1 # tzdb data for North and Central America and environs 2 3 # This file is in the public domain, so clarified as of 4 # 2009-05-17 by Arthur David Olson. 5 6 # also includes Central America and the Caribbean 7 8 # This file is by no means authoritative; if you think you know better, 9 # go ahead and edit the file (and please send any changes to 10 # tz@iana.org for general use in the future). For more, please see 11 # the file CONTRIBUTING in the tz distribution. 12 13 # From Paul Eggert (1999-03-22): 14 # A reliable and entertaining source about time zones is 15 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 16 17 ############################################################################### 18 19 # United States 20 21 # From Paul Eggert (1999-03-31): 22 # Howse writes (pp 121-125) that time zones were invented by 23 # Professor Charles Ferdinand Dowd (1825-1904), 24 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 25 # His pamphlet "A System of National Time for Railroads" (1870) 26 # was the result of his proposals at the Convention of Railroad Trunk Lines 27 # in New York City (1869-10). His 1870 proposal was based on Washington, DC, 28 # but in 1872-05 he moved the proposed origin to Greenwich. 29 30 # From Paul Eggert (2018-03-20): 31 # Dowd's proposal left many details unresolved, such as where to draw 32 # lines between time zones. The key individual who made time zones 33 # work in the US was William Frederick Allen - railway engineer, 34 # managing editor of the Travelers' Guide, and secretary of the 35 # General Time Convention, a railway standardization group. Allen 36 # spent months in dialogs with scientific and railway leaders, 37 # developed a workable plan to institute time zones, and presented it 38 # to the General Time Convention on 1883-04-11, saying that his plan 39 # meant "local time would be practically abolished" - a plus for 40 # railway scheduling. By the next convention on 1883-10-11 nearly all 41 # railroads had agreed and it took effect on 1883-11-18. That Sunday 42 # was called the "day of two noons", as some locations observed noon 43 # twice. Allen witnessed the transition in New York City, writing: 44 # 45 # I heard the bells of St. Paul's strike on the old time. Four 46 # minutes later, obedient to the electrical signal from the Naval 47 # Observatory ... the time-ball made its rapid descent, the chimes 48 # of old Trinity rang twelve measured strokes, and local time was 49 # abandoned, probably forever. 50 # 51 # Most of the US soon followed suit. See: 52 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 53 # https://dx.doi.org/10.2307/3105430 54 55 # From Paul Eggert (2005-04-16): 56 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 57 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 58 59 # From Paul Eggert (2006-03-22): 60 # A good source for time zone historical data in the US is 61 # Thomas G. Shanks, The American Atlas (5th edition), 62 # San Diego: ACS Publications, Inc. (1991). 63 # Make sure you have the errata sheet; the book is somewhat useless without it. 64 # It is the source for most of the pre-1991 US entries below. 65 66 # From Paul Eggert (2001-03-06): 67 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin 68 # in his whimsical essay "An Economical Project for Diminishing the Cost 69 # of Light" published in the Journal de Paris (1784-04-26). 70 # Not everyone is happy with the results: 71 # 72 # I don't really care how time is reckoned so long as there is some 73 # agreement about it, but I object to being told that I am saving 74 # daylight when my reason tells me that I am doing nothing of the kind. 75 # I even object to the implication that I am wasting something 76 # valuable if I stay in bed after the sun has risen. As an admirer 77 # of moonlight I resent the bossy insistence of those who want to 78 # reduce my time for enjoying it. At the back of the Daylight Saving 79 # scheme I detect the bony, blue-fingered hand of Puritanism, eager 80 # to push people into bed earlier, and get them up earlier, to make 81 # them healthy, wealthy and wise in spite of themselves. 82 # 83 # -- Robertson Davies, The diary of Samuel Marchbanks, 84 # Clarke, Irwin (1947), XIX, Sunday 85 # 86 # For more about the first ten years of DST in the United States, see 87 # Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 88 # (Carnegie Library of Pittsburgh, 1927). 89 # http://www.clpgh.org/exhibit/dst.html 90 # 91 # Shanks says that DST was called "War Time" in the US in 1918 and 1919. 92 # However, DST was imposed by the Standard Time Act of 1918, which 93 # was the first nationwide legal time standard, and apparently 94 # time was just called "Standard Time" or "Daylight Saving Time". 95 96 # From Arthur David Olson: 97 # US Daylight Saving Time ended on the last Sunday of *October* in 1974. 98 # See, for example, the front page of the Saturday, 1974-10-26 99 # and Sunday, 1974-10-27 editions of the Washington Post. 100 101 # From Arthur David Olson: 102 # Before the Uniform Time Act of 1966 took effect in 1967, observance of 103 # Daylight Saving Time in the US was by local option, except during wartime. 104 105 # From Arthur David Olson (2000-09-25): 106 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 107 # In the introduction, Oboler spoke of "Eastern Peace Time." 108 # An AltaVista search turned up: 109 # https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 110 # "When the time is announced over the radio now, it is 'Eastern Peace 111 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 112 # (August 1945) by way of confirmation. 113 # 114 # From Paul Eggert (2017-09-23): 115 # This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 116 117 # From Joseph Gallant citing 118 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 119 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 120 # to switch to London for Attlee's address, but the American people 121 # never got to hear his speech live. According to one press account, 122 # CBS' Bob Trout was first to announce the word of Japan's surrender, 123 # but a few seconds later, NBC, ABC and Mutual also flashed the word 124 # of surrender, all of whom interrupting the bells of Big Ben in 125 # London which were to precede Mr. Attlee's speech. 126 127 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 128 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 129 # 130 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 131 # Any announcement from Asia would reach St. John's New York newsroom on a 132 # wire service teletype machine, which had prescribed signals for major news. 133 # Associated Press, for example, would ring five bells before spewing out 134 # typed copy of an important story, and 10 bells for news "of transcendental 135 # importance." 136 # 137 # On Aug. 14, stalling while talking steadily into the NBC networks' open 138 # microphone, St. John heard five bells and waited only to hear a sixth bell, 139 # before announcing confidently: "Ladies and gentlemen, World War II is over. 140 # The Japanese have agreed to our surrender terms." 141 # 142 # He had scored a 20-second scoop on other broadcasters. 143 144 # From Arthur David Olson (2005-08-22): 145 # Paul has been careful to use the "US" rules only in those locations 146 # that are part of the United States; this reflects the real scope of 147 # U.S. government action. So even though the "US" rules have changed 148 # in the latest release, other countries won't be affected. 