Winn 1937 only - Sep 26 2:00 0 S Rule Winn 1942 only - Feb 9 2:00 1:00 D Rule Winn 1945 only - Sep lastSun 2:00 0 S Rule Winn 1946 only - May 12 2:00 1:00 D Rule Winn 1946 only - Oct 13 2:00 0 S Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D Rule Winn 1947 1949 - Sep lastSun 2:00 0 S Rule Winn 1950 only - May 1 2:00 1:00 D Rule Winn 1950 only - Sep 30 2:00 0 S Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D Rule Winn 1951 1958 - Sep lastSun 2:00 0 S Rule Winn 1959 only - Oct lastSun 2:00 0 S Rule Winn 1960 only - Sep lastSun 2:00 0 S Rule Winn 1963 only - Apr lastSun 2:00 1:00 D Rule Winn 1963 only - Sep 22 2:00 0 S Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D Rule Winn 1966 max - Oct lastSun 2:00 0 S Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 -6:00 Winn C%sT # Saskatchewan # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Regina. # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. # Other western towns (e.g. Lloydminster) are like Edmonton. # From W. Jones (1992-11-06): # The. . .below is based on information I got from our law library, the # provincial archives, and the provincial Community Services department. # A precise history would require digging through newspaper archives, and # since you didn't say what you wanted, I didn't bother. # # Saskatchewan is split by a time zone meridian (105W) and over the years # the boundary became pretty ragged as communities near it reevaluated # their affiliations in one direction or the other. In 1965 a provincial # referendum favoured legislating common time practices. # # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of # Saskatchewan 1978) was proclaimed, and established that the eastern # part of Saskatchewan would use CST year round, that districts in # northwest Saskatchewan would by default follow CST but could opt to # follow Mountain Time rules (thus 1 hour difference in the winter and # zero in the summer), and that districts in southwest Saskatchewan would # by default follow MT but could opt to follow CST. # # It took a few years for the dust to settle (I know one story of a town # on one time zone having its school in another, such that a mom had to # serve her family lunch in two shifts), but presently it seems that only # a few towns on the border with Alberta (e.g. Lloydminster) follow MT # rules any more; all other districts appear to have used CST year round # since sometime in the 1960s. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Regina 1918 only - Apr 14 2:00 1:00 D Rule Regina 1918 only - Oct 31 2:00 0 S Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D Rule Regina 1937 only - Oct Sun>=8 0:00 0 S Rule Regina 1938 only - Oct Sun>=1 0:00 0 S Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S Rule Regina 1942 only - Feb 9 2:00 1:00 D Rule Regina 1945 only - Sep lastSun 2:00 0 S Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D Rule Regina 1946 only - Oct Sun>=8 2:00 0 S Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D Rule Regina 1947 1958 - Sep lastSun 2:00 0 S Rule Regina 1959 only - Oct lastSun 2:00 0 S # Rule Swift 1957 only - Apr lastSun 2:00 1:00 D Rule Swift 1957 only - Oct lastSun 2:00 0 S Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D Rule Swift 1959 only - Oct lastSun 2:00 0 S Rule Swift 1960 1961 - Sep lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Regina -6:58:36 - LMT 1905 Sep -7:00 Regina M%sT 1960 Apr lastSun 2:00 -6:00 - CST Zone America/Swift_Current -7:11:20 - LMT 1905 Sep -7:00 Canada M%sT 1946 Apr lastSun 2:00 -7:00 Regina M%sT 1950 -7:00 Swift M%sT 1972 Apr lastSun 2:00 -6:00 - CST # Alberta # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D Rule Edm 1918 only - Oct 31 2:00 0 S Rule Edm 1919 only - May 27 2:00 0 S Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D Rule Edm 1920 only - Oct lastSun 2:00 0 S Rule Edm 1921 1923 - Sep lastSun 2:00 0 S Rule Edm 1942 only - Feb 9 2:00 1:00 D Rule Edm 1945 only - Sep lastSun 2:00 0 S Rule Edm 1947 only - Apr lastSun 2:00 1:00 D Rule Edm 1947 only - Sep lastSun 2:00 0 S Rule Edm 1967 only - Apr lastSun 2:00 1:00 D Rule Edm 1967 only - Oct lastSun 2:00 0 S Rule Edm 1969 only - Apr lastSun 2:00 1:00 D Rule Edm 1969 only - Oct lastSun 2:00 0 S Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D Rule Edm 1972 max - Oct lastSun 2:00 0 S Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Edmonton -7:33:52 - LMT 1906 Sep -7:00 Edm M%sT # British Columbia # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Vancouver. # Dawswon Creek uses MST. Much of east BC is like Edmonton. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Vanc 1918 only - Apr 14 2:00 1:00 D Rule Vanc 1918 only - Oct 31 2:00 0 S Rule Vanc 1942 only - Feb 9 2:00 1:00 D Rule Vanc 1945 only - Sep 30 2:00 0 S Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D Rule Vanc 1946 only - Oct 13 2:00 0 S Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S Rule Vanc 1962 max - Oct lastSun 2:00 0 S Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Vancouver -8:12:28 - LMT 1884 -8:00 Vanc P%sT Zone America/Dawson_Creek -8:00:56 - LMT 1884 -8:00 Canada P%sT 1947 -8:00 Vanc P%sT 1972 Aug 30 2:00 -7:00 - MST # Northwest Territories, Yukon # From Paul Eggert (1996-10-07): # Dawson switched to PST in 1973. Inuvik switched to MST in 1979. # Shanks's table for Watson Lake is corrupted, so we have no data there. # Mathew Englander (1996-10-07) gives the following refs: # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, # c. 7 defines Yukon standard time as UTC-9. This is still valid; # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. # * O.I.C. 1980/02 established DST. # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule NT_YK 1918 only - Apr 14 2:00 1:00 D Rule NT_YK 1918 only - Oct 27 2:00 0 S Rule NT_YK 1919 only - May 25 2:00 1:00 D Rule NT_YK 1919 only - Nov 1 0:00 0 S Rule NT_YK 1942 only - Feb 9 2:00 1:00 D Rule NT_YK 1945 only - Sep 30 2:00 0 S Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD Rule NT_YK 1965 only - Oct lastSun 2:00 0 S Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D Rule NT_YK 1980 max - Oct lastSun 2:00 0 S Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Pangnirtung -4:22:56 - LMT 1884 -4:00 NT_YK A%sT Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay -5:00 NT_YK E%sT Zone America/Rankin_Inlet -6:08:40 - LMT 1884 -6:00 NT_YK C%sT Zone America/Yellowknife -7:37:24 - LMT 1884 -7:00 NT_YK M%sT Zone America/Inuvik -8:54:00 - LMT 1884 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 -7:00 NT_YK M%sT Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 -8:00 NT_YK P%sT Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 -8:00 NT_YK P%sT ############################################################################### # Mexico # From Guy Harris: # Rules are from the Official Airline Guide, Worldwide Edition, for 1987. # Rules prior to 1987 are unknown. # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana # observe DST." This is presumably Baja California Norte, above 28th parallel, # as listed there; [there is also] "Baja California Sur and N. Pacific # Coast (States of Sinaloa and Sonora)." # From Bob Devine (1988-01-28): # The Federal District (where Mexico City is) has observed [DST] several # times but not recently. # # I don't where to drawn the line in the North Baja area. 28th latitude # sounds good -- but it may be higher (how far [d]o radio stations from # San Diego affect culture?). # # The dates of DST probably go back to 1981. The rules are the same as # US's. This is going to be a headache for US presidential electi[o]n years! # From Arthur David Olson (1988-02-13) # Since the 1981 starting date is only "probable," we'll keep the 1987 # starting date below. # From U. S. Naval Observatory (1989-01-19): # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND # MEXICO BAJA CAL N N. PACIFIC COAST (STATES # MEXICO BAJA CAL N OF SINALOA AND SONORA) # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 # MEXICO BAJA CAL N - OCT 29 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 # MEXICO BAJA CAL N - 0CT 29 # MEXICO 6 H BEHIND UTC STATES OF DURANGO, # MEXICO COAHUILA, NUEVO LEON, # MEXICO TAMAULIPAS # MEXICO 5 H BEHIND UTC STATES OF DURANGO, # MEXICO COAHUILA, NUEVO LEON, # MEXICO TAMAULIPAS APR 3 - OCT 29 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF # MEXICO CAMPECHE, QUINTANA ROO AND # MEXICO YUCATAN # From Arthur David Olson (1989-01-21): # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. # USNO claims there should be four Mexican zones rather than three: # a zone that's GMT-8 with DST; a zone that's always GMT-7; # a zone that's GMT-6 with DST; and a zone that's always GMT-6. # From Paul Eggert (1993-11-18): # Shanks also says there are four zones, but disagrees about the fourth. # Instead of GMT-6 with DST, he says there's GMT-8 without DST. # From Alan Perry (1996-02-15): # A guy from our Mexico subsidiary finally found the Presidential Decree # outlining the timezone changes in Mexico. # # ------------- Begin Forwarded Message ------------- # # I finally got my hands on the Official Presidential Decree that sets up the # rules for the DST changes. The rules are: # # 1. The country is divided in 3 timezones: # - Baja California Norte (the Mexico/BajaNorte TZ) # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) # - The rest of the country (the Mexico/General TZ) # # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October # at 2:00 AM, the times in each zone are as follows: # BajaNorte: GMT+7 # BajaSur: GMT+6 # General: GMT+5 # # 3. The rest of the year, the times are as follows: # BajaNorte: GMT+8 # BajaSur: GMT+7 # General: GMT+6 # # The Decree was published in Mexico's Official Newspaper on January 4th. # # -------------- End Forwarded Message -------------- # From Paul Eggert (1996-06-12): # For an English translation of the decree, # see ``Diario Oficial: Time Zone Changeover'', # (1996-01-04). # From Shanks (1991): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mexico 1939 only - Feb 5 0:00 1:00 D Rule Mexico 1939 only - Jun 25 0:00 0 S Rule Mexico 1940 only - Dec 9 0:00 1:00 D Rule Mexico 1941 only - Apr 1 0:00 0 S Rule Mexico 1943 only - Dec 16 0:00 1:00 D Rule Mexico 1944 only - May 1 0:00 0 S Rule Mexico 1950 only - Feb 12 0:00 1:00 D Rule Mexico 1950 only - Jul 30 0:00 0 S Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D Rule Mexico 1996 max - Oct lastSun 2:00 0 S # Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 -6:00 Mexico C%sT Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 -6:00 - CST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 Mexico M%sT Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 -8:00 - PST 1927 Jun 10 23:00 -7:00 - MST 1930 Nov 16 -8:00 - PST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 -8:00 US P%sT 1996 -8:00 Mexico P%sT Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 -8:00 - PST 1927 Jun 10 23:00 -7:00 - MST 1930 Nov 16 -8:00 - PST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 - PST 1996 -8:00 Mexico P%sT # # Revillagigedo Is # no information ############################################################################### # Anguilla # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 -4:00 - AST # Antigua and Barbuda # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 -5:00 - EST 1951 -4:00 - AST # Bahamas # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Bahamas 1964 max - Oct lastSun 2:00 0 S Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 -5:00 Bahamas E%sT # Barbados # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Barb 1977 only - Jun 12 2:00 1:00 D Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D Rule Barb 1979 only - Sep 30 2:00 0 S Rule Barb 1980 only - Sep 25 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown -3:58 - BMT 1932 # Bridgetown Mean Time -4:00 Barb A%sT # Belize # Whitman entirely disagrees with Shanks; go with Shanks. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S Rule Belize 1973 only - Dec 5 0:00 1:00 D Rule Belize 1974 only - Feb 9 0:00 0 S Rule Belize 1982 only - Dec 18 0:00 1:00 D Rule Belize 1983 only - Feb 12 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Belize -5:52:48 - LMT 1912 Apr -6:00 Belize C%sT # Bermuda # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton -4:00 - AST 1974 Apr 28 2:00 -4:00 Bahamas A%sT # Cayman Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST # Clipperton # uninhabited # Costa Rica # Shanks gives some very odd dates for 1991, and stops there. # For now, we won't guess further. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. Rule CR 1991 only - Jul 1 0:00 0 S Rule CR 1992 only - Mar 15 0:00 0 S # There are too many San Joses elsewhere, so we'll use `Costa Rica'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time -6:00 CR C%sT # Coco # no information; probably like America/Costa_Rica # Cuba # From Bob Devine (1988-01-28): # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March # (I think). # From U. S. Naval Observatory (1989-01-19): # CUBA 5 H BEHIND UTC # CUBA 4 H BEHIND UTC MAR 20 - OCT 8 # From Shanks (1991): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Cuba 1928 only - Jun 10 0:00 1:00 D Rule Cuba 1928 only - Oct 10 0:00 0 S Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S Rule Cuba 1965 only - Jun 1 0:00 1:00 D Rule Cuba 1965 only - Sep 30 0:00 0 S Rule Cuba 1966 only - May 29 0:00 1:00 D Rule Cuba 1966 only - Oct 2 0:00 0 S Rule Cuba 1967 only - Apr 8 0:00 1:00 D Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S Rule Cuba 1968 only - Apr 14 0:00 1:00 D Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S Rule Cuba 1972 1974 - Oct 8 0:00 0 S Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S Rule Cuba 1978 only - May 7 0:00 1:00 D Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D Rule Cuba 1981 1990 - Oct Sun>=8 0:00 0 S Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S Rule Cuba 1996 max - Oct Sun>=1 0:00s 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Havana -5:29:28 - LMT 1890 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT -5:00 Cuba C%sT # Dominica # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau -4:00 - AST # Dominican Republic # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule DR 1966 only - Oct 30 0:00 1:00 D Rule DR 1967 only - Feb 28 0:00 0 S Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD Rule DR 1970 only - Feb 21 0:00 0 S Rule DR 1971 only - Jan 20 0:00 0 S Rule DR 1972 1974 - Jan 21 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Santo_Domingo -4:39:36 - LMT 1890 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT -5:00 DR E%sT 1974 Oct 27 -4:00 - AST # El Salvador # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D Rule Salv 1987 1988 - Sep lastSun 0:00 0 S # There are too many San Salvadors elsewhere, so we'll use `El Salvador'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador -6:00 Salv C%sT # Grenada # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's -4:00 - AST # Guadeloupe # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre -4:00 - AST # Guatemala # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Guat 1973 only - Nov 25 0:00 1:00 D Rule Guat 1974 only - Feb 24 0:00 0 S Rule Guat 1983 only - May 21 0:00 1:00 D Rule Guat 1983 only - Sep 22 0:00 0 S Rule Guat 1991 only - Mar 23 0:00 1:00 D Rule Guat 1991 only - Sep 7 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 -6:00 Guat C%sT # Haiti # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Haiti 1983 only - May 8 0:00 1:00 D Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA. Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D Rule Haiti 1988 max - Oct lastSun 1:00s 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Port-au-Prince -4:49:20 - LMT 1890 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT -5:00 Haiti E%sT # Honduras # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr -6:00 Salv C%sT # Jamaica # From Bob Devine (1988-01-28): # Follows US rules. # From U. S. Naval Observatory (1989-01-19): # JAMAICA 5 H BEHIND UTC # From Shanks (1991): # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST 1974 Jan 6 2:00 -5:00 US E%sT 1984 -5:00 - EST # Martinique # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France -4:04 - FFMT 1911 May # Fort-de-France MT -4:00 - AST 1980 Apr 6 -4:00 1:00 ADT 1980 Sep 28 -4:00 - AST # Montserrat # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth -4:00 - AST # Nicaragua # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S Rule Nic 1992 only - Jan 1 4:00 1:00 D Rule Nic 1992 only - Sep 24 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Managua -5:45:08 - LMT 1890 -5:45 - MMT 1934 Jun 23 # Managua Mean Time -6:00 - CST 1973 May -5:00 - EST 1975 Feb 16 -6:00 Nic C%sT 1993 Jan 1 4:00 -5:00 - EST # Panama # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Panama -5:18:08 - LMT 1890 -5:20 - PMT 1908 Apr 22 # Panama Mean Time -5:00 - EST # Puerto Rico # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan -4:00 - AST 1942 May 3 -4:00 1:00 AWT 1945 Sep 30 2:00 -4:00 - AST # St Kitts-Nevis # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre -4:00 - AST # St Lucia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries -4:04 - CMT 1912 # Castries Mean Time -4:00 - AST # St Pierre and Miquelon # There are too many St Pierres elsewhere, so we'll use `Miquelon'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre -4:00 - AST 1980 May -3:00 Mont PM%sT # Pierre & Miquelon Time # St Vincent and the Grenadines # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown -4:05 - KMT 1912 # Kingstown Mean Time -4:00 - AST # Turks and Caicos # From Paul Eggert (1996-11-22): # Shanks says they use US DST rules, but IATA SSIM (1991/1996) # says they switch at midnight. Go with IATA SSIM. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D Rule TC 1979 max - Oct lastSun 0:00 0 S Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 TC E%sT # British Virgin Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town -4:00 - AST # Virgin Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie -4:00 - AST @ 1.10 log @merge tzdata1997d @ text @@ 1.9 log @sync with tzdata96m @ text @d1 1 a1 1 # @@(#)northamerica 7.29 d923 1 a923 1 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 d925 1 a925 1 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 @ 1.8 log @sync with tzdata96k @ text @d1 1 a1 1 # @@(#)northamerica 7.27 d8 1 a8 1 # From Paul Eggert (August 17, 1994): d44 2 a45 2 # See, for example, the front page of the Saturday, October 26, 1974 # and Sunday, October 27, 1974 editions of the Washington Post. d63 1 a63 1 # From Bob Devine (January 28, 1988): d79 1 a79 1 # From U. S. Naval Observatory (January 19, 1989): d95 1 a95 1 # From Arthur David Olson (January 21, 1989): d101 1 a101 1 # From Arthur David Olson (February 13, 1988): d104 1 a104 1 # up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 d114 1 a114 1 # Next, names from April 1, 1967 until November 30, 1983 (the date for d124 1 a124 1 # And after November 30, 1983: d280 1 a280 1 # From Arthur David Olson (February 13, 1988): d353 2 a354 2 # From Arthur David Olson (October 28, 1991): # An article on page A3 of the Sunday, October 27, 1991 Washington Post d356 1 a356 1 # October 27, 1991. d401 1 a401 1 # From Bob Devine (January 28, 1988): d465 1 a465 1 # From Paul Eggert (November 18, 1993): d469 9 a477 1 # Except where otherwise noted, it is the source for the data below. d534 1 a534 1 # Newfoundland d571 1 a571 1 -3:31 StJohns N%sT 1935 Mar 30 d575 13 a587 1 # Labrador, New Brunswick, Nova Scotia, Prince Edward I d737 1 a737 1 # From W. Jones (November 6, 1992): d848 1 a848 1 # From Paul Eggert (1996-06-12): d851 8 d888 1 a888 1 -9:00 NT_YK Y%sT 1973 Oct lastSun 2:00 d904 1 a904 1 # From Bob Devine (January 28, 1988): d915 1 a915 1 # From Arthur David Olson (February 13, 1988) d919 1 a919 1 # From U. S. Naval Observatory (January 19, 1989): d937 1 a937 1 # From Arthur David Olson (January 21, 1989): d1101 4 a1104 2 Rule CR 1991 only - Jan 19 0:00 1:00 D Rule CR 1991 only - Jul 1 0:00 0 S d1115 1 a1115 1 # From Bob Devine (January 