northamerica revision 43543
143543Swollman# @(#)northamerica 7.42 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 819878Swollman# From Paul Eggert <eggert@twinsun.com> (1994-08-17): 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 2417200Swollman# From Paul Eggert (1996-06-12): 2517200Swollman# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 2617200Swollman# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). 2717200Swollman# Not everyone is happy with the results: 2817200Swollman# 2917200Swollman# I don't really care how time is reckoned so long as there is some 3017200Swollman# agreement about it, but I object to being told that I am saving 3117200Swollman# daylight when my reason tells me that I am doing nothing of the kind. 3217200Swollman# I even object to the implication that I am wasting something 3317200Swollman# valuable if I stay in bed after the sun has risen. As an admirer 3417200Swollman# of moonlight I resent the bossy insistence of those who want to 3517200Swollman# reduce my time for enjoying it. At the back of the Daylight Saving 3617200Swollman# scheme I detect the bony, blue-fingered hand of Puritanism, eager 3717200Swollman# to push people into bed earlier, and get them up earlier, to make 3817200Swollman# them healthy, wealthy and wise in spite of themselves. 3917200Swollman# 4017200Swollman# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 4117200Swollman 422742Swollman# From Arthur David Olson: 432742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 4419878Swollman# See, for example, the front page of the Saturday, 1974-10-26 4519878Swollman# and Sunday, 1974-10-27 editions of the Washington Post. 462742Swollman 472742Swollman# From Arthur David Olson: 482742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 492742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 502742Swollman 512742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5214343SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 532742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 542742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 552742SwollmanRule US 1945 only - Sep 30 2:00 0 S 562742SwollmanRule US 1967 max - Oct lastSun 2:00 0 S 572742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 582742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 592742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 602742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 612742SwollmanRule US 1987 max - Apr Sun>=1 2:00 1:00 D 6243543Swollman# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 6343543Swollman# H.R.177 6443543Swollman# </a> (introduced 1999-01-06) would change April to March in the above rule. 652742Swollman 6619878Swollman# From Bob Devine (1988-01-28): 672742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 682742Swollman# old new 692742Swollman# Pacific Standard Time(PST) -same- 702742Swollman# Yukon Standard Time(YST) -same- 712742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 722742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 732742Swollman# 742742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 752742Swollman# The YST zone now covers nearly all of the state, AHST just part 762742Swollman# of the Aleutian islands. No DST. 772742Swollman 7814343Swollman# From Paul Eggert (1995-12-19): 7914343Swollman# The tables below use `NST', not `NT', for Nome Standard Time. 8014343Swollman# I invented `CAWT' for Central Alaska War Time. 8114343Swollman 8219878Swollman# From U. S. Naval Observatory (1989-01-19): 832742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 842742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 852742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 862742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 872742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 882742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 892742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 902742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 912742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 922742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 932742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 942742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 952742Swollman# USA HAWAII 10 H BEHIND UTC 962742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 972742Swollman 9819878Swollman# From Arthur David Olson (1989-01-21): 992742Swollman# The above dates are for 1988. 1002742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 1012742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 1022742Swollman# Aleutians. 1032742Swollman 10419878Swollman# From Arthur David Olson (1988-02-13): 1052742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 1062742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 10719878Swollman# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 1082742Swollman# took effect), as explained in sections 263 and 261: 1092742Swollman# (none) 1102742Swollman# United States standard eastern time 1112742Swollman# United States standard mountain time 1122742Swollman# United States standard central time 1132742Swollman# United States standard Pacific time 1142742Swollman# (none) 1152742Swollman# United States standard Alaska time 1162742Swollman# (none) 11719878Swollman# Next, names from 1967-04-01 until 1983-11-30 (the date for 1182742Swollman# public law 98-181): 1192742Swollman# Atlantic standard time 1202742Swollman# eastern standard time 1212742Swollman# central standard time 1222742Swollman# mountain standard time 1232742Swollman# Pacific standard time 1242742Swollman# Yukon standard time 1252742Swollman# Alaska-Hawaii standard time 1262742Swollman# Bering standard time 12719878Swollman# And after 1983-11-30: 1282742Swollman# Atlantic standard time 1292742Swollman# eastern standard time 1302742Swollman# central standard time 1312742Swollman# mountain standard time 1322742Swollman# Pacific standard time 1332742Swollman# Alaska standard time 1342742Swollman# Hawaii-Aleutian standard time 1352742Swollman# Samoa standard time 1362742Swollman# The law doesn't give abbreviations. 13714343Swollman# 13814343Swollman# From Paul Eggert (1995-12-19): 13914343Swollman# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 14014343Swollman# Go with Shanks. 1412742Swollman 14214343Swollman# US Eastern time, represented by New York 14314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 14414343SwollmanRule NYC 1920 only - Mar lastSun 2:00 1:00 D 14514343SwollmanRule NYC 1920 only - Oct lastSun 2:00 0 S 14614343SwollmanRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 14714343SwollmanRule NYC 1921 1954 - Sep lastSun 2:00 0 S 14814343SwollmanRule NYC 1955 1966 - Oct lastSun 2:00 0 S 14914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 15014343SwollmanZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 15114343Swollman -5:00 US E%sT 1920 15214343Swollman -5:00 NYC E%sT 1942 15314343Swollman -5:00 US E%sT 1946 15414343Swollman -5:00 NYC E%sT 1967 15514343Swollman -5:00 US E%sT 1562742Swollman 15714343Swollman# US Central time, represented by Chicago 15814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 15914343SwollmanRule Chicago 1920 only - Jun 13 2:00 1:00 D 16014343SwollmanRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 16114343SwollmanRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 16214343SwollmanRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 16314343SwollmanRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 16414343SwollmanRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 16514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 16614343SwollmanZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 16714343Swollman -6:00 US C%sT 1920 16814343Swollman -6:00 Chicago C%sT 1936 Mar 1 2:00 16914343Swollman -5:00 - EST 1936 Nov 15 2:00 17014343Swollman -6:00 Chicago C%sT 1942 17114343Swollman -6:00 US C%sT 1946 17214343Swollman -6:00 Chicago C%sT 1967 17314343Swollman -6:00 US C%sT 1742742Swollman 17514343Swollman# US Mountain time, represented by Denver 17614343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 17714343SwollmanRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 17814343SwollmanRule Denver 1920 only - Oct lastSun 2:00 0 S 17914343SwollmanRule Denver 1921 only - May 22 2:00 0 S 18014343SwollmanRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 18114343SwollmanRule Denver 1965 1966 - Oct lastSun 2:00 0 S 1822742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18314343SwollmanZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 18415309Swollman -7:00 US M%sT 1920 18515309Swollman -7:00 Denver M%sT 1942 18615309Swollman -7:00 US M%sT 1946 18715309Swollman -7:00 Denver M%sT 1967 18815309Swollman -7:00 US M%sT 1892742Swollman 19014343Swollman# US Pacific time, represented by Los Angeles 19114343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 19214343SwollmanRule CA 1948 only - Mar 14 2:00 1:00 D 19314343SwollmanRule CA 1949 only - Jan 1 2:00 0 S 19414343SwollmanRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 19514343SwollmanRule CA 1950 1961 - Sep lastSun 2:00 0 S 19614343SwollmanRule CA 1962 1966 - Oct lastSun 2:00 0 S 19714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19814343SwollmanZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 19914343Swollman -8:00 US P%sT 1946 20014343Swollman -8:00 CA P%sT 1967 20114343Swollman -8:00 US P%sT 2028029Swollman 20314343Swollman# Alaska 20414343Swollman# AK%sT is the modern abbreviation for -9:00 per USNO. 20514343Swollman# 20614343Swollman# From Paul Eggert (1995-12-19): 20714343Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 20819878Swollman# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 20919878Swollman# This was on 1867-10-18. We omit this transition, since we can't represent 21019878Swollman# changes from Julian to Gregorian. 