northamerica revision 14343
1# @(#)northamerica 7.22 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> (August 17, 1994): 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 17# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 18# A good source for time zone historical data in the US is 19# Thomas G. Shanks, The American Atlas (5th edition), 20# San Diego: ACS Publications, Inc. (1991). 21# Make sure you have the errata sheet; the book is somewhat useless without it. 22# It is the source for the US and Puerto Rico entries below. 23 24# From Arthur David Olson: 25# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 26# See, for example, the front page of the Saturday, October 26, 1974 27# and Sunday, October 27, 1974 editions of the Washington Post. 28 29# From Arthur David Olson: 30# Before the Uniform Time Act of 1966 took effect in 1967, observance of 31# Daylight Saving Time in the US was by local option, except during wartime. 32 33# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 34Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 35Rule US 1918 1919 - Oct lastSun 2:00 0 S 36Rule US 1942 only - Feb 9 2:00 1:00 W # War 37Rule US 1945 only - Sep 30 2:00 0 S 38Rule US 1967 max - Oct lastSun 2:00 0 S 39Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 40Rule US 1974 only - Jan 6 2:00 1:00 D 41Rule US 1975 only - Feb 23 2:00 1:00 D 42Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 43Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 44 45# From Bob Devine (January 28, 1988): 46# ...Alaska (and Hawaii) had the timezone names changed in 1967. 47# old new 48# Pacific Standard Time(PST) -same- 49# Yukon Standard Time(YST) -same- 50# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 51# Nome Standard Time (NT) Bering Standard Time (BST) 52# 53# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 54# The YST zone now covers nearly all of the state, AHST just part 55# of the Aleutian islands. No DST. 56 57# From Paul Eggert (1995-12-19): 58# The tables below use `NST', not `NT', for Nome Standard Time. 59# I invented `CAWT' for Central Alaska War Time. 60 61# From U. S. Naval Observatory (January 19, 1989): 62# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 63# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 64# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 65# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 66# USA MOUNTAIN 7 H BEHIND UTC DENVER 67# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 68# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 69# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 70# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 71# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 72# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 73# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 74# USA HAWAII 10 H BEHIND UTC 75# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 76 77# From Arthur David Olson (January 21, 1989): 78# The above dates are for 1988. 79# Note the "AKST" and "AKDT" abbreviations, the claim that there's 80# no DST in Samoa, and the claim that there is DST in Alaska and the 81# Aleutians. 82 83# From Arthur David Olson (February 13, 1988): 84# Legal standard time zone names, from United States Code (1982 Edition and 85# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 86# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 87# took effect), as explained in sections 263 and 261: 88# (none) 89# United States standard eastern time 90# United States standard mountain time 91# United States standard central time 92# United States standard Pacific time 93# (none) 94# United States standard Alaska time 95# (none) 96# Next, names from April 1, 1967 until November 30, 1983 (the date for 97# public law 98-181): 98# Atlantic standard time 99# eastern standard time 100# central standard time 101# mountain standard time 102# Pacific standard time 103# Yukon standard time 104# Alaska-Hawaii standard time 105# Bering standard time 106# And after November 30, 1983: 107# Atlantic standard time 108# eastern standard time 109# central standard time 110# mountain standard time 111# Pacific standard time 112# Alaska standard time 113# Hawaii-Aleutian standard time 114# Samoa standard time 115# The law doesn't give abbreviations. 116# 117# From Paul Eggert (1995-12-19): 118# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 119# Go with Shanks. 120 121# US Eastern time, represented by New York 122# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 123Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 124Rule NYC 1920 only - Oct lastSun 2:00 0 S 125Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 126Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 127Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 128# Zone NAME GMTOFF RULES FORMAT [UNTIL] 129Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 130 -5:00 US E%sT 1920 131 -5:00 NYC E%sT 1942 132 -5:00 US E%sT 1946 133 -5:00 NYC E%sT 1967 134 -5:00 US E%sT 135# ZONE-DESCR America New_York United_States Eastern time (except IN, KY, MI) 136 137# US Central time, represented by Chicago 138# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 139Rule Chicago 1920 only - Jun 13 2:00 1:00 D 140Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 141Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 142Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 143Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 144Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 145# Zone NAME GMTOFF RULES FORMAT [UNTIL] 146Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 147 -6:00 US C%sT 1920 148 -6:00 Chicago C%sT 1936 Mar 1 2:00 149 -5:00 - EST 1936 Nov 15 2:00 150 -6:00 Chicago C%sT 1942 151 -6:00 US C%sT 1946 152 -6:00 Chicago C%sT 1967 153 -6:00 US C%sT 154# ZONE-DESCR America Chicago United_States Central time 155 156# US Mountain time, represented by Denver 157# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 158Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 159Rule Denver 1920 only - Oct lastSun 2:00 0 S 160Rule Denver 1921 only - May 22 2:00 0 S 161Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 162Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 163# Zone NAME GMTOFF RULES FORMAT [UNTIL] 164Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 165 -7:00 US E%sT 1920 166 -7:00 Denver E%sT 1942 167 -7:00 US E%sT 1946 168 -7:00 Denver E%sT 1967 169 -7:00 US E%sT 170# ZONE-DESCR America Denver United_States Mountain time (except Arizona) 171 172# US Pacific time, represented by Los Angeles 173# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 174Rule CA 1948 only - Mar 14 2:00 1:00 D 175Rule CA 1949 only - Jan 1 2:00 0 S 176Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 177Rule CA 1950 1961 - Sep lastSun 2:00 0 S 178Rule CA 1962 1966 - Oct lastSun 2:00 0 S 179# Zone NAME GMTOFF RULES FORMAT [UNTIL] 180Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 181 -8:00 US P%sT 1946 182 -8:00 CA P%sT 1967 183 -8:00 US P%sT 184# ZONE-DESCR America Los_Angeles United_States Pacific time 185 186# Alaska 187# AK%sT is the modern abbreviation for -9:00 per USNO. 188# 189# From Paul Eggert (1995-12-19): 190# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 191# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 192# from Russia. We omit this transition, since we can't represent changes 193# from Julian to Gregorian. 