northamerica revision 136638
176195Sbrian# @(#)northamerica 7.69 276195Sbrian# also includes Central America and the Caribbean 376195Sbrian 476195Sbrian# This data is by no means authoritative; if you think you know better, 576195Sbrian# go ahead and edit the file (and please send any changes to 676195Sbrian# tz@elsie.nci.nih.gov for general use in the future). 776195Sbrian 876195Sbrian# From Paul Eggert <eggert@twinsun.com> (1999-03-22): 976195Sbrian# A reliable and entertaining source about time zones is 1076195Sbrian# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 1176195Sbrian 1276195Sbrian############################################################################### 1376195Sbrian 1476195Sbrian# United States 1576195Sbrian 1676195Sbrian# From Paul Eggert (1999-03-31): 1776195Sbrian# Howse writes (pp 121-125) that time zones were invented by 1876195Sbrian# Professor Charles Ferdinand Dowd (1825-1904), 1976195Sbrian# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 2076195Sbrian# His pamphlet ``A System of National Time for Railroads'' (1870) 2176195Sbrian# was the result of his proposals at the Convention of Railroad Trunk Lines 2276195Sbrian# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 2376195Sbrian# but in 1872-05 he moved the proposed origin to Greenwich. 2476195Sbrian# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 2576195Sbrian# and the most of the country soon followed suit. 2676195Sbrian 2776195Sbrian# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 2876195Sbrian# A good source for time zone historical data in the US is 2976195Sbrian# Thomas G. Shanks, The American Atlas (5th edition), 3076195Sbrian# San Diego: ACS Publications, Inc. (1991). 3176195Sbrian# Make sure you have the errata sheet; the book is somewhat useless without it. 3276195Sbrian# It is the source for the US and Puerto Rico entries below. 3376195Sbrian 3476195Sbrian# From Paul Eggert (2001-03-06): 3576195Sbrian# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 3676195Sbrian# in his whimsical essay ``An Economical Project for Diminishing the Cost 3776195Sbrian# of Light'' published in the Journal de Paris (1784-04-26). 3876195Sbrian# Not everyone is happy with the results: 3976195Sbrian# 4076195Sbrian# I don't really care how time is reckoned so long as there is some 4176195Sbrian# agreement about it, but I object to being told that I am saving 4276195Sbrian# daylight when my reason tells me that I am doing nothing of the kind. 4376195Sbrian# I even object to the implication that I am wasting something 4476195Sbrian# valuable if I stay in bed after the sun has risen. As an admirer 4576195Sbrian# of moonlight I resent the bossy insistence of those who want to 4676195Sbrian# reduce my time for enjoying it. At the back of the Daylight Saving 4776195Sbrian# scheme I detect the bony, blue-fingered hand of Puritanism, eager 4876195Sbrian# to push people into bed earlier, and get them up earlier, to make 4976195Sbrian# them healthy, wealthy and wise in spite of themselves. 5076195Sbrian# 5176195Sbrian# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 5276195Sbrian# 5376195Sbrian# For more about the first ten years of DST in the United States, see 5476195Sbrian# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 5576195Sbrian# Ten years of daylight saving from the Pittsburgh standpoint 5676195Sbrian# (Carnegie Library of Pittsburgh, 1927)</a>. 5776195Sbrian# 5876195Sbrian# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 5976195Sbrian# However, DST was imposed by the Standard Time Act of 1918, which 6076195Sbrian# was the first nationwide legal time standard, and apparently 6176195Sbrian# time was just called "Standard Time" or "Daylight Saving Time". 6276195Sbrian 6376195Sbrian# From Arthur David Olson: 6476195Sbrian# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 6576195Sbrian# See, for example, the front page of the Saturday, 1974-10-26 6676195Sbrian# and Sunday, 1974-10-27 editions of the Washington Post. 6776195Sbrian 6876195Sbrian# From Arthur David Olson: 6976195Sbrian# Before the Uniform Time Act of 1966 took effect in 1967, observance of 7076195Sbrian# Daylight Saving Time in the US was by local option, except during wartime. 7176195Sbrian 7276195Sbrian# From Arthur David Olson (2000-09-25): 7376195Sbrian# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 7476195Sbrian# In the introduction, Oboler spoke of "Eastern Peace Time." 7576195Sbrian# An AltaVista search turned up 7676195Sbrian# <a href="http://rowayton.org/rhs/hstaug45.html">: 7776195Sbrian# "When the time is announced over the radio now, it is 'Eastern Peace 7876195Sbrian# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 7976195Sbrian# </a> (August 1945) by way of confirmation. 8076195Sbrian 8176195Sbrian# From Joseph Gallant <notquite@hotmail.com>, citing 8276195Sbrian# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 8376195Sbrian# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 8476195Sbrian# to switch to London for Attlee's address, but the American people 8576195Sbrian# never got to hear his speech live. According to one press account, 8676195Sbrian# CBS' Bob Trout was first to announce the word of Japan's surrender, 8776195Sbrian# but a few seconds later, NBC, ABC and Mutual also flashed the word 8876195Sbrian# of surrender, all of whom interrupting the bells of Big Ben in 8976195Sbrian# London which were to precede Mr. Attlee's speech. 9076195Sbrian 9176195Sbrian# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 9276195Sbrian# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 9376195Sbrian# 9476195Sbrian# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 9576195Sbrian# Any announcement from Asia would reach St. John's New York newsroom on a 9676195Sbrian# wire service teletype machine, which had prescribed signals for major news. 9776195Sbrian# Associated Press, for example, would ring five bells before spewing out 9876195Sbrian# typed copy of an important story, and 10 bells for news "of transcendental 9976195Sbrian# importance." 10076195Sbrian# 10176195Sbrian# On Aug. 14, stalling while talking steadily into the NBC networks' open 10276195Sbrian# microphone, St. John heard five bells and waited only to hear a sixth bell, 10376195Sbrian# before announcing confidently: "Ladies and gentlemen, World War II is over. 10476195Sbrian# The Japanese have agreed to our surrender terms." 10576195Sbrian# 10676195Sbrian# He had scored a 20-second scoop on other broadcasters. 10776195Sbrian 10876195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10976195SbrianRule US 1918 1919 - Mar lastSun 2:00 1:00 D 11076195SbrianRule US 1918 1919 - Oct lastSun 2:00 0 S 11176195SbrianRule US 1942 only - Feb 9 2:00 1:00 W # War 11276195SbrianRule US 1945 only - Aug 14 23:00u 1:00 P # Peace 11376195SbrianRule US 1945 only - Sep 30 2:00 0 S 11476195SbrianRule US 1967 max - Oct lastSun 2:00 0 S 11576195SbrianRule US 1967 1973 - Apr lastSun 2:00 1:00 D 11676195SbrianRule US 1974 only - Jan 6 2:00 1:00 D 11776195SbrianRule US 1975 only - Feb 23 2:00 1:00 D 11876195SbrianRule US 1976 1986 - Apr lastSun 2:00 1:00 D 11976195SbrianRule US 1987 max - Apr Sun>=1 2:00 1:00 D 12076195Sbrian# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 12176195Sbrian# H.R.177 12276195Sbrian# </a> (introduced 1999-01-06) would change April to March in the above rule. 12376195Sbrian 12476195Sbrian# From Bob Devine (1988-01-28): 12576195Sbrian# ...Alaska (and Hawaii) had the timezone names changed in 1967. 12676195Sbrian# old new 12776195Sbrian# Pacific Standard Time(PST) -same- 12876195Sbrian# Yukon Standard Time(YST) -same- 12976195Sbrian# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 13076195Sbrian# Nome Standard Time (NT) Bering Standard Time (BST) 13176195Sbrian# 13276195Sbrian# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 13376195Sbrian# The YST zone now covers nearly all of the state, AHST just part 13476195Sbrian# of the Aleutian islands. No DST. 13576195Sbrian 13676195Sbrian# From Paul Eggert (1995-12-19): 13776195Sbrian# The tables below use `NST', not `NT', for Nome Standard Time. 13876195Sbrian# I invented `CAWT' for Central Alaska War Time. 13976195Sbrian 14076195Sbrian# From U. S. Naval Observatory (1989-01-19): 14176195Sbrian# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 14276195Sbrian# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 14376195Sbrian# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 14476195Sbrian# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 14576195Sbrian# USA MOUNTAIN 7 H BEHIND UTC DENVER 14676195Sbrian# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 14776195Sbrian# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 14876195Sbrian# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 14976195Sbrian# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 15076195Sbrian# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 15176195Sbrian# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 15276195Sbrian# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 15376195Sbrian# USA HAWAII 10 H BEHIND UTC 15476195Sbrian# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 15576195Sbrian 15676195Sbrian# From Arthur David Olson (1989-01-21): 15776195Sbrian# The above dates are for 1988. 15876195Sbrian# Note the "AKST" and "AKDT" abbreviations, the claim that there's 15976195Sbrian# no DST in Samoa, and the claim that there is DST in Alaska and the 16076195Sbrian# Aleutians. 16176195Sbrian 16276195Sbrian# From Arthur David Olson (1988-02-13): 16376195Sbrian# Legal standard time zone names, from United States Code (1982 Edition and 16476195Sbrian# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 16576195Sbrian# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 16676195Sbrian# took effect), as explained in sections 263 and 261: 16776195Sbrian# (none) 16876195Sbrian# United States standard eastern time 16976195Sbrian# United States standard mountain time 17076195Sbrian# United States standard central time 17176195Sbrian# United States standard Pacific time 17276195Sbrian# (none) 17376195Sbrian# United States standard Alaska time 17476195Sbrian# (none) 17576195Sbrian# Next, names from 1967-04-01 until 1983-11-30 (the date for 17676195Sbrian# public law 98-181): 17776195Sbrian# Atlantic standard time 17876195Sbrian# eastern standard time 17976195Sbrian# central standard time 18076195Sbrian# mountain standard time 18176195Sbrian# Pacific standard time 18276195Sbrian# Yukon standard time 18376195Sbrian# Alaska-Hawaii standard time 18476195Sbrian# Bering standard time 18576195Sbrian# And after 1983-11-30: 18676195Sbrian# Atlantic standard time 18776195Sbrian# eastern standard time 18876195Sbrian# central standard time 18976195Sbrian# mountain standard time 19076195Sbrian# Pacific standard time 19176195Sbrian# Alaska standard time 19276195Sbrian# Hawaii-Aleutian standard time 19376195Sbrian# Samoa standard time 19476195Sbrian# The law doesn't give abbreviations. 19576195Sbrian# 19676195Sbrian# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 19776195Sbrian# Public law 106-564 (2000-12-23) introduced the abbreviation 19876195Sbrian# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 19976195Sbrian# See the file "australasia". 20076195Sbrian 20176195Sbrian 20276195Sbrian# US eastern time, represented by New York 20376195Sbrian 20476195Sbrian# Connecticut, Delaware, District of Columbia, most of Florida, 20576195Sbrian# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and 20676195Sbrian# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts, 20776195Sbrian# New Hampshire, New Jersey, New York, North Carolina, Ohio, 20876195Sbrian# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 20976195Sbrian# Vermont, Virginia, West Virginia 21076195Sbrian 21176195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 21276195SbrianRule NYC 1920 only - Mar lastSun 2:00 1:00 D 21376195SbrianRule NYC 1920 only - Oct lastSun 2:00 0 S 21476195SbrianRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 21576195SbrianRule NYC 1921 1954 - Sep lastSun 2:00 0 S 21676195SbrianRule NYC 1955 1966 - Oct lastSun 2:00 0 S 21776195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 21876195SbrianZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 21976195Sbrian -5:00 US E%sT 1920 22076195Sbrian -5:00 NYC E%sT 1942 22176195Sbrian -5:00 US E%sT 1946 22276195Sbrian -5:00 NYC E%sT 1967 22376195Sbrian -5:00 US E%sT 22476195Sbrian 22576195Sbrian# US central time, represented by Chicago 22676195Sbrian 22776195Sbrian# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 22876195Sbrian# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 22976195Sbrian# Washington counties), Illinois, western Indiana 23076195Sbrian# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 23176195Sbrian# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 23276195Sbrian# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 23376195Sbrian# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 23476195Sbrian# western Tennessee, most of Texas, Wisconsin 23576195Sbrian 23676195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 23776195SbrianRule Chicago 1920 only - Jun 13 2:00 1:00 D 23876195SbrianRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 23976195SbrianRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 24076195SbrianRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 24176195SbrianRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 24276195SbrianRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 24376195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 24476195SbrianZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 24576195Sbrian -6:00 US C%sT 1920 24676195Sbrian -6:00 Chicago C%sT 1936 Mar 1 2:00 24776195Sbrian -5:00 - EST 1936 Nov 15 2:00 24876195Sbrian -6:00 Chicago C%sT 1942 24976195Sbrian -6:00 US C%sT 1946 25076195Sbrian -6:00 Chicago C%sT 1967 25176195Sbrian -6:00 US C%sT 25276195Sbrian# Oliver County, ND switched from mountain to central time on 1992-10-25. 