21114343Swollman# 21214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 21314343SwollmanZone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 21414343Swollman -8:00 - PST 1942 21514343Swollman -8:00 US P%sT 1946 21614343Swollman -8:00 - PST 1969 21714343Swollman -8:00 US P%sT 1983 Oct 30 2:00 21814343Swollman -9:00 US AK%sT 21914343SwollmanZone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 22014343Swollman -9:00 - YST 1942 22114343Swollman -9:00 US Y%sT 1946 22214343Swollman -9:00 - YST 1969 22314343Swollman -9:00 US Y%sT 1983 Oct 30 2:00 22414343Swollman -9:00 US AK%sT 22514343SwollmanZone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 22614343Swollman -10:00 - CAT 1942 22714343Swollman -10:00 US CAT/CAWT 1946 22814343Swollman -10:00 - CAT 1967 Apr 22914343Swollman -10:00 - AHST 1969 23014343Swollman -10:00 US AH%sT 1983 Oct 30 2:00 23114343Swollman -9:00 US AK%sT 23214343SwollmanZone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 23314343Swollman -11:00 - NST 1942 23414343Swollman -11:00 US N%sT 1946 23514343Swollman -11:00 - NST 1967 Apr 23614343Swollman -11:00 - BST 1969 23714343Swollman -11:00 US B%sT 1983 Oct 30 2:00 23814343Swollman -9:00 US AK%sT 23914343SwollmanZone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 24014343Swollman -11:00 - NST 1942 24114343Swollman -11:00 US N%sT 1946 24214343Swollman -11:00 - NST 1967 Apr 24314343Swollman -11:00 - BST 1969 24414343Swollman -11:00 US B%sT 1983 Oct 30 2:00 24514343Swollman -10:00 US HA%sT 24614343Swollman# Shanks writes that part of southwest Alaska (e.g. Aniak) 24714343Swollman# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 24814343Swollman# and another part (e.g. Akiak) made the same switch five weeks later. 24914343Swollman# These switches don't quite make our 1970 cutoff. 2502742Swollman 25114343Swollman# Hawaii 25214343Swollman# 25314343Swollman# From Arthur David Olson: 25414343Swollman# And then there's Hawaii. 25514343Swollman# DST was observed for one day in 1933; 25614343Swollman# standard time was changed by half an hour in 1947; 25714343Swollman# it's always standard as of 1986. 25814343Swollman# 25914343Swollman# From Paul Eggert: 26014343Swollman# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 26114343Swollman# 26214343SwollmanZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 26314343Swollman -10:30 - HST 1933 Apr 30 2:00 26414343Swollman -10:30 1:00 HDT 1933 May 21 2:00 26514343Swollman -10:30 US H%sT 1947 Jun 8 2:00 26614343Swollman -10:00 - HST 2672742Swollman 26814343Swollman# Now we turn to US areas that have diverged from the consensus since 1970. 26914343Swollman 27014343Swollman# Arizona mostly uses MST. 27114343SwollmanZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 27214343Swollman -7:00 US M%sT 1944 Jan 1 00:01 27314343Swollman -7:00 - MST 1944 Mar 17 00:01 27414343Swollman -7:00 US M%sT 1944 Oct 1 00:01 27514343Swollman -7:00 - MST 1967 27614343Swollman -7:00 US M%sT 1968 27714343Swollman -7:00 - MST 27819878Swollman# From Arthur David Olson (1988-02-13): 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# Indiana 29614343Swollman# 29714343Swollman# From Paul Eggert (1995-12-19): 29814343Swollman# Indiana generally observes either EST all year, or CST/CDT, 29914343Swollman# but areas near Cincinnati and Louisville use those cities' timekeeping 30014343Swollman# and in 1969 and 1970 the whole state observed daylight time; 30114343Swollman# and there are other exceptions as noted below. 30214343Swollman# Shanks partitions Indiana into 345 regions, each with its own time history, 30314343Swollman# and writes ``Even newspaper reports present contradictory information.'' 30414343Swollman# Fortunately, most of the complexity occurred before our cutoff date of 1970. 30514343Swollman# 30614343Swollman# Since 1970, EST-only Indiana has been like America/Indianapolis, 30714343Swollman# with exceptions noted below for Crawford, Starke, and Switzerland counties. 30814343Swollman# The parts of Indiana not listed below have been like America/Chicago, 30914343Swollman# America/Louisville, or America/New_York. 31014343Swollman# 31114343Swollman# Other than Indianapolis, the Indiana place names are so nondescript 31214343Swollman# that they would be ambiguous if we left them at the `America' level. 31314343Swollman# So we reluctantly put them all in a subdirectory `America/Indiana'. 31414343Swollman# 31514343Swollman# Most of EST-only Indiana last observed DST in 1970. 31614343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 31714343SwollmanRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 31814343SwollmanRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 31914343SwollmanRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 32014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 32114343SwollmanZone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 32214343Swollman -6:00 US C%sT 1920 32314343Swollman -6:00 Indianapolis C%sT 1942 32414343Swollman -6:00 US C%sT 1946 32514343Swollman -6:00 Indianapolis C%sT 1955 Apr 24 2:00 32614343Swollman -5:00 - EST 1957 Sep 29 2:00 32714343Swollman -6:00 - CST 1958 Apr 27 2:00 32814343Swollman -5:00 - EST 1969 32914343Swollman -5:00 US E%sT 1971 33014343Swollman -5:00 - EST 33114343SwollmanLink America/Indianapolis America/Indiana/Indianapolis 3322742Swollman# 33314343Swollman# Part of Crawford County, Indiana, last observed DST in 1975, 33414343Swollman# and left its clocks alone in 1974. 33514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 33614343SwollmanRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 33714343SwollmanRule Marengo 1951 only - Sep lastSun 2:00 0 S 33814343SwollmanRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 33914343SwollmanRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 34014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 34114343SwollmanZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 34214343Swollman -6:00 US C%sT 1951 34314343Swollman -6:00 Marengo C%sT 1961 Apr 30 2:00 34414343Swollman -5:00 - EST 1969 34514343Swollman -5:00 US E%sT 1974 Jan 6 2:00 34614343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 34714343Swollman -5:00 US E%sT 1976 34814343Swollman -5:00 - EST 34914343Swollman# 35014343Swollman# Starke County, Indiana 35119878Swollman# From Arthur David Olson (1991-10-28): 35219878Swollman# An article on page A3 of the Sunday, 1991-10-27 Washington Post 35314343Swollman# notes that Starke County switched from Central time to Eastern time as of 35419878Swollman# 1991-10-27. 35514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 35614343SwollmanRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 35714343SwollmanRule Starke 1947 1954 - Sep lastSun 2:00 0 S 35814343SwollmanRule Starke 1955 1956 - Oct lastSun 2:00 0 S 35914343SwollmanRule Starke 1957 1958 - Sep lastSun 2:00 0 S 36014343SwollmanRule Starke 1959 1961 - Oct lastSun 2:00 0 S 36114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 36214343SwollmanZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 36314343Swollman -6:00 US C%sT 1947 36414343Swollman -6:00 Starke C%sT 1962 Apr 29 2:00 36514343Swollman -5:00 - EST 1963 Oct 27 2:00 36614343Swollman -6:00 US C%sT 1991 Oct 27 2:00 36714343Swollman -5:00 - EST 36814343Swollman# 36914343Swollman# Switzerland County, Indiana, last observed DST in 1972. 