194# 195# Zone NAME GMTOFF RULES FORMAT [UNTIL] 196Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 197 -8:00 - PST 1942 198 -8:00 US P%sT 1946 199 -8:00 - PST 1969 200 -8:00 US P%sT 1983 Oct 30 2:00 201 -9:00 US AK%sT 202Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 203 -9:00 - YST 1942 204 -9:00 US Y%sT 1946 205 -9:00 - YST 1969 206 -9:00 US Y%sT 1983 Oct 30 2:00 207 -9:00 US AK%sT 208Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 209 -10:00 - CAT 1942 210 -10:00 US CAT/CAWT 1946 211 -10:00 - CAT 1967 Apr 212 -10:00 - AHST 1969 213 -10:00 US AH%sT 1983 Oct 30 2:00 214 -9:00 US AK%sT 215Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 216 -11:00 - NST 1942 217 -11:00 US N%sT 1946 218 -11:00 - NST 1967 Apr 219 -11:00 - BST 1969 220 -11:00 US B%sT 1983 Oct 30 2:00 221 -9:00 US AK%sT 222Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 223 -11:00 - NST 1942 224 -11:00 US N%sT 1946 225 -11:00 - NST 1967 Apr 226 -11:00 - BST 1969 227 -11:00 US B%sT 1983 Oct 30 2:00 228 -10:00 US HA%sT 229# Shanks writes that part of southwest Alaska (e.g. Aniak) 230# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 231# and another part (e.g. Akiak) made the same switch five weeks later. 232# These switches don't quite make our 1970 cutoff. 233 234# ZONE-DESCR America Juneau United_States Alaska: Juneau 235# ZONE-DESCR America Yakutat United_States Alaska: Yakutat 236# ZONE-DESCR America Anchorage United_States Alaska: Anchorage 237# ZONE-DESCR America Nome United_States Alaska: Nome 238# ZONE-DESCR America Adak United_States Alaska: Aleutian Islands 239 240# Hawaii 241# 242# From Arthur David Olson: 243# And then there's Hawaii. 244# DST was observed for one day in 1933; 245# standard time was changed by half an hour in 1947; 246# it's always standard as of 1986. 247# 248# From Paul Eggert: 249# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 250# 251Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 252 -10:30 - HST 1933 Apr 30 2:00 253 -10:30 1:00 HDT 1933 May 21 2:00 254 -10:30 US H%sT 1947 Jun 8 2:00 255 -10:00 - HST 256 257Zone Pacific/Midway -11:49:28 - LMT 1901 258 -11:00 - NST 1967 Apr # N=Nome 259 -11:00 - BST 1983 Nov 30 # B=Bering 260 -11:00 - SST # S=Samoa 261 262# ZONE-DESCR Pacific Honolulu United_States Hawaii 263# ZONE-DESCR Pacific Midway United_States Midway Island 264 265# Now we turn to US areas that have diverged from the consensus since 1970. 266 267# Arizona mostly uses MST. 268Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 269 -7:00 US M%sT 1944 Jan 1 00:01 270 -7:00 - MST 1944 Mar 17 00:01 271 -7:00 US M%sT 1944 Oct 1 00:01 272 -7:00 - MST 1967 273 -7:00 US M%sT 1968 274 -7:00 - MST 275 276# ZONE-DESCR America Phoenix United_States Arizona (except Navajo Nation) 277 278# From Arthur David Olson (February 13, 1988): 279# A writer from the Inter Tribal Council of Arizona, Inc., 280# notes in private correspondence dated 12/28/87 that "Presently, only the 281# Navajo Nation participates in the Daylight Saving Time policy, due to its 282# large size and location in three states." (The "only" means that other 283# tribal nations don't use DST.) 284 285Link America/Denver America/Shiprock 286 287# Southern Idaho and eastern Oregon switched four weeks late in 1974. 288# Zone NAME GMTOFF RULES FORMAT [UNTIL] 289Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 290 -8:00 US P%sT 1923 May 13 2:00 291 -7:00 US M%sT 1974 292 -7:00 - MST 1974 Feb 3 2:00 293 -7:00 US M%sT 294 295# ZONE-DESCR America Boise United_States Southern Idaho and Eastern Oregon 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, 305# and writes ``Even newspaper reports present contradictory information.'' 306# Fortunately, most of the complexity occurred before our cutoff date of 1970. 307# 308# Since 1970, EST-only Indiana has been like America/Indianapolis, 309# with exceptions noted below for Crawford, Starke, and Switzerland counties. 310# The parts of Indiana not listed below have been like America/Chicago, 311# America/Louisville, or America/New_York. 312# 313# Other than Indianapolis, the Indiana place names are so nondescript 314# that they would be ambiguous if we left them at the `America' level. 315# So we reluctantly put them all in a subdirectory `America/Indiana'. 316# 317# Most of EST-only Indiana last observed DST in 1970. 318# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 319Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 320Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 321Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 322# Zone NAME GMTOFF RULES FORMAT [UNTIL] 323Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 324 -6:00 US C%sT 1920 325 -6:00 Indianapolis C%sT 1942 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# ZONE-DESCR America Indianapolis United_States Indiana: Indianapolis 336 337# 338# Part of Crawford County, Indiana, last observed DST in 1975, 339# and left its clocks alone in 1974. 340# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 341Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 342Rule Marengo 1951 only - Sep lastSun 2:00 0 S 343Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 344Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 345# Zone NAME GMTOFF RULES FORMAT [UNTIL] 346Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 347 -6:00 US C%sT 1951 348 -6:00 Marengo C%sT 1961 Apr 30 2:00 349 -5:00 - EST 1969 350 -5:00 US E%sT 1974 Jan 6 2:00 351 -6:00 1:00 CDT 1974 Oct 27 2:00 352 -5:00 US E%sT 1976 353 -5:00 - EST 354 355# sorry, tzsetup needs two-level names 356Link America/Indiana/Marengo America/Marengo_IN 357# ZONE-DESCR America Marengo_IN United_States Indiana: Crawford County 358 359# 360# Starke County, Indiana 361# From Arthur David Olson (October 28, 1991): 362# An article on page A3 of the Sunday, October 27, 1991 Washington Post 363# notes that Starke County switched from Central time to Eastern time as of 364# October 27, 1991. 365# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 366Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 367Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 368Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 369Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 370Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 371# Zone NAME GMTOFF RULES FORMAT [UNTIL] 372Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 373 -6:00 US C%sT 1947 374 -6:00 Starke C%sT 1962 Apr 29 2:00 375 -5:00 - EST 1963 Oct 27 2:00 376 -6:00 US C%sT 1991 Oct 27 2:00 377 -5:00 - EST 378 379Link America/Indiana/Knox America/Knox_IN 380# ZONE-DESCR America Knox_IN United_States Indiana: Starke County 381 382# 383# Switzerland County, Indiana, last observed DST in 1972. 384# Zone NAME GMTOFF RULES FORMAT [UNTIL] 385Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 386 -6:00 US C%sT 1954 Apr 25 2:00 387 -5:00 - EST 1969 388 -5:00 US E%sT 1973 389 -5:00 - EST 390 391Link America/Indiana/Vevay America/Vevay_IN 392# ZONE-DESCR America Vevay_IN United_States Indiana: Switzerland County 393 394# Part of Kentucky left its clocks alone in 1974. 395# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 396Rule Louisville 1921 only - May 1 2:00 1:00 D 397Rule Louisville 1921 only - Sep 1 2:00 0 S 398Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 399Rule Louisville 1941 only - Sep lastSun 2:00 0 S 400Rule Louisville 1946 only - Jun 2 2:00 0 S 401Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 402Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 403# Zone NAME GMTOFF RULES FORMAT [UNTIL] 404Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 405 -6:00 US C%sT 1921 406 -6:00 Louisville C%sT 1942 407 -6:00 US C%sT 1946 408 -6:00 Louisville C%sT 1961 Jul 23 2:00 409 -5:00 - EST 1968 410 -5:00 US E%sT 1974 Jan 6 2:00 411 -6:00 1:00 CDT 1974 Oct 27 2:00 412 -5:00 US E%sT 413 414# ZONE-DESCR America Louisville United_States Kentucky: Louisville area 415 416# Michigan 417# 418# From Bob Devine (January 28, 1988): 419# Michigan didn't observe DST from 1968 to 1973. 420# 421# From Paul Eggert (1995-12-19): 422# Shanks writes that Michigan started using standard time on 1885 Sep 18, 423# but Howse (p 126) writes that Detroit kept 424# 425# local time until 1900 when the City Council decreed that clocks should 426# be put back twenty-eight minutes to Central Standard Time. Half the 427# city obeyed, half refused. After considerable debate, the decision 428# was rescinded and the city reverted to Sun time. A derisive offer to 429# erect a sundial in front of the city hall was referred to the 430# Committee on Sewers. Then, in 1905, Central time was adopted 431# by city vote. 432# 433# This story is too entertaining to be false, so go with Howse over Shanks. 434# 435# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 436# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 437Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 438Rule Detroit 1948 only - Sep lastSun 2:00 0 S 439Rule Detroit 1967 only - Jun 14 2:00 1:00 D 440Rule Detroit 1967 only - Oct lastSun 2:00 0 S 441# Zone NAME GMTOFF RULES FORMAT [UNTIL] 442Zone America/Detroit -5:32:11 - LMT 1905 443 -6:00 - CST 1915 May 15 2:00 444 -5:00 - EST 1942 445 -5:00 US E%sT 1946 446 -5:00 Detroit E%sT 1973 447 -5:00 US E%sT 1975 448 -5:00 - EST 1975 Apr 27 2:00 449 -5:00 US E%sT 450 451# ZONE-DESCR America Detroit United_States Michigan: Mainland 452 453# 454# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 455# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 456Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 457Rule Menominee 1946 only - Sep lastSun 2:00 0 S 458Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 459Rule Menominee 1966 only - Oct lastSun 2:00 0 S 460# Zone NAME GMTOFF RULES FORMAT [UNTIL] 461Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 462 -6:00 US C%sT 1946 463 -6:00 Menominee C%sT 1969 Apr 27 2:00 464 -5:00 - EST 1973 Apr 29 2:00 465 -6:00 US C%sT 466 467# ZONE-DESCR America Menominee United_States Michigan: Upper Peninsula 468 469# Navassa 470# uninhabited 471 472# Navassa 473# no information; probably like US/Eastern 474 475################################################################################ 476 477 478# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 479# A good source for time zone historical data outside the US is 480# Thomas G. Shanks, The International Atlas (3rd edition), 481# San Diego: ACS Publications, Inc. (1991). 482# Except where otherwise noted, it is the source for the data below. 483# 484# Another source occasionally used is Edward W. Whitman, World Time Differences, 485# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 486# I found in the UCLA library. 487# 488# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 489# Corrections are welcome! 490# 491# See the `europe' file for Greenland. 492# 493# See the `africa' file for Zone naming conventions. 494 495 496 497# Canada 498 499# Canada is reportedly lots easier than the US--leastways since 1951. 500# I don't know what they did before then. 501# 4.3BSD claims that it's perfectly regular. 502# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 503# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 504# "...Canada (well, Ontario and at least some of the other provinces) are 505# adopting the new daylight savings time rules...". We assume all of 506# Canada is doing so. 507 508# From Bob Devine (January 28, 1988): 509# All of Canada did have DST from your first rule except Saskatchewan. 510# Which parts did not observe DST is hard to pinpoint but most of the 511# province follows the rules. 512# NOTE: those that didn't have DST for that rule, also 513# probably did not have it for several years previous. 