149 150 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 151 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 152 Rule US 1918 1919 - Oct lastSun 2:00 0 S 153 Rule US 1942 only - Feb 9 2:00 1:00 W # War 154 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 155 Rule US 1945 only - Sep lastSun 2:00 0 S 156 Rule US 1967 2006 - Oct lastSun 2:00 0 S 157 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 158 Rule US 1974 only - Jan 6 2:00 1:00 D 159 Rule US 1975 only - Feb 23 2:00 1:00 D 160 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 161 Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 162 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 163 Rule US 2007 max - Nov Sun>=1 2:00 0 S 164 165 # From Arthur David Olson, 2005-12-19 166 # We generate the files specified below to guard against old files with 167 # obsolete information being left in the time zone binary directory. 168 # We limit the list to names that have appeared in previous versions of 169 # this time zone package. 170 # We do these as separate Zones rather than as Links to avoid problems if 171 # a particular place changes whether it observes DST. 172 # We put these specifications here in the northamerica file both to 173 # increase the chances that they'll actually get compiled and to 174 # avoid the need to duplicate the US rules in another file. 175 176 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 177 Zone EST -5:00 - EST 178 Zone MST -7:00 - MST 179 Zone HST -10:00 - HST 180 Zone EST5EDT -5:00 US E%sT 181 Zone CST6CDT -6:00 US C%sT 182 Zone MST7MDT -7:00 US M%sT 183 Zone PST8PDT -8:00 US P%sT 184 185 # From U. S. Naval Observatory (1989-01-19): 186 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 187 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 188 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 189 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 190 # USA MOUNTAIN 7 H BEHIND UTC DENVER 191 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 192 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 193 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 194 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 195 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 196 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 197 # USA " 9 H BEHIND UTC APR 3 - OCT 30 198 # USA HAWAII 10 H BEHIND UTC 199 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 200 201 # From Arthur David Olson (1989-01-21): 202 # The above dates are for 1988. 203 # Note the "AKST" and "AKDT" abbreviations, the claim that there's 204 # no DST in Samoa, and the claim that there is DST in Alaska and the 205 # Aleutians. 206 207 # From Arthur David Olson (1988-02-13): 208 # Legal standard time zone names, from United States Code (1982 Edition and 209 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 210 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 211 # took effect), as explained in sections 263 and 261: 212 # (none) 213 # United States standard eastern time 214 # United States standard mountain time 215 # United States standard central time 216 # United States standard Pacific time 217 # (none) 218 # United States standard Alaska time 219 # (none) 220 # Next, names from 1967-04-01 until 1983-11-30 (the date for 221 # public law 98-181): 222 # Atlantic standard time 223 # eastern standard time 224 # central standard time 225 # mountain standard time 226 # Pacific standard time 227 # Yukon standard time 228 # Alaska-Hawaii standard time 229 # Bering standard time 230 # And after 1983-11-30: 231 # Atlantic standard time 232 # eastern standard time 233 # central standard time 234 # mountain standard time 235 # Pacific standard time 236 # Alaska standard time 237 # Hawaii-Aleutian standard time 238 # Samoa standard time 239 # The law doesn't give abbreviations. 240 # 241 # From Paul Eggert (2016-12-19): 242 # Here are URLs for the 1918 and 1966 legislation: 243 # http://uscode.house.gov/statviewer.htm?volume=40&page=451 244 # http://uscode.house.gov/statviewer.htm?volume=80&page=108 245 # Although the 1918 names were officially "United States Standard 246 # Eastern Time" and similarly for "Central", "Mountain", "Pacific", 247 # and "Alaska", in practice "Standard" was placed just before "Time", 248 # as codified in 1966. In practice, Alaska time was abbreviated "AST" 249 # before 1968. Summarizing the 1967 name changes: 250 # 1918 names 1967 names 251 # -08 Standard Pacific Time (PST) Pacific standard time (PST) 252 # -09 (unofficial) Yukon (YST) Yukon standard time (YST) 253 # -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 254 # -11 (unofficial) Nome (NST) Bering standard time (BST) 255 # 256 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 257 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" 258 # for time in Guam and the Northern Marianas. See the file "australasia". 259 # 260 # From Paul Eggert (2015-04-17): 261 # HST and HDT are standardized abbreviations for Hawaii-Aleutian 262 # standard and daylight times. See section 9.47 (p 234) of the 263 # U.S. Government Printing Office Style Manual (2008) 264 # https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 265 266 # From Arthur David Olson, 2005-08-09 267 # The following was signed into law on 2005-08-08. 268 # 269 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 270 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 271 # U.S.C. 260a(a)) is amended-- 272 # (1) by striking "first Sunday of April" and inserting "second 273 # Sunday of March"; and 274 # (2) by striking "last Sunday of October" and inserting "first 275 # Sunday of November'. 276 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the 277 # date of enactment of this Act or March 1, 2007, whichever is later. 278 # (c) Report to Congress.--Not later than 9 months after the effective 279 # date stated in subsection (b), the Secretary shall report to Congress 280 # on the impact of this section on energy consumption in the United 281 # States. 282 # (d) Right to Revert.--Congress retains the right to revert the 283 # Daylight Saving Time back to the 2005 time schedules once the 284 # Department study is complete. 285 286 # US eastern time, represented by New York 287 288 # Connecticut, Delaware, District of Columbia, most of Florida, 289 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 290 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 291 # New Hampshire, New Jersey, New York, North Carolina, Ohio, 292 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 293 # Vermont, Virginia, West Virginia 294 295 # From Dave Cantor (2004-11-02): 296 # Early this summer I had the occasion to visit the Mount Washington 297 # Observatory weather station atop (of course!) Mount Washington [, NH].... 298 # One of the staff members said that the station was on Eastern Standard Time 299 # and didn't change their clocks for Daylight Saving ... so that their 300 # reports will always have times which are 5 hours behind UTC. 301 302 # From Paul Eggert (2005-08-26): 303 # According to today's Huntsville Times 304 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 305 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City 306 # in Russell County, Lanett in Chambers County and some towns in Lee County, 307 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 308 # Roberts, city administrator in Phenix City. as saying "We are in the Central 309 # time zone, but we do go by the Eastern time zone because so many people work 310 # in Columbus." 