northamerica revision 2742
1# @(#)northamerica 7.11 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 Arthur David Olson: 18# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 19# See, for example, the front page of the Saturday, October 26, 1974 20# and Sunday, October 27, 1974 editions of the Washington Post. 21 22# From seismo!munnari!kre: 23# I recall also being told by someone once that Canada didn't have 24# the DST variations in 74/75 that the US did, but I am not nearly 25# sure enough of this to add anything. 26 27# From Arthur David Olson: 28# The above has been confirmed by Bob Devine; we'll go with it here. 29 30# From Arthur David Olson: 31# Before the Uniform Time Act of 1966 took effect in 1967, observance of 32# Daylight Saving Time in the US was by local option, except during wartime. 33 34# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 35Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 36Rule US 1918 1919 - Oct lastSun 2:00 0 S 37Rule US 1942 only - Feb 9 2:00 1:00 W # War 38Rule US 1945 only - Sep 30 2:00 0 S 39Rule US 1967 max - Oct lastSun 2:00 0 S 40Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 41Rule US 1974 only - Jan 6 2:00 1:00 D 42Rule US 1975 only - Feb 23 2:00 1:00 D 43Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 44Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 45 46# From Bob Devine (January 28, 1988): 47# ...Alaska (and Hawaii) had the timezone names changed in 1967. 48# old new 49# Pacific Standard Time(PST) -same- 50# Yukon Standard Time(YST) -same- 51# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 52# Nome Standard Time (NT) Bering Standard Time (BST) 53# 54# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 55# The YST zone now covers nearly all of the state, AHST just part 56# of the Aleutian islands. No DST. 57 58# From U. S. Naval Observatory (January 19, 1989): 59# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 60# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 61# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 62# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 63# USA MOUNTAIN 7 H BEHIND UTC DENVER 64# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 65# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 66# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 67# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 68# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 69# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 70# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 71# USA HAWAII 10 H BEHIND UTC 72# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 73 74# From Arthur David Olson (January 21, 1989): 75# The above dates are for 1988. 76# Note the "AKST" and "AKDT" abbreviations, the claim that there's 77# no DST in Samoa, and the claim that there is DST in Alaska and the 78# Aleutians. 79 80# From Arthur David Olson (February 13, 1988): 81# Legal standard time zone names, from United States Code (1982 Edition and 82# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 83# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 84# took effect), as explained in sections 263 and 261: 85# (none) 86# United States standard eastern time 87# United States standard mountain time 88# United States standard central time 89# United States standard Pacific time 90# (none) 91# United States standard Alaska time 92# (none) 93# Next, names from April 1, 1967 until November 30, 1983 (the date for 94# public law 98-181): 95# Atlantic standard time 96# eastern standard time 97# central standard time 98# mountain standard time 99# Pacific standard time 100# Yukon standard time 101# Alaska-Hawaii standard time 102# Bering standard time 103# And after November 30, 1983: 104# Atlantic standard time 105# eastern standard time 106# central standard time 107# mountain standard time 108# Pacific standard time 109# Alaska standard time 110# Hawaii-Aleutian standard time 111# Samoa standard time 112# The law doesn't give abbreviations. 113 114# From Paul Eggert <eggert@twinsun.com> (August 16, 1994): 115# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 116# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 117# from Russia. We don't have this data pinned down yet, though. 118 119# Easy stuff first--including Alaska, where we ignore history (since we 120# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" 121# times). 