514 515# From U. S. Naval Observatory (January 19, 1989): 516# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 517# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 518# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 519# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 520# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 521# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 522# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 523# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 524# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 525# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 526# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 527# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 528# CANADA YUKON SAME AS PACIFIC DAWSON 529 530# From Arthur David Olson (January 21, 1989): 531# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 532# Note claim that there's double DST in Newfoundland and that Yukon should 533# be same as Pacific. 534 535# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 536# The. . .below is based on information I got from our law library, the 537# provincial archives, and the provincial Community Services department. 538# A precise history would require digging through newspaper archives, and 539# since you didn't say what you wanted, I didn't bother. 540# 541# Saskatchewan is split by a time zone meridian (105W) and over the years 542# the boundary became pretty ragged as communities near it reevaluated 543# their affiliations in one direction or the other. In 1965 a provincial 544# referendum favoured legislating common time practices. 545# 546# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 547# Saskatchewan 1978) was proclaimed, and established that the eastern 548# part of Saskatchewan would use CST year round, that districts in 549# northwest Saskatchewan would by default follow CST but could opt to 550# follow Mountain Time rules (thus 1 hour difference in the winter and 551# zero in the summer), and that districts in southwest Saskatchewan would 552# by default follow MT but could opt to follow CST. 553# 554# It took a few years for the dust to settle (I know one story of a town 555# on one time zone having its school in another, such that a mom had to 556# serve her family lunch in two shifts), but presently it seems that only 557# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 558# rules any more; all other districts appear to have used CST year round 559# since sometime in the 1960s. 560# 561# Here's how I would summarize things. Establish a "Saskatchewan" CST 562# time zone, and note that it officially exists as of 15 April 1966. Any 563# current exceptions can put themselves in the "Mountain" zone, since 564# those are the rules they follow. Any past exceptions can be forgotten, 565# since that's what those who live here have done. 566 567# From Arthur David Olson (November 21, 1992): 568# East-Saskatchewan kept to avoid problems for folks using that zone by name; 569# plain Saskatchewan added. 570 571# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 572# I post here the time zone abbreviations standardized in Canada 573# for both English and French in the CAN/CSA-Z234.4-89 standard.... 574# 575# UTC Standard time Daylight savings time 576# offset French English French English 577# -2:30 - - HAT NDT 578# -3 - - HAA ADT 579# -3:30 HNT NST - - 580# -4 HNA AST HAE EDT 581# -5 HNE EST HAC CDT 582# -6 HNC CST HAR MDT 583# -7 HNR MST HAP PDT 584# -8 HNP PST HAY YDT 585# -9 HNY YST - - 586# 587# HN: Heure Normale ST: Standard Time 588# HA: Heure Avanc<e'>e DT: Daylight saving Time 589# 590# A: de l'Atlantique Atlantic 591# C: du Centre Central 592# E: de l'Est Eastern 593# M: Mountain 594# N: Newfoundland 595# P: du Pacifique Pacific 596# R: des Rocheuses 597# T: de Terre-Neuve 598# Y: du Yukon Yukon 599# 600# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 601# Alas, this sort of thing must be handled by localization software. 602 603 604 605# From Shanks (1991): 606# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 607Rule StJohns 1884 only - Jan 1 0:00 0 S 608Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 609Rule StJohns 1917 only - Sep 17 2:00 0 S 610Rule StJohns 1918 only - Oct 31 2:00 0 S 611# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 612Rule StJohns 1919 only - May 5 23:00 1:00 D 613Rule StJohns 1919 only - Aug 12 23:00 0 S 614# For 1931-1935 Whitman gives Apr same date; go with Shanks. 615Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 616Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 617# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 618Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 619Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 620# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 621Rule StJohns 1942 only - Mar 1 0:00 1:00 D 622Rule StJohns 1942 only - Dec 31 0:00 0 S 623Rule StJohns 1943 only - May 30 0:00 1:00 D 624Rule StJohns 1943 only - Sep 5 0:00 0 S 625Rule StJohns 1944 only - Jul 10 0:00 1:00 D 626Rule StJohns 1944 only - Sep 2 0:00 0 S 627Rule StJohns 1945 only - Jan 1 0:00 1:00 D 628Rule StJohns 1945 only - Oct 7 2:00 0 S 629# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 630# Apr 30 - Sep 24; go with Shanks. 631Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 632Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 633Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 634Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 635Rule StJohns 1960 max - Oct lastSun 2:00 0 S 636Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 637Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 638Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 639# St John's has an apostrophe, but Posix file names can't have apostrophes. 