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Diffstat (limited to 'time/northamerica')
| -rw-r--r-- | time/northamerica | 1345 |
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diff --git a/time/northamerica b/time/northamerica deleted file mode 100644 index baaf84095a..0000000000 --- a/time/northamerica +++ /dev/null @@ -1,1345 +0,0 @@ -# @(#)northamerica 7.39 -# 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 <eggert@twinsun.com> (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 <eggert@twinsun.com> (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 <eggert@twinsun.com> (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 <LAW@encmail.encompass.com> 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. - -# Canada - -# From Alain LaBont<e'> <ALB@immedia.ca> (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 Avanc<e'>e 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 <eggert@twinsun.com> (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. - -# From Paul Eggert (1997-10-17): -# msb@sq.com writes that an article in the 1997-10-14 Toronto Star -# says that Atikokan, Ontario currently does not observe DST, -# but will vote on 11-10 whether to use EST/EDT. -# He also writes that the -# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> -# Ontario Time Act (1990, Chapter T.9) -# </a> -# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. -# Officially Atikokan is therefore on CST/CDT, and most likely this report -# concerns a non-official time observed as a matter of local practice. -# For what it's worth, Shanks (1995) says that Atikokan has agreed with -# Rainy River ever since standard time was introduced. - -# 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 <jones@skdad.usask.ca> (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 <mathew@io.org> (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 [before] 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 <eggert@twinsun.com> (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 <alan.perry@eng.sun.com> (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 -# <a href="http://mexico-travel.com/extra/timezone_eng.html"> -# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). -# </a> - -# 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 1990 - 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 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 only - Oct Sun>=1 0:00s 0 S -Rule Cuba 1997 max - Oct Sun>=8 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 -# From Paul Eggert (1997-08-31): -# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. -# Luckily, Olveston, the current de facto capital, has the same longitude. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston - -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 |