37014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 37114343SwollmanZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 37214343Swollman -6:00 US C%sT 1954 Apr 25 2:00 37314343Swollman -5:00 - EST 1969 37414343Swollman -5:00 US E%sT 1973 37514343Swollman -5:00 - EST 3762742Swollman 37714343Swollman# Part of Kentucky left its clocks alone in 1974. 37814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 37914343SwollmanRule Louisville 1921 only - May 1 2:00 1:00 D 38014343SwollmanRule Louisville 1921 only - Sep 1 2:00 0 S 38114343SwollmanRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 38214343SwollmanRule Louisville 1941 only - Sep lastSun 2:00 0 S 38314343SwollmanRule Louisville 1946 only - Jun 2 2:00 0 S 38414343SwollmanRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 38514343SwollmanRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 38614343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 38714343SwollmanZone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 38814343Swollman -6:00 US C%sT 1921 38914343Swollman -6:00 Louisville C%sT 1942 39014343Swollman -6:00 US C%sT 1946 39114343Swollman -6:00 Louisville C%sT 1961 Jul 23 2:00 39214343Swollman -5:00 - EST 1968 39314343Swollman -5:00 US E%sT 1974 Jan 6 2:00 39414343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 39514343Swollman -5:00 US E%sT 3962742Swollman 39714343Swollman# Michigan 39814343Swollman# 39919878Swollman# From Bob Devine (1988-01-28): 40014343Swollman# Michigan didn't observe DST from 1968 to 1973. 40114343Swollman# 40214343Swollman# From Paul Eggert (1995-12-19): 40314343Swollman# Shanks writes that Michigan started using standard time on 1885 Sep 18, 40414343Swollman# but Howse (p 126) writes that Detroit kept 40514343Swollman# 40614343Swollman# local time until 1900 when the City Council decreed that clocks should 40714343Swollman# be put back twenty-eight minutes to Central Standard Time. Half the 40814343Swollman# city obeyed, half refused. After considerable debate, the decision 40914343Swollman# was rescinded and the city reverted to Sun time. A derisive offer to 41014343Swollman# erect a sundial in front of the city hall was referred to the 41114343Swollman# Committee on Sewers. Then, in 1905, Central time was adopted 41214343Swollman# by city vote. 41314343Swollman# 41414343Swollman# This story is too entertaining to be false, so go with Howse over Shanks. 41514343Swollman# 41614343Swollman# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 41714343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 41814343SwollmanRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 41914343SwollmanRule Detroit 1948 only - Sep lastSun 2:00 0 S 42014343SwollmanRule Detroit 1967 only - Jun 14 2:00 1:00 D 42114343SwollmanRule Detroit 1967 only - Oct lastSun 2:00 0 S 42214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 42314343SwollmanZone America/Detroit -5:32:11 - LMT 1905 42414343Swollman -6:00 - CST 1915 May 15 2:00 42514343Swollman -5:00 - EST 1942 42614343Swollman -5:00 US E%sT 1946 42714343Swollman -5:00 Detroit E%sT 1973 42814343Swollman -5:00 US E%sT 1975 42914343Swollman -5:00 - EST 1975 Apr 27 2:00 43014343Swollman -5:00 US E%sT 43114343Swollman# 43214343Swollman# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 43314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 43414343SwollmanRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 43514343SwollmanRule Menominee 1946 only - Sep lastSun 2:00 0 S 43614343SwollmanRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 43714343SwollmanRule Menominee 1966 only - Oct lastSun 2:00 0 S 43814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 43914343SwollmanZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 44014343Swollman -6:00 US C%sT 1946 44114343Swollman -6:00 Menominee C%sT 1969 Apr 27 2:00 44214343Swollman -5:00 - EST 1973 Apr 29 2:00 44314343Swollman -6:00 US C%sT 44414343Swollman 4452742Swollman# Navassa 44643543Swollman# claimed by US under the provisions of the 1856 Guano Islands Act 44743543Swollman# also claimed by Haiti 44843543Swollman# occupied 1857/1900 by the Navassa Phosphate Co 44943543Swollman# US lighthouse 1917/1997-01 45043543Swollman# currently uninhabited 45143543Swollman# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 45243543Swollman# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 45343543Swollman# Jimmy Skaggs, _The Great Guano Rush_ (1994). 45414343Swollman 45519878Swollman# Old names, for S5 users 45619878Swollman 45719878Swollman# Link LINK-FROM LINK-TO 45819878SwollmanLink America/New_York EST5EDT 45919878SwollmanLink America/Chicago CST6CDT 46019878SwollmanLink America/Denver MST7MDT 46119878SwollmanLink America/Los_Angeles PST8PDT 46219878SwollmanLink America/Indianapolis EST 46319878SwollmanLink America/Phoenix MST 46419878SwollmanLink Pacific/Honolulu HST 46519878Swollman 4662742Swollman################################################################################ 4672742Swollman 4682742Swollman 46920094Swollman# From Paul Eggert <eggert@twinsun.com> (1996-11-22): 47014343Swollman# A good source for time zone historical data outside the US is 47143014Swollman# Thomas G. Shanks, The International Atlas (4th edition), 47243014Swollman# San Diego: ACS Publications, Inc. (1995). 4732742Swollman# 47420094Swollman# Gwillim Law <LAW@encmail.encompass.com> writes that a good source 47520094Swollman# for recent time zone data is the International Air Transport 47620094Swollman# Association's Standard Schedules Information Manual (IATA SSIM), 47720094Swollman# published semiannually. Law sent in several helpful summaries 47820094Swollman# of the IATA's data after 1990. 47920094Swollman# 48020094Swollman# Except where otherwise noted, Shanks is the source for entries through 1990, 48120094Swollman# and IATA SSIM is the source for entries after 1990. 48220094Swollman# 4832742Swollman# Another source occasionally used is Edward W. Whitman, World Time Differences, 4842742Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 4852742Swollman# I found in the UCLA library. 4862742Swollman# 4879908Swollman# See the `europe' file for Greenland. 4882742Swollman 4892742Swollman# Canada 4902742Swollman 4919908Swollman# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 4929908Swollman# I post here the time zone abbreviations standardized in Canada 4939908Swollman# for both English and French in the CAN/CSA-Z234.4-89 standard.... 4949908Swollman# 4959908Swollman# UTC Standard time Daylight savings time 4969908Swollman# offset French English French English 4979908Swollman# -2:30 - - HAT NDT 4989908Swollman# -3 - - HAA ADT 4999908Swollman# -3:30 HNT NST - - 5009908Swollman# -4 HNA AST HAE EDT 5019908Swollman# -5 HNE EST HAC CDT 5029908Swollman# -6 HNC CST HAR MDT 5039908Swollman# -7 HNR MST HAP PDT 5049908Swollman# -8 HNP PST HAY YDT 5059908Swollman# -9 HNY YST - - 5069908Swollman# 5079908Swollman# HN: Heure Normale ST: Standard Time 5089908Swollman# HA: Heure Avanc<e'>e DT: Daylight saving Time 5099908Swollman# 5109908Swollman# A: de l'Atlantique Atlantic 5119908Swollman# C: du Centre Central 5129908Swollman# E: de l'Est Eastern 5139908Swollman# M: Mountain 5149908Swollman# N: Newfoundland 5159908Swollman# P: du Pacifique Pacific 5169908Swollman# R: des Rocheuses 5179908Swollman# T: de Terre-Neuve 5189908Swollman# Y: du Yukon Yukon 5199908Swollman# 5209908Swollman# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 5219908Swollman# Alas, this sort of thing must be handled by localization software. 5222742Swollman 52317200Swollman# The data for Canada are all from Shanks (1991). 5249908Swollman 5259908Swollman 5262742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 52717200SwollmanRule Canada 1918 only - Apr 14 2:00 1:00 D 52817200SwollmanRule Canada 1918 only - Oct 31 2:00 0 S 52917200SwollmanRule Canada 1942 only - Feb 9 2:00 1:00 D 53017200SwollmanRule Canada 1945 only - Sep 30 2:00 0 S 53117200SwollmanRule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 53217200SwollmanRule Canada 1974 max - Oct lastSun 2:00 0 S 53317200SwollmanRule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 53417200Swollman 53517200Swollman 53620094Swollman# Newfoundland (except Labrador) 53717200Swollman 53817200Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5392742SwollmanRule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 5402742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 5412742SwollmanRule StJohns 1918 only - Oct 31 2:00 0 S 5422742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 5432742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 5442742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 5452742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 5462742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 5472742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 5482742Swollman# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 5492742SwollmanRule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 5502742SwollmanRule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 5512742Swollman# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 5522742SwollmanRule StJohns 1942 only - Mar 1 0:00 1:00 D 5532742SwollmanRule StJohns 1942 only - Dec 31 0:00 0 S 5542742SwollmanRule StJohns 1943 only - May 30 0:00 1:00 D 5552742SwollmanRule StJohns 1943 only - Sep 5 0:00 0 S 5562742SwollmanRule StJohns 1944 only - Jul 10 0:00 1:00 D 5572742SwollmanRule StJohns 1944 only - Sep 2 0:00 0 S 5582742SwollmanRule StJohns 1945 only - Jan 1 0:00 1:00 D 5592742SwollmanRule StJohns 1945 only - Oct 7 2:00 0 S 5602742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 5612742Swollman# Apr 30 - Sep 24; go with Shanks. 