1# @(#)northamerica 7.28 |
2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 |
8# From Paul Eggert <eggert@twinsun.com> (1994-08-17): |
9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and the discovery of the longitude, 11# Oxford University Press (1980). 12 13############################################################################### 14 15# United States 16 --- 19 unchanged lines hidden (view full) --- 36# scheme I detect the bony, blue-fingered hand of Puritanism, eager 37# to push people into bed earlier, and get them up earlier, to make 38# them healthy, wealthy and wise in spite of themselves. 39# 40# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 41 42# From Arthur David Olson: 43# US Daylight Saving Time ended on the last Sunday of *October* in 1974. |
44# See, for example, the front page of the Saturday, 1974-10-26 45# and Sunday, 1974-10-27 editions of the Washington Post. |
46 47# From Arthur David Olson: 48# Before the Uniform Time Act of 1966 took effect in 1967, observance of 49# Daylight Saving Time in the US was by local option, except during wartime. 50 51# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 52Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 53Rule US 1918 1919 - Oct lastSun 2:00 0 S 54Rule US 1942 only - Feb 9 2:00 1:00 W # War 55Rule US 1945 only - Sep 30 2:00 0 S 56Rule US 1967 max - Oct lastSun 2:00 0 S 57Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 58Rule US 1974 only - Jan 6 2:00 1:00 D 59Rule US 1975 only - Feb 23 2:00 1:00 D 60Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 61Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 62 |
63# From Bob Devine (1988-01-28): |
64# ...Alaska (and Hawaii) had the timezone names changed in 1967. 65# old new 66# Pacific Standard Time(PST) -same- 67# Yukon Standard Time(YST) -same- 68# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 69# Nome Standard Time (NT) Bering Standard Time (BST) 70# 71# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 72# The YST zone now covers nearly all of the state, AHST just part 73# of the Aleutian islands. No DST. 74 75# From Paul Eggert (1995-12-19): 76# The tables below use `NST', not `NT', for Nome Standard Time. 77# I invented `CAWT' for Central Alaska War Time. 78 |
79# From U. S. Naval Observatory (1989-01-19): |
80# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 81# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 82# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 83# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 84# USA MOUNTAIN 7 H BEHIND UTC DENVER 85# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 86# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 87# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 88# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 89# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 90# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 91# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 92# USA HAWAII 10 H BEHIND UTC 93# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 94 |
95# From Arthur David Olson (1989-01-21): |
96# The above dates are for 1988. 97# Note the "AKST" and "AKDT" abbreviations, the claim that there's 98# no DST in Samoa, and the claim that there is DST in Alaska and the 99# Aleutians. 100 |
101# From Arthur David Olson (1988-02-13): |
102# Legal standard time zone names, from United States Code (1982 Edition and 103# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names |
104# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 |
105# took effect), as explained in sections 263 and 261: 106# (none) 107# United States standard eastern time 108# United States standard mountain time 109# United States standard central time 110# United States standard Pacific time 111# (none) 112# United States standard Alaska time 113# (none) |
114# Next, names from 1967-04-01 until 1983-11-30 (the date for |
115# public law 98-181): 116# Atlantic standard time 117# eastern standard time 118# central standard time 119# mountain standard time 120# Pacific standard time 121# Yukon standard time 122# Alaska-Hawaii standard time 123# Bering standard time |
124# And after 1983-11-30: |
