northamerica revision 14343
114343Swollman# @(#)northamerica 7.22 22742Swollman# also includes Central America and the Caribbean 32742Swollman 42742Swollman# This data is by no means authoritative; if you think you know better, 52742Swollman# go ahead and edit the file (and please send any changes to 62742Swollman# tz@elsie.nci.nih.gov for general use in the future). 72742Swollman 82742Swollman# From Paul Eggert <eggert@twinsun.com> (August 17, 1994): 92742Swollman# A reliable and entertaining source about time zones is 102742Swollman# Derek Howse, Greenwich time and the discovery of the longitude, 112742Swollman# Oxford University Press (1980). 122742Swollman 132742Swollman############################################################################### 142742Swollman 152742Swollman# United States 162742Swollman 1714343Swollman# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 1814343Swollman# A good source for time zone historical data in the US is 1914343Swollman# Thomas G. Shanks, The American Atlas (5th edition), 2014343Swollman# San Diego: ACS Publications, Inc. (1991). 2114343Swollman# Make sure you have the errata sheet; the book is somewhat useless without it. 2214343Swollman# It is the source for the US and Puerto Rico entries below. 2314343Swollman 242742Swollman# From Arthur David Olson: 252742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 262742Swollman# See, for example, the front page of the Saturday, October 26, 1974 272742Swollman# and Sunday, October 27, 1974 editions of the Washington Post. 282742Swollman 292742Swollman# From Arthur David Olson: 302742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 312742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 322742Swollman 332742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3414343SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 352742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 362742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 372742SwollmanRule US 1945 only - Sep 30 2:00 0 S 382742SwollmanRule US 1967 max - Oct lastSun 2:00 0 S 392742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 402742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 412742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 422742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 432742SwollmanRule US 1987 max - Apr Sun>=1 2:00 1:00 D 442742Swollman 452742Swollman# From Bob Devine (January 28, 1988): 462742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 472742Swollman# old new 482742Swollman# Pacific Standard Time(PST) -same- 492742Swollman# Yukon Standard Time(YST) -same- 502742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 512742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 522742Swollman# 532742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 542742Swollman# The YST zone now covers nearly all of the state, AHST just part 552742Swollman# of the Aleutian islands. No DST. 562742Swollman 5714343Swollman# From Paul Eggert (1995-12-19): 5814343Swollman# The tables below use `NST', not `NT', for Nome Standard Time. 5914343Swollman# I invented `CAWT' for Central Alaska War Time. 6014343Swollman 612742Swollman# From U. S. Naval Observatory (January 19, 1989): 622742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 632742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 642742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 652742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 662742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 672742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 682742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 692742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 702742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 712742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 722742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 732742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 742742Swollman# USA HAWAII 10 H BEHIND UTC 752742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 762742Swollman 772742Swollman# From Arthur David Olson (January 21, 1989): 782742Swollman# The above dates are for 1988. 792742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 802742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 812742Swollman# Aleutians. 822742Swollman 832742Swollman# From Arthur David Olson (February 13, 1988): 842742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 852742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 862742Swollman# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 872742Swollman# took effect), as explained in sections 263 and 261: 882742Swollman# (none) 892742Swollman# United States standard eastern time 902742Swollman# United States standard mountain time 912742Swollman# United States standard central time 922742Swollman# United States standard Pacific time 932742Swollman# (none) 942742Swollman# United States standard Alaska time 952742Swollman# (none) 962742Swollman# Next, names from April 1, 1967 until November 30, 1983 (the date for 972742Swollman# public law 98-181): 982742Swollman# Atlantic standard time 992742Swollman# eastern standard time 1002742Swollman# central standard time 1012742Swollman# mountain standard time 1022742Swollman# Pacific standard time 1032742Swollman# Yukon standard time 1042742Swollman# Alaska-Hawaii standard time 1052742Swollman# Bering standard time 1062742Swollman# And after November 30, 1983: 1072742Swollman# Atlantic standard time 1082742Swollman# eastern standard time 1092742Swollman# central standard time 1102742Swollman# mountain standard time 1112742Swollman# Pacific standard time 1122742Swollman# Alaska standard time 1132742Swollman# Hawaii-Aleutian standard time 1142742Swollman# Samoa standard time 1152742Swollman# The law doesn't give abbreviations. 11614343Swollman# 11714343Swollman# From Paul Eggert (1995-12-19): 11814343Swollman# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 11914343Swollman# Go with Shanks. 1202742Swollman 12114343Swollman# US Eastern time, represented by New York 12214343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 12314343SwollmanRule NYC 1920 only - Mar lastSun 2:00 1:00 D 12414343SwollmanRule NYC 1920 only - Oct lastSun 2:00 0 S 12514343SwollmanRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 12614343SwollmanRule NYC 1921 1954 - Sep lastSun 2:00 0 S 12714343SwollmanRule NYC 1955 1966 - Oct lastSun 2:00 0 S 12814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12914343SwollmanZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 13014343Swollman -5:00 US E%sT 1920 13114343Swollman -5:00 NYC E%sT 1942 13214343Swollman -5:00 US E%sT 1946 13314343Swollman -5:00 NYC E%sT 1967 13414343Swollman -5:00 US E%sT 13514343Swollman# ZONE-DESCR America New_York United_States Eastern time (except IN, KY, MI) 1362742Swollman 13714343Swollman# US Central time, represented by Chicago 13814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 13914343SwollmanRule Chicago 1920 only - Jun 13 2:00 1:00 D 14014343SwollmanRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 14114343SwollmanRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 14214343SwollmanRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 14314343SwollmanRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 14414343SwollmanRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 14514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14614343SwollmanZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 14714343Swollman -6:00 US C%sT 1920 14814343Swollman -6:00 Chicago C%sT 1936 Mar 1 2:00 14914343Swollman -5:00 - EST 1936 Nov 15 2:00 15014343Swollman -6:00 Chicago C%sT 1942 15114343Swollman -6:00 US C%sT 1946 15214343Swollman -6:00 Chicago C%sT 1967 15314343Swollman -6:00 US C%sT 15414343Swollman# ZONE-DESCR America Chicago United_States Central time 1552742Swollman 15614343Swollman# US Mountain time, represented by Denver 15714343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 15814343SwollmanRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 15914343SwollmanRule Denver 1920 only - Oct lastSun 2:00 0 S 16014343SwollmanRule Denver 1921 only - May 22 2:00 0 S 16114343SwollmanRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 16214343SwollmanRule Denver 1965 1966 - Oct lastSun 2:00 0 S 1632742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 16414343SwollmanZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 16514343Swollman -7:00 US E%sT 