25376195SbrianZone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00 25476195Sbrian -7:00 US M%sT 1992 Oct 25 02:00 25576195Sbrian -6:00 US C%sT 25676195Sbrian 25776195Sbrian# US mountain time, represented by Denver 25876195Sbrian# 25976195Sbrian# Colorado, far western Kansas, Montana, western 26076195Sbrian# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 26176195Sbrian# New Mexico, southwestern North Dakota, far eastern Oregon, 26276195Sbrian# western South Dakota, far western Texas (El Paso County, Hudspeth County, 26376195Sbrian# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 26476195Sbrian# 26576195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 26676195SbrianRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 26776195SbrianRule Denver 1920 only - Oct lastSun 2:00 0 S 26876195SbrianRule Denver 1921 only - May 22 2:00 0 S 26976195SbrianRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 27076195SbrianRule Denver 1965 1966 - Oct lastSun 2:00 0 S 27176195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 27276195SbrianZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 27376195Sbrian -7:00 US M%sT 1920 27476195Sbrian -7:00 Denver M%sT 1942 27576195Sbrian -7:00 US M%sT 1946 27676195Sbrian -7:00 Denver M%sT 1967 27776195Sbrian -7:00 US M%sT 27876195Sbrian 27976195Sbrian# US Pacific time, represented by Los Angeles 28076195Sbrian# 28176195Sbrian# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 28276195Sbrian# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 28376195Sbrian# most of Nevada, most of Oregon, and Washington 28476195Sbrian# 28576195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 28676195SbrianRule CA 1948 only - Mar 14 2:00 1:00 D 28776195SbrianRule CA 1949 only - Jan 1 2:00 0 S 28876195SbrianRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 28976195SbrianRule CA 1950 1961 - Sep lastSun 2:00 0 S 29076195SbrianRule CA 1962 1966 - Oct lastSun 2:00 0 S 29176195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 29276195SbrianZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 29376195Sbrian -8:00 US P%sT 1946 29476195Sbrian -8:00 CA P%sT 1967 29576195Sbrian -8:00 US P%sT 29676195Sbrian 29776195Sbrian# Alaska 29876195Sbrian# AK%sT is the modern abbreviation for -9:00 per USNO. 29976195Sbrian# 30076195Sbrian# From Paul Eggert (2001-05-30): 30176195Sbrian# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 30276195Sbrian# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 30376195Sbrian# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 30476195Sbrian# also a Friday. Include only the time zone part of this transition, 30576195Sbrian# ignoring the switch from Julian to Gregorian, since we can't represent 30676195Sbrian# the Julian calendar. 30776195Sbrian# 30876195Sbrian# As far as we know, none of the exact locations mentioned below were 30976195Sbrian# permanently inhabited in 1867 by anyone using either calendar. 31076195Sbrian# (Yakutat was colonized by the Russians in 1799, but the settlement 31176195Sbrian# was destroyed in 1805 by a Yakutat-kon war party.) However, there 31276195Sbrian# were nearby inhabitants in some cases and for our purposes perhaps 31376195Sbrian# it's best to simply use the official transition. 31476195Sbrian# 31576195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 31676195SbrianZone America/Juneau 15:02:19 - LMT 1867 Oct 18 31776195Sbrian -8:57:41 - LMT 1900 Aug 20 12:00 31876195Sbrian -8:00 - PST 1942 31976195Sbrian -8:00 US P%sT 1946 32076195Sbrian -8:00 - PST 1969 32176195Sbrian -8:00 US P%sT 1983 Oct 30 2:00 32276195Sbrian -9:00 US Y%sT 1983 Nov 30 32376195Sbrian -9:00 US AK%sT 32476195SbrianZone America/Yakutat 14:41:05 - LMT 1867 Oct 18 32576195Sbrian -9:18:55 - LMT 1900 Aug 20 12:00 32676195Sbrian -9:00 - YST 1942 32776195Sbrian -9:00 US Y%sT 1946 32876195Sbrian -9:00 - YST 1969 32976195Sbrian -9:00 US Y%sT 1983 Nov 30 33076195Sbrian -9:00 US AK%sT 33176195SbrianZone America/Anchorage 14:00:24 - LMT 1867 Oct 18 33276195Sbrian -9:59:36 - LMT 1900 Aug 20 12:00 33376195Sbrian -10:00 - CAT 1942 33476195Sbrian -10:00 US CAT/CAWT 1946 33576195Sbrian -10:00 - CAT 1967 Apr 33676195Sbrian -10:00 - AHST 1969 33776195Sbrian -10:00 US AH%sT 1983 Oct 30 2:00 33876195Sbrian -9:00 US Y%sT 1983 Nov 30 33976195Sbrian -9:00 US AK%sT 34076195SbrianZone America/Nome 12:58:21 - LMT 1867 Oct 18 34176195Sbrian -11:01:38 - LMT 1900 Aug 20 12:00 34276195Sbrian -11:00 - NST 1942 34376195Sbrian -11:00 US N%sT 1946 34476195Sbrian -11:00 - NST 1967 Apr 34576195Sbrian -11:00 - BST 1969 34676195Sbrian -11:00 US B%sT 1983 Oct 30 2:00 34776195Sbrian -9:00 US Y%sT 1983 Nov 30 34876195Sbrian -9:00 US AK%sT 34976195SbrianZone America/Adak 12:13:21 - LMT 1867 Oct 18 35076195Sbrian -11:46:38 - LMT 1900 Aug 20 12:00 35176195Sbrian -11:00 - NST 1942 35276195Sbrian -11:00 US N%sT 1946 35376195Sbrian -11:00 - NST 1967 Apr 35476195Sbrian -11:00 - BST 1969 35576195Sbrian -11:00 US B%sT 1983 Oct 30 2:00 35676195Sbrian -10:00 US AH%sT 1983 Nov 30 35776195Sbrian -10:00 US HA%sT 35876195Sbrian# Shanks writes that part of southwest Alaska (e.g. Aniak) 35976195Sbrian# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 36076195Sbrian# and another part (e.g. Akiak) made the same switch five weeks later. 36176195Sbrian# These switches don't quite make our 1970 cutoff. 36276195Sbrian 36376195Sbrian# Hawaii 36476195Sbrian# 36576195Sbrian# From Arthur David Olson: 36676195Sbrian# And then there's Hawaii. 36776195Sbrian# DST was observed for one day in 1933; 36876195Sbrian# standard time was changed by half an hour in 1947; 36976195Sbrian# it's always standard as of 1986. 37076195Sbrian# 37176195Sbrian# From Paul Eggert: 37276195Sbrian# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 37376195Sbrian# 37476195SbrianZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 37576195Sbrian -10:30 - HST 1933 Apr 30 2:00 37676195Sbrian -10:30 1:00 HDT 1933 May 21 2:00 37776195Sbrian -10:30 US H%sT 1947 Jun 8 2:00 37876195Sbrian -10:00 - HST 37976195Sbrian 38076195Sbrian# Now we turn to US areas that have diverged from the consensus since 1970. 38176195Sbrian 38276195Sbrian# Arizona mostly uses MST. 38376195Sbrian 38476195Sbrian# From Paul Eggert (2002-10-20): 38576195Sbrian# 38676195Sbrian# The information in the rest of this paragraph is derived from the 38776195Sbrian# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 38876195Sbrian# Daylight Saving Time web page (2002-01-23)</a> maintained by the 38976195Sbrian# Arizona State Library, Archives and Public Records. 39076195Sbrian# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 39176195Sbrian# time, but by federal law railroads, airlines, bus lines, military 39276195Sbrian# personnel, and some engaged in interstate commerce continued to 39376195Sbrian# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 39476195Sbrian# Gazette says that was the date the law changed, and that 04-01 was 39576195Sbrian# the date the state's clocks would change. In 1945 the State of 39676195Sbrian# Arizona used standard time all year, again with exceptions only as 39776195Sbrian# mandated by federal law. Arizona observed DST in 1967, but Arizona 39876195Sbrian# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 39976195Sbrian# 40076195Sbrian# Shanks says the 1944 experiment came to an end on 1944-03-17. 40176195Sbrian# Go with the Arizona State Library instead. 40276195Sbrian 40376195SbrianZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 40476195Sbrian -7:00 US M%sT 1944 Jan 1 00:01 40576195Sbrian -7:00 - MST 1944 Apr 1 00:01 40676195Sbrian -7:00 US M%sT 1944 Oct 1 00:01 40776195Sbrian -7:00 - MST 1967 40876195Sbrian -7:00 US M%sT 1968 Mar 21 40976195Sbrian -7:00 - MST 41076195Sbrian# From Arthur David Olson (1988-02-13): 41176195Sbrian# A writer from the Inter Tribal Council of Arizona, Inc., 41276195Sbrian# notes in private correspondence dated 1987-12-28 that "Presently, only the 41376195Sbrian# Navajo Nation participates in the Daylight Saving Time policy, due to its 41476195Sbrian# large size and location in three states." (The "only" means that other 41576195Sbrian# tribal nations don't use DST.) 41676195Sbrian 41776195SbrianLink America/Denver America/Shiprock 41876195Sbrian 41976195Sbrian# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 42076195Sbrian# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 42176195Sbrian# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 42276195Sbrian# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 42376195Sbrian# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 42476195Sbrian# switched four weeks late in 1974. 42576195Sbrian# 42676195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 42776195SbrianZone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 42876195Sbrian -8:00 US P%sT 1923 May 13 2:00 42976195Sbrian -7:00 US M%sT 1974 43076195Sbrian -7:00 - MST 1974 Feb 3 2:00 43176195Sbrian -7:00 US M%sT 43276195Sbrian 43376195Sbrian# Indiana 43476195Sbrian# 43576195Sbrian# For a map of Indiana's time zone regions, see: 43676195Sbrian# <a href="http://www.mccsc.edu/time.html"> 43776195Sbrian# What time is it in Indiana? 43876195Sbrian# </a> (1999-04-06) 43976195Sbrian# 44076195Sbrian# From Paul Eggert (1995-12-19): 44176195Sbrian# Indiana generally observes either EST all year, or CST/CDT, 44276195Sbrian# but areas near Cincinnati and Louisville use those cities' timekeeping 44376195Sbrian# and in 1969 and 1970 the whole state observed daylight time; 44476195Sbrian# and there are other exceptions as noted below. 44576195Sbrian# Shanks partitions Indiana into 345 regions, each with its own time history, 44676195Sbrian# and writes ``Even newspaper reports present contradictory information.'' 44776195Sbrian# Fortunately, most of the complexity occurred before our cutoff date of 1970. 44876195Sbrian# 44976195Sbrian# Since 1970, EST-only Indiana has been like America/Indianapolis, 45076195Sbrian# with exceptions noted below for Crawford, Starke, and Switzerland counties. 45176195Sbrian# The parts of Indiana not listed below have been like America/Chicago, 45276195Sbrian# America/Louisville, or America/New_York. 45376195Sbrian# 45476195Sbrian# Other than Indianapolis, the Indiana place names are so nondescript 45576195Sbrian# that they would be ambiguous if we left them at the `America' level. 45676195Sbrian# So we reluctantly put them all in a subdirectory `America/Indiana'. 45776195Sbrian# 45876195Sbrian# Most of EST-only Indiana last observed DST in 1970. 45976195Sbrian 46076195Sbrian# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: 46176195Sbrian# Pam Belluck reported in the New York Times (2001-01-31) that the 46276195Sbrian# Indiana Legislature is considering a bill to adopt DST statewide. 46376195Sbrian# Her article mentioned Vevay, whose post office observes a different 46476195Sbrian# time zone from Danner's Hardware across the street. 46576195Sbrian 46676195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 46776195SbrianRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 46876195SbrianRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 46976195SbrianRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 47076195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 47176195SbrianZone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 47276195Sbrian -6:00 US C%sT 1920 47376195Sbrian -6:00 Indianapolis C%sT 1942 47476195Sbrian -6:00 US C%sT 1946 47576195Sbrian -6:00 Indianapolis C%sT 1955 Apr 24 2:00 47676195Sbrian -5:00 - EST 1957 Sep 29 2:00 47776195Sbrian -6:00 - CST 1958 Apr 27 2:00 47876195Sbrian -5:00 - EST 1969 47976195Sbrian -5:00 US E%sT 1971 48076195Sbrian -5:00 - EST 48176195SbrianLink America/Indianapolis America/Indiana/Indianapolis 48276195Sbrian# 48376195Sbrian# Part of Crawford County, Indiana, last observed DST in 1975, 48476195Sbrian# and left its clocks alone in 1974. 