125# Atlantic standard time 126# eastern standard time 127# central standard time 128# mountain standard time 129# Pacific standard time 130# Alaska standard time 131# Hawaii-Aleutian standard time 132# Samoa standard time --- 12 unchanged lines hidden (view full) --- 145Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 146# Zone NAME GMTOFF RULES FORMAT [UNTIL] 147Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 148 -5:00 US E%sT 1920 149 -5:00 NYC E%sT 1942 150 -5:00 US E%sT 1946 151 -5:00 NYC E%sT 1967 152 -5:00 US E%sT |
153 154# US Central time, represented by Chicago 155# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 156Rule Chicago 1920 only - Jun 13 2:00 1:00 D 157Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 158Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 159Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 160Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 161Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 162# Zone NAME GMTOFF RULES FORMAT [UNTIL] 163Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 164 -6:00 US C%sT 1920 165 -6:00 Chicago C%sT 1936 Mar 1 2:00 166 -5:00 - EST 1936 Nov 15 2:00 167 -6:00 Chicago C%sT 1942 168 -6:00 US C%sT 1946 169 -6:00 Chicago C%sT 1967 170 -6:00 US C%sT |
171 172# US Mountain time, represented by Denver 173# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 174Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 175Rule Denver 1920 only - Oct lastSun 2:00 0 S 176Rule Denver 1921 only - May 22 2:00 0 S 177Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 178Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 179# Zone NAME GMTOFF RULES FORMAT [UNTIL] 180Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 181 -7:00 US M%sT 1920 182 -7:00 Denver M%sT 1942 183 -7:00 US M%sT 1946 184 -7:00 Denver M%sT 1967 185 -7:00 US M%sT |
186 187# US Pacific time, represented by Los Angeles 188# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 189Rule CA 1948 only - Mar 14 2:00 1:00 D 190Rule CA 1949 only - Jan 1 2:00 0 S 191Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 192Rule CA 1950 1961 - Sep lastSun 2:00 0 S 193Rule CA 1962 1966 - Oct lastSun 2:00 0 S 194# Zone NAME GMTOFF RULES FORMAT [UNTIL] 195Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 196 -8:00 US P%sT 1946 197 -8:00 CA P%sT 1967 198 -8:00 US P%sT |
199 200# Alaska 201# AK%sT is the modern abbreviation for -9:00 per USNO. 202# 203# From Paul Eggert (1995-12-19): 204# Howse writes that Alaska switched from the Julian to the Gregorian calendar, |
205# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 206# This was on 1867-10-18. We omit this transition, since we can't represent 207# changes from Julian to Gregorian. |
208# 209# Zone NAME GMTOFF RULES FORMAT [UNTIL] 210Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 211 -8:00 - PST 1942 212 -8:00 US P%sT 1946 213 -8:00 - PST 1969 214 -8:00 US P%sT 1983 Oct 30 2:00 215 -9:00 US AK%sT --- 24 unchanged lines hidden (view full) --- 240 -11:00 - BST 1969 241 -11:00 US B%sT 1983 Oct 30 2:00 242 -10:00 US HA%sT 243# Shanks writes that part of southwest Alaska (e.g. Aniak) 244# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 245# and another part (e.g. Akiak) made the same switch five weeks later. 246# These switches don't quite make our 1970 cutoff. 247 |
248# Hawaii 249# 250# From Arthur David Olson: 251# And then there's Hawaii. 252# DST was observed for one day in 1933; 253# standard time was changed by half an hour in 1947; 254# it's always standard as of 1986. 255# --- 6 unchanged lines hidden (view full) --- 262 -10:30 US H%sT 1947 Jun 8 2:00 263 -10:00 - HST 264 265Zone Pacific/Midway -11:49:28 - LMT 1901 266 -11:00 - NST 1967 Apr # N=Nome 267 -11:00 - BST 1983 Nov 30 # B=Bering 268 -11:00 - SST # S=Samoa 269 |
270# Now we turn to US areas that have diverged from the consensus since 1970. 271 272# Arizona mostly uses MST. 273Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 274 -7:00 US M%sT 1944 Jan 1 00:01 275 -7:00 - MST 1944 Mar 17 00:01 276 -7:00 US M%sT 1944 Oct 1 00:01 277 -7:00 - MST 1967 278 -7:00 US M%sT 1968 279 -7:00 - MST |
280# From Arthur David Olson (1988-02-13): |
