northamerica revision 8049
12742Swollman# @(#)northamerica 7.11 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 172742Swollman# From Arthur David Olson: 182742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 192742Swollman# See, for example, the front page of the Saturday, October 26, 1974 202742Swollman# and Sunday, October 27, 1974 editions of the Washington Post. 212742Swollman 222742Swollman# From seismo!munnari!kre: 232742Swollman# I recall also being told by someone once that Canada didn't have 242742Swollman# the DST variations in 74/75 that the US did, but I am not nearly 252742Swollman# sure enough of this to add anything. 262742Swollman 272742Swollman# From Arthur David Olson: 282742Swollman# The above has been confirmed by Bob Devine; we'll go with it here. 292742Swollman 302742Swollman# From Arthur David Olson: 312742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 322742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 332742Swollman 342742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 352742SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 D 362742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 372742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 382742SwollmanRule US 1945 only - Sep 30 2:00 0 S 392742SwollmanRule US 1967 max - Oct lastSun 2:00 0 S 402742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 412742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 422742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 432742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 442742SwollmanRule US 1987 max - Apr Sun>=1 2:00 1:00 D 452742Swollman 462742Swollman# From Bob Devine (January 28, 1988): 472742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 482742Swollman# old new 492742Swollman# Pacific Standard Time(PST) -same- 502742Swollman# Yukon Standard Time(YST) -same- 512742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 522742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 532742Swollman# 542742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 552742Swollman# The YST zone now covers nearly all of the state, AHST just part 562742Swollman# of the Aleutian islands. No DST. 572742Swollman 582742Swollman# From U. S. Naval Observatory (January 19, 1989): 592742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 602742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 612742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 622742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 632742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 642742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 652742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 662742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 672742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 682742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 692742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 702742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 712742Swollman# USA HAWAII 10 H BEHIND UTC 722742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 732742Swollman 742742Swollman# From Arthur David Olson (January 21, 1989): 752742Swollman# The above dates are for 1988. 762742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 772742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 782742Swollman# Aleutians. 792742Swollman 802742Swollman# From Arthur David Olson (February 13, 1988): 812742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 822742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 832742Swollman# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 842742Swollman# took effect), as explained in sections 263 and 261: 852742Swollman# (none) 862742Swollman# United States standard eastern time 872742Swollman# United States standard mountain time 882742Swollman# United States standard central time 892742Swollman# United States standard Pacific time 902742Swollman# (none) 912742Swollman# United States standard Alaska time 922742Swollman# (none) 932742Swollman# Next, names from April 1, 1967 until November 30, 1983 (the date for 942742Swollman# public law 98-181): 952742Swollman# Atlantic standard time 962742Swollman# eastern standard time 972742Swollman# central standard time 982742Swollman# mountain standard time 992742Swollman# Pacific standard time 1002742Swollman# Yukon standard time 1012742Swollman# Alaska-Hawaii standard time 1022742Swollman# Bering standard time 1032742Swollman# And after November 30, 1983: 1042742Swollman# Atlantic standard time 1052742Swollman# eastern standard time 1062742Swollman# central standard time 1072742Swollman# mountain standard time 1082742Swollman# Pacific standard time 1092742Swollman# Alaska standard time 1102742Swollman# Hawaii-Aleutian standard time 1112742Swollman# Samoa standard time 1122742Swollman# The law doesn't give abbreviations. 1132742Swollman 1142742Swollman# From Paul Eggert <eggert@twinsun.com> (August 16, 1994): 1152742Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 1162742Swollman# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 1172742Swollman# from Russia. We don't have this data pinned down yet, though. 1182742Swollman 1192742Swollman# Easy stuff first--including Alaska, where we ignore history (since we 1202742Swollman# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" 1212742Swollman# times). 1222742Swollman 1232742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1242742SwollmanZone America/New_York -5:00 US E%sT 1252742SwollmanZone America/Chicago -6:00 US C%sT 1262742SwollmanZone America/Denver -7:00 US M%sT 1272742SwollmanZone America/Los_Angeles -8:00 US P%sT 1282742SwollmanZone America/Anchorage -9:00 US AK%sT 1292742Swollman # AK%sT is the abbreviation per USNO 1302742Swollman 1318029Swollman# ZONE-DESCR America New_York United_States Eastern time (except Indiana and Michigan) 1328029Swollman# ZONE-DESCR America Chicago United_States Central time 1338029Swollman# ZONE-DESCR America Denver United_States Mountain time (except Arizona) 1348029Swollman# ZONE-DESCR America Los_Angeles United_States Pacific time 1358029Swollman# ZONE-DESCR America Anchorage United_States Alaska time 1368029Swollman 1372742Swollman# Mainland US areas that are always Standard as of 1986. 