311 # 312 # From Paul Eggert (2017-02-22): 313 # Four cities are involved. The two not mentioned above are Smiths Station 314 # and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 315 # because West Point Pepperell textile mills were in Alabama while the 316 # corporate office was in Georgia, and residents voted to keep Eastern 317 # time even after the mills closed. See: Kazek K. Did you know which 318 # Alabama towns are in a different time zone? al.com 2017-02-06. 319 # http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 320 321 # From Paul Eggert (2014-09-06): 322 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 323 # says that New York City Hall time was 3 minutes 58.4 seconds fast of 324 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the 325 # nearest second. 326 327 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 328 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 329 Rule NYC 1920 only - Oct lastSun 2:00 0 S 330 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 331 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 332 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 333 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 334 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 335 -5:00 US E%sT 1920 336 -5:00 NYC E%sT 1942 337 -5:00 US E%sT 1946 338 -5:00 NYC E%sT 1967 339 -5:00 US E%sT 340 341 # US central time, represented by Chicago 342 343 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 344 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 345 # Washington counties), Illinois, western Indiana 346 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 347 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 348 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 349 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 350 # western Tennessee, most of Texas, Wisconsin 351 352 # From Paul Eggert (2018-01-07): 353 # In 1869 the Chicago Astronomical Society contracted with the city to keep 354 # time. Though delayed by the Great Fire, by 1880 a wire ran from the 355 # Dearborn Observatory (on the University of Chicago campus) to City Hall, 356 # which then sent signals to police and fire stations. However, railroads got 357 # their time signals from the Allegheny Observatory, the Madison Observatory, 358 # the Ann Arbor Observatory, etc., so their clocks did not agree with each 359 # other or with the city's official time. The confusion took some years to 360 # clear up. See: 361 # Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 362 # http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 363 364 # From Larry M. Smith (2006-04-26) re Wisconsin: 365 # https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 366 # is currently enforced at the 01:00 time of change. Because the local 367 # "bar time" in the state corresponds to 02:00, a number of citations 368 # are issued for the "sale of class 'B' alcohol after prohibited 369 # hours" within the deviated hour of this change every year.... 370 # 371 # From Douglas R. Bomberg (2007-03-12): 372 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 373 # Statue 175 closer in synch with the US Congress' intent.... 374 # https://docs.legis.wisconsin.gov/2007/related/acts/3 375 376 # From an email administrator of the City of Fort Pierre, SD (2015-12-21): 377 # Fort Pierre is technically located in the Mountain time zone as is 378 # the rest of Stanley County. Most of Stanley County and Fort Pierre 379 # uses the Central time zone due to doing most of their business in 380 # Pierre so it simplifies schedules. I have lived in Stanley County 381 # all my life and it has been that way since I can remember. (43 years!) 382 # 383 # From Paul Eggert (2015-12-25): 384 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 385 386 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 387 Rule Chicago 1920 only - Jun 13 2:00 1:00 D 388 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 389 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 390 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 391 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 392 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 393 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 394 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 395 -6:00 US C%sT 1920 396 -6:00 Chicago C%sT 1936 Mar 1 2:00 397 -5:00 - EST 1936 Nov 15 2:00 398 -6:00 Chicago C%sT 1942 399 -6:00 US C%sT 1946 400 -6:00 Chicago C%sT 1967 401 -6:00 US C%sT 402 # Oliver County, ND switched from mountain to central time on 1992-10-25. 403 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 404 -7:00 US M%sT 1992 Oct 25 2:00 405 -6:00 US C%sT 406 # Morton County, ND, switched from mountain to central time on 407 # 2003-10-26, except for the area around Mandan which was already central time. 408 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 409 # Officially this switch also included part of Sioux County, and 410 # Jones, Mellette, and Todd Counties in South Dakota; 411 # but in practice these other counties were already observing central time. 412 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 413 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 414 -7:00 US M%sT 2003 Oct 26 2:00 415 -6:00 US C%sT 416 417 # From Josh Findley (2011-01-21): 418 # ...it appears that Mercer County, North Dakota, changed from the 419 # mountain time zone to the central time zone at the last transition from 420 # daylight-saving to standard time (on Nov. 7, 2010): 421 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 422 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 423 424 # From Andy Lipscomb (2011-01-24): 425 # ...according to the Census Bureau, the largest city is Beulah (although 426 # it's commonly referred to as Beulah-Hazen, with Hazen being the next 427 # largest city in Mercer County). Google Maps places Beulah's city hall 428 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". 429 430 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 431 -7:00 US M%sT 2010 Nov 7 2:00 432 -6:00 US C%sT 433 434 # US mountain time, represented by Denver 435 # 436 # Colorado, far western Kansas, Montana, western 437 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 438 # New Mexico, southwestern North Dakota, 439 # western South Dakota, far western Texas (El Paso County, Hudspeth County, 440 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 441 # 442 # From Paul Eggert (2018-10-25): 443 # On 1921-03-04 federal law placed all of Texas into the central time zone. 444 # However, El Paso ignored the law for decades and continued to observe 445 # mountain time, on the grounds that that's what they had always done 446 # and they weren't about to let the federal government tell them what to do. 447 # Eventually the federal government gave in and changed the law on 448 # 1970-04-10 to match what El Paso was actually doing. Although 449 # that's slightly after our 1970 cutoff, there is no need to create a 450 # separate zone for El Paso since they were ignoring the law anyway. See: 451 # Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 452 # El Paso Times. 