1920 16614343Swollman -7:00 Denver E%sT 1942 16714343Swollman -7:00 US E%sT 1946 16814343Swollman -7:00 Denver E%sT 1967 16914343Swollman -7:00 US E%sT 17014343Swollman# ZONE-DESCR America Denver United_States Mountain time (except Arizona) 1712742Swollman 17214343Swollman# US Pacific time, represented by Los Angeles 17314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 17414343SwollmanRule CA 1948 only - Mar 14 2:00 1:00 D 17514343SwollmanRule CA 1949 only - Jan 1 2:00 0 S 17614343SwollmanRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 17714343SwollmanRule CA 1950 1961 - Sep lastSun 2:00 0 S 17814343SwollmanRule CA 1962 1966 - Oct lastSun 2:00 0 S 17914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18014343SwollmanZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 18114343Swollman -8:00 US P%sT 1946 18214343Swollman -8:00 CA P%sT 1967 18314343Swollman -8:00 US P%sT 1848029Swollman# ZONE-DESCR America Los_Angeles United_States Pacific time 1858029Swollman 18614343Swollman# Alaska 18714343Swollman# AK%sT is the modern abbreviation for -9:00 per USNO. 18814343Swollman# 18914343Swollman# From Paul Eggert (1995-12-19): 19014343Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 19114343Swollman# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 19214343Swollman# from Russia. We omit this transition, since we can't represent changes 19314343Swollman# from Julian to Gregorian. 19414343Swollman# 19514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19614343SwollmanZone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 19714343Swollman -8:00 - PST 1942 19814343Swollman -8:00 US P%sT 1946 19914343Swollman -8:00 - PST 1969 20014343Swollman -8:00 US P%sT 1983 Oct 30 2:00 20114343Swollman -9:00 US AK%sT 20214343SwollmanZone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 20314343Swollman -9:00 - YST 1942 20414343Swollman -9:00 US Y%sT 1946 20514343Swollman -9:00 - YST 1969 20614343Swollman -9:00 US Y%sT 1983 Oct 30 2:00 20714343Swollman -9:00 US AK%sT 20814343SwollmanZone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 20914343Swollman -10:00 - CAT 1942 21014343Swollman -10:00 US CAT/CAWT 1946 21114343Swollman -10:00 - CAT 1967 Apr 21214343Swollman -10:00 - AHST 1969 21314343Swollman -10:00 US AH%sT 1983 Oct 30 2:00 21414343Swollman -9:00 US AK%sT 21514343SwollmanZone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 21614343Swollman -11:00 - NST 1942 21714343Swollman -11:00 US N%sT 1946 21814343Swollman -11:00 - NST 1967 Apr 21914343Swollman -11:00 - BST 1969 22014343Swollman -11:00 US B%sT 1983 Oct 30 2:00 22114343Swollman -9:00 US AK%sT 22214343SwollmanZone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 22314343Swollman -11:00 - NST 1942 22414343Swollman -11:00 US N%sT 1946 22514343Swollman -11:00 - NST 1967 Apr 22614343Swollman -11:00 - BST 1969 22714343Swollman -11:00 US B%sT 1983 Oct 30 2:00 22814343Swollman -10:00 US HA%sT 22914343Swollman# Shanks writes that part of southwest Alaska (e.g. Aniak) 23014343Swollman# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 23114343Swollman# and another part (e.g. Akiak) made the same switch five weeks later. 23214343Swollman# These switches don't quite make our 1970 cutoff. 2332742Swollman 23414343Swollman# ZONE-DESCR America Juneau United_States Alaska: Juneau 23514343Swollman# ZONE-DESCR America Yakutat United_States Alaska: Yakutat 23614343Swollman# ZONE-DESCR America Anchorage United_States Alaska: Anchorage 23714343Swollman# ZONE-DESCR America Nome United_States Alaska: Nome 23814343Swollman# ZONE-DESCR America Adak United_States Alaska: Aleutian Islands 2398029Swollman 24014343Swollman# Hawaii 24114343Swollman# 24214343Swollman# From Arthur David Olson: 24314343Swollman# And then there's Hawaii. 24414343Swollman# DST was observed for one day in 1933; 24514343Swollman# standard time was changed by half an hour in 1947; 24614343Swollman# it's always standard as of 1986. 24714343Swollman# 24814343Swollman# From Paul Eggert: 24914343Swollman# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 25014343Swollman# 25114343SwollmanZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 25214343Swollman -10:30 - HST 1933 Apr 30 2:00 25314343Swollman -10:30 1:00 HDT 1933 May 21 2:00 25414343Swollman -10:30 US H%sT 1947 Jun 8 2:00 25514343Swollman -10:00 - HST 2562742Swollman 25714343SwollmanZone Pacific/Midway -11:49:28 - LMT 1901 25814343Swollman -11:00 - NST 1967 Apr # N=Nome 25914343Swollman -11:00 - BST 1983 Nov 30 # B=Bering 26014343Swollman -11:00 - SST # S=Samoa 26114343Swollman 26214343Swollman# ZONE-DESCR Pacific Honolulu United_States Hawaii 26314343Swollman# ZONE-DESCR Pacific Midway United_States Midway Island 26414343Swollman 26514343Swollman# Now we turn to US areas that have diverged from the consensus since 1970. 26614343Swollman 26714343Swollman# Arizona mostly uses MST. 26814343SwollmanZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 26914343Swollman -7:00 US M%sT 1944 Jan 1 00:01 27014343Swollman -7:00 - MST 1944 Mar 17 00:01 27114343Swollman -7:00 US M%sT 1944 Oct 1 00:01 27214343Swollman -7:00 - MST 1967 27314343Swollman -7:00 US M%sT 1968 27414343Swollman -7:00 - MST 27514343Swollman 2768029Swollman# ZONE-DESCR America Phoenix United_States Arizona (except Navajo Nation) 2778029Swollman 2782742Swollman# From Arthur David Olson (February 13, 1988): 27914343Swollman# A writer from the Inter Tribal Council of Arizona, Inc., 2802742Swollman# notes in private correspondence dated 12/28/87 that "Presently, only the 2812742Swollman# Navajo Nation participates in the Daylight Saving Time policy, due to its 2822742Swollman# large size and location in three states." (The "only" means that other 2832742Swollman# tribal nations don't use DST.) 2842742Swollman 28514343SwollmanLink America/Denver America/Shiprock 2862742Swollman 28714343Swollman# Southern Idaho and eastern Oregon switched four weeks late in 1974. 28814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 28914343SwollmanZone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 29014343Swollman -8:00 US P%sT 1923 May 13 2:00 29114343Swollman -7:00 US M%sT 1974 29214343Swollman -7:00 - MST 1974 Feb 3 2:00 29314343Swollman -7:00 US M%sT 2942742Swollman 29514343Swollman# ZONE-DESCR America Boise United_States Southern Idaho and Eastern Oregon 2962742Swollman 29714343Swollman# Indiana 29814343Swollman# 29914343Swollman# From Paul Eggert (1995-12-19): 30014343Swollman# Indiana generally observes either EST all year, or CST/CDT, 30114343Swollman# but areas near Cincinnati and Louisville use those cities' timekeeping 30214343Swollman# and in 1969 and 1970 the whole state observed daylight time; 30314343Swollman# and there are other exceptions as noted below. 30414343Swollman# Shanks partitions Indiana into 345 regions, each with its own time history, 30514343Swollman# and writes ``Even newspaper reports present contradictory information.'' 30614343Swollman# Fortunately, most of the complexity occurred before our cutoff date of 1970. 30714343Swollman# 30814343Swollman# Since 1970, EST-only Indiana has been like America/Indianapolis, 30914343Swollman# with exceptions noted below for Crawford, Starke, and Switzerland counties. 31014343Swollman# The parts of Indiana not listed below have been like America/Chicago, 31114343Swollman# America/Louisville, or America/New_York. 31214343Swollman# 31314343Swollman# Other than Indianapolis, the Indiana place names are so nondescript 31414343Swollman# that they would be ambiguous if we left them at the `America' level. 31514343Swollman# So we reluctantly put them all in a subdirectory `America/Indiana'. 31614343Swollman# 31714343Swollman# Most of EST-only Indiana last observed DST in 1970. 31814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 31914343SwollmanRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 32014343SwollmanRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 32114343SwollmanRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 32214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 32314343SwollmanZone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 32414343Swollman -6:00 US C%sT 1920 32514343Swollman -6:00 Indianapolis C%sT 1942 32614343Swollman -6:00 US C%sT 1946 32714343Swollman -6:00 Indianapolis C%sT 1955 Apr 24 2:00 32814343Swollman -5:00 - EST 1957 Sep 29 2:00 32914343Swollman -6:00 - CST 1958 Apr 27 2:00 33014343Swollman -5:00 - EST 1969 33114343Swollman -5:00 US E%sT 1971 33214343Swollman -5:00 - EST 33314343SwollmanLink America/Indianapolis America/Indiana/Indianapolis 3348029Swollman 33514343Swollman# ZONE-DESCR America Indianapolis United_States Indiana: Indianapolis 33614343Swollman 3372742Swollman# 33814343Swollman# Part of Crawford County, Indiana, last observed DST in 1975, 33914343Swollman# and left its clocks alone in 1974. 