5622742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 5632742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 5642742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 5652742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 5662742SwollmanRule StJohns 1960 max - Oct lastSun 2:00 0 S 5672742SwollmanRule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 56814343SwollmanRule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 5692742SwollmanRule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 5702742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 5712742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5722742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 57320094Swollman -3:30:52 StJohns N%sT 1935 Mar 30 5742742Swollman -3:30 StJohns N%sT 5752742Swollman 5768029Swollman 57720094Swollman# east Labrador 57817200Swollman 57920094Swollman# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 58020094Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 58120094SwollmanZone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 58220094Swollman -3:30:52 StJohns NST 1919 58320094Swollman -3:30:52 - NST 1935 Mar 30 58420094Swollman -3:30 - NST 1936 58520094Swollman -3:30 StJohns N%sT 1966 Mar 15 2:00 58620094Swollman -4:00 StJohns A%sT 58720094Swollman 58820094Swollman 58920094Swollman# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 59020094Swollman 59117200Swollman# From Paul Eggert (1996-06-12): 59217200Swollman# Shanks writes that since 1970 most of this region has been like Halifax. 59317200Swollman# Many locales did not observe peacetime DST until 1972; 59417200Swollman# Glace Bay, NS is the largest that we know of. 59517200Swollman# Shanks also writes that Liverpool, NS was the only town in Canada to observe 59617200Swollman# DST in 1971 but not 1970; for now we'll assume this is a typo. 59717200Swollman 5982742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5992742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 6002742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 6012742SwollmanRule Halifax 1918 only - Apr 14 2:00 1:00 D 6022742SwollmanRule Halifax 1918 only - Oct 31 2:00 0 S 6032742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 6042742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 6052742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 6062742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 6072742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 6082742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 6092742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 6102742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 6112742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 6122742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 6132742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 6142742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 6152742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 6162742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 6172742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 6182742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 6192742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 6202742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 6212742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 6222742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 6232742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 6242742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 6252742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 6262742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 6272742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 6282742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 6292742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 6302742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 6312742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 6322742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 6332742SwollmanRule Halifax 1942 only - Feb 9 2:00 1:00 D 6342742SwollmanRule Halifax 1945 1959 - Sep lastSun 2:00 0 S 6352742SwollmanRule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 6362742SwollmanRule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 6372742SwollmanRule Halifax 1962 max - Oct lastSun 2:00 0 S 6382742SwollmanRule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 6392742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6402742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 6412742Swollman -4:00 Halifax A%sT 64217200SwollmanZone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 64317200Swollman -4:00 Canada A%sT 1953 64417200Swollman -4:00 Halifax A%sT 1954 64517200Swollman -4:00 - AST 1972 64617200Swollman -4:00 Halifax A%sT 6472742Swollman 6488029Swollman 64917200Swollman# Ontario, Quebec 65017200Swollman 65117200Swollman# From Paul Eggert (1996-06-12): 65217200Swollman# Shanks writes that since 1970 most of this region has been like Montreal. 65317200Swollman# Thunder Bay skipped DST in 1973. 65417200Swollman# Many smaller locales did not observe peacetime DST until 1974; 65517200Swollman# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 65617200Swollman# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 65717200Swollman 65843014Swollman# From Paul Eggert (1997-10-17): 65943014Swollman# msb@sq.com writes that an article in the 1997-10-14 Toronto Star 66043014Swollman# says that Atikokan, Ontario currently does not observe DST, 66143014Swollman# but will vote on 11-10 whether to use EST/EDT. 66243014Swollman# He also writes that the 66343014Swollman# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 66443014Swollman# Ontario Time Act (1990, Chapter T.9) 66543014Swollman# </a> 66643014Swollman# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 66743014Swollman# Officially Atikokan is therefore on CST/CDT, and most likely this report 66843014Swollman# concerns a non-official time observed as a matter of local practice. 66943014Swollman# For what it's worth, Shanks (1995) says that Atikokan has agreed with 67043014Swollman# Rainy River ever since standard time was introduced. 67143014Swollman 6722742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6732742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 6742742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 6752742SwollmanRule Mont 1918 only - Apr 14 2:00 1:00 D 6762742SwollmanRule Mont 1918 only - Oct 31 2:00 0 S 6772742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 6782742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 6792742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 6802742SwollmanRule Mont 1920 only - Oct 3 2:30 0 S 6812742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 6822742SwollmanRule Mont 1921 only - Oct 2 2:30 0 S 6832742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 6842742SwollmanRule Mont 1922 only - Oct 1 2:30 0 S 6852742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 6862742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 6872742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 6882742SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 6892742SwollmanRule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 6902742SwollmanRule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 6912742SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 6922742SwollmanRule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 6932742SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 6942742SwollmanRule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 6952742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 6962742SwollmanRule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 6972742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 6982742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 6992742SwollmanRule