2018-10-24 06:40 -06. 453 # https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 454 # 455 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 456 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 457 Rule Denver 1920 only - Oct lastSun 2:00 0 S 458 Rule Denver 1921 only - May 22 2:00 0 S 459 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 460 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 461 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 462 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 463 -7:00 US M%sT 1920 464 -7:00 Denver M%sT 1942 465 -7:00 US M%sT 1946 466 -7:00 Denver M%sT 1967 467 -7:00 US M%sT 468 469 # US Pacific time, represented by Los Angeles 470 # 471 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 472 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 473 # north of the Salmon River, and the towns of Burgdorf and Warren), 474 # Nevada (except West Wendover), Oregon (except the northern ¾ of 475 # Malheur county), and Washington 476 477 # From Paul Eggert (2016-08-20): 478 # In early February 1948, in response to California's electricity shortage, 479 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 480 # causing electric clocks to lose six minutes per day. (This did not change 481 # legal time, and is not part of the data here.) See: 482 # Ross SA. An energy crisis from the past: Northern California in 1948. 483 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 484 # 1973-11. https://escholarship.org/uc/item/8x22k30c 485 # 486 # In another measure to save electricity, DST was instituted from 1948-03-14 487 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 488 # the fallback transition earlier. See pages 3-4 of: 489 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 490 # 491 # In response: 492 # 493 # Governor Warren received a torrent of objecting mail, and it is not too much 494 # to speculate that the objections to Daylight Saving Time were one important 495 # factor in the defeat of the Dewey-Warren Presidential ticket in California. 496 # -- Ross, p 25 497 # 498 # On December 8 the governor exercised the option, setting the date to January 1 499 # (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 500 # 501 # Despite the controversy, in 1949 California voters approved Proposition 12, 502 # which established DST from April's last Sunday at 01:00 until September's 503 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 504 # the fall-back date to October's last Sunday. See: 505 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 506 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 507 # 508 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 509 Rule CA 1948 only - Mar 14 2:01 1:00 D 510 Rule CA 1949 only - Jan 1 2:00 0 S 511 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 512 Rule CA 1950 1961 - Sep lastSun 2:00 0 S 513 Rule CA 1962 1966 - Oct lastSun 2:00 0 S 514 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 515 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 516 -8:00 US P%sT 1946 517 -8:00 CA P%sT 1967 518 -8:00 US P%sT 519 520 # Alaska 521 # AK%sT is the modern abbreviation for -09 per USNO. 522 # 523 # From Paul Eggert (2017-06-15): 524 # Howse writes that Alaska switched from the Julian to the Gregorian calendar, 525 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 526 # On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 527 # Russian forts and fleet at Sitka fired salutes to mark the ceremony of 528 # formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 529 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 530 # Sitka workers did not change their calendars until Sunday, 1867-10-20, 531 # and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 532 # From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 533 # http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 534 # Include only the time zone part of this transition, ignoring the switch 535 # from Julian to Gregorian, since we can't represent the Julian calendar. 536 # 537 # As far as we know, of the locations mentioned below only Sitka was 538 # permanently inhabited in 1867 by anyone using either calendar. 539 # (Yakutat was colonized by the Russians in 1799, but the settlement was 540 # destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 541 # were unaware of the US acquisition of Alaska, much less of any calendar or 542 # time change. However, the Russian-influenced part of Alaska did observe 543 # Russian time, and it is more accurate to model this than to ignore it. 544 # The database format requires an exact transition time; use the Russian 545 # salute as a somewhat-arbitrary time for the formal transfer of control for 546 # all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 547 # local times of other Alaskan locations so that they change simultaneously. 548 549 # From Paul Eggert (2014-07-18): 550 # One opinion of the early-1980s turmoil in Alaska over time zones and 551 # daylight saving time appeared as graffiti on a Juneau airport wall: 552 # "Welcome to Juneau. Please turn your watch back to the 19th century." 553 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 554 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 555 # 556 # Steve Ferguson (2011-01-31) referred to the following source: 557 # Norris F. Keeping time in Alaska: national directives, local response. 558 # Alaska History 2001;16(1-2). 559 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 560 561 # From Arthur David Olson (2011-02-01): 562 # Here's database-relevant material from the 2001 "Alaska History" article: 563 # 564 # On September 20 [1979]...DOT...officials decreed that on April 27, 565 # 1980, Juneau and other nearby communities would move to Yukon Time. 566 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 567 # Pacific Time. 568 # 569 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 570 # Department's September 1979 decision. Juneau and other communities in 571 # northern Southeast reverted to Pacific Time on October 26. 572 # 573 # On October 28 [1983]...the Metlakatla Indian Community Council voted 574 # unanimously to keep the reservation on Pacific Time. 575 # 576 # According to DOT official Joanne Petrie, Indian reservations are not 577 # bound to follow time zones imposed by neighboring jurisdictions. 578 # 579 # (The last is consistent with how the database now handles the Navajo 580 # Nation.) 581 582 # From Arthur David Olson (2011-02-09): 583 # I just spoke by phone with a staff member at the Metlakatla Indian 584 # Community office (using contact information available at 585 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 586 # It's shortly after 1:00 here on the east coast of the United States; 587 # the staffer said it was shortly after 10:00 there. When I asked whether 588 # that meant they were on Pacific time, they said no - they were on their 589 # own time. I asked about daylight saving; they said it wasn't used. I 590 # did not inquire about practices in the past. 591 592 # From Arthur David Olson (2011-08-17): 593 # For lack of better information, assume that Metlakatla's 594 # abandonment of use of daylight saving resulted from the 1983 vote. 595 596 # From Steffen Thorsen (2015-11-09): 597 # It seems Metlakatla did go off PST on Sunday, November 1, changing 598 # their time to AKST and are going to follow Alaska's DST, switching 599 # between AKST and AKDT from now on.... 600 # https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 601 602 # From Ryan Stanley (2018-11-06): 603 # The Metlakatla community in Alaska has decided not to change its 604 # clock back an hour starting on November 4th, 2018 (day before yesterday). 