1382742Swollman 1392742SwollmanZone America/Fort_Wayne -5:00 US E%sT 1946 1402742Swollman -5:00 - EST # Always EST as of 1986 1418029Swollman 1422742Swollman# From Arthur David Olson (October 28, 1991): 1432742Swollman# An article on page A3 of the Sunday, October 27, 1991 Washington Post 1442742Swollman# notes that Starke County switched from Central time to Eastern time as of 1452742Swollman# October 27, 1991. 1462742SwollmanZone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 1472742Swollman -5:00 - EST # Always EST as of 1991 1482742SwollmanZone America/Phoenix -7:00 US M%sT 1946 1492742Swollman -7:00 - MST # Always MST as of 1986 1502742Swollman 1518029Swollman# ZONE-DESCR America Fort_Wayne United_States Indiana (except Starke County) 1528029Swollman# ZONE-DESCR America Knox_IN United_States Indiana (Starke County) 1538029Swollman# ZONE-DESCR America Phoenix United_States Arizona (except Navajo Nation) 1548049Swollman# ZONE-DESCR America Navajo United_States Arizona (Navajo Nation) 1558029Swollman 1562742Swollman# From Arthur David Olson (February 13, 1988): 1572742Swollman# However. . .a writer from the Inter Tribal Council of Arizona, Inc., 1582742Swollman# notes in private correspondence dated 12/28/87 that "Presently, only the 1592742Swollman# Navajo Nation participates in the Daylight Saving Time policy, due to its 1602742Swollman# large size and location in three states." (The "only" means that other 1612742Swollman# tribal nations don't use DST.) 1622742Swollman 1638049SwollmanLink America/Denver America/Navajo 1642742Swollman 1652742Swollman# From Bob Devine (January 28, 1988): 1662742Swollman# Michigan didn't observe DST from 1968 to 1973. 1672742Swollman 1682742SwollmanZone America/Detroit -5:00 US E%sT 1968 1692742Swollman -5:00 - EST 1973 1702742Swollman -5:00 US E%sT 1712742Swollman 1728029Swollman# ZONE-DESCR America Detroit United_States Michigan 1738029Swollman 1742742Swollman# Samoa just changes names. No DST, per Naval Observatory. 1752742Swollman# 1762742Swollman# Howse writes that in 1879 the King of Samoa decided to change 1772742Swollman# ``the date in his kingdom from the Antipodean to the American system, 1782742Swollman# ordaining -- by a masterpiece of diplomatic flattery -- that 1792742Swollman# the Fourth of July should be celebrated twice in that year.'' 1802742Swollman 1818049SwollmanZone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 1822742Swollman -11:22:48 - LMT 1911 1832742Swollman -11:30 - SST 1950 1842742Swollman -11:00 - NST 1967 Apr # N=Nome 1852742Swollman -11:00 - BST 1983 Nov 30 # B=Bering 1862742Swollman -11:00 - SST # S=Samoa 1872742Swollman 1882742SwollmanZone Pacific/Midway -11:49:28 - LMT 1901 1892742Swollman -11:00 - NST 1967 Apr # N=Nome 1902742Swollman -11:00 - BST 1983 Nov 30 # B=Bering 1912742Swollman -11:00 - SST # S=Samoa 1922742Swollman 1932742Swollman# Aleutian has a name change. DST, per Naval Observatory. 1942742Swollman 1952742SwollmanZone America/Atka -10:00 US AH%sT 1983 Nov 30 1962742Swollman -10:00 US HA%sT 1972742Swollman 1982742Swollman# From Arthur David Olson: 1992742Swollman# And then there's Hawaii. 2002742Swollman# DST was observed for one day in 1933; 2012742Swollman# Standard time was change by half an hour in 1947; 2022742Swollman# it's always standard as of 1986. 2032742Swollman 2042742SwollmanZone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 2052742Swollman -10:30 1:00 HDT 1933 May 1 2:00 2062742Swollman -10:30 US H%sT 1947 Jun 8 2:00 2072742Swollman -10:00 - HST 2082742Swollman 2098049Swollman# Same time in American and Western Samoa 2108049SwollmanLink Pacific/Pago_Pago Pacific/Apia 2118049Swollman 2128049Swollman# ZONE-DESCR Pacific Pago_Pago United_States American Samoa 2138049Swollman# ZONE-DESCR Pacific Apia Western_Samoa All points 2148029Swollman# ZONE-DESCR Pacific Midway United_States Midway Island 2158029Swollman# ZONE-DESCR America Atka United_States Aleutian Islands 2168029Swollman# ZONE-DESCR Pacific Honolulu United_States Hawaii 2178029Swollman 2182742Swollman# Navassa 2192742Swollman# no information; probably like US/Eastern 2202742Swollman 2212742Swollman 2222742Swollman# Old names, for S5 users 2232742Swollman 2242742Swollman# Link LINK-FROM LINK-TO 2252742SwollmanLink America/New_York EST5EDT 2262742SwollmanLink America/Chicago CST6CDT 2272742SwollmanLink America/Denver MST7MDT 2282742SwollmanLink America/Los_Angeles PST8PDT 2292742SwollmanLink America/Fort_Wayne EST 2302742SwollmanLink America/Phoenix MST 2312742SwollmanLink Pacific/Honolulu HST 2322742Swollman 2332742Swollman################################################################################ 2342742Swollman 2352742Swollman 2362742Swollman# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 2372742Swollman# A good source for time zone historical data outside the U.S. is 2382742Swollman# Thomas G. Shanks, The International Atlas (3rd edition), 2392742Swollman# San Diego: ACS Publications, Inc. (1991). 2402742Swollman# Except where otherwise noted, it is the source for the data below. 2412742Swollman# 2422742Swollman# Another source occasionally used is Edward W. Whitman, World Time Differences, 2432742Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 2442742Swollman# I found in the UCLA library. 2452742Swollman# 2462742Swollman# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 2472742Swollman# Corrections are welcome! 2482742Swollman# 2492742Swollman# See the `africa' file for Zone naming conventions. 2502742Swollman 2512742Swollman 2522742Swollman 2532742Swollman# Canada 2542742Swollman 2552742Swollman# Canada is reportedly lots easier than the US--leastways since 1951. 2562742Swollman# I don't know what they did before then. 2572742Swollman# 4.3BSD claims that it's perfectly regular. 2582742Swollman# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 2592742Swollman# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 2602742Swollman# "...Canada (well, Ontario and at least some of the other provinces) are 2612742Swollman# adopting the new daylight savings time rules...". We assume all of 2622742Swollman# Canada is doing so. 2632742Swollman 2642742Swollman# From Bob Devine (January 28, 1988): 2652742Swollman# All of Canada did have DST from your first rule except Saskatchewan. 2662742Swollman# Which parts did not observe DST is hard to pinpoint but most of the 2672742Swollman# province follows the rules. 2682742Swollman# NOTE: those that didn't have DST for that rule, also 2692742Swollman# probably did not have it for several years previous. 