34014343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 34114343SwollmanRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 34214343SwollmanRule Marengo 1951 only - Sep lastSun 2:00 0 S 34314343SwollmanRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 34414343SwollmanRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 34514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 34614343SwollmanZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 34714343Swollman -6:00 US C%sT 1951 34814343Swollman -6:00 Marengo C%sT 1961 Apr 30 2:00 34914343Swollman -5:00 - EST 1969 35014343Swollman -5:00 US E%sT 1974 Jan 6 2:00 35114343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 35214343Swollman -5:00 US E%sT 1976 35314343Swollman -5:00 - EST 3542742Swollman 35514343Swollman# sorry, tzsetup needs two-level names 35614343SwollmanLink America/Indiana/Marengo America/Marengo_IN 35714343Swollman# ZONE-DESCR America Marengo_IN United_States Indiana: Crawford County 3582742Swollman 35914343Swollman# 36014343Swollman# Starke County, Indiana 36114343Swollman# From Arthur David Olson (October 28, 1991): 36214343Swollman# An article on page A3 of the Sunday, October 27, 1991 Washington Post 36314343Swollman# notes that Starke County switched from Central time to Eastern time as of 36414343Swollman# October 27, 1991. 36514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 36614343SwollmanRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 36714343SwollmanRule Starke 1947 1954 - Sep lastSun 2:00 0 S 36814343SwollmanRule Starke 1955 1956 - Oct lastSun 2:00 0 S 36914343SwollmanRule Starke 1957 1958 - Sep lastSun 2:00 0 S 37014343SwollmanRule Starke 1959 1961 - Oct lastSun 2:00 0 S 37114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 37214343SwollmanZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 37314343Swollman -6:00 US C%sT 1947 37414343Swollman -6:00 Starke C%sT 1962 Apr 29 2:00 37514343Swollman -5:00 - EST 1963 Oct 27 2:00 37614343Swollman -6:00 US C%sT 1991 Oct 27 2:00 37714343Swollman -5:00 - EST 3782742Swollman 37914343SwollmanLink America/Indiana/Knox America/Knox_IN 38014343Swollman# ZONE-DESCR America Knox_IN United_States Indiana: Starke County 3812742Swollman 38214343Swollman# 38314343Swollman# Switzerland County, Indiana, last observed DST in 1972. 38414343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 38514343SwollmanZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 38614343Swollman -6:00 US C%sT 1954 Apr 25 2:00 38714343Swollman -5:00 - EST 1969 38814343Swollman -5:00 US E%sT 1973 38914343Swollman -5:00 - EST 3902742Swollman 39114343SwollmanLink America/Indiana/Vevay America/Vevay_IN 39214343Swollman# ZONE-DESCR America Vevay_IN United_States Indiana: Switzerland County 3932742Swollman 39414343Swollman# Part of Kentucky left its clocks alone in 1974. 39514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 39614343SwollmanRule Louisville 1921 only - May 1 2:00 1:00 D 39714343SwollmanRule Louisville 1921 only - Sep 1 2:00 0 S 39814343SwollmanRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 39914343SwollmanRule Louisville 1941 only - Sep lastSun 2:00 0 S 40014343SwollmanRule Louisville 1946 only - Jun 2 2:00 0 S 40114343SwollmanRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 40214343SwollmanRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 40314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 40414343SwollmanZone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 40514343Swollman -6:00 US C%sT 1921 40614343Swollman -6:00 Louisville C%sT 1942 40714343Swollman -6:00 US C%sT 1946 40814343Swollman -6:00 Louisville C%sT 1961 Jul 23 2:00 40914343Swollman -5:00 - EST 1968 41014343Swollman -5:00 US E%sT 1974 Jan 6 2:00 41114343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 41214343Swollman -5:00 US E%sT 4132742Swollman 41414343Swollman# ZONE-DESCR America Louisville United_States Kentucky: Louisville area 4158049Swollman 41614343Swollman# Michigan 41714343Swollman# 41814343Swollman# From Bob Devine (January 28, 1988): 41914343Swollman# Michigan didn't observe DST from 1968 to 1973. 42014343Swollman# 42114343Swollman# From Paul Eggert (1995-12-19): 42214343Swollman# Shanks writes that Michigan started using standard time on 1885 Sep 18, 42314343Swollman# but Howse (p 126) writes that Detroit kept 42414343Swollman# 42514343Swollman# local time until 1900 when the City Council decreed that clocks should 42614343Swollman# be put back twenty-eight minutes to Central Standard Time. Half the 42714343Swollman# city obeyed, half refused. After considerable debate, the decision 42814343Swollman# was rescinded and the city reverted to Sun time. A derisive offer to 42914343Swollman# erect a sundial in front of the city hall was referred to the 43014343Swollman# Committee on Sewers. Then, in 1905, Central time was adopted 43114343Swollman# by city vote. 43214343Swollman# 43314343Swollman# This story is too entertaining to be false, so go with Howse over Shanks. 43414343Swollman# 43514343Swollman# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 43614343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 43714343SwollmanRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 43814343SwollmanRule Detroit 1948 only - Sep lastSun 2:00 0 S 43914343SwollmanRule Detroit 1967 only - Jun 14 2:00 1:00 D 44014343SwollmanRule Detroit 1967 only - Oct lastSun 2:00 0 S 44114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 44214343SwollmanZone America/Detroit -5:32:11 - LMT 1905 44314343Swollman -6:00 - CST 1915 May 15 2:00 44414343Swollman -5:00 - EST 1942 44514343Swollman -5:00 US E%sT 1946 44614343Swollman -5:00 Detroit E%sT 1973 44714343Swollman -5:00 US E%sT 1975 44814343Swollman -5:00 - EST 1975 Apr 27 2:00 44914343Swollman -5:00 US E%sT 4508029Swollman 45114343Swollman# ZONE-DESCR America Detroit United_States Michigan: Mainland 45214343Swollman 45314343Swollman# 45414343Swollman# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 45514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 45614343SwollmanRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 45714343SwollmanRule Menominee 1946 only - Sep lastSun 2:00 0 S 45814343SwollmanRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 45914343SwollmanRule Menominee 1966 only - Oct lastSun 2:00 0 S 46014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 46114343SwollmanZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 46214343Swollman -6:00 US C%sT 1946 46314343Swollman -6:00 Menominee C%sT 1969 Apr 27 2:00 46414343Swollman -5:00 - EST 1973 Apr 29 2:00 46514343Swollman -6:00 US C%sT 46614343Swollman 46714343Swollman# ZONE-DESCR America Menominee United_States Michigan: Upper Peninsula 46814343Swollman 4692742Swollman# Navassa 47014343Swollman# uninhabited 47114343Swollman 47214343Swollman# Navassa 4732742Swollman# no information; probably like US/Eastern 4742742Swollman 4752742Swollman################################################################################ 4762742Swollman 4772742Swollman 4782742Swollman# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 47914343Swollman# A good source for time zone historical data outside the US is 4802742Swollman# Thomas G. Shanks, The International Atlas (3rd edition), 4812742Swollman# San Diego: ACS Publications, Inc. (1991). 4822742Swollman# Except where otherwise noted, it is the source for the data below. 4832742Swollman# 4842742Swollman# Another source occasionally used is Edward W. Whitman, World Time Differences, 4852742Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 4862742Swollman# I found in the UCLA library. 4872742Swollman# 4882742Swollman# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 4892742Swollman# Corrections are welcome! 4902742Swollman# 4919908Swollman# See the `europe' file for Greenland. 4929908Swollman# 4932742Swollman# See the `africa' file for Zone naming conventions. 4942742Swollman 4952742Swollman 4962742Swollman 4972742Swollman# Canada 4982742Swollman 4992742Swollman# Canada is reportedly lots easier than the US--leastways since 1951. 5002742Swollman# I don't know what they did before then. 5012742Swollman# 4.3BSD claims that it's perfectly regular. 