122 123# Zone NAME GMTOFF RULES FORMAT [UNTIL] 124Zone America/New_York -5:00 US E%sT 125Zone America/Chicago -6:00 US C%sT 126Zone America/Denver -7:00 US M%sT 127Zone America/Los_Angeles -8:00 US P%sT 128Zone America/Anchorage -9:00 US AK%sT 129 # AK%sT is the abbreviation per USNO 130 131# Mainland US areas that are always Standard as of 1986. 132 133Zone America/Fort_Wayne -5:00 US E%sT 1946 134 -5:00 - EST # Always EST as of 1986 135# From Arthur David Olson (October 28, 1991): 136# An article on page A3 of the Sunday, October 27, 1991 Washington Post 137# notes that Starke County switched from Central time to Eastern time as of 138# October 27, 1991. 139Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 140 -5:00 - EST # Always EST as of 1991 141Zone America/Phoenix -7:00 US M%sT 1946 142 -7:00 - MST # Always MST as of 1986 143 144# From Arthur David Olson (February 13, 1988): 145# However. . .a writer from the Inter Tribal Council of Arizona, Inc., 146# notes in private correspondence dated 12/28/87 that "Presently, only the 147# Navajo Nation participates in the Daylight Saving Time policy, due to its 148# large size and location in three states." (The "only" means that other 149# tribal nations don't use DST.) 150 151Link America/Denver Navajo 152 153# From Bob Devine (January 28, 1988): 154# Michigan didn't observe DST from 1968 to 1973. 155 156Zone America/Detroit -5:00 US E%sT 1968 157 -5:00 - EST 1973 158 -5:00 US E%sT 159 160# Samoa just changes names. No DST, per Naval Observatory. 161# 162# Howse writes that in 1879 the King of Samoa decided to change 163# ``the date in his kingdom from the Antipodean to the American system, 164# ordaining -- by a masterpiece of diplomatic flattery -- that 165# the Fourth of July should be celebrated twice in that year.'' 166 167Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5 168 -11:22:48 - LMT 1911 169 -11:30 - SST 1950 170 -11:00 - NST 1967 Apr # N=Nome 171 -11:00 - BST 1983 Nov 30 # B=Bering 172 -11:00 - SST # S=Samoa 173 174Zone Pacific/Midway -11:49:28 - LMT 1901 175 -11:00 - NST 1967 Apr # N=Nome 176 -11:00 - BST 1983 Nov 30 # B=Bering 177 -11:00 - SST # S=Samoa 178 179# Aleutian has a name change. DST, per Naval Observatory. 180 181Zone America/Atka -10:00 US AH%sT 1983 Nov 30 182 -10:00 US HA%sT 183 184# From Arthur David Olson: 185# And then there's Hawaii. 186# DST was observed for one day in 1933; 187# Standard time was change by half an hour in 1947; 188# it's always standard as of 1986. 189 190Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 191 -10:30 1:00 HDT 1933 May 1 2:00 192 -10:30 US H%sT 1947 Jun 8 2:00 193 -10:00 - HST 194 195# Navassa 196# no information; probably like US/Eastern 197 198 199# Old names, for S5 users 200 201# Link LINK-FROM LINK-TO 202Link America/New_York EST5EDT 203Link America/Chicago CST6CDT 204Link America/Denver MST7MDT 205Link America/Los_Angeles PST8PDT 206Link America/Fort_Wayne EST 207Link America/Phoenix MST 208Link Pacific/Honolulu HST 209 210################################################################################ 211 212 213# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 214# A good source for time zone historical data outside the U.S. is 215# Thomas G. Shanks, The International Atlas (3rd edition), 216# San Diego: ACS Publications, Inc. (1991). 217# Except where otherwise noted, it is the source for the data below. 218# 219# Another source occasionally used is Edward W. Whitman, World Time Differences, 220# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 221# I found in the UCLA library. 222# 223# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 224# Corrections are welcome! 225# 226# See the `africa' file for Zone naming conventions. 227 228 229 230# Canada 231 232# Canada is reportedly lots easier than the US--leastways since 1951. 233# I don't know what they did before then. 234# 4.3BSD claims that it's perfectly regular. 235# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 236# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 237# "...Canada (well, Ontario and at least some of the other provinces) are 238# adopting the new daylight savings time rules...". We assume all of 239# Canada is doing so. 240 241# From Bob Devine (January 28, 1988): 242# All of Canada did have DST from your first rule except Saskatchewan. 243# Which parts did not observe DST is hard to pinpoint but most of the 244# province follows the rules. 245# NOTE: those that didn't have DST for that rule, also 246# probably did not have it for several years previous. 