640# Zone NAME GMTOFF RULES FORMAT [UNTIL] 641Zone America/St_Johns -3:30:52 - LMT 1884 642 -3:31 StJohns N%sT 1935 Mar 30 643 -3:30 StJohns N%sT 644 645# ZONE-DESCR America St_Johns Canada Newfoundland 646 647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 648Rule Halifax 1902 only - Jun 15 0:00 0 S 649Rule Halifax 1916 only - Apr 1 0:00 1:00 D 650Rule Halifax 1916 only - Oct 1 0:00 0 S 651Rule Halifax 1918 only - Apr 14 2:00 1:00 D 652Rule Halifax 1918 only - Oct 31 2:00 0 S 653Rule Halifax 1920 only - May 9 0:00 1:00 D 654Rule Halifax 1920 only - Aug 29 0:00 0 S 655Rule Halifax 1921 only - May 6 0:00 1:00 D 656Rule Halifax 1921 1922 - Sep 5 0:00 0 S 657Rule Halifax 1922 only - Apr 30 0:00 1:00 D 658Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 659Rule Halifax 1923 only - Sep 4 0:00 0 S 660Rule Halifax 1924 only - Sep 15 0:00 0 S 661Rule Halifax 1925 only - Sep 28 0:00 0 S 662Rule Halifax 1926 only - May 16 0:00 1:00 D 663Rule Halifax 1926 only - Sep 13 0:00 0 S 664Rule Halifax 1927 only - May 1 0:00 1:00 D 665Rule Halifax 1927 only - Sep 26 0:00 0 S 666Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 667Rule Halifax 1928 only - Sep 9 0:00 0 S 668Rule Halifax 1929 only - Sep 3 0:00 0 S 669Rule Halifax 1930 only - Sep 15 0:00 0 S 670Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 671Rule Halifax 1933 only - Apr 30 0:00 1:00 D 672Rule Halifax 1933 only - Oct 2 0:00 0 S 673Rule Halifax 1934 only - May 20 0:00 1:00 D 674Rule Halifax 1934 only - Sep 16 0:00 0 S 675Rule Halifax 1935 only - Jun 2 0:00 1:00 D 676Rule Halifax 1935 only - Sep 30 0:00 0 S 677Rule Halifax 1936 only - Jun 1 0:00 1:00 D 678Rule Halifax 1936 only - Sep 14 0:00 0 S 679Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 680Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 681Rule Halifax 1939 only - May 28 0:00 1:00 D 682Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 683Rule Halifax 1942 only - Feb 9 2:00 1:00 D 684Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 685Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 686Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 687Rule Halifax 1962 max - Oct lastSun 2:00 0 S 688Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 689# Zone NAME GMTOFF RULES FORMAT [UNTIL] 690Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 691 -4:00 Halifax A%sT 692 693# ZONE-DESCR America Halifax Canada Atlantic time 694 695# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 696Rule Mont 1884 only - Jan 1 0:00 0 S 697Rule Mont 1917 only - Mar 25 2:00 1:00 D 698Rule Mont 1917 only - Apr 24 0:00 0 S 699Rule Mont 1918 only - Apr 14 2:00 1:00 D 700Rule Mont 1918 only - Oct 31 2:00 0 S 701Rule Mont 1919 only - Mar 31 2:30 1:00 D 702Rule Mont 1919 only - Oct 25 2:30 0 S 703Rule Mont 1920 only - May 2 2:30 1:00 D 704Rule Mont 1920 only - Oct 3 2:30 0 S 705Rule Mont 1921 only - May 1 2:00 1:00 D 706Rule Mont 1921 only - Oct 2 2:30 0 S 707Rule Mont 1922 only - Apr 30 2:00 1:00 D 708Rule Mont 1922 only - Oct 1 2:30 0 S 709Rule Mont 1924 only - May 17 2:00 1:00 D 710Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 711Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 712Rule Mont 1927 only - May 1 0:00 1:00 D 713Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 714Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 715Rule Mont 1932 only - May 1 0:00 1:00 D 716Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 717Rule Mont 1933 only - Oct 1 0:00 0 S 718Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 719Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 720Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 721Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 722Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 723Rule Mont 1957 max - Oct lastSun 2:00 0 S 724Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 725# Zone NAME GMTOFF RULES FORMAT [UNTIL] 726Zone America/Montreal -4:54:16 - LMT 1884 727 -5:00 Mont E%sT 728 729# ZONE-DESCR America Montreal Canada Eastern time 730 731# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 732Rule Winn 1887 only - Jul 16 0:00 0 S 733Rule Winn 1916 only - Apr 23 0:00 1:00 D 734Rule Winn 1916 only - Sep 17 0:00 0 S 735Rule Winn 1918 only - Apr 14 2:00 1:00 D 736Rule Winn 1918 only - Oct 31 2:00 0 S 737Rule Winn 1937 only - May 16 2:00 1:00 D 738Rule Winn 1937 only - Sep 26 2:00 0 S 739Rule Winn 1942 only - Feb 9 2:00 1:00 D 740Rule Winn 1945 only - Sep lastSun 2:00 0 S 741Rule Winn 1946 only - May 12 2:00 1:00 D 742Rule Winn 1946 only - Oct 13 2:00 0 S 743Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 744Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 745Rule Winn 1950 only - May 1 2:00 1:00 D 746Rule Winn 1950 only - Sep 30 2:00 0 S 747Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 748Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 749Rule Winn 1959 only - Oct lastSun 2:00 0 S 750Rule Winn 1960 only - Sep lastSun 2:00 0 S 751Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 752Rule Winn 1963 only - Sep 22 2:00 0 S 753Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 754Rule Winn 1966 max - Oct lastSun 2:00 0 S 755Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 756# Zone NAME GMTOFF RULES FORMAT [UNTIL] 757Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 758 -6:00 Winn C%sT 759 760# ZONE-DESCR America Winnipeg Canada Manitoba 761 762# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 763Rule Regina 1905 only - Sep 1 0:00 0 S 764Rule Regina 1918 only - Apr 14 2:00 1:00 D 765Rule Regina 1918 only - Oct 31 2:00 0 S 766Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 767Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 768Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 769Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 770Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 771Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 772Rule Regina 1942 only - Feb 9 2:00 1:00 D 773Rule Regina 1945 only - Sep lastSun 2:00 0 S 774Rule Regina 1946 only - Apr 14 2:00 1:00 D 775Rule Regina 1946 only - Oct 13 2:00 0 S 776Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 777Rule Regina 1947 1959 - Sep lastSun 2:00 0 S 778# Zone NAME GMTOFF RULES FORMAT [UNTIL] 779Zone America/Regina -6:58:36 - LMT 1905 Sep 780 -7:00 Regina M%sT 1966 Apr 15 781 -6:00 - CST 782 783# ZONE-DESCR America Regina Canada Saskatchewan 784 785# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 786Rule Edm 1906 only - Sep 1 0:00 0 S 787Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 788Rule Edm 1918 only - Oct 31 2:00 0 S 789Rule Edm 1919 only - May 27 2:00 0 S 790Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 791Rule Edm 1920 only - Oct lastSun 2:00 0 S 792Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 793Rule Edm 1942 only - Feb 9 2:00 1:00 D 794Rule Edm 1945 only - Sep lastSun 2:00 0 S 795Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 796Rule Edm 1947 only - Sep lastSun 2:00 0 S 797Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 798Rule Edm 1967 only - Oct lastSun 2:00 0 S 799Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 800Rule Edm 1969 only - Oct lastSun 2:00 0 S 801Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 802Rule Edm 1972 max - Oct lastSun 2:00 0 S 803Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 804# Zone NAME GMTOFF RULES FORMAT [UNTIL] 805Zone America/Edmonton -7:33:52 - LMT 1906 