605 # They will be gmtoff=-28800 year-round. 606 # https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 607 608 # From Paul Eggert (2018-12-16): 609 # In a 2018-12-11 special election, Metlakatla voted to go back to 610 # Alaska time (including daylight saving time) starting next year. 611 # https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 612 613 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 614 Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 615 -8:57:41 - LMT 1900 Aug 20 12:00 616 -8:00 - PST 1942 617 -8:00 US P%sT 1946 618 -8:00 - PST 1969 619 -8:00 US P%sT 1980 Apr 27 2:00 620 -9:00 US Y%sT 1980 Oct 26 2:00 621 -8:00 US P%sT 1983 Oct 30 2:00 622 -9:00 US Y%sT 1983 Nov 30 623 -9:00 US AK%sT 624 Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 625 -9:01:13 - LMT 1900 Aug 20 12:00 626 -8:00 - PST 1942 627 -8:00 US P%sT 1946 628 -8:00 - PST 1969 629 -8:00 US P%sT 1983 Oct 30 2:00 630 -9:00 US Y%sT 1983 Nov 30 631 -9:00 US AK%sT 632 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 633 -8:46:18 - LMT 1900 Aug 20 12:00 634 -8:00 - PST 1942 635 -8:00 US P%sT 1946 636 -8:00 - PST 1969 637 -8:00 US P%sT 1983 Oct 30 2:00 638 -8:00 - PST 2015 Nov 1 2:00 639 -9:00 US AK%sT 2018 Nov 4 2:00 640 -8:00 - PST 2019 Mar Sun>=8 3:00 641 -9:00 US AK%sT 642 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 643 -9:18:55 - LMT 1900 Aug 20 12:00 644 -9:00 - YST 1942 645 -9:00 US Y%sT 1946 646 -9:00 - YST 1969 647 -9:00 US Y%sT 1983 Nov 30 648 -9:00 US AK%sT 649 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 650 -9:59:36 - LMT 1900 Aug 20 12:00 651 -10:00 - AST 1942 652 -10:00 US A%sT 1967 Apr 653 -10:00 - AHST 1969 654 -10:00 US AH%sT 1983 Oct 30 2:00 655 -9:00 US Y%sT 1983 Nov 30 656 -9:00 US AK%sT 657 Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 658 -11:01:38 - LMT 1900 Aug 20 12:00 659 -11:00 - NST 1942 660 -11:00 US N%sT 1946 661 -11:00 - NST 1967 Apr 662 -11:00 - BST 1969 663 -11:00 US B%sT 1983 Oct 30 2:00 664 -9:00 US Y%sT 1983 Nov 30 665 -9:00 US AK%sT 666 Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 667 -11:46:38 - LMT 1900 Aug 20 12:00 668 -11:00 - NST 1942 669 -11:00 US N%sT 1946 670 -11:00 - NST 1967 Apr 671 -11:00 - BST 1969 672 -11:00 US B%sT 1983 Oct 30 2:00 673 -10:00 US AH%sT 1983 Nov 30 674 -10:00 US H%sT 675 # The following switches don't quite make our 1970 cutoff. 676 # 677 # Shanks writes that part of southwest Alaska (e.g. Aniak) 678 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 679 # and another part (e.g. Akiak) made the same switch five weeks later. 680 # 681 # From David Flater (2004-11-09): 682 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 683 # Historic Preservation Commission, provided this information, which 684 # suggests that Unalaska deviated from statutory time from early 1967 685 # possibly until 1983: 686 # 687 # Minutes of the Unalaska City Council Meeting, January 10, 1967: 688 # "Except for St. Paul and Akutan, Unalaska is the only important 689 # location not on Alaska Standard Time. The following resolution was 690 # made by William Robinson and seconded by Henry Swanson: Be it 691 # resolved that the City of Unalaska hereby goes to Alaska Standard 692 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 693 # January 14, Alaska Standard Time.) This resolution was passed with 694 # three votes for and one against." 695 696 # Hawaii 697 698 # From Arthur David Olson (2010-12-09): 699 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 700 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 701 # the article is available at 702 # https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 703 # and indicates that standard time was adopted effective noon, January 704 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 705 # saving for the period between the last Sunday of each April and the 706 # last Sunday of each September, but less than a month later repealed the 707 # act," (page 220), that year-round daylight saving time was in effect 708 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 709 # when clocks changed) and that clocks were changed by 30 minutes 710 # effective the second Sunday of June, 1947 (page 219, with no time of 711 # day given for when clocks changed). A footnote for the 1933 changes 712 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 713 # and Act 163 (approved 21 May 1933)." 714 715 # From Arthur David Olson (2011-01-19): 716 # The following is from "Laws of the Territory of Hawaii Passed by the 717 # Seventeenth Legislature: Regular Session 1933," available (as of 718 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act 719 # 90...At 2 o'clock ante meridian of the last Sunday in April of each 720 # year, the standard time of this Territory shall be advanced one 721 # hour...This Act shall take effect upon its approval. Approved this 26th 722 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 723 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 724 # hereby repealed...This Act shall take effect upon its approval, upon 725 # which date the standard time of this Territory shall be restored to 726 # that existing immediately prior to the taking effect of said Act 90. 727 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 728 # of the Territory of Hawaii." 729 # 730 # Note that 1933-05-21 was a Sunday. 731 # We're left to guess the time of day when Act 163 was approved; guess noon. 732 733 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 734 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 735 -10:30 - HST 1933 Apr 30 2:00 736 -10:30 1:00 HDT 1933 May 21 12:00 737 -10:30 US H%sT 1947 Jun 8 2:00 738 -10:00 - HST 739 740 # Now we turn to US areas that have diverged from the consensus since 1970. 741 742 # Arizona mostly uses MST. 743 744 # From Paul Eggert (2002-10-20): 745 # 746 # The information in the rest of this paragraph is derived from the 747 # Daylight Saving Time web page 748 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 749 # maintained by the Arizona State Library, Archives and Public Records. 750 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 751 # time, but by federal law railroads, airlines, bus lines, military 752 # personnel, and some engaged in interstate commerce continued to 753 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 754 # Gazette says that was the date the law changed, and that 04-01 was 755 # the date the state's clocks would change. In 1945 the State of 756 # Arizona used standard time all year, again with exceptions only as 757 # mandated by federal law. Arizona observed DST in 1967, but Arizona 758 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 759 # 760 # Shanks says the 1944 experiment came to an end on 1944-03-17. 761 # Go with the Arizona State Library instead. 