5022742Swollman# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 5032742Swollman# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 5042742Swollman# "...Canada (well, Ontario and at least some of the other provinces) are 5052742Swollman# adopting the new daylight savings time rules...". We assume all of 5062742Swollman# Canada is doing so. 5072742Swollman 5082742Swollman# From Bob Devine (January 28, 1988): 5092742Swollman# All of Canada did have DST from your first rule except Saskatchewan. 5102742Swollman# Which parts did not observe DST is hard to pinpoint but most of the 5112742Swollman# province follows the rules. 5122742Swollman# NOTE: those that didn't have DST for that rule, also 5132742Swollman# probably did not have it for several years previous. 5142742Swollman 5152742Swollman# From U. S. Naval Observatory (January 19, 1989): 5162742Swollman# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 5172742Swollman# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 5182742Swollman# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 5192742Swollman# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 5202742Swollman# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 5212742Swollman# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 5222742Swollman# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 5232742Swollman# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 5242742Swollman# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 5252742Swollman# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 5262742Swollman# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 5272742Swollman# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 5282742Swollman# CANADA YUKON SAME AS PACIFIC DAWSON 5292742Swollman 5302742Swollman# From Arthur David Olson (January 21, 1989): 5312742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 5322742Swollman# Note claim that there's double DST in Newfoundland and that Yukon should 5332742Swollman# be same as Pacific. 5342742Swollman 5352742Swollman# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 5362742Swollman# The. . .below is based on information I got from our law library, the 5372742Swollman# provincial archives, and the provincial Community Services department. 5382742Swollman# A precise history would require digging through newspaper archives, and 5392742Swollman# since you didn't say what you wanted, I didn't bother. 5402742Swollman# 5412742Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 5422742Swollman# the boundary became pretty ragged as communities near it reevaluated 5432742Swollman# their affiliations in one direction or the other. In 1965 a provincial 5442742Swollman# referendum favoured legislating common time practices. 5452742Swollman# 5462742Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 5472742Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 5482742Swollman# part of Saskatchewan would use CST year round, that districts in 5492742Swollman# northwest Saskatchewan would by default follow CST but could opt to 5502742Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 5512742Swollman# zero in the summer), and that districts in southwest Saskatchewan would 5522742Swollman# by default follow MT but could opt to follow CST. 5532742Swollman# 5542742Swollman# It took a few years for the dust to settle (I know one story of a town 5552742Swollman# on one time zone having its school in another, such that a mom had to 5562742Swollman# serve her family lunch in two shifts), but presently it seems that only 5572742Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 5582742Swollman# rules any more; all other districts appear to have used CST year round 5592742Swollman# since sometime in the 1960s. 5602742Swollman# 5612742Swollman# Here's how I would summarize things. Establish a "Saskatchewan" CST 5622742Swollman# time zone, and note that it officially exists as of 15 April 1966. Any 5632742Swollman# current exceptions can put themselves in the "Mountain" zone, since 5642742Swollman# those are the rules they follow. Any past exceptions can be forgotten, 5652742Swollman# since that's what those who live here have done. 5662742Swollman 5672742Swollman# From Arthur David Olson (November 21, 1992): 5682742Swollman# East-Saskatchewan kept to avoid problems for folks using that zone by name; 5692742Swollman# plain Saskatchewan added. 5702742Swollman 5719908Swollman# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 5729908Swollman# I post here the time zone abbreviations standardized in Canada 5739908Swollman# for both English and French in the CAN/CSA-Z234.4-89 standard.... 5749908Swollman# 5759908Swollman# UTC Standard time Daylight savings time 5769908Swollman# offset French English French English 5779908Swollman# -2:30 - - HAT NDT 5789908Swollman# -3 - - HAA ADT 5799908Swollman# -3:30 HNT NST - - 5809908Swollman# -4 HNA AST HAE EDT 5819908Swollman# -5 HNE EST HAC CDT 5829908Swollman# -6 HNC CST HAR MDT 5839908Swollman# -7 HNR MST HAP PDT 5849908Swollman# -8 HNP PST HAY YDT 5859908Swollman# -9 HNY YST - - 5869908Swollman# 5879908Swollman# HN: Heure Normale ST: Standard Time 5889908Swollman# HA: Heure Avanc<e'>e DT: Daylight saving Time 5899908Swollman# 5909908Swollman# A: de l'Atlantique Atlantic 5919908Swollman# C: du Centre Central 5929908Swollman# E: de l'Est Eastern 5939908Swollman# M: Mountain 5949908Swollman# N: Newfoundland 5959908Swollman# P: du Pacifique Pacific 5969908Swollman# R: des Rocheuses 5979908Swollman# T: de Terre-Neuve 5989908Swollman# Y: du Yukon Yukon 5999908Swollman# 6009908Swollman# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 6019908Swollman# Alas, this sort of thing must be handled by localization software. 6022742Swollman 6039908Swollman 6049908Swollman 6052742Swollman# From Shanks (1991): 6062742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6072742SwollmanRule StJohns 1884 only - Jan 1 0:00 0 S 6082742SwollmanRule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 6092742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 6102742SwollmanRule StJohns 1918 only - Oct 31 2:00 0 S 6112742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 6122742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 6132742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 6142742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 6152742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 6162742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 6172742Swollman# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 6182742SwollmanRule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 6192742SwollmanRule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 6202742Swollman# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 6212742SwollmanRule StJohns 1942 only - Mar 1 0:00 1:00 D 6222742SwollmanRule StJohns 1942 only - Dec 31 0:00 0 S 6232742SwollmanRule StJohns 1943 only - May 30 0:00 1:00 D 6242742SwollmanRule StJohns 1943 only - Sep 5 0:00 0 S 6252742SwollmanRule StJohns 1944 only - Jul 10 0:00 1:00 D 6262742SwollmanRule StJohns 1944 only - Sep 2 0:00 0 S 6272742SwollmanRule StJohns 1945 only - Jan 1 0:00 1:00 D 6282742SwollmanRule StJohns 1945 only - Oct 7 2:00 0 S 6292742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 6302742Swollman# Apr 30 - Sep 24; go with Shanks. 