48576195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 48676195SbrianRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 48776195SbrianRule Marengo 1951 only - Sep lastSun 2:00 0 S 48876195SbrianRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 48976195SbrianRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 49076195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 49176195SbrianZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 49276195Sbrian -6:00 US C%sT 1951 49376195Sbrian -6:00 Marengo C%sT 1961 Apr 30 2:00 49476195Sbrian -5:00 - EST 1969 49576195Sbrian -5:00 US E%sT 1974 Jan 6 2:00 49676195Sbrian -6:00 1:00 CDT 1974 Oct 27 2:00 49776195Sbrian -5:00 US E%sT 1976 49876195Sbrian -5:00 - EST 49976195Sbrian# 50076195Sbrian# Starke County, Indiana 50176195Sbrian# From Arthur David Olson (1991-10-28): 50276195Sbrian# An article on page A3 of the Sunday, 1991-10-27 Washington Post 50376195Sbrian# notes that Starke County switched from Central time to Eastern time as of 50476195Sbrian# 1991-10-27. 50576195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 50676195SbrianRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 50776195SbrianRule Starke 1947 1954 - Sep lastSun 2:00 0 S 50876195SbrianRule Starke 1955 1956 - Oct lastSun 2:00 0 S 50976195SbrianRule Starke 1957 1958 - Sep lastSun 2:00 0 S 51076195SbrianRule Starke 1959 1961 - Oct lastSun 2:00 0 S 51176195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 51276195SbrianZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 51376195Sbrian -6:00 US C%sT 1947 51476195Sbrian -6:00 Starke C%sT 1962 Apr 29 2:00 51576195Sbrian -5:00 - EST 1963 Oct 27 2:00 51676195Sbrian -6:00 US C%sT 1991 Oct 27 2:00 51776195Sbrian -5:00 - EST 51876195Sbrian# 51976195Sbrian# Switzerland County, Indiana, last observed DST in 1972. 52076195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 52176195SbrianZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 52276195Sbrian -6:00 US C%sT 1954 Apr 25 2:00 52376195Sbrian -5:00 - EST 1969 52476195Sbrian -5:00 US E%sT 1973 52576195Sbrian -5:00 - EST 52676195Sbrian 52776195Sbrian# Part of Kentucky left its clocks alone in 1974. 52876195Sbrian# This also includes a part of Indiana immediately adjacent to Louisville. 52976195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 53076195SbrianRule Louisville 1921 only - May 1 2:00 1:00 D 53176195SbrianRule Louisville 1921 only - Sep 1 2:00 0 S 53276195SbrianRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 53376195SbrianRule Louisville 1941 only - Sep lastSun 2:00 0 S 53476195SbrianRule Louisville 1946 only - Jun 2 2:00 0 S 53576195SbrianRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 53676195SbrianRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 53776195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 53876195SbrianZone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 53976195Sbrian -6:00 US C%sT 1921 54076195Sbrian -6:00 Louisville C%sT 1942 54176195Sbrian -6:00 US C%sT 1946 54276195Sbrian -6:00 Louisville C%sT 1961 Jul 23 2:00 54376195Sbrian -5:00 - EST 1968 54476195Sbrian -5:00 US E%sT 1974 Jan 6 2:00 54576195Sbrian -6:00 1:00 CDT 1974 Oct 27 2:00 54676195Sbrian -5:00 US E%sT 54776195SbrianLink America/Louisville America/Kentucky/Louisville 54876195Sbrian# 54976195Sbrian# Wayne, Clinton, and Russell Counties, Kentucky 55076195Sbrian# 55176195Sbrian# From 55276195Sbrian# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 55376195Sbrian# Lake Cumberland LIFE 55476195Sbrian# </a> (1999-01-29) via WKYM-101.7: 55576195Sbrian# Clinton County has joined Wayne County in asking the DoT to change from 55676195Sbrian# the Central to the Eastern time zone.... The Wayne County government made 55776195Sbrian# the same request in December. And while Russell County officials have not 55876195Sbrian# taken action, the majority of respondents to a poll conducted there in 55976195Sbrian# August indicated they would like to change to "fast time" also. 56076195Sbrian# The three Lake Cumberland counties are the farthest east of any U.S. 56176195Sbrian# location in the Central time zone. 56276195Sbrian# 56376195Sbrian# From Rich Wales (2000-08-29): 56476195Sbrian# After prolonged debate, and despite continuing deep differences of opinion, 56576195Sbrian# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 56676195Sbrian# (-0500) time. They won't "fall back" this year. See Sara Shipley, 56776195Sbrian# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 56876195Sbrian# 56976195Sbrian# From Paul Eggert (2001-07-16): 57076195Sbrian# The final rule was published in the 57176195Sbrian# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 57276195Sbrian# Federal Register 65, 160 (2000-08-17), page 50154-50158. 57376195Sbrian# </a> 57476195Sbrian# 57576195SbrianZone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00 57676195Sbrian -6:00 US C%sT 1946 57776195Sbrian -6:00 - CST 1968 57876195Sbrian -6:00 US C%sT 2000 Oct 29 2:00 57976195Sbrian -5:00 US E%sT 58076195Sbrian 58176195Sbrian 58276195Sbrian# From Rives McDow (2000-08-30): 58376195Sbrian# Here ... are all the changes in the US since 1985. 58476195Sbrian# Kearny County, KS (put all of county on central; 58576195Sbrian# previously split between MST and CST) ... 1990-10 58676195Sbrian# Starke County, IN (from CST to EST) ... 1991-10 58776195Sbrian# Oliver County, ND (from MST to CST) ... 1992-10 58876195Sbrian# West Wendover, NV (from PST TO MST) ... 1999-10 58976195Sbrian# Wayne County, KY (from CST to EST) ... 2000-10 59076195Sbrian# 59176195Sbrian# From Paul Eggert (2001-07-17): 59276195Sbrian# We don't know where the line used to be within Kearny County, KS, 59376195Sbrian# so omit that change for now. 59476195Sbrian# See America/Indiana/Knox for the Starke County, IN change. 59576195Sbrian# See America/North_Dakota/Center for the Oliver County, ND change. 59676195Sbrian# West Wendover, NV officially switched from Pacific to mountain time on 59776195Sbrian# 1999-10-31. See the 59876195Sbrian# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 59976195Sbrian# Federal Register 64, 203 (1999-10-21), page 56705-56707. 60076195Sbrian# </a> 60176195Sbrian# However, the Federal Register says that West Wendover already operated 60276195Sbrian# on mountain time, and the rule merely made this official; 60376195Sbrian# hence a separate tz entry is not needed. 60476195Sbrian 60576195Sbrian# Michigan 60676195Sbrian# 60776195Sbrian# From Bob Devine (1988-01-28): 60876195Sbrian# Michigan didn't observe DST from 1968 to 1973. 60976195Sbrian# 61076195Sbrian# From Paul Eggert (1999-03-31): 61176195Sbrian# Shanks writes that Michigan started using standard time on 1885-09-18, 61276195Sbrian# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 61376195Sbrian# that Detroit kept 61476195Sbrian# 61576195Sbrian# local time until 1900 when the City Council decreed that clocks should 61676195Sbrian# be put back twenty-eight minutes to Central Standard Time. Half the 61776195Sbrian# city obeyed, half refused. After considerable debate, the decision 61876195Sbrian# was rescinded and the city reverted to Sun time. A derisive offer to 61976195Sbrian# erect a sundial in front of the city hall was referred to the 62076195Sbrian# Committee on Sewers. Then, in 1905, Central time was adopted 62176195Sbrian# by city vote. 62276195Sbrian# 62376195Sbrian# This story is too entertaining to be false, so go with Howse over Shanks. 62476195Sbrian# 62576195Sbrian# From Paul Eggert (2001-03-06): 62676195Sbrian# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 62776195Sbrian# one hour in 1914.'' This change is not in Shanks. We have no more 62876195Sbrian# info, so omit this for now. 62976195Sbrian# 63076195Sbrian# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 63176195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 63276195SbrianRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 63376195SbrianRule Detroit 1948 only - Sep lastSun 2:00 0 S 63476195SbrianRule Detroit 1967 only - Jun 14 2:00 1:00 D 63576195SbrianRule Detroit 1967 only - Oct lastSun 2:00 0 S 63676195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 63776195SbrianZone America/Detroit -5:32:11 - LMT 1905 63876195Sbrian -6:00 - CST 1915 May 15 2:00 63976195Sbrian -5:00 - EST 1942 64076195Sbrian -5:00 US E%sT 1946 64176195Sbrian -5:00 Detroit E%sT 1973 64276195Sbrian -5:00 US E%sT 1975 64376195Sbrian -5:00 - EST 1975 Apr 27 2:00 64476195Sbrian -5:00 US E%sT 64576195Sbrian# 64676195Sbrian# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 64776195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 64876195SbrianRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 64976195SbrianRule Menominee 1946 only - Sep lastSun 2:00 0 S 65076195SbrianRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 65176195SbrianRule Menominee 1966 only - Oct lastSun 2:00 0 S 65276195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 65376195SbrianZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 65476195Sbrian -6:00 US C%sT 1946 65576195Sbrian -6:00 Menominee C%sT 1969 Apr 27 2:00 65676195Sbrian -5:00 - EST 1973 Apr 29 2:00 65776195Sbrian -6:00 US C%sT 65876195Sbrian 65976195Sbrian# Navassa 66076195Sbrian# administered by the US Fish and Wildlife Service 66176195Sbrian# claimed by US under the provisions of the 1856 Guano Islands Act 66276195Sbrian# also claimed by Haiti 66376195Sbrian# occupied 1857/1900 by the Navassa Phosphate Co 66476195Sbrian# US lighthouse 1917/1996-09 66576195Sbrian# currently uninhabited 66676195Sbrian# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 66776195Sbrian# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 66876195Sbrian# Jimmy Skaggs, _The Great Guano Rush_ (1994). 66976195Sbrian 67076195Sbrian# Old names, for S5 users 67176195Sbrian 67276195Sbrian# Link LINK-FROM LINK-TO 67376195SbrianLink America/New_York EST5EDT 67476195SbrianLink America/Chicago CST6CDT 67576195SbrianLink America/Denver MST7MDT 67676195SbrianLink America/Los_Angeles PST8PDT 67776195SbrianLink America/Indianapolis EST 67876195SbrianLink America/Phoenix MST 67976195SbrianLink Pacific/Honolulu HST 68076195Sbrian 68176195Sbrian################################################################################ 68276195Sbrian 68376195Sbrian 68476195Sbrian# From Paul Eggert <eggert@twinsun.com> (1999-10-29): 68576195Sbrian# A good source for time zone historical data outside the US is 68676195Sbrian# Thomas G. Shanks, The International Atlas (5th edition), 68776195Sbrian# San Diego: ACS Publications, Inc. (1999). 68876195Sbrian# 68976195Sbrian# Gwillim Law writes that a good source 69076195Sbrian# for recent time zone data is the International Air Transport 69176195Sbrian# Association's Standard Schedules Information Manual (IATA SSIM), 69276195Sbrian# published semiannually. Law sent in several helpful summaries 69376195Sbrian# of the IATA's data after 1990. 69476195Sbrian# 69576195Sbrian# Except where otherwise noted, Shanks is the source for entries through 1990, 69676195Sbrian# and IATA SSIM is the source for entries after 1990. 69776195Sbrian# 69876195Sbrian# Other sources occasionally used include: 69976195Sbrian# 70076195Sbrian# Edward W. Whitman, World Time Differences, 70176195Sbrian# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 70276195Sbrian# which I found in the UCLA library. 70376195Sbrian# 70476195Sbrian# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 70576195Sbrian# William Willett, The Waste of Daylight, 19th edition 70676195Sbrian# </a> (1914-03) 70776195Sbrian# 70876195Sbrian# See the `europe' file for Greenland. 70976195Sbrian 71076195Sbrian# Canada 71176195Sbrian 71276195Sbrian# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 71376195Sbrian# I post here the time zone abbreviations standardized in Canada 71476195Sbrian# for both English and French in the CAN/CSA-Z234.4-89 standard.... 71576195Sbrian# 71676195Sbrian# UTC Standard time Daylight savings time 71776195Sbrian# offset French English French English 71876195Sbrian# -2:30 - - HAT NDT 71976195Sbrian# -3 - - HAA ADT 72076195Sbrian# -3:30 HNT NST - - 72176195Sbrian# -4 HNA AST HAE EDT 72276195Sbrian# -5 HNE EST HAC CDT 72376195Sbrian# -6 HNC CST HAR MDT 72476195Sbrian# -7 HNR MST HAP PDT 72576195Sbrian# -8 HNP PST HAY YDT 72676195Sbrian# -9 HNY YST - - 72776195Sbrian# 72876195Sbrian# HN: Heure Normale ST: Standard Time 72976195Sbrian# HA: Heure Avanc<e'>e DT: Daylight saving Time 73076195Sbrian# 73176195Sbrian# A: de l'Atlantique Atlantic 73276195Sbrian# C: du Centre Central 73376195Sbrian# E: de l'Est Eastern 73476195Sbrian# M: Mountain 73576195Sbrian# N: Newfoundland 73676195Sbrian# P: du Pacifique Pacific 73776195Sbrian# R: des Rocheuses 73876195Sbrian# T: de Terre-Neuve 73976195Sbrian# Y: du Yukon Yukon 74076195Sbrian# 74176195Sbrian# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 74276195Sbrian# Alas, this sort of thing must be handled by localization software. 