247 248# From U. S. Naval Observatory (January 19, 1989): 249# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 250# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 251# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 252# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 253# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 254# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 255# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 256# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 257# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 258# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 259# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 260# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 261# CANADA YUKON SAME AS PACIFIC DAWSON 262 263# From Arthur David Olson (January 21, 1989): 264# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 265# Note claim that there's double DST in Newfoundland and that Yukon should 266# be same as Pacific. 267 268# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 269# The. . .below is based on information I got from our law library, the 270# provincial archives, and the provincial Community Services department. 271# A precise history would require digging through newspaper archives, and 272# since you didn't say what you wanted, I didn't bother. 273# 274# Saskatchewan is split by a time zone meridian (105W) and over the years 275# the boundary became pretty ragged as communities near it reevaluated 276# their affiliations in one direction or the other. In 1965 a provincial 277# referendum favoured legislating common time practices. 278# 279# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 280# Saskatchewan 1978) was proclaimed, and established that the eastern 281# part of Saskatchewan would use CST year round, that districts in 282# northwest Saskatchewan would by default follow CST but could opt to 283# follow Mountain Time rules (thus 1 hour difference in the winter and 284# zero in the summer), and that districts in southwest Saskatchewan would 285# by default follow MT but could opt to follow CST. 286# 287# It took a few years for the dust to settle (I know one story of a town 288# on one time zone having its school in another, such that a mom had to 289# serve her family lunch in two shifts), but presently it seems that only 290# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 291# rules any more; all other districts appear to have used CST year round 292# since sometime in the 1960s. 293# 294# Here's how I would summarize things. Establish a "Saskatchewan" CST 295# time zone, and note that it officially exists as of 15 April 1966. Any 296# current exceptions can put themselves in the "Mountain" zone, since 297# those are the rules they follow. Any past exceptions can be forgotten, 298# since that's what those who live here have done. 299 300# From Arthur David Olson (November 21, 1992): 301# East-Saskatchewan kept to avoid problems for folks using that zone by name; 302# plain Saskatchewan added. 303 304 305# From Shanks (1991): 306# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 307Rule StJohns 1884 only - Jan 1 0:00 0 S 308Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 309Rule StJohns 1917 only - Sep 17 2:00 0 S 310Rule StJohns 1918 only - Oct 31 2:00 0 S 311# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 312Rule StJohns 1919 only - May 5 23:00 1:00 D 313Rule StJohns 1919 only - Aug 12 23:00 0 S 314# For 1931-1935 Whitman gives Apr same date; go with Shanks. 315Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 316Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 317# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 318Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 319Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 320# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 321Rule StJohns 1942 only - Mar 1 0:00 1:00 D 322Rule StJohns 1942 only - Dec 31 0:00 0 S 323Rule StJohns 1943 only - May 30 0:00 1:00 D 324Rule StJohns 1943 only - Sep 5 0:00 0 S 325Rule StJohns 1944 only - Jul 10 0:00 1:00 D 326Rule StJohns 1944 only - Sep 2 0:00 0 S 327Rule StJohns 1945 only - Jan 1 0:00 1:00 D 328Rule StJohns 1945 only - Oct 7 2:00 0 S 329# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 330# Apr 30 - Sep 24; go with Shanks. 331Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 332Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 333Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 334Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 335Rule StJohns 1960 max - Oct lastSun 2:00 0 S 336Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 337Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D 338Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 339# St John's has an apostrophe, but Posix file names can't have apostrophes. 