6312742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 6322742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 6332742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 6342742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 6352742SwollmanRule StJohns 1960 max - Oct lastSun 2:00 0 S 6362742SwollmanRule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 63714343SwollmanRule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 6382742SwollmanRule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 6392742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 6402742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6412742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 6422742Swollman -3:31 StJohns N%sT 1935 Mar 30 6432742Swollman -3:30 StJohns N%sT 6442742Swollman 6458029Swollman# ZONE-DESCR America St_Johns Canada Newfoundland 6468029Swollman 6472742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6482742SwollmanRule Halifax 1902 only - Jun 15 0:00 0 S 6492742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 6502742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 6512742SwollmanRule Halifax 1918 only - Apr 14 2:00 1:00 D 6522742SwollmanRule Halifax 1918 only - Oct 31 2:00 0 S 6532742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 6542742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 6552742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 6562742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 6572742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 6582742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 6592742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 6602742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 6612742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 6622742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 6632742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 6642742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 6652742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 6662742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 6672742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 6682742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 6692742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 6702742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 6712742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 6722742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 6732742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 6742742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 6752742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 6762742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 6772742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 6782742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 6792742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 6802742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 6812742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 6822742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 6832742SwollmanRule Halifax 1942 only - Feb 9 2:00 1:00 D 6842742SwollmanRule Halifax 1945 1959 - Sep lastSun 2:00 0 S 6852742SwollmanRule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 6862742SwollmanRule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 6872742SwollmanRule Halifax 1962 max - Oct lastSun 2:00 0 S 6882742SwollmanRule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 6892742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6902742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 6912742Swollman -4:00 Halifax A%sT 6922742Swollman 6938029Swollman# ZONE-DESCR America Halifax Canada Atlantic time 6948029Swollman 6952742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6962742SwollmanRule Mont 1884 only - Jan 1 0:00 0 S 6972742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 6982742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 6992742SwollmanRule Mont 1918 only - Apr 14 2:00 1:00 D 7002742SwollmanRule Mont 1918 only - Oct 31 2:00 0 S 7012742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 7022742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 7032742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 7042742SwollmanRule Mont 1920 only - Oct 3 2:30 0 S 7052742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 7062742SwollmanRule Mont 1921 only - Oct 2 2:30 0 S 7072742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 7082742SwollmanRule Mont 1922 only - Oct 1 2:30 0 S 7092742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 7102742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 7112742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 7122742SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 7132742SwollmanRule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 7142742SwollmanRule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 7152742SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 7162742SwollmanRule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 7172742SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 7182742SwollmanRule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 7192742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 7202742SwollmanRule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 7212742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 7222742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 7232742SwollmanRule Mont 1957 max - Oct lastSun 2:00 0 S 7242742SwollmanRule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 7252742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7262742SwollmanZone America/Montreal -4:54:16 - LMT 1884 7272742Swollman -5:00 Mont E%sT 7282742Swollman 7298029Swollman# ZONE-DESCR America Montreal Canada Eastern time 7308029Swollman 7312742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7322742SwollmanRule Winn 1887 only - Jul 16 0:00 0 S 7332742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 7342742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 7352742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 7362742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 7372742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 73814343SwollmanRule Winn 1937 only - Sep 26 2:00 0 S 7392742SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 D 7402742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 7412742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 7422742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 7432742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 74414343SwollmanRule Winn 1947 1949 - Sep lastSun 2:00 0 S 74514343SwollmanRule Winn 1950 only - May 1 2:00 1:00 D 74614343SwollmanRule Winn 1950 only - Sep 30 2:00 0 S 74714343SwollmanRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 74814343SwollmanRule Winn 1951 1958 - Sep lastSun 2:00 0 S 7492742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 7502742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 7512742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 75214343SwollmanRule Winn 1963 only - Sep 22 2:00 0 S 7532742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 75414343SwollmanRule Winn 1966 max - Oct lastSun 2:00 0 S 7552742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 7562742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7572742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 7582742Swollman -6:00 Winn C%sT 7592742Swollman 7608029Swollman# ZONE-DESCR America Winnipeg Canada Manitoba 7618029Swollman 7622742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7632742SwollmanRule Regina 1905 only - Sep 1 0:00 0 S 7642742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 7652742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 7662742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 7672742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 7682742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 7692742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 7702742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 7712742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 7722742SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 D 7732742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 7742742SwollmanRule Regina 1946 only - Apr 14 2:00 1:00 D 7752742SwollmanRule Regina 1946 only - Oct 13 2:00 0 S 7762742SwollmanRule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 7772742SwollmanRule Regina 1947 1959 - Sep lastSun 2:00 0 S 7782742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7792742SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 7802742Swollman -7:00 Regina M%sT 1966 Apr 15 7812742Swollman -6:00 - CST 7822742Swollman 7838029Swollman# ZONE-DESCR America Regina Canada Saskatchewan 7848029Swollman 7852742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7862742SwollmanRule Edm 1906 only - Sep 1 0:00 0 S 7872742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 7882742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 7892742SwollmanRule Edm 1919 only - May 27 2:00 0 S 7902742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 7912742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 7922742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 7932742SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 D 7942742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 7952742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 7962742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 7972742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 7982742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 