281# A writer from the Inter Tribal Council of Arizona, Inc., 282# notes in private correspondence dated 12/28/87 that "Presently, only the 283# Navajo Nation participates in the Daylight Saving Time policy, due to its 284# large size and location in three states." (The "only" means that other 285# tribal nations don't use DST.) 286 287Link America/Denver America/Shiprock 288 289# Southern Idaho and eastern Oregon switched four weeks late in 1974. 290# Zone NAME GMTOFF RULES FORMAT [UNTIL] 291Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 292 -8:00 US P%sT 1923 May 13 2:00 293 -7:00 US M%sT 1974 294 -7:00 - MST 1974 Feb 3 2:00 295 -7:00 US M%sT 296 |
297# Indiana 298# 299# From Paul Eggert (1995-12-19): 300# Indiana generally observes either EST all year, or CST/CDT, 301# but areas near Cincinnati and Louisville use those cities' timekeeping 302# and in 1969 and 1970 the whole state observed daylight time; 303# and there are other exceptions as noted below. 304# Shanks partitions Indiana into 345 regions, each with its own time history, --- 21 unchanged lines hidden (view full) --- 326 -6:00 US C%sT 1946 327 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 328 -5:00 - EST 1957 Sep 29 2:00 329 -6:00 - CST 1958 Apr 27 2:00 330 -5:00 - EST 1969 331 -5:00 US E%sT 1971 332 -5:00 - EST 333Link America/Indianapolis America/Indiana/Indianapolis |
334# 335# Part of Crawford County, Indiana, last observed DST in 1975, 336# and left its clocks alone in 1974. 337# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 338Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 339Rule Marengo 1951 only - Sep lastSun 2:00 0 S 340Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 341Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 342# Zone NAME GMTOFF RULES FORMAT [UNTIL] 343Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 344 -6:00 US C%sT 1951 345 -6:00 Marengo C%sT 1961 Apr 30 2:00 346 -5:00 - EST 1969 347 -5:00 US E%sT 1974 Jan 6 2:00 348 -6:00 1:00 CDT 1974 Oct 27 2:00 349 -5:00 US E%sT 1976 350 -5:00 - EST |
351# 352# Starke County, Indiana |
353# From Arthur David Olson (1991-10-28): 354# An article on page A3 of the Sunday, 1991-10-27 Washington Post |
355# notes that Starke County switched from Central time to Eastern time as of |
356# 1991-10-27. |
357# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 358Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 359Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 360Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 361Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 362Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 363# Zone NAME GMTOFF RULES FORMAT [UNTIL] 364Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 365 -6:00 US C%sT 1947 366 -6:00 Starke C%sT 1962 Apr 29 2:00 367 -5:00 - EST 1963 Oct 27 2:00 368 -6:00 US C%sT 1991 Oct 27 2:00 369 -5:00 - EST |
370# 371# Switzerland County, Indiana, last observed DST in 1972. 372# Zone NAME GMTOFF RULES FORMAT [UNTIL] 373Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 374 -6:00 US C%sT 1954 Apr 25 2:00 375 -5:00 - EST 1969 376 -5:00 US E%sT 1973 377 -5:00 - EST 378 |
379# Part of Kentucky left its clocks alone in 1974. 380# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 381Rule Louisville 1921 only - May 1 2:00 1:00 D 382Rule Louisville 1921 only - Sep 1 2:00 0 S 383Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 384Rule Louisville 1941 only - Sep lastSun 2:00 0 S 385Rule Louisville 1946 only - Jun 2 2:00 0 S 386Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S --- 4 unchanged lines hidden (view full) --- 391 -6:00 Louisville C%sT 1942 392 -6:00 US C%sT 1946 393 -6:00 Louisville C%sT 1961 Jul 23 2:00 394 -5:00 - EST 1968 395 -5:00 US E%sT 1974 Jan 6 2:00 396 -6:00 1:00 CDT 1974 Oct 27 2:00 397 -5:00 US E%sT 398 |
399# Michigan 400# |
401# From Bob Devine (1988-01-28): |
402# Michigan didn't observe DST from 1968 to 1973. 403# 404# From Paul Eggert (1995-12-19): 405# Shanks writes that Michigan started using standard time on 1885 Sep 18, 406# but Howse (p 126) writes that Detroit kept 407# 408# local time until 1900 when the City Council decreed that clocks should 409# be put back twenty-eight minutes to Central Standard Time. Half the --- 15 unchanged lines hidden (view full) --- 425Zone America/Detroit -5:32:11 - LMT 1905 426 -6:00 - CST 1915 May 15 2:00 427 -5:00 - EST 1942 428 -5:00 US E%sT 1946 429 -5:00 Detroit E%sT 1973 430 -5:00 US E%sT 1975 431 -5:00 - EST 1975 Apr 27 2:00 432 -5:00 US E%sT |