340# Zone NAME GMTOFF RULES FORMAT [UNTIL] 341Zone America/St_Johns -3:30:52 - LMT 1884 342 -3:31 StJohns N%sT 1935 Mar 30 343 -3:30 StJohns N%sT 344 345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 346Rule Halifax 1902 only - Jun 15 0:00 0 S 347Rule Halifax 1916 only - Apr 1 0:00 1:00 D 348Rule Halifax 1916 only - Oct 1 0:00 0 S 349Rule Halifax 1918 only - Apr 14 2:00 1:00 D 350Rule Halifax 1918 only - Oct 31 2:00 0 S 351Rule Halifax 1920 only - May 9 0:00 1:00 D 352Rule Halifax 1920 only - Aug 29 0:00 0 S 353Rule Halifax 1921 only - May 6 0:00 1:00 D 354Rule Halifax 1921 1922 - Sep 5 0:00 0 S 355Rule Halifax 1922 only - Apr 30 0:00 1:00 D 356Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 357Rule Halifax 1923 only - Sep 4 0:00 0 S 358Rule Halifax 1924 only - Sep 15 0:00 0 S 359Rule Halifax 1925 only - Sep 28 0:00 0 S 360Rule Halifax 1926 only - May 16 0:00 1:00 D 361Rule Halifax 1926 only - Sep 13 0:00 0 S 362Rule Halifax 1927 only - May 1 0:00 1:00 D 363Rule Halifax 1927 only - Sep 26 0:00 0 S 364Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 365Rule Halifax 1928 only - Sep 9 0:00 0 S 366Rule Halifax 1929 only - Sep 3 0:00 0 S 367Rule Halifax 1930 only - Sep 15 0:00 0 S 368Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 369Rule Halifax 1933 only - Apr 30 0:00 1:00 D 370Rule Halifax 1933 only - Oct 2 0:00 0 S 371Rule Halifax 1934 only - May 20 0:00 1:00 D 372Rule Halifax 1934 only - Sep 16 0:00 0 S 373Rule Halifax 1935 only - Jun 2 0:00 1:00 D 374Rule Halifax 1935 only - Sep 30 0:00 0 S 375Rule Halifax 1936 only - Jun 1 0:00 1:00 D 376Rule Halifax 1936 only - Sep 14 0:00 0 S 377Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 378Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 379Rule Halifax 1939 only - May 28 0:00 1:00 D 380Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 381Rule Halifax 1942 only - Feb 9 2:00 1:00 D 382Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 383Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 384Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 385Rule Halifax 1962 max - Oct lastSun 2:00 0 S 386Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 387# Zone NAME GMTOFF RULES FORMAT [UNTIL] 388Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 389 -4:00 Halifax A%sT 390 391# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 392Rule Mont 1884 only - Jan 1 0:00 0 S 393Rule Mont 1917 only - Mar 25 2:00 1:00 D 394Rule Mont 1917 only - Apr 24 0:00 0 S 395Rule Mont 1918 only - Apr 14 2:00 1:00 D 396Rule Mont 1918 only - Oct 31 2:00 0 S 397Rule Mont 1919 only - Mar 31 2:30 1:00 D 398Rule Mont 1919 only - Oct 25 2:30 0 S 399Rule Mont 1920 only - May 2 2:30 1:00 D 400Rule Mont 1920 only - Oct 3 2:30 0 S 401Rule Mont 1921 only - May 1 2:00 1:00 D 402Rule Mont 1921 only - Oct 2 2:30 0 S 403Rule Mont 1922 only - Apr 30 2:00 1:00 D 404Rule Mont 1922 only - Oct 1 2:30 0 S 405Rule Mont 1924 only - May 17 2:00 1:00 D 406Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 407Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 408Rule Mont 1927 only - May 1 0:00 1:00 D 409Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 410Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 411Rule Mont 1932 only - May 1 0:00 1:00 D 412Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 413Rule Mont 1933 only - Oct 1 0:00 0 S 414Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 415Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 416Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 417Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 418Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 419Rule Mont 1957 max - Oct lastSun 2:00 0 S 420Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 421# Zone NAME GMTOFF RULES FORMAT [UNTIL] 422Zone America/Montreal -4:54:16 - LMT 1884 423 -5:00 Mont E%sT 424 425# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 426Rule Winn 1887 only - Jul 16 0:00 0 S 427Rule Winn 1916 only - Apr 23 0:00 1:00 D 428Rule Winn 1916 only - Sep 17 0:00 0 S 429Rule Winn 1918 only - Apr 14 2:00 1:00 D 430Rule Winn 1918 only - Oct 31 2:00 0 S 431Rule Winn 1937 only - May 16 2:00 1:00 D 432Rule Winn 1937 only - Sep 23 2:00 0 S 433Rule Winn 1942 only - Feb 9 2:00 1:00 D 434Rule Winn 1945 only - Sep lastSun 2:00 0 S 435Rule Winn 1946 only - May 12 2:00 1:00 D 436Rule Winn 1946 only - Oct 13 2:00 0 S 437Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 438Rule Winn 1947 1958 - Sep lastSun 2:00 0 S 439Rule Winn 1948 only - May 1 2:00 1:00 D 440Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D 441Rule Winn 1959 only - Oct lastSun 2:00 0 S 442Rule Winn 1960 only - Sep lastSun 2:00 0 S 443Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 444Rule Winn 1963 only - Sep lastSun 2:00 0 S 445Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 446Rule Winn 1966 max - Sep lastSun 2:00 0 S 447Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 448# Zone NAME GMTOFF RULES FORMAT [UNTIL] 449Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 450 -6:00 Winn C%sT 451 452# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 453Rule Regina 1905 only - Sep 1 0:00 0 S 454Rule Regina 1918 only - Apr 14 2:00 1:00 D 455Rule Regina 1918 only - Oct 31 2:00 0 S 456Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 457Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 458Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 459Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 460Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 461Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 462Rule Regina 1942 only - Feb 9 2:00 1:00 D 463Rule Regina 1945 only - Sep lastSun 2:00 0 S 464Rule Regina 1946 only - Apr 14 2:00 1:00 D 465Rule Regina 1946 only - Oct 13 2:00 0 S 466Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 467Rule Regina 1947 1959 - Sep lastSun 2:00 0 S 468# Zone NAME GMTOFF RULES FORMAT [UNTIL] 469Zone America/Regina -6:58:36 - LMT 1905 Sep 470 -7:00 Regina M%sT 1966 Apr 15 471 -6:00 - CST 472 473# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 474Rule Edm 1906 only - Sep 1 0:00 0 S 475Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 476Rule Edm 1918 only - Oct 31 2:00 0 S 477Rule Edm 1919 only - May 27 2:00 0 S 478Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 479Rule Edm 1920 only - Oct lastSun 2:00 0 S 480Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 481Rule Edm 1942 only - Feb 9 2:00 1:00 D 482Rule Edm 1945 only - Sep lastSun 2:00 0 S 483Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 484Rule Edm 1947 only - Sep lastSun 2:00 0 S 485Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 486Rule Edm 1967 only - Oct lastSun 2:00 0 S 487Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 488Rule Edm 1969 only - Oct lastSun 2:00 0 S 489Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 490Rule Edm 1972 max - Oct lastSun 2:00 0 S 491Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 492# Zone NAME GMTOFF RULES FORMAT [UNTIL] 493Zone America/Edmonton -7:33:52 - LMT 1906 Sep 494 -7:00 Edm M%sT 495 496# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 497Rule Vanc 1884 only - Jan 1 0:00 0 S 498Rule Vanc 1918 only - Apr 14 2:00 1:00 D 499Rule Vanc 1918 only - Oct 31 2:00 0 S 500Rule Vanc 1942 only - Feb 9 2:00 1:00 D 501Rule Vanc 1945 only - Sep 30 2:00 0 S 502Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 503Rule Vanc 1946 only - Oct 13 2:00 0 S 504Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 505Rule Vanc 1962 max - Oct lastSun 2:00 0 S 506Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 507# Zone NAME GMTOFF RULES FORMAT [UNTIL] 508Zone America/Vancouver -8:12:28 - LMT 1884 509 -8:00 Vanc P%sT 510 511# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 512Rule Yukon 1900 only - Jan 1 0:00 0 S 513Rule Yukon 1918 only - Apr 14 2:00 1:00 D 514Rule Yukon 1918 only - Oct 27 2:00 0 S 515Rule Yukon 1919 only - May 25 2:00 1:00 D 516Rule Yukon 1919 only - Nov 1 0:00 0 S 517Rule Yukon 1942 only - Feb 9 2:00 1:00 D 518Rule Yukon 1965 only - Apr 25 0:00 1:00 D 519Rule Yukon 1965 only - Oct 31 2:00 0 S 520Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 521Rule Yukon 1980 max - Oct lastSun 2:00 0 S 522Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 523# Zone NAME GMTOFF RULES FORMAT [UNTIL] 524Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 525 -9:00 Yukon Y%sT 1966 Jul 526 -8:00 Yukon P%sT 527# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 528 529############################################################################### 530 531# Mexico 532 533# From Guy Harris: 534# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 535# Rules prior to 1987 are unknown. 536# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 537# observe DST." This is presumably Baja California Norte, above 28th parallel, 538# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific 539# Coast (States of Sinaloa and Sonora)." 540 541# From Bob Devine (January 28, 1988): 542# The Federal District (where Mexico City is) has observed [DST] several 543# times but not recently. 