7992742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 8002742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 8012742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 8022742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 8032742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 8042742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8052742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 8062742Swollman -7:00 Edm M%sT 8072742Swollman 8088029Swollman# ZONE-DESCR America Edmonton Canada Alberta 8098029Swollman 8102742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8112742SwollmanRule Vanc 1884 only - Jan 1 0:00 0 S 8122742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 8132742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 8142742SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 D 8152742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 8162742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 8172742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 8182742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 8192742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 8202742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 8212742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8222742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 8232742Swollman -8:00 Vanc P%sT 8242742Swollman 8258029Swollman# ZONE-DESCR America Vancouver Canada British Columbia 8268029Swollman 8272742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8282742SwollmanRule Yukon 1900 only - Jan 1 0:00 0 S 8292742SwollmanRule Yukon 1918 only - Apr 14 2:00 1:00 D 8302742SwollmanRule Yukon 1918 only - Oct 27 2:00 0 S 8312742SwollmanRule Yukon 1919 only - May 25 2:00 1:00 D 8322742SwollmanRule Yukon 1919 only - Nov 1 0:00 0 S 8332742SwollmanRule Yukon 1942 only - Feb 9 2:00 1:00 D 8342742SwollmanRule Yukon 1965 only - Apr 25 0:00 1:00 D 8352742SwollmanRule Yukon 1965 only - Oct 31 2:00 0 S 8362742SwollmanRule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 8372742SwollmanRule Yukon 1980 max - Oct lastSun 2:00 0 S 8382742SwollmanRule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 8392742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8402742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 8412742Swollman -9:00 Yukon Y%sT 1966 Jul 8422742Swollman -8:00 Yukon P%sT 8432742Swollman# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 8442742Swollman 8458029Swollman# ZONE-DESCR America Whitehorse Canada Yukon Territory 8468029Swollman 8472742Swollman############################################################################### 8482742Swollman 8492742Swollman# Mexico 8502742Swollman 8512742Swollman# From Guy Harris: 8522742Swollman# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 8532742Swollman# Rules prior to 1987 are unknown. 8542742Swollman# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 8552742Swollman# observe DST." This is presumably Baja California Norte, above 28th parallel, 85614343Swollman# as listed there; [there is also] "Baja California Sur and N. Pacific 8572742Swollman# Coast (States of Sinaloa and Sonora)." 8582742Swollman 8592742Swollman# From Bob Devine (January 28, 1988): 8602742Swollman# The Federal District (where Mexico City is) has observed [DST] several 8612742Swollman# times but not recently. 8622742Swollman# 8632742Swollman# I don't where to drawn the line in the North Baja area. 28th latitude 8642742Swollman# sounds good -- but it may be higher (how far [d]o radio stations from 8652742Swollman# San Diego affect culture?). 8662742Swollman# 8672742Swollman# The dates of DST probably go back to 1981. The rules are the same as 8682742Swollman# US's. This is going to be a headache for US presidential electi[o]n years! 8692742Swollman 8702742Swollman# From Arthur David Olson (February 13, 1988) 8712742Swollman# Since the 1981 starting date is only "probable," we'll keep the 1987 8722742Swollman# starting date below. 8732742Swollman 8742742Swollman# From U. S. Naval Observatory (January 19, 1989): 8752742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 8762742Swollman# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 8772742Swollman# MEXICO BAJA CAL N OF SINALOA AND SONORA) 8782742Swollman# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 8792742Swollman# MEXICO BAJA CAL N - OCT 29 8802742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 8812742Swollman# MEXICO BAJA CAL N - 0CT 29 8822742Swollman# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 8832742Swollman# MEXICO COAHUILA, NUEVO LEON, 8842742Swollman# MEXICO TAMAULIPAS 8852742Swollman# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 8862742Swollman# MEXICO COAHUILA, NUEVO LEON, 8872742Swollman# MEXICO TAMAULIPAS APR 3 - OCT 29 8882742Swollman# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 8892742Swollman# MEXICO CAMPECHE, QUINTANA ROO AND 8902742Swollman# MEXICO YUCATAN 8912742Swollman 8922742Swollman# From Arthur David Olson (January 21, 1989): 8932742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 8942742Swollman# USNO claims there should be four Mexican zones rather than three: 8952742Swollman# a zone that's GMT-8 with DST; a zone that's always GMT-7; 8962742Swollman# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 8972742Swollman 8982742Swollman# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 8992742Swollman# Shanks also says there are four zones, but disagrees about the fourth. 9002742Swollman# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 9012742Swollman 90214343Swollman# From Paul Eggert (1996-02-07): 90314343Swollman# Today in news:4f90v4$g6g@news.internet.com.mx, Kevin Pitts 90414343Swollman# <bravo2@internet.com.mx> wrote that Mexico will use Horario de Verano (DST) 90514343Swollman# starting this year with the same rules as the US, and gave FIDE as a source. 90614343Swollman# (FIDE is a private organization that promotes efficient electrical use.) 90714343Swollman# On 1996-02-02 Mario Camou wrote that the transition times are Apr Sun>=1 90814343Swollman# 0:00 and Nov 1 0:00 but also wrote ``The DST-out date looks a bit fishy''. 90914343Swollman# Go with Pitts after 1996, and with Shanks before that. 91014343Swollman 9112742Swollman# From Shanks (1991): 9122742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 9132742SwollmanRule Mexico 1922 only - Jan 1 0:00 0 S 9142742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 9152742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 9162742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 9172742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 9182742SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 D 9192742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 9202742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 9212742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 92214343SwollmanRule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 92314343SwollmanRule Mexico 1996 max - Oct lastSun 2:00 0 S 92414343Swollman# 9252742SwollmanRule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 9262742SwollmanRule BajaN 1950 1961 - Sep lastSun 2:00 0 S 9272742SwollmanRule BajaN 1961 1966 - Oct lastSun 2:00 0 S 9282742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9292742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 9302742Swollman -7:00 - MST 1927 Jun 10 23:00 9312742Swollman -6:00 - CST 1930 Nov 15 9322742Swollman -7:00 - MST 1931 May 1 23:00 9332742Swollman -6:00 - CST 1931 Oct 9342742Swollman -7:00 - MST 1932 Mar 30 23:00 9352742Swollman -6:00 Mexico C%sT 9368029Swollman# ZONE-DESCR America Mexico_City Mexico Mexico City 9372742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 9382742Swollman -7:00 - MST 1927 Jun 10 23:00 9392742Swollman -6:00 - CST 1930 Nov 15 9402742Swollman -7:00 - MST 1931 May 1 23:00 9412742Swollman -6:00 - CST 1931 Oct 9422742Swollman -7:00 - MST 1932 Mar 30 23:00 9432742Swollman -6:00 - CST 1942 Apr 9442742Swollman -7:00 - MST 1949 Jan 14 9452742Swollman -8:00 - PST 1970 94614343Swollman -7:00 Mexico M%sT 9478029Swollman# ZONE-DESCR America Mazatlan Mexico Mazatlan 9482742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 9492742Swollman -8:00 - PST 1927 Jun 10 23:00 9502742Swollman -7:00 - MST 1930 Nov 16 9512742Swollman -8:00 - PST 1942 Apr 9522742Swollman -7:00 - MST 1949 Jan 14 9532742Swollman -8:00 BajaN P%sT 1967 Apr lastSun 2:00 95414343Swollman -8:00 US P%sT 1996 95514343Swollman -8:00 Mexico P%sT 9568029Swollman# ZONE-DESCR America Tijuana Mexico Baja California Norte 9572742SwollmanZone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 9582742Swollman -8:00 - PST 1927 Jun 10 23:00 9592742Swollman -7:00 - MST 1930 Nov 16 9602742Swollman -8:00 - PST 1942 Apr 9612742Swollman -7:00 - MST 1949 Jan 14 96214343Swollman -8:00 - PST 1996 96314343Swollman -8:00 Mexico P%sT 9648029Swollman# ZONE-DESCR America Ensenada Mexico Ensenada 9658029Swollman 9662742Swollman# 9672742Swollman# Revillagigedo Is 9682742Swollman# no information 9692742Swollman 9702742Swollman############################################################################### 9712742Swollman 9722742Swollman# Anguilla 9732742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9742742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 9752742Swollman -4:00 - AST 9762742Swollman 9778029Swollman# ZONE-DESCR America Anguilla Anguilla All points 9788029Swollman 9792742Swollman# Antigua and Barbuda 9802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9812742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 9822742Swollman -5:00 - EST 1951 9832742Swollman -4:00 - AST 9842742Swollman 9858029Swollman# ZONE-DESCR America Antigua Antigua All points 9868029Swollman 9872742Swollman# Bahamas 9882742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 9892742SwollmanRule Bahamas 1912 only - Mar 2 0:00 0 S 9902742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 9912742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 9922742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 9932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9942742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 9952742Swollman -5:00 Bahamas E%sT 9962742Swollman 9978029Swollman# ZONE-DESCR America Nassau Bahamas All points 9988029Swollman 9992742Swollman# Barbados 10002742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10012742SwollmanRule Barb 1932 only - Jan 1 0:00 0 S 10022742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 10032742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 10042742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 10052742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 10062742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 10072742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10082742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 10092742Swollman -3:58 - BMT 1932 # Bridgetown Mean Time 10102742Swollman -4:00 Barb A%sT 10112742Swollman 10128029Swollman# ZONE-DESCR America Barbados Barbados All points 10138029Swollman 10142742Swollman# Belize 10152742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 10162742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10172742SwollmanRule Belize 1912 only - Apr 1 0:00 0 S 10182742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 10192742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 10202742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 10212742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 10222742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 10232742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 10242742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10252742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 10262742Swollman -6:00 Belize C%sT 10272742Swollman 10288029Swollman# ZONE-DESCR America Belize Belize All points 10298029Swollman 10302742Swollman# Bermuda 10312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10322742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 10332742Swollman -4:00 - AST 1974 Apr 28 2:00 10342742Swollman -4:00 Bahamas A%sT 10352742Swollman 10368029Swollman# ZONE-DESCR Atlantic Bermuda Bermuda All points 10378029Swollman 10382742Swollman# Cayman Is 10392742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10402742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 10412742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 10422742Swollman -5:00 - EST 10432742Swollman 10448029Swollman# ZONE-DESCR America Cayman Cayman_Islands All points 10458029Swollman 10462742Swollman# Clipperton 104714343Swollman# uninhabited 10482742Swollman 10492742Swollman# Costa Rica 10502742Swollman# Shanks gives some very odd dates for 1991, and stops there. 10512742Swollman# For now, we won't guess further. 10522742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10532742SwollmanRule CR 1921 only - Jan 15 0:00 0 S 10542742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 10552742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 10562742SwollmanRule CR 1991 only - Jan 19 0:00 1:00 D 10572742SwollmanRule CR 1991 only - Jul 1 0:00 0 S 10582742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 10592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10602742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 10612742Swollman -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 10622742Swollman -6:00 CR C%sT 10638029Swollman# ZONE-DESCR America Costa_Rica Costa_Rica All points 10648029Swollman 10652742Swollman# Coco 10662742Swollman# no information; probably like America/Costa_Rica 10672742Swollman 10682742Swollman# Cuba 10692742Swollman 10702742Swollman# From Bob Devine (January 28, 1988): 10712742Swollman# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 10722742Swollman# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 10732742Swollman# (I think). 10742742Swollman 10752742Swollman# From U. S. Naval Observatory (January 19, 1989): 10762742Swollman# CUBA 5 H BEHIND UTC 10772742Swollman# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 10782742Swollman 10792742Swollman# From Shanks (1991): 10802742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10812742SwollmanRule Cuba 1925 only - Jul 19 12:00 0 S 10822742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 10832742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 10842742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 10852742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 10862742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 10872742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 10882742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 10892742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 10902742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 10912742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 10922742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 10932742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 10942742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 10952742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 10962742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 10972742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 10982742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 10992742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 11002742SwollmanRule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 11012742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 11022742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 11032742SwollmanRule Cuba 1981 max - Oct Sun>=8 0:00 0 S 11042742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 11052742SwollmanRule Cuba 1990 only - Apr 1 0:00 1:00 D 11062742SwollmanRule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 11072742Swollman 11082742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11092742SwollmanZone America/Havana -5:29:28 - LMT 1890 11102742Swollman -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 11112742Swollman -5:00 Cuba C%sT 11122742Swollman 11138029Swollman# ZONE-DESCR America Havana Cuba All points 11148029Swollman 11152742Swollman# Dominica 11162742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11172742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 11182742Swollman -4:00 - AST 11192742Swollman 11208029Swollman# ZONE-DESCR America Dominica Dominica All points 11218029Swollman 11222742Swollman# Dominican Republic 11232742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11242742SwollmanRule DR 1933 only - Apr 1 12:00 0 S 11252742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 11262742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 11272742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 11282742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 11292742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 11302742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 