433# 434# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 435# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 436Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 437Rule Menominee 1946 only - Sep lastSun 2:00 0 S 438Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 439Rule Menominee 1966 only - Oct lastSun 2:00 0 S 440# Zone NAME GMTOFF RULES FORMAT [UNTIL] 441Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 442 -6:00 US C%sT 1946 443 -6:00 Menominee C%sT 1969 Apr 27 2:00 444 -5:00 - EST 1973 Apr 29 2:00 445 -6:00 US C%sT 446 |
447# Navassa 448# uninhabited 449 |
450 |
451# Old names, for S5 users 452 453# Link LINK-FROM LINK-TO 454Link America/New_York EST5EDT 455Link America/Chicago CST6CDT 456Link America/Denver MST7MDT 457Link America/Los_Angeles PST8PDT 458Link America/Indianapolis EST 459Link America/Phoenix MST 460Link Pacific/Honolulu HST 461 |
462################################################################################ 463 464 |
465# From Paul Eggert <eggert@twinsun.com> (1993-11-18): |
466# A good source for time zone historical data outside the US is 467# Thomas G. Shanks, The International Atlas (3rd edition), 468# San Diego: ACS Publications, Inc. (1991). 469# Except where otherwise noted, it is the source for the data below. 470# 471# Another source occasionally used is Edward W. Whitman, World Time Differences, 472# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 473# I found in the UCLA library. 474# |
475# See the `europe' file for Greenland. 476# |
477# See the `africa' file for time zone naming and abbreviation conventions. |
478 479# Canada 480 481# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 482# I post here the time zone abbreviations standardized in Canada 483# for both English and French in the CAN/CSA-Z234.4-89 standard.... 484# 485# UTC Standard time Daylight savings time --- 72 unchanged lines hidden (view full) --- 558Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 559Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 560# St John's has an apostrophe, but Posix file names can't have apostrophes. 561# Zone NAME GMTOFF RULES FORMAT [UNTIL] 562Zone America/St_Johns -3:30:52 - LMT 1884 563 -3:31 StJohns N%sT 1935 Mar 30 564 -3:30 StJohns N%sT 565 |
566 567# Labrador, New Brunswick, Nova Scotia, Prince Edward I 568 569# From Paul Eggert (1996-06-12): 570# Shanks writes that since 1970 most of this region has been like Halifax. 571# Many locales did not observe peacetime DST until 1972; 572# Glace Bay, NS is the largest that we know of. 573# Shanks also writes that Liverpool, NS was the only town in Canada to observe --- 44 unchanged lines hidden (view full) --- 618Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 619 -4:00 Halifax A%sT 620Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 621 -4:00 Canada A%sT 1953 622 -4:00 Halifax A%sT 1954 623 -4:00 - AST 1972 624 -4:00 Halifax A%sT 625 |
626 627# Ontario, Quebec 628 629# From Paul Eggert (1996-06-12): 630# Shanks writes that since 1970 most of this region has been like Montreal. 631# Thunder Bay skipped DST in 1973. 632# Many smaller locales did not observe peacetime DST until 1974; 633# Nipigon (EST) and Rainy River (CST) are the largest that we know of. --- 36 unchanged lines hidden (view full) --- 670 -5:00 Mont E%sT 1973 671 -5:00 - EST 1974 672 -5:00 Canada E%sT 673Zone America/Nipigon -5:53:04 - LMT 1895 674 -5:00 Canada E%sT 675Zone America/Rainy_River -6:17:56 - LMT 1895 676 -6:00 Canada C%sT 677 |
678 679# Manitoba |
680 |
681# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 682Rule Winn 1916 only - Apr 23 0:00 1:00 D 683Rule Winn 1916 only - Sep 17 0:00 0 S 684Rule Winn 1918 only - Apr 14 2:00 1:00 D 685Rule Winn 1918 only - Oct 31 2:00 0 S 686Rule Winn 1937 only - May 16 2:00 1:00 D 687Rule Winn 1937 only - Sep 26 2:00 0 S 688Rule Winn 1942 only - Feb 9 2:00 1:00 D --- 12 unchanged lines hidden (view full) --- 701Rule Winn 1963 only - Sep 22 2:00 0 S 702Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 703Rule Winn 1966 max - Oct lastSun 2:00 0 S 704Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 705# Zone NAME GMTOFF RULES FORMAT [UNTIL] 706Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 707 -6:00 Winn C%sT 708 |