2702742Swollman 2712742Swollman# From U. S. Naval Observatory (January 19, 1989): 2722742Swollman# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 2732742Swollman# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 2742742Swollman# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 2752742Swollman# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 2762742Swollman# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 2772742Swollman# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 2782742Swollman# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 2792742Swollman# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 2802742Swollman# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 2812742Swollman# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 2822742Swollman# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 2832742Swollman# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 2842742Swollman# CANADA YUKON SAME AS PACIFIC DAWSON 2852742Swollman 2862742Swollman# From Arthur David Olson (January 21, 1989): 2872742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 2882742Swollman# Note claim that there's double DST in Newfoundland and that Yukon should 2892742Swollman# be same as Pacific. 2902742Swollman 2912742Swollman# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 2922742Swollman# The. . .below is based on information I got from our law library, the 2932742Swollman# provincial archives, and the provincial Community Services department. 2942742Swollman# A precise history would require digging through newspaper archives, and 2952742Swollman# since you didn't say what you wanted, I didn't bother. 2962742Swollman# 2972742Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 2982742Swollman# the boundary became pretty ragged as communities near it reevaluated 2992742Swollman# their affiliations in one direction or the other. In 1965 a provincial 3002742Swollman# referendum favoured legislating common time practices. 3012742Swollman# 3022742Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 3032742Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 3042742Swollman# part of Saskatchewan would use CST year round, that districts in 3052742Swollman# northwest Saskatchewan would by default follow CST but could opt to 3062742Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 3072742Swollman# zero in the summer), and that districts in southwest Saskatchewan would 3082742Swollman# by default follow MT but could opt to follow CST. 3092742Swollman# 3102742Swollman# It took a few years for the dust to settle (I know one story of a town 3112742Swollman# on one time zone having its school in another, such that a mom had to 3122742Swollman# serve her family lunch in two shifts), but presently it seems that only 3132742Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 3142742Swollman# rules any more; all other districts appear to have used CST year round 3152742Swollman# since sometime in the 1960s. 3162742Swollman# 3172742Swollman# Here's how I would summarize things. Establish a "Saskatchewan" CST 3182742Swollman# time zone, and note that it officially exists as of 15 April 1966. Any 3192742Swollman# current exceptions can put themselves in the "Mountain" zone, since 3202742Swollman# those are the rules they follow. Any past exceptions can be forgotten, 3212742Swollman# since that's what those who live here have done. 3222742Swollman 3232742Swollman# From Arthur David Olson (November 21, 1992): 3242742Swollman# East-Saskatchewan kept to avoid problems for folks using that zone by name; 3252742Swollman# plain Saskatchewan added. 3262742Swollman 3272742Swollman 3282742Swollman# From Shanks (1991): 3292742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3302742SwollmanRule StJohns 1884 only - Jan 1 0:00 0 S 3312742SwollmanRule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 3322742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 3332742SwollmanRule StJohns 1918 only - Oct 31 2:00 0 S 3342742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 3352742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 3362742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 3372742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 3382742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 3392742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 3402742Swollman# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 3412742SwollmanRule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 3422742SwollmanRule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 3432742Swollman# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 3442742SwollmanRule StJohns 1942 only - Mar 1 0:00 1:00 D 3452742SwollmanRule StJohns 1942 only - Dec 31 0:00 0 S 3462742SwollmanRule StJohns 1943 only - May 30 0:00 1:00 D 3472742SwollmanRule StJohns 1943 only - Sep 5 0:00 0 S 3482742SwollmanRule StJohns 1944 only - Jul 10 0:00 1:00 D 3492742SwollmanRule StJohns 1944 only - Sep 2 0:00 0 S 3502742SwollmanRule StJohns 1945 only - Jan 1 0:00 1:00 D 3512742SwollmanRule StJohns 1945 only - Oct 7 2:00 0 S 3522742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 3532742Swollman# Apr 30 - Sep 24; go with Shanks. 3542742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 3552742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 3562742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 3572742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 3582742SwollmanRule StJohns 1960 max - Oct lastSun 2:00 0 S 3592742SwollmanRule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 3602742SwollmanRule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D 3612742SwollmanRule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 3622742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 3632742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3642742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 3652742Swollman -3:31 StJohns N%sT 1935 Mar 30 3662742Swollman -3:30 StJohns N%sT 3672742Swollman 3688029Swollman# ZONE-DESCR America St_Johns Canada Newfoundland 3698029Swollman 3702742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3712742SwollmanRule Halifax 1902 only - Jun 15 0:00 0 S 3722742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 3732742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 3742742SwollmanRule Halifax 1918 only - Apr 14 2:00 1:00 D 3752742SwollmanRule Halifax 1918 only - Oct 31 2:00 0 S 3762742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 