11312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11322742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 11332742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 11342742Swollman -5:00 DR E%sT 1974 Oct 27 11352742Swollman -4:00 - AST 11362742Swollman 11378029Swollman# ZONE-DESCR America Santo_Domingo Dominican_Republic All points 11388029Swollman 11392742Swollman# El Salvador 11402742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11412742SwollmanRule Salv 1921 only - Jan 1 0:00 0 S 11422742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 11432742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 11442742Swollman# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 11452742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11462742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 11472742Swollman -6:00 Salv C%sT 11482742Swollman 11498029Swollman# ZONE-DESCR America El_Salvador El_Salvador All points 11508029Swollman 11512742Swollman# Grenada 11522742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11532742SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul 11542742Swollman -4:00 - AST 11552742Swollman 11568029Swollman# ZONE-DESCR America Grenada Grenada All points 11578029Swollman 11582742Swollman# Guadeloupe 11592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11602742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 11612742Swollman -4:00 - AST 11622742Swollman 11638029Swollman# ZONE-DESCR America Guadeloupe Guadeloupe All points 11648029Swollman 11652742Swollman# Guatemala 11662742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11672742SwollmanRule Guat 1918 only - Oct 5 0:00 0 S 11682742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 11692742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 11702742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 11712742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 11722742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11732742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 11742742Swollman -6:00 Guat C%sT 11752742Swollman 11768029Swollman# ZONE-DESCR America Guatemala Guatemala All points 11778029Swollman 11782742Swollman# Haiti 11792742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11802742SwollmanRule Haiti 1917 only - Jan 24 12:00 0 S 11812742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 11822742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 11832742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 11842742SwollmanRule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 11852742SwollmanRule Haiti 1988 max - Oct lastSun 2:00 0 S 11862742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11872742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 11882742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 11892742Swollman -5:00 Haiti E%sT 11902742Swollman 11918029Swollman# ZONE-DESCR America Port-au-Prince Haiti All points 11928029Swollman 11932742Swollman# Honduras 11942742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 11952742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11962742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 11972742Swollman -6:00 Salv C%sT 11982742Swollman 11998029Swollman# ZONE-DESCR America Tegucigalpa Honduras All points 12008029Swollman 12012742Swollman# Jamaica 12022742Swollman 12032742Swollman# From Bob Devine (January 28, 1988): 12042742Swollman# Follows US rules. 12052742Swollman 12062742Swollman# From U. S. Naval Observatory (January 19, 1989): 12072742Swollman# JAMAICA 5 H BEHIND UTC 12082742Swollman 12092742Swollman# From Shanks (1991): 12102742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12112742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 12122742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 12132742Swollman -5:00 - EST 1974 Jan 6 2:00 12142742Swollman -5:00 US E%sT 12152742Swollman 12168029Swollman# ZONE-DESCR America Jamaica Jamaica All points 12178029Swollman 12182742Swollman# Martinique 12192742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12202742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 12212742Swollman -4:04 - FFMT 1911 May # Fort-de-France MT 12222742Swollman -4:00 - AST 1980 Apr 6 12232742Swollman -4:00 1:00 ADT 1980 Sep 28 12242742Swollman -4:00 - AST 12252742Swollman 12268029Swollman# ZONE-DESCR America Martinique Martinique All points 12278029Swollman 12282742Swollman# Montserrat 12292742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12302742SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 12312742Swollman -4:00 - AST 12322742Swollman 12338029Swollman# ZONE-DESCR America Montserrat Montserrat All points 12348029Swollman 12352742Swollman# Nicaragua 12362742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12372742SwollmanRule Nic 1975 only - Feb 16 0:00 0 S 12382742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 12392742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 12402742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12412742SwollmanZone America/Managua -5:45:08 - LMT 1890 12422742Swollman -5:45 - MMT 1934 Jun 23 # Managua Mean Time 12432742Swollman -6:00 - CST 1973 May 12442742Swollman -5:00 - EST 1975 Feb 16 12452742Swollman -6:00 Nic C%sT 12462742Swollman 12478029Swollman# ZONE-DESCR America Managua Nicaragua All points 12488029Swollman 12492742Swollman# Panama 12502742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12512742SwollmanZone America/Panama -5:18:08 - LMT 1890 12522742Swollman -5:20 - PMT 1908 Apr 22 # Panama Mean Time 12532742Swollman -5:00 - EST 12542742Swollman 12558029Swollman# ZONE-DESCR America Panama Panama All points 12568029Swollman 12572742Swollman# Puerto Rico 12582742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 12592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 126014343SwollmanZone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 12612742Swollman -4:00 - AST 1942 May 3 126214343Swollman -4:00 1:00 AWT 1945 Sep 30 2:00 12632742Swollman -4:00 - AST 12642742Swollman 12658029Swollman# ZONE-DESCR America Puerto_Rico United_States Puerto Rico 12668029Swollman 12672742Swollman# St Kitts-Nevis 12682742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12692742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 12702742Swollman -4:00 - AST 12712742Swollman 12728029Swollman# ZONE-DESCR America St_Kitts St_Kitts_and_Nevis All points 12738029Swollman 12742742Swollman# St Lucia 12752742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12762742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 12772742Swollman -4:04 - CMT 1912 # Castries Mean Time 12782742Swollman -4:00 - AST 12792742Swollman 12808029Swollman# ZONE-DESCR America St_Lucia St_Lucia All points 12818029Swollman 12822742Swollman# St Pierre and Miquelon 12832742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 12842742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12852742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 12862742Swollman -4:00 - AST 1980 May 12872742Swollman -3:00 Mont SP%sT 12882742Swollman 12898029Swollman# ZONE-DESCR America Miquelon France St. Pierre and Miquelon 12908029Swollman 12912742Swollman# St Vincent and the Grenadines 12922742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12932742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 12942742Swollman -4:05 - KMT 1912 # Kingstown Mean Time 12952742Swollman -4:00 - AST 12962742Swollman 12978029Swollman# ZONE-DESCR America St_Vincent St_Vincent All points 12988029Swollman 12992742Swollman# Turks and Caicos 13002742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13012742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 13022742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 13032742Swollman -5:00 - EST 1979 Apr 29 2:00 13042742Swollman -5:00 US E%sT 13058029Swollman# ZONE-DESCR America Grand_Turk Turks_and_Caicos All points 13068029Swollman 130714343Swollman# British Virgin Is 13082742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 130914343SwollmanZone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 13102742Swollman -4:00 - AST 13118029Swollman 131214343Swollman# ZONE-DESCR America Tortola United_Kingdom British Virgin Islands 131314343Swollman 131414343Swollman# Virgin Is 131514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 131614343SwollmanZone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 131714343Swollman -4:00 - AST 131814343Swollman 131914343Swollman# ZONE-DESCR America St_Thomas United_States Virgin Islands 1320