74376195Sbrian 74476195Sbrian# Unless otherwise specified, the data for Canada are all from Shanks. 74576195Sbrian 74676195Sbrian# From Paul Eggert (2000-10-02): 74776195Sbrian# H. David Matthews and Mary Vincent's map 74876195Sbrian# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 74976195Sbrian# "It's about TIME", _Canadian Geographic_ (September-October 1998) 75076195Sbrian# </a> contains detailed boundaries for regions observing nonstandard 75176195Sbrian# time and daylight saving time arrangements in Canada circa 1998. 75276195Sbrian# 75376195Sbrian# INMS, the Institute for National Measurement Standards in Ottawa, has 75476195Sbrian# <a href="http://www.nrc.ca/inms/time/tze.html"> 75576195Sbrian# information about standard and daylight saving time zones in Canada. 75676195Sbrian# </a> (updated periodically). 75776195Sbrian# Its unofficial information is often taken from Matthews and Vincent. 75876195Sbrian 75976195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 76076195SbrianRule Canada 1918 only - Apr 14 2:00 1:00 D 76176195SbrianRule Canada 1918 only - Oct 31 2:00 0 S 76276195SbrianRule Canada 1942 only - Feb 9 2:00 1:00 W # War 76376195SbrianRule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 76476195SbrianRule Canada 1945 only - Sep 30 2:00 0 S 76576195SbrianRule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 76676195SbrianRule Canada 1974 max - Oct lastSun 2:00 0 S 76776195SbrianRule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 76876195Sbrian 76976195Sbrian 77076195Sbrian# Newfoundland (and far southeast Labrador) 77176195Sbrian 77276195Sbrian# From Paul Eggert (2000-10-02): 77376195Sbrian# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 77476195Sbrian# but the only part of Labrador that follows the rules is the 77576195Sbrian# southeast corner, including Port Hope Simpson and Mary's Harbour, 77676195Sbrian# but excluding, say, Black Tickle. 77776195Sbrian 77876195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 77976195SbrianRule StJohns 1917 only - Apr 8 2:00 1:00 D 78076195SbrianRule StJohns 1917 only - Sep 17 2:00 0 S 78176195Sbrian# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 78276195SbrianRule StJohns 1919 only - May 5 23:00 1:00 D 78376195SbrianRule StJohns 1919 only - Aug 12 23:00 0 S 78476195Sbrian# For 1931-1935 Whitman gives Apr same date; go with Shanks. 78576195SbrianRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 78676195SbrianRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 78776195Sbrian# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 78876195SbrianRule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 78976195SbrianRule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 79076195Sbrian# Whitman gives the following transitions: 79176195Sbrian# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 79276195Sbrian# but go with Shanks and assume they used Canadian rules. 79376195Sbrian# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 79476195Sbrian# Apr 30 - Sep 24; go with Shanks. 79576195SbrianRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 79676195SbrianRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 79776195SbrianRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 79876195SbrianRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 79976195SbrianRule StJohns 1960 1986 - Oct lastSun 2:00 0 S 80076195Sbrian# From Paul Eggert (2000-10-02): 80176195Sbrian# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 80276195Sbrian# at 00:01 local time. For now, assume it started in 1987. 80376195SbrianRule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 80476195SbrianRule StJohns 1987 max - Oct lastSun 0:01 0 S 80576195SbrianRule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 80676195SbrianRule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 80776195Sbrian# St John's has an apostrophe, but Posix file names can't have apostrophes. 80876195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 80976195SbrianZone America/St_Johns -3:30:52 - LMT 1884 81076195Sbrian -3:30:52 StJohns N%sT 1918 81176195Sbrian -3:30:52 Canada N%sT 1919 81276195Sbrian -3:30:52 StJohns N%sT 1935 Mar 30 81376195Sbrian -3:30 StJohns N%sT 1942 May 11 81476195Sbrian -3:30 Canada N%sT 1946 81576195Sbrian -3:30 StJohns N%sT 81676195Sbrian 81776195Sbrian# most of east Labrador 81876195Sbrian 81976195Sbrian# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 82076195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 82176195SbrianZone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 82276195Sbrian -3:30:52 - NST 1918 82376195Sbrian -3:30:52 Canada N%sT 1919 82476195Sbrian -3:30:52 - NST 1935 Mar 30 82576195Sbrian -3:30 - NST 1936 82676195Sbrian -3:30 StJohns N%sT 1942 May 11 82776195Sbrian -3:30 Canada N%sT 1946 82876195Sbrian -3:30 StJohns N%sT 1966 Mar 15 2:00 82976195Sbrian -4:00 StJohns A%sT 83076195Sbrian 83176195Sbrian 83276195Sbrian# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 83376195Sbrian 83476195Sbrian# From Paul Eggert (1996-06-12): 83576195Sbrian# Shanks writes that since 1970 most of this region has been like Halifax. 83676195Sbrian# Many locales did not observe peacetime DST until 1972; 83776195Sbrian# Glace Bay, NS is the largest that we know of. 83876195Sbrian# Shanks also writes that Liverpool, NS was the only town in Canada to observe 83976195Sbrian# DST in 1971 but not 1970; for now we'll assume this is a typo. 84076195Sbrian 84176195Sbrian# From Paul Eggert (2000-10-02): 84276195Sbrian# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 84376195Sbrian# at 00:01 local time. FIXME: verify and create a new Zone for this. 84476195Sbrian 84576195Sbrian 84676195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 84776195SbrianRule Halifax 1916 only - Apr 1 0:00 1:00 D 84876195SbrianRule Halifax 1916 only - Oct 1 0:00 0 S 84976195SbrianRule Halifax 1920 only - May 9 0:00 1:00 D 85076195SbrianRule Halifax 1920 only - Aug 29 0:00 0 S 85176195SbrianRule Halifax 1921 only - May 6 0:00 1:00 D 85276195SbrianRule Halifax 1921 1922 - Sep 5 0:00 0 S 85376195SbrianRule Halifax 1922 only - Apr 30 0:00 1:00 D 85476195SbrianRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 85576195SbrianRule Halifax 1923 only - Sep 4 0:00 0 S 85676195SbrianRule Halifax 1924 only - Sep 15 0:00 0 S 85776195SbrianRule Halifax 1925 only - Sep 28 0:00 0 S 85876195SbrianRule Halifax 1926 only - May 16 0:00 1:00 D 85976195SbrianRule Halifax 1926 only - Sep 13 0:00 0 S 86076195SbrianRule Halifax 1927 only - May 1 0:00 1:00 D 86176195SbrianRule Halifax 1927 only - Sep 26 0:00 0 S 86276195SbrianRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 86376195SbrianRule Halifax 1928 only - Sep 9 0:00 0 S 86476195SbrianRule Halifax 1929 only - Sep 3 0:00 0 S 86576195SbrianRule Halifax 1930 only - Sep 15 0:00 0 S 86676195SbrianRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 86776195SbrianRule Halifax 1932 only - May 1 0:00 1:00 D 86876195SbrianRule Halifax 1933 only - Apr 30 0:00 1:00 D 86976195SbrianRule Halifax 1933 only - Oct 2 0:00 0 S 87076195SbrianRule Halifax 1934 only - May 20 0:00 1:00 D 87176195SbrianRule Halifax 1934 only - Sep 16 0:00 0 S 87276195SbrianRule Halifax 1935 only - Jun 2 0:00 1:00 D 87376195SbrianRule Halifax 1935 only - Sep 30 0:00 0 S 87476195SbrianRule Halifax 1936 only - Jun 1 0:00 1:00 D 87576195SbrianRule Halifax 1936 only - Sep 14 0:00 0 S 87676195SbrianRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 87776195SbrianRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 87876195SbrianRule Halifax 1939 only - May 28 0:00 1:00 D 87976195SbrianRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 88076195SbrianRule Halifax 1946 1949 - Sep lastSun 2:00 0 S 88176195SbrianRule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 88276195SbrianRule Halifax 1951 1954 - Sep lastSun 2:00 0 S 88376195SbrianRule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 88476195SbrianRule Halifax 1956 1959 - Sep lastSun 2:00 0 S 88576195SbrianRule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 88676195SbrianRule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 88776195SbrianRule Halifax 1962 1973 - Oct lastSun 2:00 0 S 88876195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 88976195SbrianZone America/Halifax -4:14:24 - LMT 1902 Jun 15 89076195Sbrian -4:00 Halifax A%sT 1918 89176195Sbrian -4:00 Canada A%sT 1919 89276195Sbrian -4:00 Halifax A%sT 1942 Feb 9 2:00s 89376195Sbrian -4:00 Canada A%sT 1946 89476195Sbrian -4:00 Halifax A%sT 1974 89576195Sbrian -4:00 Canada A%sT 89676195SbrianZone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 89776195Sbrian -4:00 Canada A%sT 1953 89876195Sbrian -4:00 Halifax A%sT 1954 89976195Sbrian -4:00 - AST 1972 90076195Sbrian -4:00 Halifax A%sT 1974 90176195Sbrian -4:00 Canada A%sT 90276195Sbrian 90376195Sbrian 90476195Sbrian# Ontario, Quebec 90576195Sbrian 90676195Sbrian# From Paul Eggert (1996-06-12): 90776195Sbrian# Shanks writes that since 1970 most of Ontario has been like Toronto, 90876195Sbrian# and most of Quebec has been like Montreal. 90976195Sbrian# Thunder Bay skipped DST in 1973. 91076195Sbrian# Many smaller locales did not observe peacetime DST until 1974; 91176195Sbrian# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 91276195Sbrian# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 91376195Sbrian 91476195Sbrian# From Mark Brader (2003-07-26): 91576195Sbrian# [According to the Toronto Star] Orillia, Ontario, adopted DST 91676195Sbrian# effective Saturday, 1912-06-22, 22:00; the article mentions that 91776195Sbrian# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 91876195Sbrian# have already done so. In Orillia DST was to run until Saturday, 91976195Sbrian# 1912-08-31 (no time mentioned), but it was met with considerable 92076195Sbrian# hostility from certain segments of the public, and was revoked after 92176195Sbrian# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 92276195Sbrian# presumably that should be -07-06. (1912-06-19, -07-12; also letters 92376195Sbrian# earlier in June). 92476195Sbrian# 92576195Sbrian# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 92676195Sbrian 92776195Sbrian# From Paul Eggert (1997-10-17): 92876195Sbrian# Mark Brader writes that an article in the 1997-10-14 Toronto Star 92976195Sbrian# says that Atikokan, Ontario currently does not observe DST, 93076195Sbrian# but will vote on 11-10 whether to use EST/EDT. 93176195Sbrian# He also writes that the 93276195Sbrian# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 93376195Sbrian# Ontario Time Act (1990, Chapter T.9) 93476195Sbrian# </a> 93576195Sbrian# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 93676195Sbrian# Officially Atikokan is therefore on CST/CDT, and most likely this report 93776195Sbrian# concerns a non-official time observed as a matter of local practice. 93876195Sbrian# For what it's worth, Shanks says that Atikokan has agreed with 93976195Sbrian# Rainy River ever since standard time was introduced. 94076195Sbrian 94176195Sbrian# From Paul Eggert (2000-10-02): 94276195Sbrian# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 94376195Sbrian# New Osnaburgh observe CST all year, that Big Trout Lake observes 94476195Sbrian# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 94576195Sbrian# violation of the official Ontario rules. 94676195Sbrian# They also write that Quebec east of the -63 meridian is supposed to 94776195Sbrian# observe AST, but residents as far east as Natashquan use EST/EDT, 94876195Sbrian# and residents east of Natashquan use AST. 94976195Sbrian# We probably need Zones for far east Quebec and for Atikokan, 95076195Sbrian# but we don't know when their practices started. 95176195Sbrian 95276195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 95376195SbrianRule Mont 1917 only - Mar 25 2:00 1:00 D 95476195SbrianRule Mont 1917 only - Apr 24 0:00 0 S 95576195SbrianRule Mont 1919 only - Mar 31 2:30 1:00 D 95676195SbrianRule Mont 1919 only - Oct 25 2:30 0 S 95776195SbrianRule Mont 1920 only - May 2 2:30 1:00 D 95876195SbrianRule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 95976195SbrianRule Mont 1921 only - May 1 2:00 1:00 D 96076195SbrianRule Mont 1922 only - Apr 30 2:00 1:00 D 96176195SbrianRule Mont 1924 only - May 17 2:00 1:00 D 96276195SbrianRule Mont 1924 1926 - Sep lastSun 2:30 0 S 96376195SbrianRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 96476195Sbrian# The 1927-to-1937 rules can be expressed more simply as 96576195Sbrian# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 96676195Sbrian# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 96776195Sbrian# The rules below avoid use of 24:00 96876195Sbrian# (which pre-1998 versions of zic cannot handle). 