3772742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 3782742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 3792742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 3802742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 3812742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 3822742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 3832742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 3842742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 3852742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 3862742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 3872742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 3882742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 3892742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 3902742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 3912742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 3922742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 3932742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 3942742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 3952742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 3962742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 3972742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 3982742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 3992742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 4002742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 4012742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 4022742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 4032742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 4042742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 4052742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 4062742SwollmanRule Halifax 1942 only - Feb 9 2:00 1:00 D 4072742SwollmanRule Halifax 1945 1959 - Sep lastSun 2:00 0 S 4082742SwollmanRule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 4092742SwollmanRule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 4102742SwollmanRule Halifax 1962 max - Oct lastSun 2:00 0 S 4112742SwollmanRule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 4122742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4132742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 4142742Swollman -4:00 Halifax A%sT 4152742Swollman 4168029Swollman# ZONE-DESCR America Halifax Canada Atlantic time 4178029Swollman 4182742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 4192742SwollmanRule Mont 1884 only - Jan 1 0:00 0 S 4202742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 4212742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 4222742SwollmanRule Mont 1918 only - Apr 14 2:00 1:00 D 4232742SwollmanRule Mont 1918 only - Oct 31 2:00 0 S 4242742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 4252742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 4262742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 4272742SwollmanRule Mont 1920 only - Oct 3 2:30 0 S 4282742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 4292742SwollmanRule Mont 1921 only - Oct 2 2:30 0 S 4302742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 4312742SwollmanRule Mont 1922 only - Oct 1 2:30 0 S 4322742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 4332742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 4342742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 4352742SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 4362742SwollmanRule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 4372742SwollmanRule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 4382742SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 4392742SwollmanRule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 4402742SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 4412742SwollmanRule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 4422742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 4432742SwollmanRule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 4442742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 4452742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 4462742SwollmanRule Mont 1957 max - Oct lastSun 2:00 0 S 4472742SwollmanRule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 4482742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4492742SwollmanZone America/Montreal -4:54:16 - LMT 1884 4502742Swollman -5:00 Mont E%sT 4512742Swollman 4528029Swollman# ZONE-DESCR America Montreal Canada Eastern time 4538029Swollman 4542742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 4552742SwollmanRule Winn 1887 only - Jul 16 0:00 0 S 4562742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 4572742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 4582742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 4592742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 4602742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 4612742SwollmanRule Winn 1937 only - Sep 23 2:00 0 S 4622742SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 D 4632742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 4642742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 4652742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 4662742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 4672742SwollmanRule Winn 1947 1958 - Sep lastSun 2:00 0 S 4682742SwollmanRule Winn 1948 only - May 1 2:00 1:00 D 4692742SwollmanRule Winn 1948 1960 - Apr lastSun 2:00 1:00 D 4702742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 4712742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 4722742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 4732742SwollmanRule Winn 1963 only - Sep lastSun 2:00 0 S 4742742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 4752742SwollmanRule Winn 1966 max - Sep lastSun 2:00 0 S 4762742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 4772742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4782742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 4792742Swollman -6:00 Winn C%sT 4802742Swollman 4818029Swollman# ZONE-DESCR America Winnipeg Canada Manitoba 4828029Swollman 4832742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 4842742SwollmanRule Regina 1905 only - Sep 1 0:00 0 S 4852742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 4862742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 4872742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 4882742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 