762 763 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 764 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 765 -7:00 US M%sT 1944 Jan 1 0:01 766 -7:00 - MST 1944 Apr 1 0:01 767 -7:00 US M%sT 1944 Oct 1 0:01 768 -7:00 - MST 1967 769 -7:00 US M%sT 1968 Mar 21 770 -7:00 - MST 771 # From Arthur David Olson (1988-02-13): 772 # A writer from the Inter Tribal Council of Arizona, Inc., 773 # notes in private correspondence dated 1987-12-28 that "Presently, only the 774 # Navajo Nation participates in the Daylight Saving Time policy, due to its 775 # large size and location in three states." (The "only" means that other 776 # tribal nations don't use DST.) 777 # 778 # From Paul Eggert (2013-08-26): 779 # See America/Denver for a zone appropriate for the Navajo Nation. 780 781 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 782 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 783 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 784 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 785 # Teton, Twin Falls, Valley, Washington counties, and the southern 786 # quarter of Idaho county) and eastern Oregon (most of Malheur County) 787 # switched four weeks late in 1974. 788 # 789 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 790 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 791 -8:00 US P%sT 1923 May 13 2:00 792 -7:00 US M%sT 1974 793 -7:00 - MST 1974 Feb 3 2:00 794 -7:00 US M%sT 795 796 # Indiana 797 # 798 # For a map of Indiana's time zone regions, see: 799 # https://en.wikipedia.org/wiki/Time_in_Indiana 800 # 801 # From Paul Eggert (2018-11-30): 802 # A brief but entertaining history of time in Indiana describes a 1949 debate 803 # in the Indiana House where city legislators (who favored "fast time") 804 # tussled with farm legislators (who didn't) over a bill to outlaw DST: 805 # "Lacking enough votes, the city faction tries to filibuster until time runs 806 # out on the session at midnight, but rural champion Rep. Herbert Copeland, 807 # R-Madison, leans over the gallery railing and forces the official clock 808 # back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 809 # debate rages on into the night. The filibuster finally dies out and the 810 # bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 811 # it doesn't matter which side won. The law has no enforcement powers and 812 # is simply ignored by fast-time communities." 813 # How Indiana went from 'God's time' to split zones and daylight-saving. 814 # Indianapolis Star. 2018-11-27 14:58 -05. 815 # https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 816 # 817 # From Paul Eggert (2007-08-17): 818 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 819 # with the following exceptions: 820 # 821 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 822 # Vanderburgh, and Warrick counties have been like America/Chicago. 823 # 824 # - Dearborn and Ohio counties have been like America/New_York. 825 # 826 # - Clark, Floyd, and Harrison counties have been like 827 # America/Kentucky/Louisville. 828 # 829 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 830 # and Switzerland counties have their own time zone histories as noted below. 831 # 832 # Shanks partitioned Indiana into 345 regions, each with its own time history, 833 # and wrote "Even newspaper reports present contradictory information." 834 # Those Hoosiers! Such a flighty and changeable people! 835 # Fortunately, most of the complexity occurred before our cutoff date of 1970. 836 # 837 # Other than Indianapolis, the Indiana place names are so nondescript 838 # that they would be ambiguous if we left them at the 'America' level. 839 # So we reluctantly put them all in a subdirectory 'America/Indiana'. 840 841 # From Paul Eggert (2014-06-26): 842 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 843 # says "DOT is relocating the time zone boundary in Indiana to move Starke, 844 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 845 # Eastern Time Zone to the Central Time Zone.... The effective date of 846 # this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 847 # changeover date from standard time to Daylight Saving Time." 848 # Strictly speaking, this meant the affected counties changed their 849 # clocks twice that night, but this obviously was in error. The intent 850 # was that 01:59:59 EST be followed by 02:00:00 CDT. 851 852 # From Gwillim Law (2007-02-10): 853 # The Associated Press has been reporting that Pulaski County, Indiana is 854 # going to switch from Central to Eastern Time on March 11, 2007.... 855 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 856 857 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 858 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 859 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 860 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 861 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 862 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 863 -6:00 US C%sT 1920 864 -6:00 Indianapolis C%sT 1942 865 -6:00 US C%sT 1946 866 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 867 -5:00 - EST 1957 Sep 29 2:00 868 -6:00 - CST 1958 Apr 27 2:00 869 -5:00 - EST 1969 870 -5:00 US E%sT 1971 871 -5:00 - EST 2006 872 -5:00 US E%sT 873 # 874 # Eastern Crawford County, Indiana, left its clocks alone in 1974, 875 # as well as from 1976 through 2005. 876 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 877 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 878 Rule Marengo 1951 only - Sep lastSun 2:00 0 S 879 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 880 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 881 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 882 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 883 -6:00 US C%sT 1951 884 -6:00 Marengo C%sT 1961 Apr 30 2:00 885 -5:00 - EST 1969 886 -5:00 US E%sT 1974 Jan 6 2:00 887 -6:00 1:00 CDT 1974 Oct 27 2:00 888 -5:00 US E%sT 1976 889 -5:00 - EST 2006 890 -5:00 US E%sT 891 # 892 # Daviess, Dubois, Knox, and Martin Counties, Indiana, 893 # switched from eastern to central time in April 2006, then switched back 894 # in November 2007. 895 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 896 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 897 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 898 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 899 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 900 Rule Vincennes 1955 only - May 1 0:00 1:00 D 901 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 902 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 903 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 904 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 905 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 906 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 907 -6:00 US C%sT 1946 908 -6:00 Vincennes C%sT 1964 Apr 26 2:00 909 -5:00 - EST 1969 910 -5:00 US E%sT 1971 911 -5:00 - EST 2006 Apr 2 2:00 912 -6:00 US C%sT 2007 Nov 4 2:00 913 -5:00 US E%sT 914 # 915 # Perry County, Indiana, switched from eastern to central time in April 2006. 