96976195SbrianRule Mont 1927 only - May 1 0:00 1:00 D 97076195SbrianRule Mont 1927 1932 - Sep lastSun 0:00 0 S 97176195SbrianRule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 97276195SbrianRule Mont 1932 only - May 1 0:00 1:00 D 97376195SbrianRule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 97476195SbrianRule Mont 1933 only - Oct 1 0:00 0 S 97576195SbrianRule Mont 1934 1939 - Sep lastSun 0:00 0 S 97676195SbrianRule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 97776195SbrianRule Mont 1945 1948 - Sep lastSun 2:00 0 S 97876195SbrianRule Mont 1949 1950 - Oct lastSun 2:00 0 S 97976195SbrianRule Mont 1951 1956 - Sep lastSun 2:00 0 S 98076195SbrianRule Mont 1957 1973 - Oct lastSun 2:00 0 S 98176195Sbrian 98276195SbrianRule Toronto 1919 only - Mar 30 23:30 1:00 D 98376195SbrianRule Toronto 1919 only - Oct 26 0:00 0 S 98476195SbrianRule Toronto 1920 only - May 2 2:00 1:00 D 98576195SbrianRule Toronto 1920 only - Sep 26 0:00 0 S 98676195SbrianRule Toronto 1921 only - May 15 2:00 1:00 D 98776195SbrianRule Toronto 1921 only - Sep 15 2:00 0 S 98876195SbrianRule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 98976195Sbrian# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 99076195SbrianRule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 99176195SbrianRule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 99276195Sbrian# The 1927-to-1939 rules can be expressed more simply as 99376195Sbrian# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 99476195Sbrian# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 99576195Sbrian# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 99676195Sbrian# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 99776195Sbrian# The rules below avoid use of Sun>=25 99876195Sbrian# (which pre-2004 versions of zic cannot handle). 99976195SbrianRule Toronto 1927 1932 - Sep lastSun 2:00 0 S 100076195SbrianRule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 100176195SbrianRule Toronto 1932 only - May 1 2:00 1:00 D 100276195SbrianRule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 100376195SbrianRule Toronto 1933 only - Oct 1 2:00 0 S 100476195SbrianRule Toronto 1934 1939 - Sep lastSun 2:00 0 S 100576195SbrianRule Toronto 1945 1946 - Sep lastSun 2:00 0 S 100676195SbrianRule Toronto 1946 only - Apr lastSun 2:00 1:00 D 100776195SbrianRule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 100876195SbrianRule Toronto 1947 1948 - Sep lastSun 0:00 0 S 100976195SbrianRule Toronto 1949 only - Nov lastSun 0:00 0 S 101076195SbrianRule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 101176195SbrianRule Toronto 1950 only - Nov lastSun 2:00 0 S 101276195SbrianRule Toronto 1951 1956 - Sep lastSun 2:00 0 S 101376195Sbrian# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 101476195Sbrian# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 101576195Sbrian# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 101676195SbrianRule Toronto 1957 1973 - Oct lastSun 2:00 0 S 101776195Sbrian 101876195Sbrian# From Paul Eggert (2003-07-27): 101976195Sbrian# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 102076195Sbrian# Port Arthur, Ontario, the principle of the Bill has been in 102176195Sbrian# operation for the past three years, and in the City of Moose Jaw, 102276195Sbrian# Saskatchewan, for one year." 102376195Sbrian 102476195Sbrian# From David Bryan via Tory Tronrud, Director/Curator, 102576195Sbrian# Thunder Bay Museum (2003-11-12): 102676195Sbrian# There is some suggestion, however, that, by-law or not, daylight 102776195Sbrian# savings time was being practiced in Fort William and Port Arthur 102876195Sbrian# before 1909.... [I]n 1910, the line between the Eastern and Central 102976195Sbrian# Time Zones was permanently moved about two hundred miles west to 103076195Sbrian# include the Thunder Bay area.... When Canada adopted daylight 103176195Sbrian# savings time in 1916, Fort William and Port Arthur, having done so 103276195Sbrian# already, did not change their clocks.... During the Second World 103376195Sbrian# War,... [t]he cities agreed to implement DST during the summer 103476195Sbrian# months for the remainder of the war years. 103576195Sbrian 103676195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 103776195SbrianZone America/Montreal -4:54:16 - LMT 1884 103876195Sbrian -5:00 Mont E%sT 1918 103976195Sbrian -5:00 Canada E%sT 1919 104076195Sbrian -5:00 Mont E%sT 1942 Feb 9 2:00s 104176195Sbrian -5:00 Canada E%sT 1946 104276195Sbrian -5:00 Mont E%sT 1974 104376195Sbrian -5:00 Canada E%sT 104476195SbrianZone America/Toronto -5:17:32 - LMT 1895 104576195Sbrian -5:00 Canada E%sT 1919 104676195Sbrian -5:00 Toronto E%sT 1942 Feb 9 2:00s 104776195Sbrian -5:00 Canada E%sT 1946 104876195Sbrian -5:00 Toronto E%sT 1974 104976195Sbrian -5:00 Canada E%sT 105076195SbrianZone America/Thunder_Bay -5:57:00 - LMT 1895 105176195Sbrian -6:00 - CST 1910 105276195Sbrian -5:00 - EST 1942 105376195Sbrian -5:00 Canada E%sT 1970 105476195Sbrian -5:00 Mont E%sT 1973 105576195Sbrian -5:00 - EST 1974 105676195Sbrian -5:00 Canada E%sT 105776195SbrianZone America/Nipigon -5:53:04 - LMT 1895 105876195Sbrian -5:00 Canada E%sT 1940 Sep 29 105976195Sbrian -5:00 1:00 EDT 1942 Feb 9 2:00s 106076195Sbrian -5:00 Canada E%sT 106176195SbrianZone America/Rainy_River -6:17:56 - LMT 1895 106276195Sbrian -6:00 Canada C%sT 1940 Sep 29 106376195Sbrian -6:00 1:00 CDT 1942 Feb 9 2:00s 106476195Sbrian -6:00 Canada C%sT 106576195Sbrian 106676195Sbrian 106776195Sbrian# Manitoba 106876195Sbrian 106976195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 107076195SbrianRule Winn 1916 only - Apr 23 0:00 1:00 D 107176195SbrianRule Winn 1916 only - Sep 17 0:00 0 S 107276195SbrianRule Winn 1918 only - Apr 14 2:00 1:00 D 107376195SbrianRule Winn 1918 only - Oct 31 2:00 0 S 107476195SbrianRule Winn 1937 only - May 16 2:00 1:00 D 107576195SbrianRule Winn 1937 only - Sep 26 2:00 0 S 107676195SbrianRule Winn 1942 only - Feb 9 2:00 1:00 W # War 107776195SbrianRule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 107876195SbrianRule Winn 1945 only - Sep lastSun 2:00 0 S 107976195SbrianRule Winn 1946 only - May 12 2:00 1:00 D 108076195SbrianRule Winn 1946 only - Oct 13 2:00 0 S 108176195SbrianRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 108276195SbrianRule Winn 1947 1949 - Sep lastSun 2:00 0 S 108376195SbrianRule Winn 1950 only - May 1 2:00 1:00 D 108476195SbrianRule Winn 1950 only - Sep 30 2:00 0 S 108576195SbrianRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 108676195SbrianRule Winn 1951 1958 - Sep lastSun 2:00 0 S 108776195SbrianRule Winn 1959 only - Oct lastSun 2:00 0 S 108876195SbrianRule Winn 1960 only - Sep lastSun 2:00 0 S 108976195SbrianRule Winn 1963 only - Apr lastSun 2:00 1:00 D 109076195SbrianRule Winn 1963 only - Sep 22 2:00 0 S 109176195SbrianRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 109276195SbrianRule Winn 1966 1986 - Oct lastSun 2:00 0 S 109376195SbrianRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 109476195Sbrian# From Paul Eggert (2000-10-02): 109576195Sbrian# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 109676195Sbrian# DST at 03:00 local time. For now, assume it started in 1987. 109776195SbrianRule Winn 1987 max - Oct lastSun 2:00s 0 S 109876195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 109976195SbrianZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 110076195Sbrian -6:00 Winn C%sT 110176195Sbrian 110276195Sbrian 110376195Sbrian# Saskatchewan 110476195Sbrian 110576195Sbrian# From Mark Brader (2003-07-26): 110676195Sbrian# The first actual adoption of DST in Canada was at the municipal 110776195Sbrian# level. As the [Toronto] Star put it (1912-06-07), "While people 110876195Sbrian# elsewhere have long been talking of legislation to save daylight, 110976195Sbrian# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 111076195Sbrian# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 111176195Sbrian# presumably late evening, as below), and would run until "the end of 111276195Sbrian# the summer". The discrepancy between municipal time and railroad 111376195Sbrian# time was noted. 111476195Sbrian 111576195Sbrian# From Paul Eggert (2003-07-27): 111676195Sbrian# Willett (1914-03) notes that DST "has been in operation ... in the 111776195Sbrian# City of Moose Jaw, Saskatchewan, for one year." 111876195Sbrian 111976195Sbrian# From Paul Eggert (2000-10-02): 112076195Sbrian# Shanks writes that since 1970 most of this region has been like Regina. 112176195Sbrian# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 112276195Sbrian# Other western towns (e.g. Lloydminster) are like Edmonton. 112376195Sbrian# Matthews and Vincent (1998) write that Denare Beach and Creighton 112476195Sbrian# are like Winnipeg, in violation of Saskatchewan law. 112576195Sbrian 112676195Sbrian# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 112776195Sbrian# The. . .below is based on information I got from our law library, the 112876195Sbrian# provincial archives, and the provincial Community Services department. 112976195Sbrian# A precise history would require digging through newspaper archives, and 113076195Sbrian# since you didn't say what you wanted, I didn't bother. 113176195Sbrian# 113276195Sbrian# Saskatchewan is split by a time zone meridian (105W) and over the years 113376195Sbrian# the boundary became pretty ragged as communities near it reevaluated 113476195Sbrian# their affiliations in one direction or the other. In 1965 a provincial 113576195Sbrian# referendum favoured legislating common time practices. 113676195Sbrian# 113776195Sbrian# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 113876195Sbrian# Saskatchewan 1978) was proclaimed, and established that the eastern 113976195Sbrian# part of Saskatchewan would use CST year round, that districts in 114076195Sbrian# northwest Saskatchewan would by default follow CST but could opt to 114176195Sbrian# follow Mountain Time rules (thus 1 hour difference in the winter and 114276195Sbrian# zero in the summer), and that districts in southwest Saskatchewan would 114376195Sbrian# by default follow MT but could opt to follow CST. 114476195Sbrian# 114576195Sbrian# It took a few years for the dust to settle (I know one story of a town 114676195Sbrian# on one time zone having its school in another, such that a mom had to 114776195Sbrian# serve her family lunch in two shifts), but presently it seems that only 114876195Sbrian# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 114976195Sbrian# rules any more; all other districts appear to have used CST year round 115076195Sbrian# since sometime in the 1960s. 115176195Sbrian 115276195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 115376195SbrianRule Regina 1918 only - Apr 14 2:00 1:00 D 115476195SbrianRule Regina 1918 only - Oct 31 2:00 0 S 115576195SbrianRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 115676195SbrianRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 115776195SbrianRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 115876195SbrianRule Regina 1937 only - Oct Sun>=8 0:00 0 S 115976195SbrianRule Regina 1938 only - Oct Sun>=1 0:00 0 S 116076195SbrianRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 116176195SbrianRule Regina 1942 only - Feb 9 2:00 1:00 W # War 116276195SbrianRule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 116376195SbrianRule Regina 1945 only - Sep lastSun 2:00 0 S 116476195SbrianRule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 116576195SbrianRule Regina 1946 only - Oct Sun>=8 2:00 0 S 116676195SbrianRule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 116776195SbrianRule Regina 1947 1957 - Sep lastSun 2:00 0 S 116876195SbrianRule Regina 1959 only - Apr lastSun 2:00 1:00 D 116976195SbrianRule Regina 1959 only - Oct lastSun 2:00 0 S 117076195Sbrian# 117176195SbrianRule Swift 1957 only - Apr lastSun 2:00 1:00 D 117276195SbrianRule Swift 1957 only - Oct lastSun 2:00 0 S 117376195SbrianRule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 117476195SbrianRule Swift 1959 only - Oct lastSun 2:00 0 S 117576195SbrianRule Swift 1960 1961 - Sep lastSun 2:00 0 S 117676195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 117776195SbrianZone America/Regina -6:58:36 - LMT 1905 Sep 117876195Sbrian -7:00 Regina M%sT 1960 Apr lastSun 2:00 117976195Sbrian -6:00 - CST 118076195SbrianZone America/Swift_Current -7:11:20 - LMT 1905 Sep 118176195Sbrian -7:00 Canada M%sT 1946 Apr lastSun 2:00 118276195Sbrian -7:00 Regina M%sT 1950 118376195Sbrian -7:00 Swift M%sT 1972 Apr lastSun 2:00 118476195Sbrian -6:00 - CST 118576195Sbrian 118676195Sbrian 118776195Sbrian# Alberta 118876195Sbrian 118976195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 119076195SbrianRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 119176195SbrianRule Edm 1918 only - Oct 31 2:00 0 S 119276195SbrianRule Edm 1919 only - May 27 2:00 0 S 119376195SbrianRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 119476195SbrianRule Edm 1920 only - Oct lastSun 2:00 0 S 119576195SbrianRule Edm 1921 1923 - Sep lastSun 2:00 0 S 119676195SbrianRule Edm 1942 only - Feb 9 2:00 1:00 W # War 119776195SbrianRule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 119876195SbrianRule Edm 1945 only - Sep lastSun 2:00 0 S 119976195SbrianRule Edm 1947 only - Apr lastSun 2:00 1:00 D 120076195SbrianRule Edm 1947 only - Sep lastSun 2:00 0 S 120176195SbrianRule Edm 1967 only - Apr lastSun 2:00 1:00 D 120276195SbrianRule Edm 1967 only - Oct lastSun 2:00 0 S 120376195SbrianRule Edm 1969 only - Apr lastSun 2:00 1:00 D 120476195SbrianRule Edm 1969 only - Oct lastSun 2:00 0 S 120576195SbrianRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 120676195SbrianRule Edm 1972 max - Oct lastSun 2:00 0 S 120776195SbrianRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 120876195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 120976195SbrianZone America/Edmonton -7:33:52 - LMT 1906 Sep 121076195Sbrian -7:00 Edm M%sT 121176195Sbrian 121276195Sbrian 121376195Sbrian# British Columbia 121476195Sbrian 121576195Sbrian# From Paul Eggert (2000-10-02): 121676195Sbrian# Shanks writes that since 1970 most of this region has been like Vancouver. 