4892742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 4902742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 4912742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 4922742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 4932742SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 D 4942742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 4952742SwollmanRule Regina 1946 only - Apr 14 2:00 1:00 D 4962742SwollmanRule Regina 1946 only - Oct 13 2:00 0 S 4972742SwollmanRule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 4982742SwollmanRule Regina 1947 1959 - Sep lastSun 2:00 0 S 4992742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5002742SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 5012742Swollman -7:00 Regina M%sT 1966 Apr 15 5022742Swollman -6:00 - CST 5032742Swollman 5048029Swollman# ZONE-DESCR America Regina Canada Saskatchewan 5058029Swollman 5062742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5072742SwollmanRule Edm 1906 only - Sep 1 0:00 0 S 5082742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 5092742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 5102742SwollmanRule Edm 1919 only - May 27 2:00 0 S 5112742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 5122742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 5132742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 5142742SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 D 5152742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 5162742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 5172742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 5182742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 5192742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 5202742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 5212742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 5222742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 5232742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 5242742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 5252742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5262742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 5272742Swollman -7:00 Edm M%sT 5282742Swollman 5298029Swollman# ZONE-DESCR America Edmonton Canada Alberta 5308029Swollman 5312742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5322742SwollmanRule Vanc 1884 only - Jan 1 0:00 0 S 5332742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 5342742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 5352742SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 D 5362742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 5372742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 5382742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 5392742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 5402742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 5412742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 5422742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5432742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 5442742Swollman -8:00 Vanc P%sT 5452742Swollman 5468029Swollman# ZONE-DESCR America Vancouver Canada British Columbia 5478029Swollman 5482742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5492742SwollmanRule Yukon 1900 only - Jan 1 0:00 0 S 5502742SwollmanRule Yukon 1918 only - Apr 14 2:00 1:00 D 5512742SwollmanRule Yukon 1918 only - Oct 27 2:00 0 S 5522742SwollmanRule Yukon 1919 only - May 25 2:00 1:00 D 5532742SwollmanRule Yukon 1919 only - Nov 1 0:00 0 S 5542742SwollmanRule Yukon 1942 only - Feb 9 2:00 1:00 D 5552742SwollmanRule Yukon 1965 only - Apr 25 0:00 1:00 D 5562742SwollmanRule Yukon 1965 only - Oct 31 2:00 0 S 5572742SwollmanRule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 5582742SwollmanRule Yukon 1980 max - Oct lastSun 2:00 0 S 5592742SwollmanRule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 5602742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5612742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 5622742Swollman -9:00 Yukon Y%sT 1966 Jul 5632742Swollman -8:00 Yukon P%sT 5642742Swollman# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 5652742Swollman 5668029Swollman# ZONE-DESCR America Whitehorse Canada Yukon Territory 5678029Swollman 5682742Swollman############################################################################### 5692742Swollman 5702742Swollman# Mexico 5712742Swollman 5722742Swollman# From Guy Harris: 5732742Swollman# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 5742742Swollman# Rules prior to 1987 are unknown. 5752742Swollman# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 5762742Swollman# observe DST." This is presumably Baja California Norte, above 28th parallel, 5772742Swollman# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific 5782742Swollman# Coast (States of Sinaloa and Sonora)." 5792742Swollman 5802742Swollman# From Bob Devine (January 28, 1988): 5812742Swollman# The Federal District (where Mexico City is) has observed [DST] several 5822742Swollman# times but not recently. 5832742Swollman# 5842742Swollman# I don't where to drawn the line in the North Baja area. 28th latitude 5852742Swollman# sounds good -- but it may be higher (how far [d]o radio stations from 5862742Swollman# San Diego affect culture?). 5872742Swollman# 5882742Swollman# The dates of DST probably go back to 1981. The rules are the same as 5892742Swollman# US's. This is going to be a headache for US presidential electi[o]n years! 5902742Swollman 5912742Swollman# From Arthur David Olson (February 13, 1988) 5922742Swollman# Since the 1981 starting date is only "probable," we'll keep the 1987 5932742Swollman# starting date below. 