709 710# Saskatchewan 711 712# From Paul Eggert (1996-06-12): 713# Shanks writes that since 1970 most of this region has been like Regina. 714# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 715# Other western towns (e.g. Lloydminster) are like Edmonton. 716 |
717# From W. Jones <jones@skdad.usask.ca> (1992-11-06): |
718# The. . .below is based on information I got from our law library, the 719# provincial archives, and the provincial Community Services department. 720# A precise history would require digging through newspaper archives, and 721# since you didn't say what you wanted, I didn't bother. 722# 723# Saskatchewan is split by a time zone meridian (105W) and over the years 724# the boundary became pretty ragged as communities near it reevaluated 725# their affiliations in one direction or the other. In 1965 a provincial --- 41 unchanged lines hidden (view full) --- 767 -7:00 Regina M%sT 1960 Apr lastSun 2:00 768 -6:00 - CST 769Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 770 -7:00 Canada M%sT 1946 Apr lastSun 2:00 771 -7:00 Regina M%sT 1950 772 -7:00 Swift M%sT 1972 Apr lastSun 2:00 773 -6:00 - CST 774 |
775 776# Alberta 777 778# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 779Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 780Rule Edm 1918 only - Oct 31 2:00 0 S 781Rule Edm 1919 only - May 27 2:00 0 S 782Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D --- 9 unchanged lines hidden (view full) --- 792Rule Edm 1969 only - Oct lastSun 2:00 0 S 793Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 794Rule Edm 1972 max - Oct lastSun 2:00 0 S 795Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 796# Zone NAME GMTOFF RULES FORMAT [UNTIL] 797Zone America/Edmonton -7:33:52 - LMT 1906 Sep 798 -7:00 Edm M%sT 799 |
800 801# British Columbia 802 803# From Paul Eggert (1996-06-12): 804# Shanks writes that since 1970 most of this region has been like Vancouver. 805# Dawswon Creek uses MST. Much of east BC is like Edmonton. 806 807# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S --- 9 unchanged lines hidden (view full) --- 817# Zone NAME GMTOFF RULES FORMAT [UNTIL] 818Zone America/Vancouver -8:12:28 - LMT 1884 819 -8:00 Vanc P%sT 820Zone America/Dawson_Creek -8:00:56 - LMT 1884 821 -8:00 Canada P%sT 1947 822 -8:00 Vanc P%sT 1972 Aug 30 2:00 823 -7:00 - MST 824 |
825 826# Northwest Territories, Yukon 827 828# From Paul Eggert (1996-06-12): 829# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 830# Shanks's table for Watson Lake is corrupted, so we have no data there. 831 832# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 833Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 834Rule NT_YK 1918 only - Oct 27 2:00 0 S 835Rule NT_YK 1919 only - May 25 2:00 1:00 D 836Rule NT_YK 1919 only - Nov 1 0:00 0 S 837Rule NT_YK 1942 only - Feb 9 2:00 1:00 D 838Rule NT_YK 1945 only - Sep 30 2:00 0 S |
839Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 840Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 841Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 842Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 843Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 844# Zone NAME GMTOFF RULES FORMAT [UNTIL] 845Zone America/Pangnirtung -4:22:56 - LMT 1884 846 -4:00 NT_YK A%sT --- 8 unchanged lines hidden (view full) --- 855 -7:00 NT_YK M%sT 856Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 857 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 858 -8:00 NT_YK P%sT 859Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 860 -9:00 NT_YK Y%sT 1973 Oct lastSun 2:00 861 -8:00 NT_YK P%sT 862 |
863 864############################################################################### 865 866# Mexico 867 868# From Guy Harris: 869# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 870# Rules prior to 1987 are unknown. 871# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 872# observe DST." This is presumably Baja California Norte, above 28th parallel, 873# as listed there; [there is also] "Baja California Sur and N. Pacific 874# Coast (States of Sinaloa and Sonora)." 875 |