916 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 917 Rule Perry 1946 only - Apr lastSun 2:00 1:00 D 918 Rule Perry 1946 only - Sep lastSun 2:00 0 S 919 Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D 920 Rule Perry 1953 1959 - Sep lastSun 2:00 0 S 921 Rule Perry 1955 only - May 1 0:00 1:00 D 922 Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 923 Rule Perry 1960 only - Oct lastSun 2:00 0 S 924 Rule Perry 1961 only - Sep lastSun 2:00 0 S 925 Rule Perry 1962 1963 - Oct lastSun 2:00 0 S 926 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 927 Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 928 -6:00 US C%sT 1946 929 -6:00 Perry C%sT 1964 Apr 26 2:00 930 -5:00 - EST 1969 931 -5:00 US E%sT 1971 932 -5:00 - EST 2006 Apr 2 2:00 933 -6:00 US C%sT 934 # 935 # Pike County, Indiana moved from central to eastern time in 1977, 936 # then switched back in 2006, then switched back again in 2007. 937 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 938 Rule Pike 1955 only - May 1 0:00 1:00 D 939 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 940 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 941 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 942 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 943 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 944 -6:00 US C%sT 1955 945 -6:00 Pike C%sT 1965 Apr 25 2:00 946 -5:00 - EST 1966 Oct 30 2:00 947 -6:00 US C%sT 1977 Oct 30 2:00 948 -5:00 - EST 2006 Apr 2 2:00 949 -6:00 US C%sT 2007 Nov 4 2:00 950 -5:00 US E%sT 951 # 952 # Starke County, Indiana moved from central to eastern time in 1991, 953 # then switched back in 2006. 954 # From Arthur David Olson (1991-10-28): 955 # An article on page A3 of the Sunday, 1991-10-27 Washington Post 956 # notes that Starke County switched from Central time to Eastern time as of 957 # 1991-10-27. 958 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 959 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 960 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 961 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 962 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 963 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 964 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 965 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 966 -6:00 US C%sT 1947 967 -6:00 Starke C%sT 1962 Apr 29 2:00 968 -5:00 - EST 1963 Oct 27 2:00 969 -6:00 US C%sT 1991 Oct 27 2:00 970 -5:00 - EST 2006 Apr 2 2:00 971 -6:00 US C%sT 972 # 973 # Pulaski County, Indiana, switched from eastern to central time in 974 # April 2006 and then switched back in March 2007. 975 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 976 Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 977 Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 978 Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 979 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 980 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 981 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 982 -6:00 US C%sT 1946 983 -6:00 Pulaski C%sT 1961 Apr 30 2:00 984 -5:00 - EST 1969 985 -5:00 US E%sT 1971 986 -5:00 - EST 2006 Apr 2 2:00 987 -6:00 US C%sT 2007 Mar 11 2:00 988 -5:00 US E%sT 989 # 990 # Switzerland County, Indiana, did not observe DST from 1973 through 2005. 991 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 992 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 993 -6:00 US C%sT 1954 Apr 25 2:00 994 -5:00 - EST 1969 995 -5:00 US E%sT 1973 996 -5:00 - EST 2006 997 -5:00 US E%sT 998 999 # From Paul Eggert (2018-03-20): 1000 # The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1001 # 10:00 old local time; train were supposed to come to a standstill 1002 # for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1003 # clear how this matched civil time in Louisville, so for now continue 1004 # to assume Louisville switched at noon new local time, like New York. 1005 # 1006 # Part of Kentucky left its clocks alone in 1974. 1007 # This also includes Clark, Floyd, and Harrison counties in Indiana. 1008 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1009 Rule Louisville 1921 only - May 1 2:00 1:00 D 1010 Rule Louisville 1921 only - Sep 1 2:00 0 S 1011 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 1012 Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1013 Rule Louisville 1946 only - Jun 2 2:00 0 S 1014 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1015 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 1016 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1017 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 1018 -6:00 US C%sT 1921 1019 -6:00 Louisville C%sT 1942 1020 -6:00 US C%sT 1946 1021 -6:00 Louisville C%sT 1961 Jul 23 2:00 1022 -5:00 - EST 1968 1023 -5:00 US E%sT 1974 Jan 6 2:00 1024 -6:00 1:00 CDT 1974 Oct 27 2:00 1025 -5:00 US E%sT 1026 # 1027 # Wayne County, Kentucky 1028 # 1029 # From Lake Cumberland LIFE 1030 # http://www.lake-cumberland.com/life/archive/news990129time.shtml 1031 # (1999-01-29) via WKYM-101.7: 1032 # Clinton County has joined Wayne County in asking the DoT to change from 1033 # the Central to the Eastern time zone.... The Wayne County government made 1034 # the same request in December. And while Russell County officials have not 1035 # taken action, the majority of respondents to a poll conducted there in 1036 # August indicated they would like to change to "fast time" also. 1037 # The three Lake Cumberland counties are the farthest east of any U.S. 1038 # location in the Central time zone. 1039 # 1040 # From Rich Wales (2000-08-29): 1041 # After prolonged debate, and despite continuing deep differences of opinion, 1042 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1043 # (-0500) time. They won't "fall back" this year. See Sara Shipley, 1044 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1045 # 1046 # From Paul Eggert (2001-07-16): 1047 # The final rule was published in the 1048 # Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1049 # https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1050 # 1051 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 1052 -6:00 US C%sT 1946 1053 -6:00 - CST 1968 1054 -6:00 US C%sT 2000 Oct 29 2:00 1055 -5:00 US E%sT 1056 1057 1058 # From Rives McDow (2000-08-30): 1059 # Here ... are all the changes in the US since 1985. 1060 # Kearny County, KS (put all of county on central; 1061 # previously split between MST and CST) ... 1990-10 1062 # Starke County, IN (from CST to EST) ... 1991-10 1063 # Oliver County, ND (from MST to CST) ... 1992-10 1064 # West Wendover, NV (from PST TO MST) ... 1999-10 1065 # Wayne County, KY (from CST to EST) ... 2000-10 1066 # 1067 # From Paul Eggert (2001-07-17): 1068 # We don't know where the line used to be within Kearny County, KS, 1069 # so omit that change for now. 1070 # See America/Indiana/Knox for the Starke County, IN change. 1071 # See America/North_Dakota/Center for the Oliver County, ND change. 1072 # West Wendover, NV officially switched from Pacific to mountain time on 1073 # 1999-10-31. See the 1074 # Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1075 # https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1076 # However, the Federal Register says that West Wendover already operated 1077 # on mountain time, and the rule merely made this official; 1078 # hence a separate tz entry is not needed. 1079 1080 # Michigan 1081 # 1082 # From Bob Devine (1988-01-28): 1083 # Michigan didn't observe DST from 1968 to 1973. 