5942742Swollman 5952742Swollman# From U. S. Naval Observatory (January 19, 1989): 5962742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 5972742Swollman# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 5982742Swollman# MEXICO BAJA CAL N OF SINALOA AND SONORA) 5992742Swollman# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 6002742Swollman# MEXICO BAJA CAL N - OCT 29 6012742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 6022742Swollman# MEXICO BAJA CAL N - 0CT 29 6032742Swollman# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 6042742Swollman# MEXICO COAHUILA, NUEVO LEON, 6052742Swollman# MEXICO TAMAULIPAS 6062742Swollman# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 6072742Swollman# MEXICO COAHUILA, NUEVO LEON, 6082742Swollman# MEXICO TAMAULIPAS APR 3 - OCT 29 6092742Swollman# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 6102742Swollman# MEXICO CAMPECHE, QUINTANA ROO AND 6112742Swollman# MEXICO YUCATAN 6122742Swollman 6132742Swollman# From Arthur David Olson (January 21, 1989): 6142742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 6152742Swollman# USNO claims there should be four Mexican zones rather than three: 6162742Swollman# a zone that's GMT-8 with DST; a zone that's always GMT-7; 6172742Swollman# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 6182742Swollman 6192742Swollman# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 6202742Swollman# Shanks also says there are four zones, but disagrees about the fourth. 6212742Swollman# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 6222742Swollman 6232742Swollman# From Shanks (1991): 6242742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6252742SwollmanRule Mexico 1922 only - Jan 1 0:00 0 S 6262742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 6272742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 6282742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 6292742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 6302742SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 D 6312742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 6322742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 6332742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 6342742SwollmanRule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 6352742SwollmanRule BajaN 1950 1961 - Sep lastSun 2:00 0 S 6362742SwollmanRule BajaN 1961 1966 - Oct lastSun 2:00 0 S 6372742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6382742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 6392742Swollman -7:00 - MST 1927 Jun 10 23:00 6402742Swollman -6:00 - CST 1930 Nov 15 6412742Swollman -7:00 - MST 1931 May 1 23:00 6422742Swollman -6:00 - CST 1931 Oct 6432742Swollman -7:00 - MST 1932 Mar 30 23:00 6442742Swollman -6:00 Mexico C%sT 6458029Swollman# ZONE-DESCR America Mexico_City Mexico Mexico City 6462742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 6472742Swollman -7:00 - MST 1927 Jun 10 23:00 6482742Swollman -6:00 - CST 1930 Nov 15 6492742Swollman -7:00 - MST 1931 May 1 23:00 6502742Swollman -6:00 - CST 1931 Oct 6512742Swollman -7:00 - MST 1932 Mar 30 23:00 6522742Swollman -6:00 - CST 1942 Apr 6532742Swollman -7:00 - MST 1949 Jan 14 6542742Swollman -8:00 - PST 1970 6552742Swollman -7:00 - MST 6568029Swollman# ZONE-DESCR America Mazatlan Mexico Mazatlan 6572742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 6582742Swollman -8:00 - PST 1927 Jun 10 23:00 6592742Swollman -7:00 - MST 1930 Nov 16 6602742Swollman -8:00 - PST 1942 Apr 6612742Swollman -7:00 - MST 1949 Jan 14 6622742Swollman -8:00 BajaN P%sT 1967 Apr lastSun 2:00 6632742Swollman -8:00 US P%sT 6648029Swollman# ZONE-DESCR America Tijuana Mexico Baja California Norte 6652742SwollmanZone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 6662742Swollman -8:00 - PST 1927 Jun 10 23:00 6672742Swollman -7:00 - MST 1930 Nov 16 6682742Swollman -8:00 - PST 1942 Apr 6692742Swollman -7:00 - MST 1949 Jan 14 6702742Swollman -8:00 - PST 6718029Swollman# ZONE-DESCR America Ensenada Mexico Ensenada 6728029Swollman 6732742Swollman# 6742742Swollman# Revillagigedo Is 6752742Swollman# no information 6762742Swollman 6772742Swollman############################################################################### 6782742Swollman 6792742Swollman# Anguilla 6802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6812742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 6822742Swollman -4:00 - AST 6832742Swollman 6848029Swollman# ZONE-DESCR America Anguilla Anguilla All points 6858029Swollman 6862742Swollman# Antigua and Barbuda 6872742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6882742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 6892742Swollman -5:00 - EST 1951 6902742Swollman -4:00 - AST 6912742Swollman 6928029Swollman# ZONE-DESCR America Antigua Antigua All points 6938029Swollman 6942742Swollman# Bahamas 6952742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6962742SwollmanRule Bahamas 1912 only - Mar 2 0:00 0 S 6972742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 6982742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 6992742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 7002742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7012742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 7022742Swollman -5:00 Bahamas E%sT 7032742Swollman 7048029Swollman# ZONE-DESCR America Nassau Bahamas All points 7058029Swollman 7062742Swollman# Barbados 7072742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7082742SwollmanRule Barb 1932 only - Jan 1 0:00 0 S 7092742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 7102742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 7112742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 7122742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 7132742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 7142742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7152742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 7162742Swollman -3:58 - BMT 1932 # Bridgetown Mean Time 7172742Swollman -4:00 Barb A%sT 7182742Swollman 7198029Swollman# ZONE-DESCR America Barbados Barbados All points 7208029Swollman 7212742Swollman# Belize 7222742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 7232742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7242742SwollmanRule Belize 1912 only - Apr 1 0:00 0 S 7252742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 7262742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 7272742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 7282742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 7292742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 7302742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 7312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7322742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 7332742Swollman -6:00 Belize C%sT 7342742Swollman 7358029Swollman# ZONE-DESCR America Belize Belize All points 7368029Swollman 7372742Swollman# Bermuda 7382742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7392742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 7402742Swollman -4:00 - AST 1974 Apr 28 2:00 7412742Swollman -4:00 Bahamas A%sT 7422742Swollman 7438029Swollman# ZONE-DESCR Atlantic Bermuda Bermuda All points 7448029Swollman 7452742Swollman# Cayman Is 7462742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7472742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 7482742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 7492742Swollman -5:00 - EST 7502742Swollman 7518029Swollman# ZONE-DESCR America Cayman Cayman_Islands All points 7528029Swollman 7532742Swollman# Clipperton 7542742Swollman# no information 7552742Swollman 7562742Swollman# Costa Rica 7572742Swollman# Shanks gives some very odd dates for 1991, and stops there. 