Sep 806 -7:00 Edm M%sT 807 808# ZONE-DESCR America Edmonton Canada Alberta 809 810# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 811Rule Vanc 1884 only - Jan 1 0:00 0 S 812Rule Vanc 1918 only - Apr 14 2:00 1:00 D 813Rule Vanc 1918 only - Oct 31 2:00 0 S 814Rule Vanc 1942 only - Feb 9 2:00 1:00 D 815Rule Vanc 1945 only - Sep 30 2:00 0 S 816Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 817Rule Vanc 1946 only - Oct 13 2:00 0 S 818Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 819Rule Vanc 1962 max - Oct lastSun 2:00 0 S 820Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 821# Zone NAME GMTOFF RULES FORMAT [UNTIL] 822Zone America/Vancouver -8:12:28 - LMT 1884 823 -8:00 Vanc P%sT 824 825# ZONE-DESCR America Vancouver Canada British Columbia 826 827# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 828Rule Yukon 1900 only - Jan 1 0:00 0 S 829Rule Yukon 1918 only - Apr 14 2:00 1:00 D 830Rule Yukon 1918 only - Oct 27 2:00 0 S 831Rule Yukon 1919 only - May 25 2:00 1:00 D 832Rule Yukon 1919 only - Nov 1 0:00 0 S 833Rule Yukon 1942 only - Feb 9 2:00 1:00 D 834Rule Yukon 1965 only - Apr 25 0:00 1:00 D 835Rule Yukon 1965 only - Oct 31 2:00 0 S 836Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 837Rule Yukon 1980 max - Oct lastSun 2:00 0 S 838Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 839# Zone NAME GMTOFF RULES FORMAT [UNTIL] 840Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 841 -9:00 Yukon Y%sT 1966 Jul 842 -8:00 Yukon P%sT 843# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 844 845# ZONE-DESCR America Whitehorse Canada Yukon Territory 846 847############################################################################### 848 849# Mexico 850 851# From Guy Harris: 852# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 853# Rules prior to 1987 are unknown. 854# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 855# observe DST." This is presumably Baja California Norte, above 28th parallel, 856# as listed there; [there is also] "Baja California Sur and N. Pacific 857# Coast (States of Sinaloa and Sonora)." 858 859# From Bob Devine (January 28, 1988): 860# The Federal District (where Mexico City is) has observed [DST] several 861# times but not recently. 862# 863# I don't where to drawn the line in the North Baja area. 28th latitude 864# sounds good -- but it may be higher (how far [d]o radio stations from 865# San Diego affect culture?). 866# 867# The dates of DST probably go back to 1981. The rules are the same as 868# US's. This is going to be a headache for US presidential electi[o]n years! 869 870# From Arthur David Olson (February 13, 1988) 871# Since the 1981 starting date is only "probable," we'll keep the 1987 872# starting date below. 873 874# From U. S. Naval Observatory (January 19, 1989): 875# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 876# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 877# MEXICO BAJA CAL N OF SINALOA AND SONORA) 878# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 879# MEXICO BAJA CAL N - OCT 29 880# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 881# MEXICO BAJA CAL N - 0CT 29 882# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 883# MEXICO COAHUILA, NUEVO LEON, 884# MEXICO TAMAULIPAS 885# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 886# MEXICO COAHUILA, NUEVO LEON, 887# MEXICO TAMAULIPAS APR 3 - OCT 29 888# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 889# MEXICO CAMPECHE, QUINTANA ROO AND 890# MEXICO YUCATAN 891 892# From Arthur David Olson (January 21, 1989): 893# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 894# USNO claims there should be four Mexican zones rather than three: 895# a zone that's GMT-8 with DST; a zone that's always GMT-7; 896# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 897 898# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 899# Shanks also says there are four zones, but disagrees about the fourth. 900# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 901 902# From Paul Eggert (1996-02-07): 903# Today in news:4f90v4$g6g@news.internet.com.mx, Kevin Pitts 904# <bravo2@internet.com.mx> wrote that Mexico will use Horario de Verano (DST) 905# starting this year with the same rules as the US, and gave FIDE as a source. 906# (FIDE is a private organization that promotes efficient electrical use.) 907# On 1996-02-02 Mario Camou wrote that the transition times are Apr Sun>=1 908# 0:00 and Nov 1 0:00 but also wrote ``The DST-out date looks a bit fishy''. 909# Go with Pitts after 1996, and with Shanks before that. 910 911# From Shanks (1991): 912# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 913Rule Mexico 1922 only - Jan 1 0:00 0 S 914Rule Mexico 1939 only - Feb 5 0:00 1:00 D 915Rule Mexico 1939 only - Jun 25 0:00 0 S 916Rule Mexico 1940 only - Dec 9 0:00 1:00 D 917Rule Mexico 1941 only - Apr 1 0:00 0 S 918Rule Mexico 1943 only - Dec 16 0:00 1:00 D 919Rule Mexico 1944 only - May 1 0:00 0 S 920Rule Mexico 1950 only - Feb 12 0:00 1:00 D 921Rule Mexico 1950 only - Jul 30 0:00 0 S 922Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 923Rule Mexico 1996 max - Oct lastSun 2:00 0 S 924# 925Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 926Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S 927Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S 928# Zone NAME GMTOFF RULES FORMAT [UNTIL] 929Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 930 -7:00 - MST 1927 Jun 10 23:00 931 -6:00 - CST 1930 Nov 15 932 -7:00 - MST 1931 May 1 23:00 933 -6:00 - CST 1931 Oct 934 -7:00 - MST 1932 Mar 30 23:00 935 -6:00 Mexico C%sT 936# ZONE-DESCR America Mexico_City Mexico Mexico City 937Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 938 -7:00 - MST 1927 Jun 10 23:00 939 -6:00 - CST 1930 Nov 15 940 -7:00 - MST 1931 May 1 23:00 941 -6:00 - CST 1931 Oct 942 -7:00 - MST 1932 Mar 30 23:00 943 -6:00 - CST 1942 Apr 944 -7:00 - MST 1949 Jan 14 945 -8:00 - PST 1970 946 -7:00 Mexico M%sT 947# ZONE-DESCR America Mazatlan Mexico Mazatlan 948Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 949 -8:00 - PST 1927 Jun 10 23:00 950 -7:00 - MST 1930 Nov 16 951 -8:00 - PST 1942 Apr 952 -7:00 - MST 1949 Jan 14 953 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 954 -8:00 US P%sT 1996 955 -8:00 Mexico P%sT 956# ZONE-DESCR America Tijuana Mexico Baja California Norte 957Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 958 -8:00 - PST 1927 Jun 10 23:00 959 -7:00 - MST 1930 Nov 16 960 -8:00 - PST 1942 Apr 961 -7:00 - MST 1949 Jan 14 962 -8:00 - PST 1996 963 -8:00 Mexico P%sT 964# ZONE-DESCR America Ensenada Mexico Ensenada 965 966# 967# Revillagigedo Is 968# no information 969 970############################################################################### 971 972# Anguilla 973# Zone NAME GMTOFF RULES FORMAT [UNTIL] 974Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 975 -4:00 - AST 976 977# ZONE-DESCR America Anguilla Anguilla All points 978 979# Antigua and Barbuda 980# Zone NAME GMTOFF RULES FORMAT [UNTIL] 981Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 982 -5:00 - EST 1951 983 -4:00 - AST 984 985# ZONE-DESCR America Antigua Antigua All points 986 987# Bahamas 988# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 989Rule Bahamas 1912 only - Mar 2 0:00 0 S 990Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 991Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 992Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 993# Zone NAME GMTOFF RULES FORMAT [UNTIL] 994Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 995 -5:00 Bahamas E%sT 996 997# ZONE-DESCR America Nassau Bahamas All points 998 999# Barbados 1000# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1001Rule Barb 1932 only - Jan 1 0:00 0 S 1002Rule Barb 1977 only - Jun 12 2:00 1:00 D 1003Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1004Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1005Rule Barb 1979 only - Sep 30 2:00 0 S 1006Rule Barb 1980 only - Sep 25 2:00 0 S 1007# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1008Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1009 -3:58 - BMT 1932 # Bridgetown Mean Time 1010 -4:00 Barb A%sT 1011 1012# ZONE-DESCR America Barbados Barbados All points 1013 1014# Belize 1015# Whitman entirely disagrees with Shanks; go with Shanks. 1016# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1017Rule Belize 1912 only - Apr 1 0:00 0 S 1018Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1019Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1020Rule Belize 1973 only - Dec 5 0:00 1:00 D 1021Rule Belize 1974 only - Feb 9 0:00 0 S 1022Rule Belize 1982 only - Dec 18 0:00 1:00 D 1023Rule Belize 1983 only - Feb 12 0:00 0 S 1024# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1025Zone America/Belize -5:52:48 - LMT 1912 Apr 1026 -6:00 Belize C%sT 1027 1028# ZONE-DESCR America Belize Belize All points 1029 1030# Bermuda 1031# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1032Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1033 -4:00 - AST 1974 Apr 28 2:00 1034 -4:00 Bahamas A%sT 1035 1036# ZONE-DESCR Atlantic Bermuda Bermuda All points 1037 1038# Cayman Is 1039# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1040Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1041 -5:07 - KMT 1912 Feb # Kingston Mean Time 1042 -5:00 - EST 1043 1044# ZONE-DESCR America Cayman Cayman_Islands All points 1045 1046# Clipperton 1047# uninhabited 1048 1049# Costa Rica 1050# Shanks gives some very odd dates for 1991, and stops there. 1051# For now, we won't guess further. 1052# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1053Rule CR 1921 only - Jan 15 0:00 0 S 1054Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1055Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1056Rule CR 1991 only - Jan 19 0:00 1:00 D 1057Rule CR 1991 only - Jul 1 0:00 0 S 1058# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1059# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1060Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1061 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 1062 -6:00 CR C%sT 1063# ZONE-DESCR America Costa_Rica Costa_Rica All points 1064 1065# Coco 1066# no information; probably like America/Costa_Rica 1067 1068# Cuba 1069 1070# From Bob Devine (January 28, 1988): 1071# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 1072# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 1073# (I think). 1074 1075# From U. S. Naval Observatory (January 19, 1989): 1076# CUBA 5 H BEHIND UTC 1077# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 1078 1079# From Shanks (1991): 1080# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1081Rule Cuba 1925 only - Jul 19 12:00 0 S 1082Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1083Rule Cuba 1928 only - Oct 10 0:00 0 S 1084Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1085Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1086Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1087Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1088Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1089Rule Cuba 1965 only - Sep 30 0:00 0 S 1090Rule Cuba 1966 only - May 29 0:00 1:00 D 1091Rule Cuba 1966 only - Oct 2 0:00 0 S 1092Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1093Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1094Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1095Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1096Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1097Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1098Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1099Rule Cuba 1978 only - May 7 0:00 1:00 D 1100Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 1101Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1102Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1103Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S 1104Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1105Rule Cuba 1990 only - Apr 1 0:00 1:00 D 1106Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 1107 1108# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1109Zone America/Havana -5:29:28 - LMT 1890 1110 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 1111 -5:00 Cuba C%sT 1112 1113# ZONE-DESCR America Havana Cuba All points 1114 1115# Dominica 1116# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1117Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1118 -4:00 - AST 1119 1120# ZONE-DESCR America Dominica Dominica All points 1121 1122# Dominican Republic 1123# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1124Rule DR 1933 only - Apr 1 12:00 0 S 1125Rule DR 1966 only - Oct 30 0:00 1:00 D 1126Rule DR 1967 only - Feb 28 0:00 0 S 1127Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1128Rule DR 1970 only - Feb 21 0:00 0 S 1129Rule DR 1971 only - Jan 20 0:00 0 S 1130Rule DR 1972 1974 - Jan 21 0:00 0 S 1131# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1132Zone America/Santo_Domingo -4:39:36 - LMT 1890 1133 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1134 -5:00 DR E%sT 1974 Oct 27 1135 -4:00 - AST 1136 1137# ZONE-DESCR America Santo_Domingo Dominican_Republic All points 1138 1139# El Salvador 1140# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1141Rule Salv 1921 only - Jan 1 0:00 0 S 1142Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1143Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1144# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 1145# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1146Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1147 -6:00 Salv C%sT 1148 1149# ZONE-DESCR America El_Salvador El_Salvador All points 1150 1151# Grenada 1152# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1153Zone America/Grenada -4:07:00 - LMT 1911 Jul 1154 -4:00 - AST 1155 1156# ZONE-DESCR America Grenada Grenada All points 1157 1158# Guadeloupe 1159# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1160Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1161 -4:00 - AST 1162 1163# ZONE-DESCR America Guadeloupe Guadeloupe All points 1164 1165# Guatemala 1166# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1167Rule Guat 1918 only - Oct 5 0:00 0 S 1168Rule Guat 1973 only - Nov 25 0:00 1:00 D 1169Rule Guat 1974 only - Feb 24 0:00 0 S 1170Rule Guat 1983 only - May 21 0:00 1:00 D 1171Rule Guat 1983 only - Sep 22 0:00 0 S 1172# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1173Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1174 -6:00 Guat C%sT 1175 1176# ZONE-DESCR America Guatemala Guatemala All points 1177 1178# Haiti 1179# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1180Rule Haiti 1917 only - Jan 24 12:00 0 S 1181Rule Haiti 1983 only - May 8 0:00 1:00 D 1182Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1183Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1184Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 1185Rule Haiti 1988 max - Oct lastSun 2:00 0 S 1186# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1187Zone America/Port-au-Prince -4:49:20 - LMT 1890 1188 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1189 -5:00 Haiti E%sT 1190 1191# ZONE-DESCR America Port-au-Prince Haiti All points 1192 1193# Honduras 1194# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1195# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1196Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1197 -6:00 Salv C%sT 1198 1199# ZONE-DESCR America Tegucigalpa Honduras All points 1200 1201# Jamaica 1202 1203# From Bob Devine (January 28, 1988): 1204# Follows US rules. 1205 1206# From U. S. Naval Observatory (January 19, 1989): 1207# JAMAICA 5 H BEHIND UTC 1208 1209# From Shanks (1991): 1210# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1211Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1212 -5:07 - KMT 1912 Feb # Kingston Mean Time 1213 -5:00 - EST 1974 Jan 6 2:00 1214 -5:00 US E%sT 1215 1216# ZONE-DESCR America Jamaica Jamaica All points 1217 1218# Martinique 1219# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1220Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1221 -4:04 - FFMT 1911 May # Fort-de-France MT 1222 -4:00 - AST 1980 Apr 6 1223 -4:00 1:00 ADT 1980 Sep 28 1224 -4:00 - AST 1225 1226# ZONE-DESCR America Martinique Martinique All points 1227 1228# Montserrat 1229# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1230Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 1231 -4:00 - AST 1232 1233# ZONE-DESCR America Montserrat Montserrat All points 1234 1235# Nicaragua 1236# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1237Rule Nic 1975 only - Feb 16 0:00 0 S 1238Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1239Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1240# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1241Zone America/Managua -5:45:08 - LMT 1890 1242 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 1243 -6:00 - CST 1973 May 1244 -5:00 - EST 1975 Feb 16 1245 -6:00 Nic C%sT 1246 1247# ZONE-DESCR America Managua Nicaragua All points 1248 1249# Panama 1250# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1251Zone America/Panama -5:18:08 - LMT 1890 1252 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 1253 -5:00 - EST 1254 1255# ZONE-DESCR America Panama Panama All points 1256 1257# Puerto Rico 1258# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1259# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1260Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1261 -4:00 - AST 1942 May 3 1262 -4:00 1:00 AWT 1945 Sep 30 2:00 1263 -4:00 - AST 1264 1265# ZONE-DESCR America Puerto_Rico United_States Puerto Rico 1266 1267# St Kitts-Nevis 1268# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1269Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1270 -4:00 - AST 1271 1272# ZONE-DESCR America St_Kitts St_Kitts_and_Nevis All points 1273 1274# St Lucia 1275# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1276Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1277 -4:04 - CMT 1912 # Castries Mean Time 1278 -4:00 - AST 1279 1280# ZONE-DESCR America St_Lucia St_Lucia All points 1281 1282# St Pierre and Miquelon 1283# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1284# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1285Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1286 -4:00 - AST 1980 May 1287 -3:00 Mont SP%sT 1288 1289# ZONE-DESCR America Miquelon France St. Pierre and Miquelon 1290 1291# St Vincent and the Grenadines 1292# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1293Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1294 -4:05 - KMT 1912 # Kingstown Mean Time 1295 -4:00 - AST 1296 1297# ZONE-DESCR America St_Vincent St_Vincent All points 1298 1299# Turks and Caicos 1300# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1301Zone America/Grand_Turk -4:44:32 - LMT 1890 1302 -5:07 - KMT 1912 Feb # Kingston Mean Time 1303 -5:00 - EST 1979 Apr 29 2:00 1304 -5:00 US E%sT 1305# ZONE-DESCR America Grand_Turk Turks_and_Caicos All points 1306 1307# British Virgin Is 1308# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1309Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1310 -4:00 - AST 1311 1312# ZONE-DESCR America Tortola United_Kingdom British Virgin Islands 1313 1314# Virgin Is 1315# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1316Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1317 -4:00 - AST 1318 1319# ZONE-DESCR America St_Thomas United_States Virgin Islands 1320