876# From Bob Devine (1988-01-28): |
877# The Federal District (where Mexico City is) has observed [DST] several 878# times but not recently. 879# 880# I don't where to drawn the line in the North Baja area. 28th latitude 881# sounds good -- but it may be higher (how far [d]o radio stations from 882# San Diego affect culture?). 883# 884# The dates of DST probably go back to 1981. The rules are the same as 885# US's. This is going to be a headache for US presidential electi[o]n years! 886 |
887# From Arthur David Olson (1988-02-13) |
888# Since the 1981 starting date is only "probable," we'll keep the 1987 889# starting date below. 890 |
891# From U. S. Naval Observatory (1989-01-19): |
892# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 893# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 894# MEXICO BAJA CAL N OF SINALOA AND SONORA) 895# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 896# MEXICO BAJA CAL N - OCT 29 897# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 898# MEXICO BAJA CAL N - 0CT 29 899# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 900# MEXICO COAHUILA, NUEVO LEON, 901# MEXICO TAMAULIPAS 902# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 903# MEXICO COAHUILA, NUEVO LEON, 904# MEXICO TAMAULIPAS APR 3 - OCT 29 905# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 906# MEXICO CAMPECHE, QUINTANA ROO AND 907# MEXICO YUCATAN 908 |
909# From Arthur David Olson (1989-01-21): |
910# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 911# USNO claims there should be four Mexican zones rather than three: 912# a zone that's GMT-8 with DST; a zone that's always GMT-7; 913# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 914 915# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 916# Shanks also says there are four zones, but disagrees about the fourth. 917# Instead of GMT-6 with DST, he says there's GMT-8 without DST. --- 50 unchanged lines hidden (view full) --- 968# Zone NAME GMTOFF RULES FORMAT [UNTIL] 969Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 970 -7:00 - MST 1927 Jun 10 23:00 971 -6:00 - CST 1930 Nov 15 972 -7:00 - MST 1931 May 1 23:00 973 -6:00 - CST 1931 Oct 974 -7:00 - MST 1932 Mar 30 23:00 975 -6:00 Mexico C%sT |
976Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 977 -7:00 - MST 1927 Jun 10 23:00 978 -6:00 - CST 1930 Nov 15 979 -7:00 - MST 1931 May 1 23:00 980 -6:00 - CST 1931 Oct 981 -7:00 - MST 1932 Mar 30 23:00 982 -6:00 - CST 1942 Apr 983 -7:00 - MST 1949 Jan 14 984 -8:00 - PST 1970 985 -7:00 Mexico M%sT |
986Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 987 -8:00 - PST 1927 Jun 10 23:00 988 -7:00 - MST 1930 Nov 16 989 -8:00 - PST 1942 Apr 990 -7:00 - MST 1949 Jan 14 991 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 992 -8:00 US P%sT 1996 993 -8:00 Mexico P%sT |
994Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 995 -8:00 - PST 1927 Jun 10 23:00 996 -7:00 - MST 1930 Nov 16 997 -8:00 - PST 1942 Apr 998 -7:00 - MST 1949 Jan 14 999 -8:00 - PST 1996 1000 -8:00 Mexico P%sT |
1001# 1002# Revillagigedo Is 1003# no information 1004 1005############################################################################### 1006 1007# Anguilla 1008# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1009Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1010 -4:00 - AST 1011 |
1012# Antigua and Barbuda 1013# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1014Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1015 -5:00 - EST 1951 1016 -4:00 - AST 1017 |
1018# Bahamas 1019# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1020Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1021Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1022Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1023# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1024Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1025 -5:00 Bahamas E%sT 1026 |
1027# Barbados 1028# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1029Rule Barb 1977 only - Jun 12 2:00 1:00 D 1030Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1031Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1032Rule Barb 1979 only - Sep 30 2:00 0 S 1033Rule Barb 1980 only - Sep 25 2:00 0 S 1034# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1035Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1036 -3:58 - BMT 1932 # Bridgetown Mean Time 1037 -4:00 Barb A%sT 1038 |