121776195Sbrian# Dawson Creek uses MST. Much of east BC is like Edmonton. 121876195Sbrian# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 121976195Sbrian 122076195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 122176195SbrianRule Vanc 1918 only - Apr 14 2:00 1:00 D 122276195SbrianRule Vanc 1918 only - Oct 31 2:00 0 S 122376195SbrianRule Vanc 1942 only - Feb 9 2:00 1:00 W # War 122476195SbrianRule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 122576195SbrianRule Vanc 1945 only - Sep 30 2:00 0 S 122676195SbrianRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 122776195SbrianRule Vanc 1946 only - Oct 13 2:00 0 S 122876195SbrianRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 122976195SbrianRule Vanc 1962 max - Oct lastSun 2:00 0 S 123076195SbrianRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 123176195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 123276195SbrianZone America/Vancouver -8:12:28 - LMT 1884 123376195Sbrian -8:00 Vanc P%sT 123476195SbrianZone America/Dawson_Creek -8:00:56 - LMT 1884 123576195Sbrian -8:00 Canada P%sT 1947 123676195Sbrian -8:00 Vanc P%sT 1972 Aug 30 2:00 123776195Sbrian -7:00 - MST 123876195Sbrian 123976195Sbrian 124076195Sbrian# Northwest Territories, Nunavut, Yukon 124176195Sbrian 124276195Sbrian# From Paul Eggert (1999-10-29): 124376195Sbrian# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 124476195Sbrian# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 124576195Sbrian# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 124676195Sbrian# c. 7 defines Yukon standard time as UTC-9. This is still valid; 124776195Sbrian# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 124876195Sbrian# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 124976195Sbrian# * O.I.C. 1980/02 established DST. 125076195Sbrian# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 125176195Sbrian# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 125276195Sbrian 125376195Sbrian# From Rives McDow (1999-09-04): 125476195Sbrian# Nunavut ... moved ... to incorporate the whole territory into one time zone. 125576195Sbrian# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 125676195Sbrian# Nunavut moves to single time zone Oct. 31 125776195Sbrian# </a> 125876195Sbrian# 125976195Sbrian# From Antoine Leca (1999-09-06): 126076195Sbrian# We then need to create a new timezone for the Kitikmeot region of Nunavut 126176195Sbrian# to differentiate it from the Yellowknife region. 126276195Sbrian 126376195Sbrian# From Paul Eggert (1999-09-20): 126476195Sbrian# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 126576195Sbrian# Basic Facts: The New Territory 126676195Sbrian# </a> (1999) reports that Pangnirtung operates on eastern time, 126776195Sbrian# and that Coral Harbour does not observe DST. We don't know when 126876195Sbrian# Pangnirtung switched to eastern time; we'll guess 1995. 126976195Sbrian# We'll ignore the claim about Coral Harbour for now, 127076195Sbrian# since we have no further info. 127176195Sbrian 127276195Sbrian# From Rives McDow (1999-11-08): 127376195Sbrian# On October 31, when the rest of Nunavut went to Central time, 127476195Sbrian# Pangnirtung wobbled. Here is the result of their wobble: 127576195Sbrian# 127676195Sbrian# The following businesses and organizations in Pangnirtung use Central Time: 127776195Sbrian# 127876195Sbrian# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 127976195Sbrian# Eastern Arctic National Parks, A & D Specialist 128076195Sbrian# 128176195Sbrian# The following businesses and organizations in Pangnirtung use Eastern Time: 128276195Sbrian# 128376195Sbrian# Hamlet office, All other businesses, Both schools, Airport operator 128476195Sbrian# 128576195Sbrian# This has made for an interesting situation there, which warranted the news. 128676195Sbrian# No one there that I spoke with seems concerned, or has plans to 128776195Sbrian# change the local methods of keeping time, as it evidently does not 128876195Sbrian# really interfere with any activities or make things difficult locally. 128976195Sbrian# They plan to celebrate New Year's turn-over twice, one hour apart, 129076195Sbrian# so it appears that the situation will last at least that long. 129176195Sbrian# The Nunavut Intergovernmental Affairs hopes that they will "come to 129276195Sbrian# their senses", but the locals evidently don't see any problem with 129376195Sbrian# the current state of affairs. 129476195Sbrian 129576195Sbrian# From Michaela Rodrigue, writing in the 129676195Sbrian# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 129776195Sbrian# Nunatsiaq News (1999-11-19)</a>: 129876195Sbrian# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 129976195Sbrian# central - or Nunavut time - for government offices, and eastern time 130076195Sbrian# for municipal offices and schools.... Igloolik [was similar but then] 130176195Sbrian# made the switch to central time on Saturday, Nov. 6. 130276195Sbrian 130376195Sbrian# From Paul Eggert (2000-10-02): 130476195Sbrian# Matthews and Vincent (1998) say the following, but we lack histories 130576195Sbrian# for these potential new Zones. 130676195Sbrian# 130776195Sbrian# The Canadian Forces station at Alert uses Eastern Time while the 130876195Sbrian# handful of residents at the Eureka weather station [in the Central 130976195Sbrian# zone] skip daylight savings. Baffin Island, which is crossed by the 131076195Sbrian# Central, Eastern and Atlantic Time zones only uses Eastern Time. 131176195Sbrian# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 131276195Sbrian# Central Time and Southampton Island [in the Central zone] is not 131376195Sbrian# required to use daylight savings. 131476195Sbrian 131576195Sbrian# From 131676195Sbrian# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 131776195Sbrian# Nunavut now has two time zones 131876195Sbrian# </a> (2000-11-10): 131976195Sbrian# The Nunavut government would allow its employees in Kugluktuk and 132076195Sbrian# Cambridge Bay to operate on central time year-round, putting them 132176195Sbrian# one hour behind the rest of Nunavut for six months during the winter. 132276195Sbrian# At the end of October the two communities had rebelled against 132376195Sbrian# Nunavut's unified time zone, refusing to shift to eastern time with 132476195Sbrian# the rest of the territory for the winter. Cambridge Bay remained on 132576195Sbrian# central time, while Kugluktuk, even farther west, reverted to 132676195Sbrian# mountain time, which they had used before the advent of Nunavut's 132776195Sbrian# unified time zone in 1999. 132876195Sbrian# 132976195Sbrian# From Rives McDow (2001-01-20), quoting the Nunavut government: 133076195Sbrian# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 133176195Sbrian 133276195Sbrian# From Paul Eggert (2000-12-04): 133376195Sbrian# Let's just keep track of the official times for now. 133476195Sbrian 133576195Sbrian# From Rives McDow (2001-03-07): 133676195Sbrian# The premier of Nunavut has issued a ministerial statement advising 133776195Sbrian# that effective 2001-04-01, the territory of Nunavut will revert 133876195Sbrian# back to three time zones (mountain, central, and eastern). Of the 133976195Sbrian# cities in Nunavut, Coral Harbor is the only one that I know of that 134076195Sbrian# has said it will not observe dst, staying on EST year round. I'm 134176195Sbrian# checking for more info, and will get back to you if I come up with 134276195Sbrian# more. 134376195Sbrian# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 134476195Sbrian 134576195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 134676195SbrianRule NT_YK 1918 only - Apr 14 2:00 1:00 D 134776195SbrianRule NT_YK 1918 only - Oct 27 2:00 0 S 134876195SbrianRule NT_YK 1919 only - May 25 2:00 1:00 D 134976195SbrianRule NT_YK 1919 only - Nov 1 0:00 0 S 135076195SbrianRule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 135176195SbrianRule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 135276195SbrianRule NT_YK 1945 only - Sep 30 2:00 0 S 135376195SbrianRule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 135476195SbrianRule NT_YK 1965 only - Oct lastSun 2:00 0 S 135576195SbrianRule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 135676195SbrianRule NT_YK 1980 max - Oct lastSun 2:00 0 S 135776195SbrianRule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 135876195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 135976195SbrianZone America/Pangnirtung -4:22:56 - LMT 1884 136076195Sbrian -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 136176195Sbrian -5:00 Canada E%sT 1999 Oct 31 2:00 136276195Sbrian -6:00 Canada C%sT 2000 Oct 29 2:00 136376195Sbrian -5:00 Canada E%sT 136476195SbrianZone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 136576195Sbrian -5:00 NT_YK E%sT 1999 Oct 31 2:00 136676195Sbrian -6:00 Canada C%sT 2000 Oct 29 2:00 136776195Sbrian -5:00 Canada E%sT 136876195SbrianZone America/Rankin_Inlet -6:08:40 - LMT 1884 136976195Sbrian -6:00 NT_YK C%sT 2000 Oct 29 2:00 137076195Sbrian -5:00 - EST 2001 Apr 1 3:00 137176195Sbrian -6:00 Canada C%sT 137276195SbrianZone America/Cambridge_Bay -7:00:20 - LMT 1884 137376195Sbrian -7:00 NT_YK M%sT 1999 Oct 31 2:00 137476195Sbrian -6:00 Canada C%sT 2000 Oct 29 2:00 137576195Sbrian -5:00 - EST 2000 Nov 5 0:00 137676195Sbrian -6:00 - CST 2001 Apr 1 3:00 137776195Sbrian -7:00 Canada M%sT 137876195SbrianZone America/Yellowknife -7:37:24 - LMT 1884 137976195Sbrian -7:00 NT_YK M%sT 138076195SbrianZone America/Inuvik -8:54:00 - LMT 1884 138176195Sbrian -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 138276195Sbrian -7:00 NT_YK M%sT 138376195SbrianZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 138476195Sbrian -9:00 NT_YK Y%sT 1966 Jul 1 2:00 138576195Sbrian -8:00 NT_YK P%sT 138676195SbrianZone America/Dawson -9:17:40 - LMT 1900 Aug 20 138776195Sbrian -9:00 NT_YK Y%sT 1973 Oct 28 0:00 138876195Sbrian -8:00 NT_YK P%sT 138976195Sbrian 139076195Sbrian 139176195Sbrian############################################################################### 139276195Sbrian 139376195Sbrian# Mexico 139476195Sbrian 139576195Sbrian# From Paul Eggert (2001-03-05): 139676195Sbrian# The Investigation and Analysis Service of the 139776195Sbrian# Mexican Library of Congress (MLoC) has published a 139876195Sbrian# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 139976195Sbrian# history of Mexican local time (in Spanish) 140076195Sbrian# </a>. 140176195Sbrian# 140276195Sbrian# Here are the discrepancies between Shanks and the MLoC. 140376195Sbrian# (In all cases we go with the MLoC.) 140476195Sbrian# Shanks reports that Baja was at -8:00 in 1922/1923. 140576195Sbrian# Shanks says the 1930 transition in Baja was 1930-11-16. 140676195Sbrian# Shanks reports no DST during summer 1931. 140776195Sbrian# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. 140876195Sbrian# Shanks does not report transitions for Baja in 1945 or 1948. 140976195Sbrian# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 141076195Sbrian# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 141176195Sbrian# on 1997-10-26 at 02:00. 