Mont 1957 max - Oct lastSun 2:00 0 S 7002742SwollmanRule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 7012742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7022742SwollmanZone America/Montreal -4:54:16 - LMT 1884 7032742Swollman -5:00 Mont E%sT 70417200SwollmanZone America/Thunder_Bay -5:57:00 - LMT 1895 70517200Swollman -5:00 Canada E%sT 1970 70617200Swollman -5:00 Mont E%sT 1973 70717200Swollman -5:00 - EST 1974 70817200Swollman -5:00 Canada E%sT 70917200SwollmanZone America/Nipigon -5:53:04 - LMT 1895 71017200Swollman -5:00 Canada E%sT 71117200SwollmanZone America/Rainy_River -6:17:56 - LMT 1895 71217200Swollman -6:00 Canada C%sT 7132742Swollman 7148029Swollman 71517200Swollman# Manitoba 71619878Swollman 7172742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7182742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 7192742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 7202742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 7212742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 7222742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 72314343SwollmanRule Winn 1937 only - Sep 26 2:00 0 S 7242742SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 D 7252742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 7262742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 7272742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 7282742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 72914343SwollmanRule Winn 1947 1949 - Sep lastSun 2:00 0 S 73014343SwollmanRule Winn 1950 only - May 1 2:00 1:00 D 73114343SwollmanRule Winn 1950 only - Sep 30 2:00 0 S 73214343SwollmanRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 73314343SwollmanRule Winn 1951 1958 - Sep lastSun 2:00 0 S 7342742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 7352742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 7362742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 73714343SwollmanRule Winn 1963 only - Sep 22 2:00 0 S 7382742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 73914343SwollmanRule Winn 1966 max - Oct lastSun 2:00 0 S 7402742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 7412742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7422742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 7432742Swollman -6:00 Winn C%sT 7442742Swollman 7458029Swollman 74617200Swollman# Saskatchewan 74717200Swollman 74817200Swollman# From Paul Eggert (1996-06-12): 74917200Swollman# Shanks writes that since 1970 most of this region has been like Regina. 75017200Swollman# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 75117200Swollman# Other western towns (e.g. Lloydminster) are like Edmonton. 75217200Swollman 75319878Swollman# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 75417200Swollman# The. . .below is based on information I got from our law library, the 75517200Swollman# provincial archives, and the provincial Community Services department. 75617200Swollman# A precise history would require digging through newspaper archives, and 75717200Swollman# since you didn't say what you wanted, I didn't bother. 75817200Swollman# 75917200Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 76017200Swollman# the boundary became pretty ragged as communities near it reevaluated 76117200Swollman# their affiliations in one direction or the other. In 1965 a provincial 76217200Swollman# referendum favoured legislating common time practices. 76317200Swollman# 76417200Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 76517200Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 76617200Swollman# part of Saskatchewan would use CST year round, that districts in 76717200Swollman# northwest Saskatchewan would by default follow CST but could opt to 76817200Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 76917200Swollman# zero in the summer), and that districts in southwest Saskatchewan would 77017200Swollman# by default follow MT but could opt to follow CST. 77117200Swollman# 77217200Swollman# It took a few years for the dust to settle (I know one story of a town 77317200Swollman# on one time zone having its school in another, such that a mom had to 77417200Swollman# serve her family lunch in two shifts), but presently it seems that only 77517200Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 77617200Swollman# rules any more; all other districts appear to have used CST year round 77717200Swollman# since sometime in the 1960s. 77817200Swollman 7792742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7802742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 7812742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 7822742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 7832742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 7842742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 7852742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 7862742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 7872742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 7882742SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 D 7892742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 79017200SwollmanRule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 79117200SwollmanRule Regina 1946 only - Oct Sun>=8 2:00 0 S 79217200SwollmanRule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 79317200SwollmanRule Regina 1947 1958 - Sep lastSun 2:00 0 S 79417200SwollmanRule Regina 1959 only - Oct lastSun 2:00 0 S 79517200Swollman# 79617200SwollmanRule Swift 1957 only - Apr lastSun 2:00 1:00 D 79717200SwollmanRule Swift 1957 only - Oct lastSun 2:00 0 S 79817200SwollmanRule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 79917200SwollmanRule Swift 1959 only - Oct lastSun 2:00 0 S 80017200SwollmanRule Swift 1960 1961 - Sep lastSun 2:00 0 S 8012742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 80217200SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 80317200Swollman -7:00 Regina M%sT 1960 Apr lastSun 2:00 8042742Swollman -6:00 - CST 80517200SwollmanZone America/Swift_Current -7:11:20 - LMT 1905 Sep 80617200Swollman -7:00 Canada M%sT 1946 Apr lastSun 2:00 80717200Swollman -7:00 Regina M%sT 1950 80817200Swollman -7:00 Swift M%sT 1972 Apr lastSun 2:00 80917200Swollman -6:00 - CST 8102742Swollman 8118029Swollman 81217200Swollman# Alberta 81317200Swollman 8142742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8152742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 8162742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 8172742SwollmanRule Edm 1919 only - May 27 2:00 0 S 8182742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 8192742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 8202742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 8212742SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 D 8222742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 8232742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 8242742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 8252742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 8262742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 8272742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 8282742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 8292742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 8302742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 8312742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 8322742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8332742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 8342742Swollman -7:00 Edm M%sT 8352742Swollman 8368029Swollman 83717200Swollman# British Columbia 83817200Swollman 83917200Swollman# From Paul Eggert (1996-06-12): 84017200Swollman# Shanks writes that since 1970 most of this region has been like Vancouver. 84117200Swollman# Dawswon Creek uses MST. Much of east BC is like Edmonton. 84217200Swollman 8432742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8442742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 8452742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 8462742SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 D 8472742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 8482742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 8492742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 8502742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 8512742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 8522742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 8532742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8542742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 8552742Swollman -8:00 Vanc P%sT 85617200SwollmanZone America/Dawson_Creek -8:00:56 - LMT 1884 85717200Swollman -8:00 Canada P%sT 1947 85817200Swollman -8:00 Vanc P%sT 1972 Aug 30 2:00 85917200Swollman -7:00 - MST 8602742Swollman 8618029Swollman 86217200Swollman# Northwest Territories, Yukon 86317200Swollman 86420094Swollman# From Paul Eggert (1996-10-07): 86517200Swollman# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 86617200Swollman# Shanks's table for Watson Lake is corrupted, so we have no data there. 