28, 1988): d1120 1 a1120 1 # From U. S. Naval Observatory (January 19, 1989): d1147 1 a1147 1 Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S d1149 3 a1151 2 Rule Cuba 1990 only - Apr 1 0:00 1:00 D Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D d1202 2 d1213 3 a1215 2 Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D Rule Haiti 1988 max - Oct lastSun 2:00 0 S d1229 1 a1229 1 # From Bob Devine (January 28, 1988): d1232 1 a1232 1 # From U. S. Naval Observatory (January 19, 1989): d1240 2 a1241 1 -5:00 US E%sT d1260 2 d1267 2 a1268 1 -6:00 Nic C%sT d1309 7 d1319 1 a1319 2 -5:00 - EST 1979 Apr 29 2:00 -5:00 US E%sT @ 1.7 log @sync with tzdata96h @ text @d1 1 a1 1 # @@(#)northamerica 7.25 d24 18 d205 3 a207 3 # and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it # from Russia. We omit this transition, since we can't represent changes # from Julian to Gregorian. a474 3 # I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. # Corrections are welcome! # d477 1 a477 1 # See the `africa' file for Zone naming conventions. a480 72 # Canada is reportedly lots easier than the US--leastways since 1951. # I don't know what they did before then. # 4.3BSD claims that it's perfectly regular. # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, # "...Canada (well, Ontario and at least some of the other provinces) are # adopting the new daylight savings time rules...". We assume all of # Canada is doing so. # From Bob Devine (January 28, 1988): # All of Canada did have DST from your first rule except Saskatchewan. # Which parts did not observe DST is hard to pinpoint but most of the # province follows the rules. # NOTE: those that didn't have DST for that rule, also # probably did not have it for several years previous. # From U. S. Naval Observatory (January 19, 1989): # CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S # CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 # CANADA ATLANTIC 4 H BEHIND UTC HALIFAX # CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 # CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA # CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 # CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG # CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 # CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON # CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 # CANADA PACIFIC 8 H BEHIND UTC VANCOUVER # CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 # CANADA YUKON SAME AS PACIFIC DAWSON # From Arthur David Olson (January 21, 1989): # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. # Note claim that there's double DST in Newfoundland and that Yukon should # be same as Pacific. # From W. Jones (jones@@skdad.usask.ca) (November 6, 1992): # The. . .below is based on information I got from our law library, the # provincial archives, and the provincial Community Services department. # A precise history would require digging through newspaper archives, and # since you didn't say what you wanted, I didn't bother. # # Saskatchewan is split by a time zone meridian (105W) and over the years # the boundary became pretty ragged as communities near it reevaluated # their affiliations in one direction or the other. In 1965 a provincial # referendum favoured legislating common time practices. # # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of # Saskatchewan 1978) was proclaimed, and established that the eastern # part of Saskatchewan would use CST year round, that districts in # northwest Saskatchewan would by default follow CST but could opt to # follow Mountain Time rules (thus 1 hour difference in the winter and # zero in the summer), and that districts in southwest Saskatchewan would # by default follow MT but could opt to follow CST. # # It took a few years for the dust to settle (I know one story of a town # on one time zone having its school in another, such that a mom had to # serve her family lunch in two shifts), but presently it seems that only # a few towns on the border with Alberta (e.g. Lloydminster) follow MT # rules any more; all other districts appear to have used CST year round # since sometime in the 1960s. # # Here's how I would summarize things. Establish a "Saskatchewan" CST # time zone, and note that it officially exists as of 15 April 1966. Any # current exceptions can put themselves in the "Mountain" zone, since # those are the rules they follow. Any past exceptions can be forgotten, # since that's what those who live here have done. # From Arthur David Olson (November 21, 1992): # East-Saskatchewan kept to avoid problems for folks using that zone by name; # plain Saskatchewan added. d513 15 a527 1 # From Shanks (1991): d566 10 d620 15 d668 12 d709 34 d754 11 a764 4 Rule Regina 1946 only - Apr 14 2:00 1:00 D Rule Regina 1946 only - Oct 13 2:00 0 S Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D Rule Regina 1947 1959 - Sep lastSun 2:00 0 S d766 7 a772 2 Zone America/Regina -6:58:36 - LMT 1905 Sep -7:00 Regina M%sT 1966 Apr 15 d775 3 d800 7 d820 11 d833 23 a855 11 Rule Yukon 1918 only - Apr 14 2:00 1:00 D Rule Yukon 1918 only - Oct 27 2:00 0 S Rule Yukon 1919 only - May 25 2:00 1:00 D Rule Yukon 1919 only - Nov 1 0:00 0 S Rule Yukon 1942 only - Feb 9 2:00 1:00 D Rule Yukon 1965 only - Apr 25 0:00 1:00 D Rule Yukon 1965 only - Oct 31 2:00 0 S Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D Rule Yukon 1980 max - Oct lastSun 2:00 0 S Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] d857 6 a862 3 -9:00 Yukon Y%sT 1966 Jul -8:00 Yukon P%sT # Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. d947 4 d1157 1 a1157 1 Zone America/Grenada -4:07:00 - LMT 1911 Jul d1262 1 a1262 1 -3:00 Mont SP%sT @ 1.6 log @sync with tzdata96d @ text @d1 1 a1 1 # @@(#)northamerica 7.22 d163 5 a167 5 -7:00 US E%sT 1920 -7:00 Denver E%sT 1942 -7:00 US E%sT 1946 -7:00 Denver E%sT 1967 -7:00 US E%sT a463 2 a569 2 a571 1 Rule StJohns 1884 only - Jan 1 0:00 0 S a609 1 Rule Halifax 1902 only - Jun 15 0:00 0 S a654 1 Rule Mont 1884 only - Jan 1 0:00 0 S a687 1 Rule Winn 1887 only - Jul 16 0:00 0 S a715 1 Rule Regina 1905 only - Sep 1 0:00 0 S a735 1 Rule Edm 1906 only - Sep 1 0:00 0 S a757 1 Rule Vanc 1884 only - Jan 1 0:00 0 S a771 1 Rule Yukon 1900 only - Jan 1 0:00 0 S d839 1 a839 1 # From Paul Eggert (November 18, 1993): d843 28 a870 8 # From Paul Eggert (1996-02-07): # Today in news:4f90v4$g6g@@news.internet.com.mx, Kevin Pitts # wrote that Mexico will use Horario de Verano (DST) # starting this year with the same rules as the US, and gave FIDE as a source. # (FIDE is a private organization that promotes efficient electrical use.) # On 1996-02-02 Mario Camou wrote that the transition times are Apr Sun>=1 # 0:00 and Nov 1 0:00 but also wrote ``The DST-out date looks a bit fishy''. # Go with Pitts after 1996, and with Shanks before that. a873 1 Rule Mexico 1922 only - Jan 1 0:00 0 S a939 1 Rule Bahamas 1912 only - Mar 2 0:00 0 S a948 1 Rule Barb 1932 only - Jan 1 0:00 0 S a961 1 Rule Belize 1912 only - Apr 1 0:00 0 S a990 1 Rule CR 1921 only - Jan 15 0:00 0 S a1015 1 Rule Cuba 1925 only - Jul 19 12:00 0 S a1053 1 Rule DR 1933 only - Apr 1 12:00 0 S a1067 1 Rule Salv 1921 only - Jan 1 0:00 0 S a1086 1 Rule Guat 1918 only - Oct 5 0:00 0 S a1096 1 Rule Haiti 1917 only - Jan 24 12:00 0 S a1142 1 Rule Nic 1975 only - Feb 16 0:00 0 S @ 1.5 log @sync with tzdata96a @ text @d1 1 a1 1 # @@(#)northamerica 7.21 d855 9 d875 3 d898 1 a898 1 -7:00 - MST d905 2 a906 1 -8:00 US P%sT d912 2 a913 1 -8:00 - PST @ 1.4 log @sync with tzdata95i @ text @d1 1 a1 1 # @@(#)northamerica 7.17 d17 7 a28 8 # From seismo!munnari!kre: # I recall also being told by someone once that Canada didn't have # the DST variations in 74/75 that the US did, but I am not nearly # sure enough of this to add anything. # From Arthur David Olson: # The above has been confirmed by Bob Devine; we'll go with it here. d34 1 a34 1 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D d57 4 d116 19 d136 50 a185 1 # From Paul Eggert (August 16, 1994): d188 41 a228 1 # from Russia. We don't have this data pinned down yet, though. d230 16 a245 3 # Easy stuff first--including Alaska, where we ignore history (since we # can't tell if we should give Yukon time or Alaska-Hawaii time for "old" # times). d247 4 a250 7 # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/New_York -5:00 US E%sT Zone America/Chicago -6:00 US C%sT Zone America/Denver -7:00 US M%sT Zone America/Los_Angeles -8:00 US P%sT Zone America/Anchorage -9:00 US AK%sT # AK%sT is the abbreviation per USNO d252 1 a252 12 # Mainland US areas that are always Standard as of 1986. Zone America/Fort_Wayne -5:00 US E%sT 1946 -5:00 - EST # Always EST as of 1986 # From Arthur David Olson (October 28, 1991): # An article on page A3 of the Sunday, October 27, 1991 Washington Post # notes that Starke County switched from Central time to Eastern time as of # October 27, 1991. Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST # Always EST as of 1991 Zone America/Phoenix -7:00 US M%sT 1946 -7:00 - MST # Always MST as of 1986 d254 8 d263 1 a263 1 # However. . .a writer from the Inter Tribal Council of Arizona, Inc., d269 9 a277 1 Link America/Denver America/Shiprock d279 104 d385 29 a413 3 Zone America/Detroit -5:00 US E%sT 1968 -5:00 - EST 1973 a414 2 # Samoa just changes names. No DST, per Naval Observatory. d416 12 a427 32 # Howse writes that in 1879 the King of Samoa decided to change # ``the date in his kingdom from the Antipodean to the American system, # ordaining -- by a masterpiece of diplomatic flattery -- that # the Fourth of July should be celebrated twice in that year.'' Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5 -11:22:48 - LMT 1911 -11:30 - SST 1950 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa Zone Pacific/Midway -11:49:28 - LMT 1901 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa # Aleutian has a name change. DST, per Naval Observatory. Zone America/Atka -10:00 US AH%sT 1983 Nov 30 -10:00 US HA%sT # From Arthur David Olson: # And then there's Hawaii. # DST was observed for one day in 1933; # Standard time was change by half an hour in 1947; # it's always standard as of 1986. Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 1 2:00 -10:30 US H%sT 1947 Jun 8 2:00 -10:00 - HST d430 1 a430 1 # no information; probably like America/New_York d440 1 a440 1 Link America/Fort_Wayne EST d448 1 a448 1 # A good source for time zone historical data outside the U.S. is d606 1 a606 1 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D d809 1 a809 1 # as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific d967 1 a967 1 # no information d1150 1 a1150 1 Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan d1152 1 a1152 1 -4:00 1:00 ADT 1945 Sep 30 2:00 d1186 6 a1191 1 # Virgin Is (British and US) d1193 1 a1193 1 Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie @ 1.3 log @sync with tzdata95b @ text @d1 1 a1 1 # @@(#)northamerica 7.15 d196 1 a196 1 # no information; probably like US/Eastern d467 1 a467 1 Rule Winn 1937 only - Sep 23 2:00 0 S d473 5 a477 3 Rule Winn 1947 1958 - Sep lastSun 2:00 0 S Rule Winn 1948 only - May 1 2:00 1:00 D Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D d481 1 a481 1 Rule Winn 1963 only - Sep lastSun 2:00 0 S d483 1 a483 1 Rule Winn 1966 max - Sep lastSun 2:00 0 S @ 1.2 log @updates to timezone files from Arthur David Olson more updates are in the works; i'm doing this in chunks. @ text @d1 11 a11 1 # @@(#)northamerica 7.3 d48 1 a48 1 # old new d114 5 d123 7 a129 6 # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] Zone US/Eastern -5:00 US E%sT Zone US/Central -6:00 US C%sT Zone US/Mountain -7:00 US M%sT Zone US/Pacific -8:00 US P%sT Zone US/Alaska -9:00 US AK%sT # Abbreviation per USNO d133 2 a134 2 Zone US/East-Indiana -5:00 US E%sT 1946 -5:00 - EST # Always EST as of 1986 d139 4 a142 4 Zone US/Indiana-Starke -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST # Always EST as of 1991 Zone US/Arizona -7:00 US M%sT 1946 -7:00 - MST # Always MST as of 1986 d151 1 a151 1 Link US/Mountain Navajo d156 3 a158 3 Zone US/Michigan -5:00 US E%sT 1968 -5:00 - EST 1973 -5:00 US E%sT d161 17 a177 4 Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa d181 2 a182 2 Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30 -10:00 US HA%sT d190 3 a192 3 Zone US/Hawaii -10:30 US H%sT 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 1 2:00 -10:30 US H%sT 1947 Jun 8 2:00 d195 4 d201 8 a208 8 # Link LINK-FROM LINK-TO # Link US/Eastern EST5EDT # Link US/Central CST6CDT # Link US/Mountain MST7MDT # Link US/Pacific PST8PDT # Link US/East-Indiana EST # Link US/Arizona MST # Link US/Hawaii HST d212 20 d268 1 a268 2 # be same as Pacific. Stick with rules posted in 1988 until more authoritative # information is available. d275 1 a275 1 # d280 1 a280 1 # d288 1 a288 1 # d295 1 a295 1 # d306 74 d381 182 a562 15 Rule Canada 1969 max - Oct lastSun 2:00 0 S Rule Canada 1969 1986 - Apr lastSun 2:00 1:00 D Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] # Bob Devine says that DST *is* observed in Newfoundland Zone Canada/Newfoundland -3:30 Canada N%sT Zone Canada/Atlantic -4:00 Canada A%sT Zone Canada/Eastern -5:00 Canada E%sT Zone Canada/Central -6:00 Canada C%sT Zone Canada/East-Saskatchewan -6:00 - CST # see above Zone Canada/Saskatchewan -6:00 - CST # see above Zone Canada/Mountain -7:00 Canada M%sT Zone Canada/Pacific -8:00 Canada P%sT Zone Canada/Yukon -9:00 Canada Y%sT a613 1 # Wait for more authoritative information before changing. d615 5 d621 46 a666 7 Rule Mexico 1987 max - Oct lastSun 2:00 0 S Rule Mexico 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] Zone Mexico/BajaNorte -8:00 Mexico P%sT Zone Mexico/BajaSur -7:00 - MST Zone Mexico/General -6:00 - CST d670 10 a679 1 # Jamaica d681 9 a689 2 # From Bob Devine (January 28, 1988): # Follows US rules. d691 12 a702 2 # From U. S. Naval Observatory (January 19, 1989): # JAMAICA 5 H BEHIND UTC d704 45 a748 3 Link US/Eastern Jamaica ############################################################################### d761 1 d763 20 d784 1 a784 2 Rule Cuba 1979 1980 - Oct Sun>=8 0:00 0 S Rule Cuba 1981 max - May Sun>=8 0:00 1:00 D d786 13 d800 154 a953 2 # Zone NAME GMTOFF RULES/SAVE FORMAT Zone Cuba -5:00 Cuba C%sT @ 1.1 log @Initial revision @ text @d1 1 a1 1 # @@(#)northamerica 4.8 d43 1 a43 1 # d119 6 d218 36 d265 2 a266 1 Zone Canada/East-Saskatchewan -6:00 - CST # No DST as of 1987 d286 1 a286 1 # d290 1 a290 1 # @ 1.1.1.1 log @initial import of 386bsd-0.1 sources @ text @@ 1.1.1.2 log @updated timezone files from ado @ text @d1 1 a1 11 # @@(#)northamerica 7.15 # also includes Central America and the Caribbean # This data is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz@@elsie.nci.nih.gov for general use in the future). # From Paul Eggert (August 17, 1994): # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and the discovery of the longitude, # Oxford University Press (1980). d38 1 a38 1 # old new d43 1 a43 1 # a103 5 # From Paul Eggert (August 16, 1994): # Howse writes that Alaska switched from the Julian to the Gregorian calendar, # and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it # from Russia. We don't have this data pinned down yet, though. d108 6 a113 7 # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/New_York -5:00 US E%sT Zone America/Chicago -6:00 US C%sT Zone America/Denver -7:00 US M%sT Zone America/Los_Angeles -8:00 US P%sT Zone America/Anchorage -9:00 US AK%sT # AK%sT is the abbreviation per USNO d117 4 a120 10 Zone America/Fort_Wayne -5:00 US E%sT 1946 -5:00 - EST # Always EST as of 1986 # From Arthur David Olson (October 28, 1991): # An article on page A3 of the Sunday, October 27, 1991 Washington Post # notes that Starke County switched from Central time to Eastern time as of # October 27, 1991. Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST # Always EST as of 1991 Zone America/Phoenix -7:00 US M%sT 1946 -7:00 - MST # Always MST as of 1986 d129 1 a129 1 Link America/Denver America/Shiprock d134 3 a136 3 Zone America/Detroit -5:00 US E%sT 1968 -5:00 - EST 1973 -5:00 US E%sT d139 4 a142 17 # # Howse writes that in 1879 the King of Samoa decided to change # ``the date in his kingdom from the Antipodean to the American system, # ordaining -- by a masterpiece of diplomatic flattery -- that # the Fourth of July should be celebrated twice in that year.'' Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5 -11:22:48 - LMT 1911 -11:30 - SST 1950 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa Zone Pacific/Midway -11:49:28 - LMT 1901 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa d146 2 a147 2 Zone America/Atka -10:00 US AH%sT 1983 Nov 30 -10:00 US HA%sT d155 3 a157 3 Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 1 2:00 -10:30 US H%sT 1947 Jun 8 2:00 a159 4 # Navassa # no information; probably like US/Eastern d162 8 a169 8 # Link LINK-FROM LINK-TO Link America/New_York EST5EDT Link America/Chicago CST6CDT Link America/Denver MST7MDT Link America/Los_Angeles PST8PDT Link America/Fort_Wayne EST Link America/Phoenix MST Link Pacific/Honolulu HST a172 20 # From Paul Eggert (November 18, 1993): # A good source for time zone historical data outside the U.S. is # Thomas G. Shanks, The International Atlas (3rd edition), # San Diego: ACS Publications, Inc. (1991). # Except where otherwise noted, it is the source for the data below. # # Another source occasionally used is Edward W. Whitman, World Time Differences, # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which # I found in the UCLA library. # # I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. # Corrections are welcome! # # See the `europe' file for Greenland. # # See the `africa' file for Zone naming conventions. d209 2 a210 71 # be same as Pacific. # From W. Jones (jones@@skdad.usask.ca) (November 6, 1992): # The. . .below is based on information I got from our law library, the # provincial archives, and the provincial Community Services department. # A precise history would require digging through newspaper archives, and # since you didn't say what you wanted, I didn't bother. # # Saskatchewan is split by a time zone meridian (105W) and over the years # the boundary became pretty ragged as communities near it reevaluated # their affiliations in one direction or the other. In 1965 a provincial # referendum favoured legislating common time practices. # # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of # Saskatchewan 1978) was proclaimed, and established that the eastern # part of Saskatchewan would use CST year round, that districts in # northwest Saskatchewan would by default follow CST but could opt to # follow Mountain Time rules (thus 1 hour difference in the winter and # zero in the summer), and that districts in southwest Saskatchewan would # by default follow MT but could opt to follow CST. # # It took a few years for the dust to settle (I know one story of a town # on one time zone having its school in another, such that a mom had to # serve her family lunch in two shifts), but presently it seems that only # a few towns on the border with Alberta (e.g. Lloydminster) follow MT # rules any more; all other districts appear to have used CST year round # since sometime in the 1960s. # # Here's how I would summarize things. Establish a "Saskatchewan" CST # time zone, and note that it officially exists as of 15 April 1966. Any # current exceptions can put themselves in the "Mountain" zone, since # those are the rules they follow. Any past exceptions can be forgotten, # since that's what those who live here have done. # From Arthur David Olson (November 21, 1992): # East-Saskatchewan kept to avoid problems for folks using that zone by name; # plain Saskatchewan added. # From Alain LaBont (1994-11-14): # I post here the time zone abbreviations standardized in Canada # for both English and French in the CAN/CSA-Z234.4-89 standard.... # # UTC Standard time Daylight savings time # offset French English French English # -2:30 - - HAT NDT # -3 - - HAA ADT # -3:30 HNT NST - - # -4 HNA AST HAE EDT # -5 HNE EST HAC CDT # -6 HNC CST HAR MDT # -7 HNR MST HAP PDT # -8 HNP PST HAY YDT # -9 HNY YST - - # # HN: Heure Normale ST: Standard Time # HA: Heure Avance DT: Daylight saving Time # # A: de l'Atlantique Atlantic # C: du Centre Central # E: de l'Est Eastern # M: Mountain # N: Newfoundland # P: du Pacifique Pacific # R: des Rocheuses # T: de Terre-Neuve # Y: du Yukon Yukon # # From Paul Eggert (1994-11-22): # Alas, this sort of thing must be handled by localization software. a211 1 # From Shanks (1991): d213 14 a226 221 Rule StJohns 1884 only - Jan 1 0:00 0 S Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D Rule StJohns 1917 only - Sep 17 2:00 0 S Rule StJohns 1918 only - Oct 31 2:00 0 S # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. Rule StJohns 1919 only - May 5 23:00 1:00 D Rule StJohns 1919 only - Aug 12 23:00 0 S # For 1931-1935 Whitman gives Apr same date; go with Shanks. Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. Rule StJohns 1942 only - Mar 1 0:00 1:00 D Rule StJohns 1942 only - Dec 31 0:00 0 S Rule StJohns 1943 only - May 30 0:00 1:00 D Rule StJohns 1943 only - Sep 5 0:00 0 S Rule StJohns 1944 only - Jul 10 0:00 1:00 D Rule StJohns 1944 only - Sep 2 0:00 0 S Rule StJohns 1945 only - Jan 1 0:00 1:00 D Rule StJohns 1945 only - Oct 7 2:00 0 S # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives # Apr 30 - Sep 24; go with Shanks. Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S Rule StJohns 1960 max - Oct lastSun 2:00 0 S Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D # St John's has an apostrophe, but Posix file names can't have apostrophes. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Johns -3:30:52 - LMT 1884 -3:31 StJohns N%sT 1935 Mar 30 -3:30 StJohns N%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Halifax 1902 only - Jun 15 0:00 0 S Rule Halifax 1916 only - Apr 1 0:00 1:00 D Rule Halifax 1916 only - Oct 1 0:00 0 S Rule Halifax 1918 only - Apr 14 2:00 1:00 D Rule Halifax 1918 only - Oct 31 2:00 0 S Rule Halifax 1920 only - May 9 0:00 1:00 D Rule Halifax 1920 only - Aug 29 0:00 0 S Rule Halifax 1921 only - May 6 0:00 1:00 D Rule Halifax 1921 1922 - Sep 5 0:00 0 S Rule Halifax 1922 only - Apr 30 0:00 1:00 D Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D Rule Halifax 1923 only - Sep 4 0:00 0 S Rule Halifax 1924 only - Sep 15 0:00 0 S Rule Halifax 1925 only - Sep 28 0:00 0 S Rule Halifax 1926 only - May 16 0:00 1:00 D Rule Halifax 1926 only - Sep 13 0:00 0 S Rule Halifax 1927 only - May 1 0:00 1:00 D Rule Halifax 1927 only - Sep 26 0:00 0 S Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D Rule Halifax 1928 only - Sep 9 0:00 0 S Rule Halifax 1929 only - Sep 3 0:00 0 S Rule Halifax 1930 only - Sep 15 0:00 0 S Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S Rule Halifax 1933 only - Apr 30 0:00 1:00 D Rule Halifax 1933 only - Oct 2 0:00 0 S Rule Halifax 1934 only - May 20 0:00 1:00 D Rule Halifax 1934 only - Sep 16 0:00 0 S Rule Halifax 1935 only - Jun 2 0:00 1:00 D Rule Halifax 1935 only - Sep 30 0:00 0 S Rule Halifax 1936 only - Jun 1 0:00 1:00 D Rule Halifax 1936 only - Sep 14 0:00 0 S Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S Rule Halifax 1939 only - May 28 0:00 1:00 D Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D Rule Halifax 1942 only - Feb 9 2:00 1:00 D Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D Rule Halifax 1962 max - Oct lastSun 2:00 0 S Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 -4:00 Halifax A%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mont 1884 only - Jan 1 0:00 0 S Rule Mont 1917 only - Mar 25 2:00 1:00 D Rule Mont 1917 only - Apr 24 0:00 0 S Rule Mont 1918 only - Apr 14 2:00 1:00 D Rule Mont 1918 only - Oct 31 2:00 0 S Rule Mont 1919 only - Mar 31 2:30 1:00 D Rule Mont 1919 only - Oct 25 2:30 0 S Rule Mont 1920 only - May 2 2:30 1:00 D Rule Mont 1920 only - Oct 3 2:30 0 S Rule Mont 1921 only - May 1 2:00 1:00 D Rule Mont 1921 only - Oct 2 2:30 0 S Rule Mont 1922 only - Apr 30 2:00 1:00 D Rule Mont 1922 only - Oct 1 2:30 0 S Rule Mont 1924 only - May 17 2:00 1:00 D Rule Mont 1924 1926 - Sep lastSun 2:30 0 S Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D Rule Mont 1927 only - May 1 0:00 1:00 D Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D Rule Mont 1932 only - May 1 0:00 1:00 D Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D Rule Mont 1933 only - Oct 1 0:00 0 S Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S Rule Mont 1945 1948 - Sep lastSun 2:00 0 S Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D Rule Mont 1949 1950 - Oct lastSun 2:00 0 S Rule Mont 1951 1956 - Sep lastSun 2:00 0 S Rule Mont 1957 max - Oct lastSun 2:00 0 S Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Montreal -4:54:16 - LMT 1884 -5:00 Mont E%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Winn 1887 only - Jul 16 0:00 0 S Rule Winn 1916 only - Apr 23 0:00 1:00 D Rule Winn 1916 only - Sep 17 0:00 0 S Rule Winn 1918 only - Apr 14 2:00 1:00 D Rule Winn 1918 only - Oct 31 2:00 0 S Rule Winn 1937 only - May 16 2:00 1:00 D Rule Winn 1937 only - Sep 23 2:00 0 S Rule Winn 1942 only - Feb 9 2:00 1:00 D Rule Winn 1945 only - Sep lastSun 2:00 0 S Rule Winn 1946 only - May 12 2:00 1:00 D Rule Winn 1946 only - Oct 13 2:00 0 S Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D Rule Winn 1947 1958 - Sep lastSun 2:00 0 S Rule Winn 1948 only - May 1 2:00 1:00 D Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D Rule Winn 1959 only - Oct lastSun 2:00 0 S Rule Winn 1960 only - Sep lastSun 2:00 0 S Rule Winn 1963 only - Apr lastSun 2:00 1:00 D Rule Winn 1963 only - Sep lastSun 2:00 0 S Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D Rule Winn 1966 max - Sep lastSun 2:00 0 S Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 -6:00 Winn C%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Regina 1905 only - Sep 1 0:00 0 S Rule Regina 1918 only - Apr 14 2:00 1:00 D Rule Regina 1918 only - Oct 31 2:00 0 S Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D Rule Regina 1937 only - Oct Sun>=8 0:00 0 S Rule Regina 1938 only - Oct Sun>=1 0:00 0 S Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S Rule Regina 1942 only - Feb 9 2:00 1:00 D Rule Regina 1945 only - Sep lastSun 2:00 0 S Rule Regina 1946 only - Apr 14 2:00 1:00 D Rule Regina 1946 only - Oct 13 2:00 0 S Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D Rule Regina 1947 1959 - Sep lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Regina -6:58:36 - LMT 1905 Sep -7:00 Regina M%sT 1966 Apr 15 -6:00 - CST # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Edm 1906 only - Sep 1 0:00 0 S Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D Rule Edm 1918 only - Oct 31 2:00 0 S Rule Edm 1919 only - May 27 2:00 0 S Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D Rule Edm 1920 only - Oct lastSun 2:00 0 S Rule Edm 1921 1923 - Sep lastSun 2:00 0 S Rule Edm 1942 only - Feb 9 2:00 1:00 D Rule Edm 1945 only - Sep lastSun 2:00 0 S Rule Edm 1947 only - Apr lastSun 2:00 1:00 D Rule Edm 1947 only - Sep lastSun 2:00 0 S Rule Edm 1967 only - Apr lastSun 2:00 1:00 D Rule Edm 1967 only - Oct lastSun 2:00 0 S Rule Edm 1969 only - Apr lastSun 2:00 1:00 D Rule Edm 1969 only - Oct lastSun 2:00 0 S Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D Rule Edm 1972 max - Oct lastSun 2:00 0 S Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Edmonton -7:33:52 - LMT 1906 Sep -7:00 Edm M%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Vanc 1884 only - Jan 1 0:00 0 S Rule Vanc 1918 only - Apr 14 2:00 1:00 D Rule Vanc 1918 only - Oct 31 2:00 0 S Rule Vanc 1942 only - Feb 9 2:00 1:00 D Rule Vanc 1945 only - Sep 30 2:00 0 S Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D Rule Vanc 1946 only - Oct 13 2:00 0 S Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S Rule Vanc 1962 max - Oct lastSun 2:00 0 S Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Vancouver -8:12:28 - LMT 1884 -8:00 Vanc P%sT # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Yukon 1900 only - Jan 1 0:00 0 S Rule Yukon 1918 only - Apr 14 2:00 1:00 D Rule Yukon 1918 only - Oct 27 2:00 0 S Rule Yukon 1919 only - May 25 2:00 1:00 D Rule Yukon 1919 only - Nov 1 0:00 0 S Rule Yukon 1942 only - Feb 9 2:00 1:00 D Rule Yukon 1965 only - Apr 25 0:00 1:00 D Rule Yukon 1965 only - Oct 31 2:00 0 S Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D Rule Yukon 1980 max - Oct lastSun 2:00 0 S Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 -9:00 Yukon Y%sT 1966 Jul -8:00 Yukon P%sT # Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. d243 1 a243 1 # d247 1 a247 1 # d278 1 d280 3 a282 3 # From Paul Eggert (November 18, 1993): # Shanks also says there are four zones, but disagrees about the fourth. # Instead of GMT-6 with DST, he says there's GMT-8 without DST. d284 4 a287 48 # From Shanks (1991): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mexico 1922 only - Jan 1 0:00 0 S Rule Mexico 1939 only - Feb 5 0:00 1:00 D Rule Mexico 1939 only - Jun 25 0:00 0 S Rule Mexico 1940 only - Dec 9 0:00 1:00 D Rule Mexico 1941 only - Apr 1 0:00 0 S Rule Mexico 1943 only - Dec 16 0:00 1:00 D Rule Mexico 1944 only - May 1 0:00 0 S Rule Mexico 1950 only - Feb 12 0:00 1:00 D Rule Mexico 1950 only - Jul 30 0:00 0 S Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 -6:00 Mexico C%sT Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 -6:00 - CST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 - MST Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 -8:00 - PST 1927 Jun 10 23:00 -7:00 - MST 1930 Nov 16 -8:00 - PST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 -8:00 US P%sT Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 -8:00 - PST 1927 Jun 10 23:00 -7:00 - MST 1930 Nov 16 -8:00 - PST 1942 Apr -7:00 - MST 1949 Jan 14 -8:00 - PST # # Revillagigedo Is # no information d291 1 a291 10 # Anguilla # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 -4:00 - AST # Antigua and Barbuda # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 -5:00 - EST 1951 -4:00 - AST d293 5 a297 9 # Bahamas # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Bahamas 1912 only - Mar 2 0:00 0 S Rule Bahamas 1964 max - Oct lastSun 2:00 0 S Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 -5:00 Bahamas E%sT d299 1 a299 12 # Barbados # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Barb 1932 only - Jan 1 0:00 0 S Rule Barb 1977 only - Jun 12 2:00 1:00 D Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D Rule Barb 1979 only - Sep 30 2:00 0 S Rule Barb 1980 only - Sep 25 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown -3:58 - BMT 1932 # Bridgetown Mean Time -4:00 Barb A%sT d301 1 a301 45 # Belize # Whitman entirely disagrees with Shanks; go with Shanks. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Belize 1912 only - Apr 1 0:00 0 S Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S Rule Belize 1973 only - Dec 5 0:00 1:00 D Rule Belize 1974 only - Feb 9 0:00 0 S Rule Belize 1982 only - Dec 18 0:00 1:00 D Rule Belize 1983 only - Feb 12 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Belize -5:52:48 - LMT 1912 Apr -6:00 Belize C%sT # Bermuda # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton -4:00 - AST 1974 Apr 28 2:00 -4:00 Bahamas A%sT # Cayman Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST # Clipperton # no information # Costa Rica # Shanks gives some very odd dates for 1991, and stops there. # For now, we won't guess further. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule CR 1921 only - Jan 15 0:00 0 S Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S Rule CR 1991 only - Jan 19 0:00 1:00 D Rule CR 1991 only - Jul 1 0:00 0 S # There are too many San Joses elsewhere, so we'll use `Costa Rica'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time -6:00 CR C%sT # Coco # no information; probably like America/Costa_Rica a313 1 # From Shanks (1991): a314 20 Rule Cuba 1925 only - Jul 19 12:00 0 S Rule Cuba 1928 only - Jun 10 0:00 1:00 D Rule Cuba 1928 only - Oct 10 0:00 0 S Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S Rule Cuba 1965 only - Jun 1 0:00 1:00 D Rule Cuba 1965 only - Sep 30 0:00 0 S Rule Cuba 1966 only - May 29 0:00 1:00 D Rule Cuba 1966 only - Oct 2 0:00 0 S Rule Cuba 1967 only - Apr 8 0:00 1:00 D Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S Rule Cuba 1968 only - Apr 14 0:00 1:00 D Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S Rule Cuba 1972 1974 - Oct 8 0:00 0 S Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S Rule Cuba 1978 only - May 7 0:00 1:00 D Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S d316 2 a317 1 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D a318 48 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D Rule Cuba 1990 only - Apr 1 0:00 1:00 D Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Havana -5:29:28 - LMT 1890 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT -5:00 Cuba C%sT # Dominica # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau -4:00 - AST # Dominican Republic # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule DR 1933 only - Apr 1 12:00 0 S Rule DR 1966 only - Oct 30 0:00 1:00 D Rule DR 1967 only - Feb 28 0:00 0 S Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD Rule DR 1970 only - Feb 21 0:00 0 S Rule DR 1971 only - Jan 20 0:00 0 S Rule DR 1972 1974 - Jan 21 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Santo_Domingo -4:39:36 - LMT 1890 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT -5:00 DR E%sT 1974 Oct 27 -4:00 - AST # El Salvador # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Salv 1921 only - Jan 1 0:00 0 S Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D Rule Salv 1987 1988 - Sep lastSun 0:00 0 S # There are too many San Salvadors elsewhere, so we'll use `El Salvador'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador -6:00 Salv C%sT # Grenada # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grenada -4:07:00 - LMT 1911 Jul -4:00 - AST # Guadeloupe # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre -4:00 - AST d320 2 a321 119 # Guatemala # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Guat 1918 only - Oct 5 0:00 0 S Rule Guat 1973 only - Nov 25 0:00 1:00 D Rule Guat 1974 only - Feb 24 0:00 0 S Rule Guat 1983 only - May 21 0:00 1:00 D Rule Guat 1983 only - Sep 22 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 -6:00 Guat C%sT # Haiti # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Haiti 1917 only - Jan 24 12:00 0 S Rule Haiti 1983 only - May 8 0:00 1:00 D Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D Rule Haiti 1988 max - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Port-au-Prince -4:49:20 - LMT 1890 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT -5:00 Haiti E%sT # Honduras # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr -6:00 Salv C%sT # Jamaica # From Bob Devine (January 28, 1988): # Follows US rules. # From U. S. Naval Observatory (January 19, 1989): # JAMAICA 5 H BEHIND UTC # From Shanks (1991): # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST 1974 Jan 6 2:00 -5:00 US E%sT # Martinique # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France -4:04 - FFMT 1911 May # Fort-de-France MT -4:00 - AST 1980 Apr 6 -4:00 1:00 ADT 1980 Sep 28 -4:00 - AST # Montserrat # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth -4:00 - AST # Nicaragua # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Nic 1975 only - Feb 16 0:00 0 S Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Managua -5:45:08 - LMT 1890 -5:45 - MMT 1934 Jun 23 # Managua Mean Time -6:00 - CST 1973 May -5:00 - EST 1975 Feb 16 -6:00 Nic C%sT # Panama # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Panama -5:18:08 - LMT 1890 -5:20 - PMT 1908 Apr 22 # Panama Mean Time -5:00 - EST # Puerto Rico # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan -4:00 - AST 1942 May 3 -4:00 1:00 ADT 1945 Sep 30 2:00 -4:00 - AST # St Kitts-Nevis # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre -4:00 - AST # St Lucia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries -4:04 - CMT 1912 # Castries Mean Time -4:00 - AST # St Pierre and Miquelon # There are too many St Pierres elsewhere, so we'll use `Miquelon'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre -4:00 - AST 1980 May -3:00 Mont SP%sT # St Vincent and the Grenadines # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown -4:05 - KMT 1912 # Kingstown Mean Time -4:00 - AST # Turks and Caicos # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST 1979 Apr 29 2:00 -5:00 US E%sT # Virgin Is (British and US) # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie -4:00 - AST @ 1.1.1.3 log @updated to tzdata95i @ text @d1 1 a1 1 # @@(#)northamerica 7.17 d196 1 a196 1 # no information; probably like America/New_York d467 1 a467 1 Rule Winn 1937 only - Sep 26 2:00 0 S d473 3 a475 5 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S Rule Winn 1950 only - May 1 2:00 1:00 D Rule Winn 1950 only - Sep 30 2:00 0 S Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D Rule Winn 1951 1958 - Sep lastSun 2:00 0 S d479 1 a479 1 Rule Winn 1963 only - Sep 22 2:00 0 S d481 1 a481 1 Rule Winn 1966 max - Oct lastSun 2:00 0 S @ 1.1.1.4 log @import tzdata96a @ text @d1 1 a1 1 # @@(#)northamerica 7.21 a16 7 # From Paul Eggert (1995-12-19): # A good source for time zone historical data in the US is # Thomas G. Shanks, The American Atlas (5th edition), # San Diego: ACS Publications, Inc. (1991). # Make sure you have the errata sheet; the book is somewhat useless without it. # It is the source for the US and Puerto Rico entries below. d22 8 d35 1 a35 1 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War a57 4 # From Paul Eggert (1995-12-19): # The tables below use `NST', not `NT', for Nome Standard Time. # I invented `CAWT' for Central Alaska War Time. a112 19 # # From Paul Eggert (1995-12-19): # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. # Go with Shanks. # US Eastern time, represented by New York # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule NYC 1920 only - Mar lastSun 2:00 1:00 D Rule NYC 1920 only - Oct lastSun 2:00 0 S Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D Rule NYC 1921 1954 - Sep lastSun 2:00 0 S Rule NYC 1955 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 -5:00 US E%sT 1920 -5:00 NYC E%sT 1942 -5:00 US E%sT 1946 -5:00 NYC E%sT 1967 -5:00 US E%sT d114 1 a114 50 # US Central time, represented by Chicago # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Chicago 1920 only - Jun 13 2:00 1:00 D Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1920 -6:00 Chicago C%sT 1936 Mar 1 2:00 -5:00 - EST 1936 Nov 15 2:00 -6:00 Chicago C%sT 1942 -6:00 US C%sT 1946 -6:00 Chicago C%sT 1967 -6:00 US C%sT # US Mountain time, represented by Denver # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D Rule Denver 1920 only - Oct lastSun 2:00 0 S Rule Denver 1921 only - May 22 2:00 0 S Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D Rule Denver 1965 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 -7:00 US E%sT 1920 -7:00 Denver E%sT 1942 -7:00 US E%sT 1946 -7:00 Denver E%sT 1967 -7:00 US E%sT # US Pacific time, represented by Los Angeles # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule CA 1948 only - Mar 14 2:00 1:00 D Rule CA 1949 only - Jan 1 2:00 0 S Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D Rule CA 1950 1961 - Sep lastSun 2:00 0 S Rule CA 1962 1966 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 -8:00 US P%sT 1946 -8:00 CA P%sT 1967 -8:00 US P%sT # Alaska # AK%sT is the modern abbreviation for -9:00 per USNO. # # From Paul Eggert (1995-12-19): d117 6 a122 3 # from Russia. We omit this transition, since we can't represent changes # from Julian to Gregorian. # d124 6 a129 37 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 -8:00 - PST 1969 -8:00 US P%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 -9:00 - YST 1942 -9:00 US Y%sT 1946 -9:00 - YST 1969 -9:00 US Y%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 -10:00 - CAT 1942 -10:00 US CAT/CAWT 1946 -10:00 - CAT 1967 Apr -10:00 - AHST 1969 -10:00 US AH%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -9:00 US AK%sT Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -10:00 US HA%sT # Shanks writes that part of southwest Alaska (e.g. Aniak) # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, # and another part (e.g. Akiak) made the same switch five weeks later. # These switches don't quite make our 1970 cutoff. d131 1 a131 16 # Hawaii # # From Arthur David Olson: # And then there's Hawaii. # DST was observed for one day in 1933; # standard time was changed by half an hour in 1947; # it's always standard as of 1986. # # From Paul Eggert: # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. # Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 -10:30 - HST 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 21 2:00 -10:30 US H%sT 1947 Jun 8 2:00 -10:00 - HST d133 10 a142 6 Zone Pacific/Midway -11:49:28 - LMT 1901 -11:00 - NST 1967 Apr # N=Nome -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa # Now we turn to US areas that have diverged from the consensus since 1970. a143 8 # Arizona mostly uses MST. Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 -7:00 US M%sT 1944 Jan 1 00:01 -7:00 - MST 1944 Mar 17 00:01 -7:00 US M%sT 1944 Oct 1 00:01 -7:00 - MST 1967 -7:00 US M%sT 1968 -7:00 - MST d145 1 a145 1 # A writer from the Inter Tribal Council of Arizona, Inc., d151 1 a151 1 Link America/Denver America/Shiprock d153 6 a158 7 # Southern Idaho and eastern Oregon switched four weeks late in 1974. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 -8:00 US P%sT 1923 May 13 2:00 -7:00 US M%sT 1974 -7:00 - MST 1974 Feb 3 2:00 -7:00 US M%sT d160 1 a160 1 # Indiana d162 21 a182 79 # From Paul Eggert (1995-12-19): # Indiana generally observes either EST all year, or CST/CDT, # but areas near Cincinnati and Louisville use those cities' timekeeping # and in 1969 and 1970 the whole state observed daylight time; # and there are other exceptions as noted below. # Shanks partitions Indiana into 345 regions, each with its own time history, # and writes ``Even newspaper reports present contradictory information.'' # Fortunately, most of the complexity occurred before our cutoff date of 1970. # # Since 1970, EST-only Indiana has been like America/Indianapolis, # with exceptions noted below for Crawford, Starke, and Switzerland counties. # The parts of Indiana not listed below have been like America/Chicago, # America/Louisville, or America/New_York. # # Other than Indianapolis, the Indiana place names are so nondescript # that they would be ambiguous if we left them at the `America' level. # So we reluctantly put them all in a subdirectory `America/Indiana'. # # Most of EST-only Indiana last observed DST in 1970. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1920 -6:00 Indianapolis C%sT 1942 -6:00 US C%sT 1946 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 -5:00 - EST 1957 Sep 29 2:00 -6:00 - CST 1958 Apr 27 2:00 -5:00 - EST 1969 -5:00 US E%sT 1971 -5:00 - EST Link America/Indianapolis America/Indiana/Indianapolis # # Part of Crawford County, Indiana, last observed DST in 1975, # and left its clocks alone in 1974. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D Rule Marengo 1951 only - Sep lastSun 2:00 0 S Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1951 -6:00 Marengo C%sT 1961 Apr 30 2:00 -5:00 - EST 1969 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT 1976 -5:00 - EST # # Starke County, Indiana # From Arthur David Olson (October 28, 1991): # An article on page A3 of the Sunday, October 27, 1991 Washington Post # notes that Starke County switched from Central time to Eastern time as of # October 27, 1991. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D Rule Starke 1947 1954 - Sep lastSun 2:00 0 S Rule Starke 1955 1956 - Oct lastSun 2:00 0 S Rule Starke 1957 1958 - Sep lastSun 2:00 0 S Rule Starke 1959 1961 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1947 -6:00 Starke C%sT 1962 Apr 29 2:00 -5:00 - EST 1963 Oct 27 2:00 -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST # # Switzerland County, Indiana, last observed DST in 1972. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1954 Apr 25 2:00 -5:00 - EST 1969 -5:00 US E%sT 1973 -5:00 - EST d184 5 a188 19 # Part of Kentucky left its clocks alone in 1974. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Louisville 1921 only - May 1 2:00 1:00 D Rule Louisville 1921 only - Sep 1 2:00 0 S Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D Rule Louisville 1941 only - Sep lastSun 2:00 0 S Rule Louisville 1946 only - Jun 2 2:00 0 S Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1921 -6:00 Louisville C%sT 1942 -6:00 US C%sT 1946 -6:00 Louisville C%sT 1961 Jul 23 2:00 -5:00 - EST 1968 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT d190 4 a193 47 # Michigan # # From Bob Devine (January 28, 1988): # Michigan didn't observe DST from 1968 to 1973. # # From Paul Eggert (1995-12-19): # Shanks writes that Michigan started using standard time on 1885 Sep 18, # but Howse (p 126) writes that Detroit kept # # local time until 1900 when the City Council decreed that clocks should # be put back twenty-eight minutes to Central Standard Time. Half the # city obeyed, half refused. After considerable debate, the decision # was rescinded and the city reverted to Sun time. A derisive offer to # erect a sundial in front of the city hall was referred to the # Committee on Sewers. Then, in 1905, Central time was adopted # by city vote. # # This story is too entertaining to be false, so go with Howse over Shanks. # # Most of Michigan observed DST from 1973 on, but was a bit late in 1975. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D Rule Detroit 1948 only - Sep lastSun 2:00 0 S Rule Detroit 1967 only - Jun 14 2:00 1:00 D Rule Detroit 1967 only - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Detroit -5:32:11 - LMT 1905 -6:00 - CST 1915 May 15 2:00 -5:00 - EST 1942 -5:00 US E%sT 1946 -5:00 Detroit E%sT 1973 -5:00 US E%sT 1975 -5:00 - EST 1975 Apr 27 2:00 -5:00 US E%sT # # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D Rule Menominee 1946 only - Sep lastSun 2:00 0 S Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D Rule Menominee 1966 only - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 -6:00 US C%sT 1946 -6:00 Menominee C%sT 1969 Apr 27 2:00 -5:00 - EST 1973 Apr 29 2:00 -6:00 US C%sT d196 1 a196 1 # uninhabited d206 1 a206 1 Link America/Indianapolis EST d214 1 a214 1 # A good source for time zone historical data outside the US is d372 1 a372 1 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD d575 1 a575 1 # as listed there; [there is also] "Baja California Sur and N. Pacific d733 1 a733 1 # uninhabited d916 1 a916 1 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan d918 1 a918 1 -4:00 1:00 AWT 1945 Sep 30 2:00 d952 1 a952 6 # British Virgin Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town -4:00 - AST # Virgin Is d954 1 a954 1 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie @ 1.1.1.5 log @import tzdata96d @ text @d1 1 a1 1 # @@(#)northamerica 7.22 a854 9 # From Paul Eggert (1996-02-07): # Today in news:4f90v4$g6g@@news.internet.com.mx, Kevin Pitts # wrote that Mexico will use Horario de Verano (DST) # starting this year with the same rules as the US, and gave FIDE as a source. # (FIDE is a private organization that promotes efficient electrical use.) # On 1996-02-02 Mario Camou wrote that the transition times are Apr Sun>=1 # 0:00 and Nov 1 0:00 but also wrote ``The DST-out date looks a bit fishy''. # Go with Pitts after 1996, and with Shanks before that. a865 3 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D Rule Mexico 1996 max - Oct lastSun 2:00 0 S # d886 1 a886 1 -7:00 Mexico M%sT d893 1 a893 2 -8:00 US P%sT 1996 -8:00 Mexico P%sT d899 1 a899 2 -8:00 - PST 1996 -8:00 Mexico P%sT @ 1.1.1.6 log @import tzdata96h @ text @d1 1 a1 1 # @@(#)northamerica 7.25 d163 5 a167 5 -7:00 US M%sT 1920 -7:00 Denver M%sT 1942 -7:00 US M%sT 1946 -7:00 Denver M%sT 1967 -7:00 US M%sT d464 2 d572 2 d576 1 d615 1 d661 1 d695 1 d724 1 d745 1 d768 1 d783 1 d851 1 a851 1 # From Paul Eggert (1993-11-18): d855 8 a862 28 # From Alan Perry (1996-02-15): # A guy from our Mexico subsidiary finally found the Presidential Decree # outlining the timezone changes in Mexico. # # ------------- Begin Forwarded Message ------------- # # I finally got my hands on the Official Presidential Decree that sets up the # rules for the DST changes. The rules are: # # 1. The country is divided in 3 timezones: # - Baja California Norte (the Mexico/BajaNorte TZ) # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) # - The rest of the country (the Mexico/General TZ) # # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October # at 2:00 AM, the times in each zone are as follows: # BajaNorte: GMT+7 # BajaSur: GMT+6 # General: GMT+5 # # 3. The rest of the year, the times are as follows: # BajaNorte: GMT+8 # BajaSur: GMT+7 # General: GMT+6 # # The Decree was published in Mexico's Official Newspaper on January 4th. # # -------------- End Forwarded Message -------------- d866 1 d933 1 d943 1 d957 1 d987 1 d1013 1 d1052 1 d1067 1 d1087 1 d1098 1 d1145 1 @ 1.1.1.7 log @import tzdata96k @ text @d1 1 a1 1 # @@(#)northamerica 7.27 a23 18 # From Paul Eggert (1996-06-12): # Daylight Saving Time was first suggested as a joke by Benjamin Franklin # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). # Not everyone is happy with the results: # # I don't really care how time is reckoned so long as there is some # agreement about it, but I object to being told that I am saving # daylight when my reason tells me that I am doing nothing of the kind. # I even object to the implication that I am wasting something # valuable if I stay in bed after the sun has risen. As an admirer # of moonlight I resent the bossy insistence of those who want to # reduce my time for enjoying it. At the back of the Daylight Saving # scheme I detect the bony, blue-fingered hand of Puritanism, eager # to push people into bed earlier, and get them up earlier, to make # them healthy, wealthy and wise in spite of themselves. # # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday d187 3 a189 3 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. # This was on 1867-10-18. We omit this transition, since we can't represent # changes from Julian to Gregorian. d457 3 d462 1 a462 1 # See the `africa' file for time zone naming and abbreviation conventions. d466 72 d570 1 a570 15 # The data for Canada are all from Shanks (1991). # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Canada 1918 only - Apr 14 2:00 1:00 D Rule Canada 1918 only - Oct 31 2:00 0 S Rule Canada 1942 only - Feb 9 2:00 1:00 D Rule Canada 1945 only - Sep 30 2:00 0 S Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D Rule Canada 1974 max - Oct lastSun 2:00 0 S Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D # Newfoundland a608 10 # Labrador, New Brunswick, Nova Scotia, Prince Edward I # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Halifax. # Many locales did not observe peacetime DST until 1972; # Glace Bay, NS is the largest that we know of. # Shanks also writes that Liverpool, NS was the only town in Canada to observe # DST in 1971 but not 1970; for now we'll assume this is a typo. a652 15 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 -4:00 Canada A%sT 1953 -4:00 Halifax A%sT 1954 -4:00 - AST 1972 -4:00 Halifax A%sT # Ontario, Quebec # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Montreal. # Thunder Bay skipped DST in 1973. # Many smaller locales did not observe peacetime DST until 1974; # Nipigon (EST) and Rainy River (CST) are the largest that we know of. # Far west Ontario is like Winnipeg; far east Quebec is like Halifax. a685 12 Zone America/Thunder_Bay -5:57:00 - LMT 1895 -5:00 Canada E%sT 1970 -5:00 Mont E%sT 1973 -5:00 - EST 1974 -5:00 Canada E%sT Zone America/Nipigon -5:53:04 - LMT 1895 -5:00 Canada E%sT Zone America/Rainy_River -6:17:56 - LMT 1895 -6:00 Canada C%sT # Manitoba a714 34 # Saskatchewan # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Regina. # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. # Other western towns (e.g. Lloydminster) are like Edmonton. # From W. Jones (November 6, 1992): # The. . .below is based on information I got from our law library, the # provincial archives, and the provincial Community Services department. # A precise history would require digging through newspaper archives, and # since you didn't say what you wanted, I didn't bother. # # Saskatchewan is split by a time zone meridian (105W) and over the years # the boundary became pretty ragged as communities near it reevaluated # their affiliations in one direction or the other. In 1965 a provincial # referendum favoured legislating common time practices. # # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of # Saskatchewan 1978) was proclaimed, and established that the eastern # part of Saskatchewan would use CST year round, that districts in # northwest Saskatchewan would by default follow CST but could opt to # follow Mountain Time rules (thus 1 hour difference in the winter and # zero in the summer), and that districts in southwest Saskatchewan would # by default follow MT but could opt to follow CST. # # It took a few years for the dust to settle (I know one story of a town # on one time zone having its school in another, such that a mom had to # serve her family lunch in two shifts), but presently it seems that only # a few towns on the border with Alberta (e.g. Lloydminster) follow MT # rules any more; all other districts appear to have used CST year round # since sometime in the 1960s. d726 4 a729 11 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D Rule Regina 1946 only - Oct Sun>=8 2:00 0 S Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D Rule Regina 1947 1958 - Sep lastSun 2:00 0 S Rule Regina 1959 only - Oct lastSun 2:00 0 S # Rule Swift 1957 only - Apr lastSun 2:00 1:00 D Rule Swift 1957 only - Oct lastSun 2:00 0 S Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D Rule Swift 1959 only - Oct lastSun 2:00 0 S Rule Swift 1960 1961 - Sep lastSun 2:00 0 S d731 2 a732 7 Zone America/Regina -6:58:36 - LMT 1905 Sep -7:00 Regina M%sT 1960 Apr lastSun 2:00 -6:00 - CST Zone America/Swift_Current -7:11:20 - LMT 1905 Sep -7:00 Canada M%sT 1946 Apr lastSun 2:00 -7:00 Regina M%sT 1950 -7:00 Swift M%sT 1972 Apr lastSun 2:00 a734 3 # Alberta a756 7 # British Columbia # From Paul Eggert (1996-06-12): # Shanks writes that since 1970 most of this region has been like Vancouver. # Dawswon Creek uses MST. Much of east BC is like Edmonton. a769 11 Zone America/Dawson_Creek -8:00:56 - LMT 1884 -8:00 Canada P%sT 1947 -8:00 Vanc P%sT 1972 Aug 30 2:00 -7:00 - MST # Northwest Territories, Yukon # From Paul Eggert (1996-06-12): # Dawson switched to PST in 1973. Inuvik switched to MST in 1979. # Shanks's table for Watson Lake is corrupted, so we have no data there. d772 11 a782 23 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D Rule NT_YK 1918 only - Oct 27 2:00 0 S Rule NT_YK 1919 only - May 25 2:00 1:00 D Rule NT_YK 1919 only - Nov 1 0:00 0 S Rule NT_YK 1942 only - Feb 9 2:00 1:00 D Rule NT_YK 1945 only - Sep 30 2:00 0 S Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD Rule NT_YK 1965 only - Oct lastSun 2:00 0 S Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D Rule NT_YK 1980 max - Oct lastSun 2:00 0 S Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Pangnirtung -4:22:56 - LMT 1884 -4:00 NT_YK A%sT Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay -5:00 NT_YK E%sT Zone America/Rankin_Inlet -6:08:40 - LMT 1884 -6:00 NT_YK C%sT Zone America/Yellowknife -7:37:24 - LMT 1884 -7:00 NT_YK M%sT Zone America/Inuvik -8:54:00 - LMT 1884 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 -7:00 NT_YK M%sT d784 3 a786 6 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 -8:00 NT_YK P%sT Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 -9:00 NT_YK Y%sT 1973 Oct lastSun 2:00 -8:00 NT_YK P%sT a870 4 # From Paul Eggert (1996-06-12): # For an English translation of the decree, # see ``Diario Oficial: Time Zone Changeover'', # (1996-01-04). d1077 1 a1077 1 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's d1182 1 a1182 1 -3:00 Mont PM%sT # Pierre & Miquelon Time @ 1.1.1.8 log @import tzdata96m @ text @d1 1 a1 1 # @@(#)northamerica 7.29 d8 1 a8 1 # From Paul Eggert (1994-08-17): d44 2 a45 2 # See, for example, the front page of the Saturday, 1974-10-26 # and Sunday, 1974-10-27 editions of the Washington Post. d63 1 a63 1 # From Bob Devine (1988-01-28): d79 1 a79 1 # From U. S. Naval Observatory (1989-01-19): d95 1 a95 1 # From Arthur David Olson (1989-01-21): d101 1 a101 1 # From Arthur David Olson (1988-02-13): d104 1 a104 1 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 d114 1 a114 1 # Next, names from 1967-04-01 until 1983-11-30 (the date for d124 1 a124 1 # And after 1983-11-30: d280 1 a280 1 # From Arthur David Olson (1988-02-13): d353 2 a354 2 # From Arthur David Olson (1991-10-28): # An article on page A3 of the Sunday, 1991-10-27 Washington Post d356 1 a356 1 # 1991-10-27. d401 1 a401 1 # From Bob Devine (1988-01-28): d465 1 a465 1 # From Paul Eggert (1996-11-22): d469 1 a469 9 # # Gwillim Law writes that a good source # for recent time zone data is the International Air Transport # Association's Standard Schedules Information Manual (IATA SSIM), # published semiannually. Law sent in several helpful summaries # of the IATA's data after 1990. # # Except where otherwise noted, Shanks is the source for entries through 1990, # and IATA SSIM is the source for entries after 1990. d526 1 a526 1 # Newfoundland (except Labrador) d563 1 a563 1 -3:30:52 StJohns N%sT 1935 Mar 30 d567 1 a567 13 # east Labrador # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay -3:30:52 StJohns NST 1919 -3:30:52 - NST 1935 Mar 30 -3:30 - NST 1936 -3:30 StJohns N%sT 1966 Mar 15 2:00 -4:00 StJohns A%sT # west Labrador, New Brunswick, Nova Scotia, Prince Edward I d717 1 a717 1 # From W. Jones (1992-11-06): d828 1 a828 1 # From Paul Eggert (1996-10-07): a830 8 # Mathew Englander (1996-10-07) gives the following refs: # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, # c. 7 defines Yukon standard time as UTC-9. This is still valid; # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. # * O.I.C. 1980/02 established DST. # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. d860 1 a860 1 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 d876 1 a876 1 # From Bob Devine (1988-01-28): d887 1 a887 1 # From Arthur David Olson (1988-02-13) d891 1 a891 1 # From U. S. Naval Observatory (1989-01-19): d909 1 a909 1 # From Arthur David Olson (1989-01-21): d1073 2 a1074 4 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. Rule CR 1991 only - Jul 1 0:00 0 S Rule CR 1992 only - Mar 15 0:00 0 S d1085 1 a1085 1 # From Bob Devine (1988-01-28): d1090 1 a1090 1 # From U. S. Naval Observatory (1989-01-19): d1117 1 a1117 1 Rule Cuba 1981 1990 - Oct Sun>=8 0:00 0 S d1119 2 a1120 3 Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S Rule Cuba 1996 max - Oct Sun>=1 0:00s 0 S a1170 2 Rule Guat 1991 only - Mar 23 0:00 1:00 D Rule Guat 1991 only - Sep 7 0:00 0 S d1180 2 a1181 3 # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA. Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D Rule Haiti 1988 max - Oct lastSun 1:00s 0 S d1195 1 a1195 1 # From Bob Devine (1988-01-28): d1198 1 a1198 1 # From U. S. Naval Observatory (1989-01-19): d1206 1 a1206 2 -5:00 US E%sT 1984 -5:00 - EST a1224 2 Rule Nic 1992 only - Jan 1 4:00 1:00 D Rule Nic 1992 only - Sep 24 0:00 0 S d1230 1 a1230 2 -6:00 Nic C%sT 1993 Jan 1 4:00 -5:00 - EST a1270 7 # From Paul Eggert (1996-11-22): # Shanks says they use US DST rules, but IATA SSIM (1991/1996) # says they switch at midnight. Go with IATA SSIM. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D Rule TC 1979 max - Oct lastSun 0:00 0 S Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D d1274 2 a1275 1 -5:00 TC E%sT @ 1.1.1.9 log @import tzdata97d @ text @d1 1 a1 1 # @@(#)northamerica 7.30 d923 1 a923 1 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 d925 1 a925 1 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 @