544# 545# I don't where to drawn the line in the North Baja area. 28th latitude 546# sounds good -- but it may be higher (how far [d]o radio stations from 547# San Diego affect culture?). 548# 549# The dates of DST probably go back to 1981. The rules are the same as 550# US's. This is going to be a headache for US presidential electi[o]n years! 551 552# From Arthur David Olson (February 13, 1988) 553# Since the 1981 starting date is only "probable," we'll keep the 1987 554# starting date below. 555 556# From U. S. Naval Observatory (January 19, 1989): 557# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 558# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 559# MEXICO BAJA CAL N OF SINALOA AND SONORA) 560# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 561# MEXICO BAJA CAL N - OCT 29 562# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 563# MEXICO BAJA CAL N - 0CT 29 564# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 565# MEXICO COAHUILA, NUEVO LEON, 566# MEXICO TAMAULIPAS 567# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 568# MEXICO COAHUILA, NUEVO LEON, 569# MEXICO TAMAULIPAS APR 3 - OCT 29 570# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 571# MEXICO CAMPECHE, QUINTANA ROO AND 572# MEXICO YUCATAN 573 574# From Arthur David Olson (January 21, 1989): 575# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 576# USNO claims there should be four Mexican zones rather than three: 577# a zone that's GMT-8 with DST; a zone that's always GMT-7; 578# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 579 580# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 581# Shanks also says there are four zones, but disagrees about the fourth. 582# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 583 584# From Shanks (1991): 585# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 586Rule Mexico 1922 only - Jan 1 0:00 0 S 587Rule Mexico 1939 only - Feb 5 0:00 1:00 D 588Rule Mexico 1939 only - Jun 25 0:00 0 S 589Rule Mexico 1940 only - Dec 9 0:00 1:00 D 590Rule Mexico 1941 only - Apr 1 0:00 0 S 591Rule Mexico 1943 only - Dec 16 0:00 1:00 D 592Rule Mexico 1944 only - May 1 0:00 0 S 593Rule Mexico 1950 only - Feb 12 0:00 1:00 D 594Rule Mexico 1950 only - Jul 30 0:00 0 S 595Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 596Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S 597Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S 598# Zone NAME GMTOFF RULES FORMAT [UNTIL] 599Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 600 -7:00 - MST 1927 Jun 10 23:00 601 -6:00 - CST 1930 Nov 15 602 -7:00 - MST 1931 May 1 23:00 603 -6:00 - CST 1931 Oct 604 -7:00 - MST 1932 Mar 30 23:00 605 -6:00 Mexico C%sT 606Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 607 -7:00 - MST 1927 Jun 10 23:00 608 -6:00 - CST 1930 Nov 15 609 -7:00 - MST 1931 May 1 23:00 610 -6:00 - CST 1931 Oct 611 -7:00 - MST 1932 Mar 30 23:00 612 -6:00 - CST 1942 Apr 613 -7:00 - MST 1949 Jan 14 614 -8:00 - PST 1970 615 -7:00 - MST 616Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 617 -8:00 - PST 1927 Jun 10 23:00 618 -7:00 - MST 1930 Nov 16 619 -8:00 - PST 1942 Apr 620 -7:00 - MST 1949 Jan 14 621 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 622 -8:00 US P%sT 623Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 624 -8:00 - PST 1927 Jun 10 23:00 625 -7:00 - MST 1930 Nov 16 626 -8:00 - PST 1942 Apr 627 -7:00 - MST 1949 Jan 14 628 -8:00 - PST 629# 630# Revillagigedo Is 631# no information 632 633############################################################################### 634 635# Anguilla 636# Zone NAME GMTOFF RULES FORMAT [UNTIL] 637Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 638 -4:00 - AST 639 640# Antigua and Barbuda 641# Zone NAME GMTOFF RULES FORMAT [UNTIL] 642Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 643 -5:00 - EST 1951 644 -4:00 - AST 645 646# Bahamas 647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 648Rule Bahamas 1912 only - Mar 2 0:00 0 S 649Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 650Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 651Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 652# Zone NAME GMTOFF RULES FORMAT [UNTIL] 653Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 654 -5:00 Bahamas E%sT 655 656# Barbados 657# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 658Rule Barb 1932 only - Jan 1 0:00 0 S 659Rule Barb 1977 only - Jun 12 2:00 1:00 D 660Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 661Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 662Rule Barb 1979 only - Sep 30 2:00 0 S 663Rule Barb 1980 only - Sep 25 2:00 0 S 664# Zone NAME GMTOFF RULES FORMAT [UNTIL] 665Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 666 -3:58 - BMT 1932 # Bridgetown Mean Time 667 -4:00 Barb A%sT 668 669# Belize 670# Whitman entirely disagrees with Shanks; go with Shanks. 671# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 672Rule Belize 1912 only - Apr 1 0:00 0 S 673Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 674Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 675Rule Belize 1973 only - Dec 5 0:00 1:00 D 676Rule Belize 1974 only - Feb 9 0:00 0 S 677Rule Belize 1982 only - Dec 18 0:00 1:00 D 678Rule Belize 1983 only - Feb 12 0:00 0 S 679# Zone NAME GMTOFF RULES FORMAT [UNTIL] 680Zone America/Belize -5:52:48 - LMT 1912 Apr 681 -6:00 Belize C%sT 682 683# Bermuda 684# Zone NAME GMTOFF RULES FORMAT [UNTIL] 685Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 686 -4:00 - AST 1974 Apr 28 2:00 687 -4:00 Bahamas A%sT 688 689# Cayman Is 690# Zone NAME GMTOFF RULES FORMAT [UNTIL] 691Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 692 -5:07 - KMT 1912 Feb # Kingston Mean Time 693 -5:00 - EST 694 695# Clipperton 696# no information 697 698# Costa Rica 699# Shanks gives some very odd dates for 1991, and stops there. 700# For now, we won't guess further. 701# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 702Rule CR 1921 only - Jan 15 0:00 0 S 703Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 704Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 705Rule CR 1991 only - Jan 19 0:00 1:00 D 706Rule CR 1991 only - Jul 1 0:00 0 S 707# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 708# Zone NAME GMTOFF RULES FORMAT [UNTIL] 709Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 710 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 711 -6:00 CR C%sT 712# Coco 713# no information; probably like America/Costa_Rica 714 715# Cuba 716 717# From Bob Devine (January 28, 1988): 718# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 719# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 720# (I think). 721 722# From U. S. Naval Observatory (January 19, 1989): 723# CUBA 5 H BEHIND UTC 724# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 725 726# From Shanks (1991): 727# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 728Rule Cuba 1925 only - Jul 19 12:00 0 S 729Rule Cuba 1928 only - Jun 10 0:00 1:00 D 730Rule Cuba 1928 only - Oct 10 0:00 0 S 731Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 732Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 733Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 734Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 735Rule Cuba 1965 only - Jun 1 0:00 1:00 D 736Rule Cuba 1965 only - Sep 30 0:00 0 S 737Rule Cuba 1966 only - May 29 0:00 1:00 D 738Rule Cuba 1966 only - Oct 2 0:00 0 S 739Rule Cuba 1967 only - Apr 8 0:00 1:00 D 740Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 741Rule Cuba 1968 only - Apr 14 0:00 1:00 D 742Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 743Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 744Rule Cuba 1972 1974 - Oct 8 0:00 0 S 745Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 746Rule Cuba 1978 only - May 7 0:00 1:00 D 747Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 748Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 749Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 750Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S 751Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 752Rule Cuba 1990 only - Apr 1 0:00 1:00 D 753Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 754 755# Zone NAME GMTOFF RULES FORMAT [UNTIL] 756Zone America/Havana -5:29:28 - LMT 1890 757 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 758 -5:00 Cuba C%sT 759 760# Dominica 761# Zone NAME GMTOFF RULES FORMAT [UNTIL] 762Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 763 -4:00 - AST 764 765# Dominican Republic 766# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 767Rule DR 1933 only - Apr 1 12:00 0 S 768Rule DR 1966 only - Oct 30 0:00 1:00 D 769Rule DR 1967 only - Feb 28 0:00 0 S 770Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 771Rule DR 1970 only - Feb 21 0:00 0 S 772Rule DR 1971 only - Jan 20 0:00 0 S 773Rule DR 1972 1974 - Jan 21 0:00 0 S 774# Zone NAME GMTOFF RULES FORMAT [UNTIL] 775Zone America/Santo_Domingo -4:39:36 - LMT 1890 776 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 777 -5:00 DR E%sT 1974 Oct 27 778 -4:00 - AST 779 780# El