1039# Belize 1040# Whitman entirely disagrees with Shanks; go with Shanks. 1041# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1042Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1043Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1044Rule Belize 1973 only - Dec 5 0:00 1:00 D 1045Rule Belize 1974 only - Feb 9 0:00 0 S 1046Rule Belize 1982 only - Dec 18 0:00 1:00 D 1047Rule Belize 1983 only - Feb 12 0:00 0 S 1048# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1049Zone America/Belize -5:52:48 - LMT 1912 Apr 1050 -6:00 Belize C%sT 1051 |
1052# Bermuda 1053# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1054Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1055 -4:00 - AST 1974 Apr 28 2:00 1056 -4:00 Bahamas A%sT 1057 |
1058# Cayman Is 1059# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1060Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1061 -5:07 - KMT 1912 Feb # Kingston Mean Time 1062 -5:00 - EST 1063 |
1064# Clipperton 1065# uninhabited 1066 1067# Costa Rica 1068# Shanks gives some very odd dates for 1991, and stops there. 1069# For now, we won't guess further. 1070# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1071Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1072Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1073Rule CR 1991 only - Jan 19 0:00 1:00 D 1074Rule CR 1991 only - Jul 1 0:00 0 S 1075# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1076# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1077Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1078 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 1079 -6:00 CR C%sT |
1080# Coco 1081# no information; probably like America/Costa_Rica 1082 1083# Cuba 1084 |
1085# From Bob Devine (1988-01-28): |
1086# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 1087# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 1088# (I think). 1089 |
1090# From U. S. Naval Observatory (1989-01-19): |
1091# CUBA 5 H BEHIND UTC 1092# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 1093 1094# From Shanks (1991): 1095# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1096Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1097Rule Cuba 1928 only - Oct 10 0:00 0 S 1098Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D --- 20 unchanged lines hidden (view full) --- 1119Rule Cuba 1990 only - Apr 1 0:00 1:00 D 1120Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 1121 1122# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1123Zone America/Havana -5:29:28 - LMT 1890 1124 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 1125 -5:00 Cuba C%sT 1126 |
1127# Dominica 1128# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1129Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1130 -4:00 - AST 1131 |
1132# Dominican Republic 1133# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1134Rule DR 1966 only - Oct 30 0:00 1:00 D 1135Rule DR 1967 only - Feb 28 0:00 0 S 1136Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1137Rule DR 1970 only - Feb 21 0:00 0 S 1138Rule DR 1971 only - Jan 20 0:00 0 S 1139Rule DR 1972 1974 - Jan 21 0:00 0 S 1140# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1141Zone America/Santo_Domingo -4:39:36 - LMT 1890 1142 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1143 -5:00 DR E%sT 1974 Oct 27 1144 -4:00 - AST 1145 |
1146# El Salvador 1147# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1148Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1149Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1150# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 1151# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1152Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1153 -6:00 Salv C%sT 1154 |
1155# Grenada 1156# Zone NAME GMTOFF RULES FORMAT [UNTIL] |
1157Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's |
1158 -4:00 - AST 1159 |
1160# Guadeloupe 1161# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1162Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1163 -4:00 - AST 1164 |