7582742Swollman# For now, we won't guess further. 7592742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7602742SwollmanRule CR 1921 only - Jan 15 0:00 0 S 7612742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 7622742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 7632742SwollmanRule CR 1991 only - Jan 19 0:00 1:00 D 7642742SwollmanRule CR 1991 only - Jul 1 0:00 0 S 7652742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 7662742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7672742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 7682742Swollman -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 7692742Swollman -6:00 CR C%sT 7708029Swollman# ZONE-DESCR America Costa_Rica Costa_Rica All points 7718029Swollman 7722742Swollman# Coco 7732742Swollman# no information; probably like America/Costa_Rica 7742742Swollman 7752742Swollman# Cuba 7762742Swollman 7772742Swollman# From Bob Devine (January 28, 1988): 7782742Swollman# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 7792742Swollman# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 7802742Swollman# (I think). 7812742Swollman 7822742Swollman# From U. S. Naval Observatory (January 19, 1989): 7832742Swollman# CUBA 5 H BEHIND UTC 7842742Swollman# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 7852742Swollman 7862742Swollman# From Shanks (1991): 7872742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7882742SwollmanRule Cuba 1925 only - Jul 19 12:00 0 S 7892742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 7902742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 7912742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 7922742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 7932742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 7942742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 7952742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 7962742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 7972742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 7982742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 7992742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 8002742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 8012742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 8022742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 8032742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 8042742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 8052742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 8062742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 8072742SwollmanRule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 8082742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 8092742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 8102742SwollmanRule Cuba 1981 max - Oct Sun>=8 0:00 0 S 8112742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 8122742SwollmanRule Cuba 1990 only - Apr 1 0:00 1:00 D 8132742SwollmanRule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 8142742Swollman 8152742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8162742SwollmanZone America/Havana -5:29:28 - LMT 1890 8172742Swollman -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 8182742Swollman -5:00 Cuba C%sT 8192742Swollman 8208029Swollman# ZONE-DESCR America Havana Cuba All points 8218029Swollman 8222742Swollman# Dominica 8232742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8242742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 8252742Swollman -4:00 - AST 8262742Swollman 8278029Swollman# ZONE-DESCR America Dominica Dominica All points 8288029Swollman 8292742Swollman# Dominican Republic 8302742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8312742SwollmanRule DR 1933 only - Apr 1 12:00 0 S 8322742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 8332742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 8342742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 8352742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 8362742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 8372742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 8382742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8392742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 8402742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 8412742Swollman -5:00 DR E%sT 1974 Oct 27 8422742Swollman -4:00 - AST 8432742Swollman 8448029Swollman# ZONE-DESCR America Santo_Domingo Dominican_Republic All points 8458029Swollman 8462742Swollman# El Salvador 8472742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8482742SwollmanRule Salv 1921 only - Jan 1 0:00 0 S 8492742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 8502742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 8512742Swollman# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 8522742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8532742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 8542742Swollman -6:00 Salv C%sT 8552742Swollman 8568029Swollman# ZONE-DESCR America El_Salvador El_Salvador All points 8578029Swollman 8582742Swollman# Grenada 8592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8602742SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul 8612742Swollman -4:00 - AST 8622742Swollman 8638029Swollman# ZONE-DESCR America Grenada Grenada All points 8648029Swollman 8652742Swollman# Guadeloupe 8662742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8672742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 8682742Swollman -4:00 - AST 8692742Swollman 8708029Swollman# ZONE-DESCR America Guadeloupe Guadeloupe All points 8718029Swollman 8722742Swollman# Guatemala 8732742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8742742SwollmanRule Guat 1918 only - Oct 5 0:00 0 S 8752742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 