141276195Sbrian 141376195Sbrian# From Gwillim Law (2001-02-20): 141476195Sbrian# There are some other discrepancies between the Decrees page and the 141576195Sbrian# tz database. I think they can best be explained by supposing that 141676195Sbrian# the researchers who prepared the Decrees page failed to find some of 141776195Sbrian# the relevant documents. 141876195Sbrian 141976195Sbrian# From Paul Eggert (2000-07-26): 142076195Sbrian# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 142176195Sbrian# and 1988 DST experiments. Go with spin.com.mx. 142276195Sbrian 142376195Sbrian# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 142476195Sbrian# A guy from our Mexico subsidiary finally found the Presidential Decree 142576195Sbrian# outlining the timezone changes in Mexico. 142676195Sbrian# 142776195Sbrian# ------------- Begin Forwarded Message ------------- 142876195Sbrian# 142976195Sbrian# I finally got my hands on the Official Presidential Decree that sets up the 143076195Sbrian# rules for the DST changes. The rules are: 143176195Sbrian# 143276195Sbrian# 1. The country is divided in 3 timezones: 143376195Sbrian# - Baja California Norte (the Mexico/BajaNorte TZ) 143476195Sbrian# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 143576195Sbrian# - The rest of the country (the Mexico/General TZ) 143676195Sbrian# 143776195Sbrian# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 143876195Sbrian# at 2:00 AM, the times in each zone are as follows: 143976195Sbrian# BajaNorte: GMT+7 144076195Sbrian# BajaSur: GMT+6 144176195Sbrian# General: GMT+5 144276195Sbrian# 144376195Sbrian# 3. The rest of the year, the times are as follows: 144476195Sbrian# BajaNorte: GMT+8 144576195Sbrian# BajaSur: GMT+7 144676195Sbrian# General: GMT+6 144776195Sbrian# 144876195Sbrian# The Decree was published in Mexico's Official Newspaper on January 4th. 144976195Sbrian# 145076195Sbrian# -------------- End Forwarded Message -------------- 145176195Sbrian# From Paul Eggert (1996-06-12): 145276195Sbrian# For an English translation of the decree, see 145376195Sbrian# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 145476195Sbrian# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 145576195Sbrian# </a> 145676195Sbrian 145776195Sbrian# From Rives McDow (1998-10-08): 145876195Sbrian# The State of Quintana Roo has reverted back to central STD and DST times 145976195Sbrian# (i.e. UTC -0600 and -0500 as of 1998-08-02). 146076195Sbrian 146176195Sbrian# From Rives McDow (2000-01-10): 146276195Sbrian# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 146376195Sbrian# zone 5 hours from the International Date Line, and will not observe daylight 146476195Sbrian# savings time so as to stay on the same time zone as the southern part of 146576195Sbrian# Arizona year round. 146676195Sbrian 146776195Sbrian# From Jesper Norgaard, translating 146876195Sbrian# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 146976195Sbrian# In Oaxaca, the 55.000 teachers from the Section 22 of the National 147076195Sbrian# Syndicate of Education Workers, refuse to apply daylight saving each 147176195Sbrian# year, so that the more than 10,000 schools work at normal hour the 147276195Sbrian# whole year. 147376195Sbrian 147476195Sbrian# From Gwillim Law (2001-01-19): 147576195Sbrian# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 147676195Sbrian# (translated):... 147776195Sbrian# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 147876195Sbrian# that Summer Time will be reduced from seven to five months, starting 147976195Sbrian# this year.... 148076195Sbrian# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 148176195Sbrian# [translated], says "summer time will ... take effect on the first Sunday 148276195Sbrian# in May, and end on the last Sunday of September. 148376195Sbrian 148476195Sbrian# From Arthur David Olson (2001-01-25): 148576195Sbrian# The 2001-01-24 traditional Washington Post contained the page one 148676195Sbrian# story "Timely Issue Divides Mexicans."... 148776195Sbrian# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 148876195Sbrian# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 148976195Sbrian# Mexico City and its 20 million residents on a different time than 149076195Sbrian# the rest of the country..." In particular, Lopez Obrador would abolish 149176195Sbrian# observation of Daylight Saving Time. 149276195Sbrian 149376195Sbrian# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 149476195Sbrian# Official statute published by the Energy Department 149576195Sbrian# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 149676195Sbrian# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 149776195Sbrian 149876195Sbrian# From Paul Eggert (2001-03-03): 149976195Sbrian# 150076195Sbrian# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 150176195Sbrian# James F. Smith writes in today's LA Times 150276195Sbrian# </a> 150376195Sbrian# * Sonora will continue to observe standard time. 150476195Sbrian# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 150576195Sbrian# the Federal District will not adopt DST. 150676195Sbrian# * 4 of 16 district leaders announced they'll ignore the decree. 150776195Sbrian# * The decree does not affect federal-controlled facilities including 150876195Sbrian# the airport, banks, hospitals, and schools. 150976195Sbrian# 151076195Sbrian# For now we'll assume that the Federal District will bow to federal rules. 151176195Sbrian 151276195Sbrian# From Jesper Norgaard (2001-04-01): 151376195Sbrian# I found some references to the Mexican application of daylight 151476195Sbrian# saving, which modifies what I had already sent you, stating earlier 151576195Sbrian# that a number of northern Mexican states would go on daylight 151676195Sbrian# saving. The modification reverts this to only cover Baja California 151776195Sbrian# (Norte), while all other states (except Sonora, who has no daylight 151876195Sbrian# saving all year) will follow the original decree of president 151976195Sbrian# Vicente Fox, starting daylight saving May 6, 2001 and ending 152076195Sbrian# September 30, 2001. 152176195Sbrian# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 152276195Sbrian# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 152376195Sbrian 152476195Sbrian# From Reuters (2001-09-04): 152576195Sbrian# Mexico's Supreme Court on Tuesday declared that daylight savings was 152676195Sbrian# unconstitutional in Mexico City, creating the possibility the 152776195Sbrian# capital will be in a different time zone from the rest of the nation 152876195Sbrian# next year.... The Supreme Court's ruling takes effect at 2:00 152976195Sbrian# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 153076195Sbrian# standard time. "This is so residents of the Federal District are not 153176195Sbrian# subject to unexpected time changes," a statement from the court said. 153276195Sbrian 153376195Sbrian# From Jesper Norgaard Welen (2002-03-12): 153476195Sbrian# ... consulting my local grocery store(!) and my coworkers, they all insisted 153576195Sbrian# that a new decision had been made to reinstate US style DST in Mexico.... 153676195Sbrian# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 153776195Sbrian# confirms this. Sonora as usual is the only state where DST is not applied. 153876195Sbrian 153976195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 154076195SbrianRule Mexico 1939 only - Feb 5 0:00 1:00 D 154176195SbrianRule Mexico 1939 only - Jun 25 0:00 0 S 154276195SbrianRule Mexico 1940 only - Dec 9 0:00 1:00 D 154376195SbrianRule Mexico 1941 only - Apr 1 0:00 0 S 154476195SbrianRule Mexico 1943 only - Dec 16 0:00 1:00 W # War 154576195SbrianRule Mexico 1944 only - May 1 0:00 0 S 154676195SbrianRule Mexico 1950 only - Feb 12 0:00 1:00 D 154776195SbrianRule Mexico 1950 only - Jul 30 0:00 0 S 154876195SbrianRule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 154976195SbrianRule Mexico 1996 2000 - Oct lastSun 2:00 0 S 155076195SbrianRule Mexico 2001 only - May Sun>=1 2:00 1:00 D 155176195SbrianRule Mexico 2001 only - Sep lastSun 2:00 0 S 155276195SbrianRule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 155376195SbrianRule Mexico 2002 max - Oct lastSun 2:00 0 S 155476195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 155576195Sbrian# Quintana Roo 155676195SbrianZone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 155776195Sbrian -6:00 - CST 1981 Dec 23 155876195Sbrian -5:00 Mexico E%sT 1998 Aug 2 2:00 155976195Sbrian -6:00 Mexico C%sT 156076195Sbrian# Campeche, Yucatan 156176195SbrianZone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 156276195Sbrian -6:00 - CST 1981 Dec 23 156376195Sbrian -5:00 - EST 1982 Dec 2 156476195Sbrian -6:00 Mexico C%sT 156576195Sbrian# Coahuila, Durango, Nuevo Leon, Tamaulipas 156676195SbrianZone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 156776195Sbrian -6:00 - CST 1988 156876195Sbrian -6:00 US C%sT 1989 156976195Sbrian -6:00 Mexico C%sT 157076195Sbrian# Central Mexico 157176195SbrianZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 157276195Sbrian -7:00 - MST 1927 Jun 10 23:00 157376195Sbrian -6:00 - CST 1930 Nov 15 157476195Sbrian -7:00 - MST 1931 May 1 23:00 157576195Sbrian -6:00 - CST 1931 Oct 157676195Sbrian -7:00 - MST 1932 Apr 1 157776195Sbrian -6:00 Mexico C%sT 2001 Sep 30 02:00 157876195Sbrian -6:00 - CST 2002 Feb 20 157976195Sbrian -6:00 Mexico C%sT 158076195Sbrian# Chihuahua 158176195SbrianZone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 158276195Sbrian -7:00 - MST 1927 Jun 10 23:00 158376195Sbrian -6:00 - CST 1930 Nov 15 158476195Sbrian -7:00 - MST 1931 May 1 23:00 158576195Sbrian -6:00 - CST 1931 Oct 158676195Sbrian -7:00 - MST 1932 Apr 1 158776195Sbrian -6:00 - CST 1996 158876195Sbrian -6:00 Mexico C%sT 1998 158976195Sbrian -6:00 - CST 1998 Apr Sun>=1 3:00 159076195Sbrian -7:00 Mexico M%sT 159176195Sbrian# Sonora 159276195SbrianZone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 159376195Sbrian -7:00 - MST 1927 Jun 10 23:00 159476195Sbrian -6:00 - CST 1930 Nov 15 159576195Sbrian -7:00 - MST 1931 May 1 23:00 159676195Sbrian -6:00 - CST 1931 Oct 159776195Sbrian -7:00 - MST 1932 Apr 1 159876195Sbrian -6:00 - CST 1942 Apr 24 159976195Sbrian -7:00 - MST 1949 Jan 14 160076195Sbrian -8:00 - PST 1970 160176195Sbrian -7:00 Mexico M%sT 1999 160276195Sbrian -7:00 - MST 160376195Sbrian# Baja California Sur, Nayarit, Sinaloa 160476195SbrianZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 160576195Sbrian -7:00 - MST 1927 Jun 10 23:00 160676195Sbrian -6:00 - CST 1930 Nov 15 160776195Sbrian -7:00 - MST 1931 May 1 23:00 160876195Sbrian -6:00 - CST 1931 Oct 160976195Sbrian -7:00 - MST 1932 Apr 1 161076195Sbrian -6:00 - CST 1942 Apr 24 161176195Sbrian -7:00 - MST 1949 Jan 14 161276195Sbrian -8:00 - PST 1970 161376195Sbrian -7:00 Mexico M%sT 161476195Sbrian# Baja California 161576195SbrianZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 161676195Sbrian -7:00 - MST 1924 161776195Sbrian -8:00 - PST 1927 Jun 10 23:00 161876195Sbrian -7:00 - MST 1930 Nov 15 161976195Sbrian -8:00 - PST 1931 Apr 1 162076195Sbrian -8:00 1:00 PDT 1931 Sep 30 162176195Sbrian -8:00 - PST 1942 Apr 24 162276195Sbrian -8:00 1:00 PWT 1945 Nov 12 162376195Sbrian -8:00 - PST 1948 Apr 5 162476195Sbrian -8:00 1:00 PDT 1949 Jan 14 162576195Sbrian -8:00 - PST 1954 162676195Sbrian -8:00 CA P%sT 1961 162776195Sbrian -8:00 - PST 1976 162876195Sbrian -8:00 US P%sT 1996 162976195Sbrian -8:00 Mexico P%sT 2001 163076195Sbrian -8:00 US P%sT 2002 Feb 20 163176195Sbrian -8:00 Mexico P%sT 163276195Sbrian# From Paul Eggert (2001-03-05): 163376195Sbrian# Formerly there was an America/Ensenada zone, which differed from 163476195Sbrian# America/Tijuana only in that it did not observe DST from 1976 163576195Sbrian# through 1995. This was as per Shanks. However, Guy Harris reports 163676195Sbrian# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 163776195Sbrian# Tijuana observe DST," which contradicts Shanks but does imply that 163876195Sbrian# DST-observance was a town-by-town matter back then. This concerns 163976195Sbrian# data after 1970 so most likely there should be at least one Zone 164076195Sbrian# other than America/Tijuana for Baja, but it's not clear yet what its 164176195Sbrian# name or contents should be. 164276195Sbrian# 164376195Sbrian# Revillagigedo Is 164476195Sbrian# no information 164576195Sbrian 164676195Sbrian############################################################################### 164776195Sbrian 164876195Sbrian# Anguilla 164976195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 165076195SbrianZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 165176195Sbrian -4:00 - AST 165276195Sbrian 165376195Sbrian# Antigua and Barbuda 165476195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 165576195SbrianZone America/Antigua -4:07:12 - LMT 1912 Mar 2 165676195Sbrian -5:00 - EST 1951 165776195Sbrian -4:00 - AST 165876195Sbrian 165976195Sbrian# Bahamas 166076195Sbrian# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 166176195SbrianRule Bahamas 1964 max - Oct lastSun 2:00 0 S 166276195SbrianRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 166376195SbrianRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 166476195Sbrian# Zone NAME GMTOFF RULES FORMAT [UNTIL] 166576195SbrianZone America/Nassau -5:09:24 - LMT 1912 Mar 2 1666 -5:00 Bahamas E%sT 1667 1668# Barbados 1669# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1670Rule Barb 1977 only - Jun 12 2:00 1:00 D 1671Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1672Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1673Rule Barb 1979 only - Sep 30 2:00 0 S 1674Rule Barb 1980 only - Sep 25 2:00 0 S 1675# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1676Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1677 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1678 -4:00 Barb A%sT 1679 1680# Belize 1681# Whitman entirely disagrees with Shanks; go with Shanks. 