86720094Swollman# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 86820094Swollman# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 86920094Swollman# c. 7 defines Yukon standard time as UTC-9. This is still valid; 87020094Swollman# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 87120094Swollman# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 87220094Swollman# * O.I.C. 1980/02 established DST. 87320094Swollman# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 87420094Swollman# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 87517200Swollman 8762742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 87717200SwollmanRule NT_YK 1918 only - Apr 14 2:00 1:00 D 87817200SwollmanRule NT_YK 1918 only - Oct 27 2:00 0 S 87917200SwollmanRule NT_YK 1919 only - May 25 2:00 1:00 D 88017200SwollmanRule NT_YK 1919 only - Nov 1 0:00 0 S 88117200SwollmanRule NT_YK 1942 only - Feb 9 2:00 1:00 D 88217200SwollmanRule NT_YK 1945 only - Sep 30 2:00 0 S 88317200SwollmanRule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 88417200SwollmanRule NT_YK 1965 only - Oct lastSun 2:00 0 S 88517200SwollmanRule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 88617200SwollmanRule NT_YK 1980 max - Oct lastSun 2:00 0 S 88717200SwollmanRule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 8882742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 88917200SwollmanZone America/Pangnirtung -4:22:56 - LMT 1884 89017200Swollman -4:00 NT_YK A%sT 89117200SwollmanZone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay 89217200Swollman -5:00 NT_YK E%sT 89317200SwollmanZone America/Rankin_Inlet -6:08:40 - LMT 1884 89417200Swollman -6:00 NT_YK C%sT 89517200SwollmanZone America/Yellowknife -7:37:24 - LMT 1884 89617200Swollman -7:00 NT_YK M%sT 89717200SwollmanZone America/Inuvik -8:54:00 - LMT 1884 89817200Swollman -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 89917200Swollman -7:00 NT_YK M%sT 9002742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 90117200Swollman -9:00 NT_YK Y%sT 1966 Jul 1 2:00 90217200Swollman -8:00 NT_YK P%sT 90317200SwollmanZone America/Dawson -9:17:40 - LMT 1900 Aug 20 90420094Swollman -9:00 NT_YK Y%sT 1973 Oct 28 0:00 90517200Swollman -8:00 NT_YK P%sT 9062742Swollman 9078029Swollman 9082742Swollman############################################################################### 9092742Swollman 9102742Swollman# Mexico 9112742Swollman 9122742Swollman# From Guy Harris: 9132742Swollman# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 91443014Swollman# Rules [before] 1987 are unknown. 9152742Swollman# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 9162742Swollman# observe DST." This is presumably Baja California Norte, above 28th parallel, 91714343Swollman# as listed there; [there is also] "Baja California Sur and N. Pacific 9182742Swollman# Coast (States of Sinaloa and Sonora)." 9192742Swollman 92019878Swollman# From Bob Devine (1988-01-28): 9212742Swollman# The Federal District (where Mexico City is) has observed [DST] several 9222742Swollman# times but not recently. 9232742Swollman# 9242742Swollman# I don't where to drawn the line in the North Baja area. 28th latitude 9252742Swollman# sounds good -- but it may be higher (how far [d]o radio stations from 9262742Swollman# San Diego affect culture?). 9272742Swollman# 9282742Swollman# The dates of DST probably go back to 1981. The rules are the same as 9292742Swollman# US's. This is going to be a headache for US presidential electi[o]n years! 9302742Swollman 93119878Swollman# From Arthur David Olson (1988-02-13) 9322742Swollman# Since the 1981 starting date is only "probable," we'll keep the 1987 9332742Swollman# starting date below. 9342742Swollman 93519878Swollman# From U. S. Naval Observatory (1989-01-19): 9362742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 9372742Swollman# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 9382742Swollman# MEXICO BAJA CAL N OF SINALOA AND SONORA) 93921217Swollman# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 9402742Swollman# MEXICO BAJA CAL N - OCT 29 94121217Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 9422742Swollman# MEXICO BAJA CAL N - 0CT 29 9432742Swollman# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 9442742Swollman# MEXICO COAHUILA, NUEVO LEON, 9452742Swollman# MEXICO TAMAULIPAS 9462742Swollman# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 9472742Swollman# MEXICO COAHUILA, NUEVO LEON, 9482742Swollman# MEXICO TAMAULIPAS APR 3 - OCT 29 9492742Swollman# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 9502742Swollman# MEXICO CAMPECHE, QUINTANA ROO AND 9512742Swollman# MEXICO YUCATAN 9522742Swollman 95319878Swollman# From Arthur David Olson (1989-01-21): 9542742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 9552742Swollman# USNO claims there should be four Mexican zones rather than three: 9562742Swollman# a zone that's GMT-8 with DST; a zone that's always GMT-7; 9572742Swollman# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 9582742Swollman 95917200Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 9602742Swollman# Shanks also says there are four zones, but disagrees about the fourth. 9612742Swollman# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 9622742Swollman 96317200Swollman# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 96417200Swollman# A guy from our Mexico subsidiary finally found the Presidential Decree 96517200Swollman# outlining the timezone changes in Mexico. 96617200Swollman# 96717200Swollman# ------------- Begin Forwarded Message ------------- 96817200Swollman# 96917200Swollman# I finally got my hands on the Official Presidential Decree that sets up the 97017200Swollman# rules for the DST changes. The rules are: 97117200Swollman# 97217200Swollman# 1. The country is divided in 3 timezones: 97317200Swollman# - Baja California Norte (the Mexico/BajaNorte TZ) 97417200Swollman# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 97517200Swollman# - The rest of the country (the Mexico/General TZ) 97617200Swollman# 97717200Swollman# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 97817200Swollman# at 2:00 AM, the times in each zone are as follows: 97917200Swollman# BajaNorte: GMT+7 98017200Swollman# BajaSur: GMT+6 98117200Swollman# General: GMT+5 98217200Swollman# 98317200Swollman# 3. The rest of the year, the times are as follows: 98417200Swollman# BajaNorte: GMT+8 98517200Swollman# BajaSur: GMT+7 98617200Swollman# General: GMT+6 98717200Swollman# 98817200Swollman# The Decree was published in Mexico's Official Newspaper on January 4th. 98917200Swollman# 99017200Swollman# -------------- End Forwarded Message -------------- 99117200Swollman# From Paul Eggert (1996-06-12): 99243014Swollman# For an English translation of the decree, see 99343014Swollman# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 99443014Swollman# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 99543014Swollman# </a> 99614343Swollman 99743543Swollman# From Rives McDow (1998-10-08): 99843543Swollman# The State of Quintana Roo has reverted back to central STD and DST times 99943543Swollman# (i.e. UTC -0600 and -0500 as of 1998-08-02). 