8762742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 8772742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 8782742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 8792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8802742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 8812742Swollman -6:00 Guat C%sT 8822742Swollman 8838029Swollman# ZONE-DESCR America Guatemala Guatemala All points 8848029Swollman 8852742Swollman# Haiti 8862742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8872742SwollmanRule Haiti 1917 only - Jan 24 12:00 0 S 8882742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 8892742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 8902742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 8912742SwollmanRule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 8922742SwollmanRule Haiti 1988 max - Oct lastSun 2:00 0 S 8932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8942742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 8952742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 8962742Swollman -5:00 Haiti E%sT 8972742Swollman 8988029Swollman# ZONE-DESCR America Port-au-Prince Haiti All points 8998029Swollman 9002742Swollman# Honduras 9012742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 9022742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9032742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 9042742Swollman -6:00 Salv C%sT 9052742Swollman 9068029Swollman# ZONE-DESCR America Tegucigalpa Honduras All points 9078029Swollman 9082742Swollman# Jamaica 9092742Swollman 9102742Swollman# From Bob Devine (January 28, 1988): 9112742Swollman# Follows US rules. 9122742Swollman 9132742Swollman# From U. S. Naval Observatory (January 19, 1989): 9142742Swollman# JAMAICA 5 H BEHIND UTC 9152742Swollman 9162742Swollman# From Shanks (1991): 9172742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9182742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 9192742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 9202742Swollman -5:00 - EST 1974 Jan 6 2:00 9212742Swollman -5:00 US E%sT 9222742Swollman 9238029Swollman# ZONE-DESCR America Jamaica Jamaica All points 9248029Swollman 9252742Swollman# Martinique 9262742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9272742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 9282742Swollman -4:04 - FFMT 1911 May # Fort-de-France MT 9292742Swollman -4:00 - AST 1980 Apr 6 9302742Swollman -4:00 1:00 ADT 1980 Sep 28 9312742Swollman -4:00 - AST 9322742Swollman 9338029Swollman# ZONE-DESCR America Martinique Martinique All points 9348029Swollman 9352742Swollman# Montserrat 9362742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9372742SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 9382742Swollman -4:00 - AST 9392742Swollman 9408029Swollman# ZONE-DESCR America Montserrat Montserrat All points 9418029Swollman 9422742Swollman# Nicaragua 9432742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 9442742SwollmanRule Nic 1975 only - Feb 16 0:00 0 S 9452742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 9462742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 9472742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9482742SwollmanZone America/Managua -5:45:08 - LMT 1890 9492742Swollman -5:45 - MMT 1934 Jun 23 # Managua Mean Time 9502742Swollman -6:00 - CST 1973 May 9512742Swollman -5:00 - EST 1975 Feb 16 9522742Swollman -6:00 Nic C%sT 9532742Swollman 9548029Swollman# ZONE-DESCR America Managua Nicaragua All points 9558029Swollman 9562742Swollman# Panama 9572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9582742SwollmanZone America/Panama -5:18:08 - LMT 1890 9592742Swollman -5:20 - PMT 1908 Apr 22 # Panama Mean Time 9602742Swollman -5:00 - EST 9612742Swollman 9628029Swollman# ZONE-DESCR America Panama Panama All points 9638029Swollman 9642742Swollman# Puerto Rico 9652742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 9662742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9672742SwollmanZone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan 9682742Swollman -4:00 - AST 1942 May 3 9692742Swollman -4:00 1:00 ADT 1945 Sep 30 2:00 9702742Swollman -4:00 - AST 9712742Swollman 9728029Swollman# ZONE-DESCR America Puerto_Rico United_States Puerto Rico 9738029Swollman 9742742Swollman# St Kitts-Nevis 9752742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9762742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 9772742Swollman -4:00 - AST 9782742Swollman 9798029Swollman# ZONE-DESCR America St_Kitts St_Kitts_and_Nevis All points 9808029Swollman 9812742Swollman# St Lucia 9822742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9832742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 9842742Swollman -4:04 - CMT 1912 # Castries Mean Time 9852742Swollman -4:00 - AST 9862742Swollman 9878029Swollman# ZONE-DESCR America St_Lucia St_Lucia All points 9888029Swollman 9892742Swollman# St Pierre and Miquelon 9902742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 9912742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9922742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 9932742Swollman -4:00 - AST 1980 May 9942742Swollman -3:00 Mont SP%sT 9952742Swollman 9968029Swollman# ZONE-DESCR America Miquelon France St. Pierre and Miquelon 9978029Swollman 9982742Swollman# St Vincent and the Grenadines 9992742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10002742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 10012742Swollman -4:05 - KMT 1912 # Kingstown Mean Time 10022742Swollman -4:00 - AST 10032742Swollman 10048029Swollman# ZONE-DESCR America St_Vincent St_Vincent All points 10058029Swollman 10062742Swollman# Turks and Caicos 10072742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10082742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 10092742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 10102742Swollman -5:00 - EST 1979 Apr 29 2:00 10112742Swollman -5:00 US E%sT 10122742Swollman 10138029Swollman# ZONE-DESCR America Grand_Turk Turks_and_Caicos All points 10148029Swollman 10152742Swollman# Virgin Is (British and US) 10162742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10172742SwollmanZone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie 10182742Swollman -4:00 - AST 10198029Swollman 10208029Swollman# ZONE-DESCR America Virgin United_States US Virgin Islands 10218029Swollman# ZONE-DESCR America virgin United_Kingdom British Virgin Islands 1022