1165# Guatemala 1166# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1167Rule Guat 1973 only - Nov 25 0:00 1:00 D 1168Rule Guat 1974 only - Feb 24 0:00 0 S 1169Rule Guat 1983 only - May 21 0:00 1:00 D 1170Rule Guat 1983 only - Sep 22 0:00 0 S 1171# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1172Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1173 -6:00 Guat C%sT 1174 |
1175# Haiti 1176# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1177Rule Haiti 1983 only - May 8 0:00 1:00 D 1178Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1179Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1180Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 1181Rule Haiti 1988 max - Oct lastSun 2:00 0 S 1182# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1183Zone America/Port-au-Prince -4:49:20 - LMT 1890 1184 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1185 -5:00 Haiti E%sT 1186 |
1187# Honduras 1188# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1189# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1190Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1191 -6:00 Salv C%sT 1192 |
1193# Jamaica 1194 |
1195# From Bob Devine (1988-01-28): |
1196# Follows US rules. 1197 |
1198# From U. S. Naval Observatory (1989-01-19): |
1199# JAMAICA 5 H BEHIND UTC 1200 1201# From Shanks (1991): 1202# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1203Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1204 -5:07 - KMT 1912 Feb # Kingston Mean Time 1205 -5:00 - EST 1974 Jan 6 2:00 1206 -5:00 US E%sT 1207 |
1208# Martinique 1209# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1210Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1211 -4:04 - FFMT 1911 May # Fort-de-France MT 1212 -4:00 - AST 1980 Apr 6 1213 -4:00 1:00 ADT 1980 Sep 28 1214 -4:00 - AST 1215 |
1216# Montserrat 1217# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1218Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 1219 -4:00 - AST 1220 |
1221# Nicaragua 1222# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1223Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1224Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1225# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1226Zone America/Managua -5:45:08 - LMT 1890 1227 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 1228 -6:00 - CST 1973 May 1229 -5:00 - EST 1975 Feb 16 1230 -6:00 Nic C%sT 1231 |
1232# Panama 1233# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1234Zone America/Panama -5:18:08 - LMT 1890 1235 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 1236 -5:00 - EST 1237 |
1238# Puerto Rico 1239# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1240# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1241Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1242 -4:00 - AST 1942 May 3 1243 -4:00 1:00 AWT 1945 Sep 30 2:00 1244 -4:00 - AST 1245 |
1246# St Kitts-Nevis 1247# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1248Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1249 -4:00 - AST 1250 |
1251# St Lucia 1252# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1253Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1254 -4:04 - CMT 1912 # Castries Mean Time 1255 -4:00 - AST 1256 |
1257# St Pierre and Miquelon 1258# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1259# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1260Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1261 -4:00 - AST 1980 May |
1262 -3:00 Mont PM%sT # Pierre & Miquelon Time |
1263 |
1264# St Vincent and the Grenadines 1265# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1266Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1267 -4:05 - KMT 1912 # Kingstown Mean Time 1268 -4:00 - AST 1269 |
1270# Turks and Caicos 1271# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1272Zone America/Grand_Turk -4:44:32 - LMT 1890 1273 -5:07 - KMT 1912 Feb # Kingston Mean Time 1274 -5:00 - EST 1979 Apr 29 2:00 1275 -5:00 US E%sT |
1276 1277# British Virgin Is 1278# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1279Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1280 -4:00 - AST 1281 |
1282# Virgin Is 1283# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1284Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1285 -4:00 - AST |