100043543Swollman 10012742Swollman# From Shanks (1991): 10022742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10032742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 10042742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 10052742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 10062742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 10072742SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 D 10082742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 10092742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 10102742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 101114343SwollmanRule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 101214343SwollmanRule Mexico 1996 max - Oct lastSun 2:00 0 S 101314343Swollman# 10142742SwollmanRule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 10152742SwollmanRule BajaN 1950 1961 - Sep lastSun 2:00 0 S 10162742SwollmanRule BajaN 1961 1966 - Oct lastSun 2:00 0 S 10172742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 101843014Swollman# Quintana Roo 101943014SwollmanZone America/Cancun -5:47:04 - LMT 1922 Jan 1 1:12:42 102043014Swollman -6:00 - CST 1996 102143014Swollman -6:00 Mexico C%sT 1997 Oct lastSun 2:00 102243543Swollman -5:00 Mexico E%sT 1998 Aug 2 2:00 102343543Swollman -6:00 Mexico C%sT 102443014Swollman# Central Mexico 10252742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 10262742Swollman -7:00 - MST 1927 Jun 10 23:00 10272742Swollman -6:00 - CST 1930 Nov 15 10282742Swollman -7:00 - MST 1931 May 1 23:00 10292742Swollman -6:00 - CST 1931 Oct 10302742Swollman -7:00 - MST 1932 Mar 30 23:00 10312742Swollman -6:00 Mexico C%sT 103243014Swollman# Chihuahua 103343014SwollmanZone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:44 103443014Swollman -7:00 - MST 1927 Jun 10 23:00 103543014Swollman -6:00 - CST 1930 Nov 15 103643014Swollman -7:00 - MST 1931 May 1 23:00 103743014Swollman -6:00 - CST 1931 Oct 103843014Swollman -7:00 - MST 1932 Mar 30 23:00 103943014Swollman -6:00 - CST 1996 104043014Swollman -6:00 Mexico C%sT 1998 104143014Swollman -6:00 - CST 1998 Apr Sun>=1 3:00 104243014Swollman -7:00 Mexico M%sT 104343014Swollman# S Baja California, Nayarit, Sinaloa, Sonora 10442742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 10452742Swollman -7:00 - MST 1927 Jun 10 23:00 10462742Swollman -6:00 - CST 1930 Nov 15 10472742Swollman -7:00 - MST 1931 May 1 23:00 10482742Swollman -6:00 - CST 1931 Oct 10492742Swollman -7:00 - MST 1932 Mar 30 23:00 10502742Swollman -6:00 - CST 1942 Apr 10512742Swollman -7:00 - MST 1949 Jan 14 10522742Swollman -8:00 - PST 1970 105314343Swollman -7:00 Mexico M%sT 105443014Swollman# N Baja California 10552742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 10562742Swollman -8:00 - PST 1927 Jun 10 23:00 10572742Swollman -7:00 - MST 1930 Nov 16 10582742Swollman -8:00 - PST 1942 Apr 10592742Swollman -7:00 - MST 1949 Jan 14 10602742Swollman -8:00 BajaN P%sT 1967 Apr lastSun 2:00 106114343Swollman -8:00 US P%sT 1996 106214343Swollman -8:00 Mexico P%sT 106343014Swollman# Baja California 10642742SwollmanZone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 10652742Swollman -8:00 - PST 1927 Jun 10 23:00 10662742Swollman -7:00 - MST 1930 Nov 16 10672742Swollman -8:00 - PST 1942 Apr 10682742Swollman -7:00 - MST 1949 Jan 14 106914343Swollman -8:00 - PST 1996 107014343Swollman -8:00 Mexico P%sT 10712742Swollman# 10722742Swollman# Revillagigedo Is 10732742Swollman# no information 10742742Swollman 10752742Swollman############################################################################### 10762742Swollman 10772742Swollman# Anguilla 10782742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10792742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 10802742Swollman -4:00 - AST 10812742Swollman 10822742Swollman# Antigua and Barbuda 10832742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10842742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 10852742Swollman -5:00 - EST 1951 10862742Swollman -4:00 - AST 10872742Swollman 10882742Swollman# Bahamas 10892742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10902742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 10912742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 10922742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 10932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10942742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 10952742Swollman -5:00 Bahamas E%sT 10962742Swollman 10972742Swollman# Barbados 10982742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10992742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 11002742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 11012742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 11022742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 11032742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 11042742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11052742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 110643014Swollman -3:58:28 - BMT 1932 # Bridgetown Mean Time 11072742Swollman -4:00 Barb A%sT 11082742Swollman 11092742Swollman# Belize 11102742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 11112742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11122742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 11132742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 11142742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 11152742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 11162742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 11172742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 11182742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11192742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 11202742Swollman -6:00 Belize C%sT 11212742Swollman 11222742Swollman# Bermuda 11232742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11242742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 11252742Swollman -4:00 - AST 1974 Apr 28 2:00 11262742Swollman -4:00 Bahamas A%sT 11272742Swollman 11282742Swollman# Cayman Is 11292742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11302742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 113143014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 11322742Swollman -5:00 - EST 11332742Swollman 11342742Swollman# Costa Rica 11352742Swollman# Shanks gives some very odd dates for 1991, and stops there. 11362742Swollman# For now, we won't guess further. 11372742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11382742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 11392742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 114020094SwollmanRule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 114120094Swollman# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 114220094SwollmanRule CR 1991 only - Jul 1 0:00 0 S 114320094SwollmanRule CR 1992 only - Mar 15 0:00 0 S 11442742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 11452742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11462742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 11472742Swollman -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 11482742Swollman -6:00 CR C%sT 11492742Swollman# Coco 11502742Swollman# no information; probably like America/Costa_Rica 11512742Swollman 11522742Swollman# Cuba 11532742Swollman 115419878Swollman# From Bob Devine (1988-01-28): 11552742Swollman# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 11562742Swollman# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 11572742Swollman# (I think). 11582742Swollman 115919878Swollman# From U. S. Naval Observatory (1989-01-19): 11602742Swollman# CUBA 5 H BEHIND UTC 11612742Swollman# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 11622742Swollman 11632742Swollman# From Shanks (1991): 11642742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11652742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 11662742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 11672742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 11682742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 11692742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 11702742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 11712742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 11722742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 11732742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 11742742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 11752742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 11762742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 11772742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 11782742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 11792742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 11802742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 11812742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 11822742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 118330711SwollmanRule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 11842742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 11852742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 11862742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 118743014SwollmanRule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 118820094SwollmanRule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 118943014SwollmanRule Cuba 1996 only - Oct 6 0:00s 0 S 119043014SwollmanRule Cuba 1997 only - Oct 12 0:00s 0 S 119143014SwollmanRule Cuba 1998 only - Mar 29 0:00 1:00 D 119243014SwollmanRule Cuba 1998 max - Oct lastSun 0:00s 0 S 119343014SwollmanRule Cuba 1999 max - Apr Sun>=1 0:00s 1:00 D 11942742Swollman 11952742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11962742SwollmanZone America/Havana -5:29:28 - LMT 1890 