Salvador 781# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 782Rule Salv 1921 only - Jan 1 0:00 0 S 783Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 784Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 785# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 786# Zone NAME GMTOFF RULES FORMAT [UNTIL] 787Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 788 -6:00 Salv C%sT 789 790# Grenada 791# Zone NAME GMTOFF RULES FORMAT [UNTIL] 792Zone America/Grenada -4:07:00 - LMT 1911 Jul 793 -4:00 - AST 794 795# Guadeloupe 796# Zone NAME GMTOFF RULES FORMAT [UNTIL] 797Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 798 -4:00 - AST 799 800# Guatemala 801# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 802Rule Guat 1918 only - Oct 5 0:00 0 S 803Rule Guat 1973 only - Nov 25 0:00 1:00 D 804Rule Guat 1974 only - Feb 24 0:00 0 S 805Rule Guat 1983 only - May 21 0:00 1:00 D 806Rule Guat 1983 only - Sep 22 0:00 0 S 807# Zone NAME GMTOFF RULES FORMAT [UNTIL] 808Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 809 -6:00 Guat C%sT 810 811# Haiti 812# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 813Rule Haiti 1917 only - Jan 24 12:00 0 S 814Rule Haiti 1983 only - May 8 0:00 1:00 D 815Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 816Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 817Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 818Rule Haiti 1988 max - Oct lastSun 2:00 0 S 819# Zone NAME GMTOFF RULES FORMAT [UNTIL] 820Zone America/Port-au-Prince -4:49:20 - LMT 1890 821 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 822 -5:00 Haiti E%sT 823 824# Honduras 825# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 826# Zone NAME GMTOFF RULES FORMAT [UNTIL] 827Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 828 -6:00 Salv C%sT 829 830# Jamaica 831 832# From Bob Devine (January 28, 1988): 833# Follows US rules. 834 835# From U. S. Naval Observatory (January 19, 1989): 836# JAMAICA 5 H BEHIND UTC 837 838# From Shanks (1991): 839# Zone NAME GMTOFF RULES FORMAT [UNTIL] 840Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 841 -5:07 - KMT 1912 Feb # Kingston Mean Time 842 -5:00 - EST 1974 Jan 6 2:00 843 -5:00 US E%sT 844 845# Martinique 846# Zone NAME GMTOFF RULES FORMAT [UNTIL] 847Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 848 -4:04 - FFMT 1911 May # Fort-de-France MT 849 -4:00 - AST 1980 Apr 6 850 -4:00 1:00 ADT 1980 Sep 28 851 -4:00 - AST 852 853# Montserrat 854# Zone NAME GMTOFF RULES FORMAT [UNTIL] 855Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 856 -4:00 - AST 857 858# Nicaragua 859# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 860Rule Nic 1975 only - Feb 16 0:00 0 S 861Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 862Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 863# Zone NAME GMTOFF RULES FORMAT [UNTIL] 864Zone America/Managua -5:45:08 - LMT 1890 865 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 866 -6:00 - CST 1973 May 867 -5:00 - EST 1975 Feb 16 868 -6:00 Nic C%sT 869 870# Panama 871# Zone NAME GMTOFF RULES FORMAT [UNTIL] 872Zone America/Panama -5:18:08 - LMT 1890 873 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 874 -5:00 - EST 875 876# Puerto Rico 877# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 878# Zone NAME GMTOFF RULES FORMAT [UNTIL] 879Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan 880 -4:00 - AST 1942 May 3 881 -4:00 1:00 ADT 1945 Sep 30 2:00 882 -4:00 - AST 883 884# St Kitts-Nevis 885# Zone NAME GMTOFF RULES FORMAT [UNTIL] 886Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 887 -4:00 - AST 888 889# St Lucia 890# Zone NAME GMTOFF RULES FORMAT [UNTIL] 891Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 892 -4:04 - CMT 1912 # Castries Mean Time 893 -4:00 - AST 894 895# St Pierre and Miquelon 896# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 897# Zone NAME GMTOFF RULES FORMAT [UNTIL] 898Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 899 -4:00 - AST 1980 May 900 -3:00 Mont SP%sT 901 902# St Vincent and the Grenadines 903# Zone NAME GMTOFF RULES FORMAT [UNTIL] 904Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 905 -4:05 - KMT 1912 # Kingstown Mean Time 906 -4:00 - AST 907 908# Turks and Caicos 909# Zone NAME GMTOFF RULES FORMAT [UNTIL] 910Zone America/Grand_Turk -4:44:32 - LMT 1890 911 -5:07 - KMT 1912 Feb # Kingston Mean Time 912 -5:00 - EST 1979 Apr 29 2:00 913 -5:00 US E%sT 914 915# Virgin Is (British and US) 916# Zone NAME GMTOFF RULES FORMAT [UNTIL] 917Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie 918 -4:00 - AST 919