1682# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1683Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1684Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1685Rule Belize 1973 only - Dec 5 0:00 1:00 D 1686Rule Belize 1974 only - Feb 9 0:00 0 S 1687Rule Belize 1982 only - Dec 18 0:00 1:00 D 1688Rule Belize 1983 only - Feb 12 0:00 0 S 1689# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1690Zone America/Belize -5:52:48 - LMT 1912 Apr 1691 -6:00 Belize C%sT 1692 1693# Bermuda 1694# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1695Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1696 -4:00 - AST 1974 Apr 28 2:00 1697 -4:00 Bahamas A%sT 1698 1699# Cayman Is 1700# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1701Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1702 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1703 -5:00 - EST 1704 1705# Costa Rica 1706# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1707Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1708Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1709Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1710# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1711Rule CR 1991 only - Jul 1 0:00 0 S 1712Rule CR 1992 only - Mar 15 0:00 0 S 1713# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1714# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1715Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1716 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1717 -6:00 CR C%sT 1718# Coco 1719# no information; probably like America/Costa_Rica 1720 1721# Cuba 1722 1723# From Arthur David Olson (1999-03-29): 1724# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1725# the Cuban National Team and the Baltimore Orioles was carried live on 1726# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1727# During the game, play-by-play announcer Jim Hunter noted that 1728# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1729# Time today." (The "two hour" remark referred to losing one hour of 1730# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1731# to DST--and one more hour on 1999-04-04--when the announcers will have 1732# returned to Baltimore, which switches on that date.) 1733 1734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1735Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1736Rule Cuba 1928 only - Oct 10 0:00 0 S 1737Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1738Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1739Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1740Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1741Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1742Rule Cuba 1965 only - Sep 30 0:00 0 S 1743Rule Cuba 1966 only - May 29 0:00 1:00 D 1744Rule Cuba 1966 only - Oct 2 0:00 0 S 1745Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1746Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1747Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1748Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1749Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1750Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1751Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1752Rule Cuba 1978 only - May 7 0:00 1:00 D 1753Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1754Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1755Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1756Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1757Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1758Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1759Rule Cuba 1996 only - Oct 6 0:00s 0 S 1760Rule Cuba 1997 only - Oct 12 0:00s 0 S 1761Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1762Rule Cuba 1998 max - Oct lastSun 0:00s 0 S 1763Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1764 1765# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1766Zone America/Havana -5:29:28 - LMT 1890 1767 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1768 -5:00 Cuba C%sT 1769 1770# Dominica 1771# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1772Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1773 -4:00 - AST 1774 1775# Dominican Republic 1776 1777# From Steffen Thorsen (2000-10-30): 1778# Enrique Morales reported to me that the Dominican Republic has changed the 1779# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1780# http://www.listin.com.do/antes/261000/republica/princi.html 1781 1782# From Paul Eggert (2000-12-04): 1783# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1784 1785# From Rives McDow (2000-12-01): 1786# Dominican Republic changed its mind and presidential decree on Tuesday, 1787# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1788# Dominican Republic will be reverting to 8 hours from the International Date 1789# Line, and will not be using DST in the foreseeable future. The reason they 1790# decided to use DST was to be in synch with Puerto Rico, who was also going 1791# to implement DST. When Puerto Rico didn't implement DST, the president 1792# decided to revert. 1793 1794 1795# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1796Rule DR 1966 only - Oct 30 0:00 1:00 D 1797Rule DR 1967 only - Feb 28 0:00 0 S 1798Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1799Rule DR 1970 only - Feb 21 0:00 0 S 1800Rule DR 1971 only - Jan 20 0:00 0 S 1801Rule DR 1972 1974 - Jan 21 0:00 0 S 1802# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1803Zone America/Santo_Domingo -4:39:36 - LMT 1890 1804 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1805 -5:00 DR E%sT 1974 Oct 27 1806 -4:00 - AST 2000 Oct 29 02:00 1807 -5:00 US E%sT 2000 Dec 3 01:00 1808 -4:00 - AST 1809 1810# El Salvador 1811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1812Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1813Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1814# There are too many San Salvadors elsewhere, so use America/El_Salvador 1815# instead of America/San_Salvador. 1816# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1817Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1818 -6:00 Salv C%sT 1819 1820# Grenada 1821# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1822Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1823 -4:00 - AST 1824 1825# Guadeloupe 1826# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1827Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1828 -4:00 - AST 1829 1830# Guatemala 1831# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1832Rule Guat 1973 only - Nov 25 0:00 1:00 D 1833Rule Guat 1974 only - Feb 24 0:00 0 S 1834Rule Guat 1983 only - May 21 0:00 1:00 D 1835Rule Guat 1983 only - Sep 22 0:00 0 S 1836Rule Guat 1991 only - Mar 23 0:00 1:00 D 1837Rule Guat 1991 only - Sep 7 0:00 0 S 1838# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1839Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1840 -6:00 Guat C%sT 1841 1842# Haiti 1843# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1844Rule Haiti 1983 only - May 8 0:00 1:00 D 1845Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1846Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1847# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1848Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1849Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1850# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1851Zone America/Port-au-Prince -4:49:20 - LMT 1890 1852 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1853 -5:00 Haiti E%sT 1854 1855# Honduras 1856# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1857# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1858Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1859 -6:00 Salv C%sT 1860# 1861# Great Swan I ceded by US to Honduras in 1972 1862 1863# Jamaica 1864 1865# From Bob Devine (1988-01-28): 1866# Follows US rules. 1867 1868# From U. S. Naval Observatory (1989-01-19): 1869# JAMAICA 5 H BEHIND UTC 1870 1871# From Shanks: 1872# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1873Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1874 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1875 -5:00 - EST 1974 Apr 28 2:00 1876 -5:00 US E%sT 1984 1877 -5:00 - EST 1878 1879# Martinique 1880# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1881Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1882 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1883 -4:00 - AST 1980 Apr 6 1884 -4:00 1:00 ADT 1980 Sep 28 1885 -4:00 - AST 1886 1887# Montserrat 1888# From Paul Eggert (1997-08-31): 1889# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1890# Luckily, Olveston, the current de facto capital, has the same longitude. 1891# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1892Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1893 -4:00 - AST 1894 1895# Nicaragua 1896# 1897# From Steffen Thorsen (1998-12-29): 1898# Nicaragua seems to be back at -6:00 but I have not been able to find when 1899# they changed from -5:00. 1900# 1901# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1902Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1903Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1904Rule Nic 1992 only - Jan 1 4:00 1:00 D 1905Rule Nic 1992 only - Sep 24 0:00 0 S 1906# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1907Zone America/Managua -5:45:08 - LMT 1890 1908 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 1909 -6:00 - CST 1973 May 1910 -5:00 - EST 1975 Feb 16 1911 -6:00 Nic C%sT 1993 Jan 1 4:00 1912 -5:00 - EST 1998 Dec 1913 -6:00 - CST 1914 1915# Panama 1916# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1917Zone America/Panama -5:18:08 - LMT 1890 1918 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 1919 -5:00 - EST 1920 1921# Puerto Rico 1922# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1923# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1924Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1925 -4:00 - AST 1942 May 3 1926 -4:00 1:00 AWT 1945 Sep 30 2:00 1927 -4:00 - AST 1928 1929# St Kitts-Nevis 1930# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1931Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1932 -4:00 - AST 1933 1934# St Lucia 1935# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1936Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1937 -4:04:00 - CMT 1912 # Castries Mean Time 1938 -4:00 - AST 1939 1940# St Pierre and Miquelon 1941# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1942# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1943Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1944 -4:00 - AST 1980 May 1945 -3:00 - PMST 1987 # Pierre & Miquelon Time 1946 -3:00 Canada PM%sT 1947 1948# St Vincent and the Grenadines 1949# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1950Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1951 -4:04:56 - KMT 1912 # Kingstown Mean Time 1952 -4:00 - AST 1953 1954# Turks and Caicos 1955# From Paul Eggert (1998-08-06): 1956# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 1957# says they switch at midnight. Go with IATA SSIM. 1958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1959Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 1960Rule TC 1979 max - Oct lastSun 0:00 0 S 1961Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 1962# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1963Zone America/Grand_Turk -4:44:32 - LMT 1890 1964 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1965 -5:00 TC E%sT 1966 1967# British Virgin Is 1968# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1969Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1970 -4:00 - AST 1971 1972# Virgin Is 1973# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1974Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1975 -4:00 - AST 1976