11972742Swollman -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 11982742Swollman -5:00 Cuba C%sT 11992742Swollman 12002742Swollman# Dominica 12012742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12022742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 12032742Swollman -4:00 - AST 12042742Swollman 12052742Swollman# Dominican Republic 12062742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12072742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 12082742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 12092742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 12102742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 12112742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 12122742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 12132742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12142742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 12152742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 12162742Swollman -5:00 DR E%sT 1974 Oct 27 12172742Swollman -4:00 - AST 12182742Swollman 12192742Swollman# El Salvador 12202742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12212742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 12222742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 12232742Swollman# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 12242742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12252742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 12262742Swollman -6:00 Salv C%sT 12272742Swollman 12282742Swollman# Grenada 12292742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 123019878SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 12312742Swollman -4:00 - AST 12322742Swollman 12332742Swollman# Guadeloupe 12342742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12352742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 12362742Swollman -4:00 - AST 12372742Swollman 12382742Swollman# Guatemala 12392742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12402742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 12412742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 12422742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 12432742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 124420094SwollmanRule Guat 1991 only - Mar 23 0:00 1:00 D 124520094SwollmanRule Guat 1991 only - Sep 7 0:00 0 S 12462742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12472742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 12482742Swollman -6:00 Guat C%sT 12492742Swollman 12502742Swollman# Haiti 12512742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12522742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 12532742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 12542742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 125520094Swollman# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA. 125643014SwollmanRule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 125743014SwollmanRule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 12582742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12592742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 12602742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 12612742Swollman -5:00 Haiti E%sT 12622742Swollman 12632742Swollman# Honduras 12642742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 12652742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12662742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 12672742Swollman -6:00 Salv C%sT 126843543Swollman# 126943543Swollman# Great Swan I ceded by US to Honduras in 1972 12702742Swollman 12712742Swollman# Jamaica 12722742Swollman 127319878Swollman# From Bob Devine (1988-01-28): 12742742Swollman# Follows US rules. 12752742Swollman 127619878Swollman# From U. S. Naval Observatory (1989-01-19): 12772742Swollman# JAMAICA 5 H BEHIND UTC 12782742Swollman 12792742Swollman# From Shanks (1991): 12802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12812742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 128243014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 12832742Swollman -5:00 - EST 1974 Jan 6 2:00 128420094Swollman -5:00 US E%sT 1984 128520094Swollman -5:00 - EST 12862742Swollman 12872742Swollman# Martinique 12882742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12892742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 12902742Swollman -4:04 - FFMT 1911 May # Fort-de-France MT 12912742Swollman -4:00 - AST 1980 Apr 6 12922742Swollman -4:00 1:00 ADT 1980 Sep 28 12932742Swollman -4:00 - AST 12942742Swollman 12952742Swollman# Montserrat 129630711Swollman# From Paul Eggert (1997-08-31): 129730711Swollman# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 129830711Swollman# Luckily, Olveston, the current de facto capital, has the same longitude. 12992742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 130030711SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 13012742Swollman -4:00 - AST 13022742Swollman 13032742Swollman# Nicaragua 130443543Swollman# 130543543Swollman# From Steffen Thorsen (1998-12-29): 130643543Swollman# Nicaragua seems to be back at -6:00 but I have not been able to find when 130743543Swollman# they changed from -5:00. 130843543Swollman# 13092742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 13102742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 13112742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 131220094SwollmanRule Nic 1992 only - Jan 1 4:00 1:00 D 131320094SwollmanRule Nic 1992 only - Sep 24 0:00 0 S 13142742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13152742SwollmanZone America/Managua -5:45:08 - LMT 1890 13162742Swollman -5:45 - MMT 1934 Jun 23 # Managua Mean Time 13172742Swollman -6:00 - CST 1973 May 13182742Swollman -5:00 - EST 1975 Feb 16 131920094Swollman -6:00 Nic C%sT 1993 Jan 1 4:00 132043543Swollman -5:00 - EST 1998 Dec 132143543Swollman -6:00 - CST 13222742Swollman 13232742Swollman# Panama 13242742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13252742SwollmanZone America/Panama -5:18:08 - LMT 1890 13262742Swollman -5:20 - PMT 1908 Apr 22 # Panama Mean Time 13272742Swollman -5:00 - EST 13282742Swollman 13292742Swollman# Puerto Rico 13302742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 13312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 133214343SwollmanZone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 13332742Swollman -4:00 - AST 1942 May 3 133414343Swollman -4:00 1:00 AWT 1945 Sep 30 2:00 13352742Swollman -4:00 - AST 13362742Swollman 13372742Swollman# St Kitts-Nevis 13382742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13392742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 13402742Swollman -4:00 - AST 13412742Swollman 13422742Swollman# St Lucia 13432742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13442742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 13452742Swollman -4:04 - CMT 1912 # Castries Mean Time 13462742Swollman -4:00 - AST 13472742Swollman 13482742Swollman# St Pierre and Miquelon 13492742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 13502742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13512742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 13522742Swollman -4:00 - AST 1980 May 135319878Swollman -3:00 Mont PM%sT # Pierre & Miquelon Time 13542742Swollman 13552742Swollman# St Vincent and the Grenadines 13562742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13572742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 135843014Swollman -4:04:56 - KMT 1912 # Kingstown Mean Time 13592742Swollman -4:00 - AST 13602742Swollman 13612742Swollman# Turks and Caicos 136243014Swollman# From Paul Eggert (1998-08-06): 136343014Swollman# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 136420094Swollman# says they switch at midnight. Go with IATA SSIM. 136520094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 136620094SwollmanRule TC 1979 1986 - Apr lastSun 0:00 1:00 D 136720094SwollmanRule TC 1979 max - Oct lastSun 0:00 0 S 136820094SwollmanRule TC 1987 max - Apr Sun>=1 0:00 1:00 D 13692742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13702742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 137143014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 137220094Swollman -5:00 TC E%sT 13738029Swollman 137414343Swollman# British Virgin Is 13752742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 137614343SwollmanZone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 13772742Swollman -4:00 - AST 13788029Swollman 137914343Swollman# Virgin Is 138014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 138114343SwollmanZone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 138214343Swollman -4:00 - AST 1383