1084 # 1085 # From Paul Eggert (1999-03-31): 1086 # Shanks writes that Michigan started using standard time on 1885-09-18, 1087 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1088 # that Detroit kept 1089 # 1090 # local time until 1900 when the City Council decreed that clocks should 1091 # be put back twenty-eight minutes to Central Standard Time. Half the 1092 # city obeyed, half refused. After considerable debate, the decision 1093 # was rescinded and the city reverted to Sun time. A derisive offer to 1094 # erect a sundial in front of the city hall was referred to the 1095 # Committee on Sewers. Then, in 1905, Central time was adopted 1096 # by city vote. 1097 # 1098 # This story is too entertaining to be false, so go with Howse over Shanks. 1099 # 1100 # From Paul Eggert (2001-03-06): 1101 # Garland (1927) writes "Cleveland and Detroit advanced their clocks 1102 # one hour in 1914." This change is not in Shanks. We have no more 1103 # info, so omit this for now. 1104 # 1105 # From Paul Eggert (2017-07-26): 1106 # Although Shanks says Detroit observed DST in 1967 from 06-14 00:01 1107 # until 10-29 00:01, I now see multiple reports that this is incorrect. 1108 # For example, according to a 50-year anniversary report about the 1967 1109 # Detroit riots and a major-league doubleheader on 1967-07-23, "By the time 1110 # the last fly ball of the doubleheader settled into the glove of leftfielder 1111 # Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving 1112 # time, so light was already starting to fail. Twilight was made even deeper 1113 # by billowing columns of smoke that ascended in an unbroken wall north of the 1114 # ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two 1115 # at home vs. Yankees. Detroit Free Press 2017-07-23. 1116 # https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/ 1117 # 1118 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1119 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1120 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1121 Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1122 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1123 Zone America/Detroit -5:32:11 - LMT 1905 1124 -6:00 - CST 1915 May 15 2:00 1125 -5:00 - EST 1942 1126 -5:00 US E%sT 1946 1127 -5:00 Detroit E%sT 1973 1128 -5:00 US E%sT 1975 1129 -5:00 - EST 1975 Apr 27 2:00 1130 -5:00 US E%sT 1131 # 1132 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1133 # switched from EST to CST/CDT in 1973. 1134 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1135 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1136 Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1137 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1138 Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1139 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1140 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1141 -6:00 US C%sT 1946 1142 -6:00 Menominee C%sT 1969 Apr 27 2:00 1143 -5:00 - EST 1973 Apr 29 2:00 1144 -6:00 US C%sT 1145 1146 # Navassa 1147 # administered by the US Fish and Wildlife Service 1148 # claimed by US under the provisions of the 1856 Guano Islands Act 1149 # also claimed by Haiti 1150 # occupied 1857/1900 by the Navassa Phosphate Co 1151 # US lighthouse 1917/1996-09 1152 # currently uninhabited 1153 # see Mark Fineman, "An Isle Rich in Guano and Discord", 1154 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1155 # Jimmy Skaggs, _The Great Guano Rush_ (1994). 1156 1157 ################################################################################ 1158 1159 1160 # From Paul Eggert (2017-02-10): 1161 # 1162 # Unless otherwise specified, the source for data through 1990 is: 1163 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1164 # San Diego: ACS Publications, Inc. (2003). 1165 # Unfortunately this book contains many errors and cites no sources. 1166 # 1167 # Many years ago Gwillim Law wrote that a good source 1168 # for time zone data was the International Air Transport 1169 # Association's Standard Schedules Information Manual (IATA SSIM), 1170 # published semiannually. Law sent in several helpful summaries 1171 # of the IATA's data after 1990. Except where otherwise noted, 1172 # IATA SSIM is the source for entries after 1990. 1173 # 1174 # Other sources occasionally used include: 1175 # 1176 # Edward W. Whitman, World Time Differences, 1177 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1178 # which I found in the UCLA library. 1179 # 1180 # William Willett, The Waste of Daylight, 19th edition 1181 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1182 # [PDF] (1914-03) 1183 # 1184 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1185 # <https://www.jstor.org/stable/1774359>. 1186 # 1187 # See the 'europe' file for Greenland. 1188 1189 # Canada 1190 1191 # From Alain LaBonté (1994-11-14): 1192 # I post here the time zone abbreviations standardized in Canada 1193 # for both English and French in the CAN/CSA-Z234.4-89 standard.... 1194 # 1195 # UTC Standard time Daylight saving time 1196 # offset French English French English 1197 # -2:30 - - HAT NDT 1198 # -3 - - HAA ADT 1199 # -3:30 HNT NST - - 1200 # -4 HNA AST HAE EDT 1201 # -5 HNE EST HAC CDT 1202 # -6 HNC CST HAR MDT 1203 # -7 HNR MST HAP PDT 1204 # -8 HNP PST HAY YDT 1205 # -9 HNY YST - - 1206 # 1207 # HN: Heure Normale ST: Standard Time 1208 # HA: Heure Avancée DT: Daylight saving Time 1209 # 1210 # A: de l'Atlantique Atlantic 1211 # C: du Centre Central 1212 # E: de l'Est Eastern 1213 # M: Mountain 1214 # N: Newfoundland 1215 # P: du Pacifique Pacific 1216 # R: des Rocheuses 1217 # T: de Terre-Neuve 1218 # Y: du Yukon Yukon 1219 # 1220 # From Paul Eggert (1994-11-22): 1221 # Alas, this sort of thing must be handled by localization software. 1222 1223 # Unless otherwise specified, the data entries for Canada are all from Shanks 1224 # & Pottenger. 1225 1226 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1227 # 2007-03-01): 1228 # The British Columbia government announced yesterday that it will 1229 # adjust daylight savings next year to align with changes in the 1230 # U.S. and the rest of Canada.... 1231 # https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1232 # ... 1233 # Nova Scotia 1234 # Daylight saving time will be extended by four weeks starting in 2007.... 1235 # https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1236 # 1237 # [For New Brunswick] the new legislation dictates that the time change is to 1238 # be done at 02:00 instead of 00:01. 1239 # https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1240 # ... 1241 # Manitoba has traditionally changed the clock every fall at 03:00. 1242 # As of 2006, the transition is to take place one hour earlier at 02:00. 1243 # https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1244 # ... 1245 # [Alberta, Ontario, Quebec] will follow US rules. 1246 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1247 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1248 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1249 # ... 1250 # P.E.I. will follow US rules.... 1251 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1252 # ... 1253 # Province of Newfoundland and Labrador.... 1254 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1255 # ... 1256 # Yukon 1257 # https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1258 # ... 1259 # N.W.T. will follow US rules. Whoever maintains the government web site 1260 # does not seem to believe in bookmarks. To see the news release, click the 1261 # following link and search for "Daylight Savings Time Change". Press the 1262 # "Daylight Savings Time Change" link; it will fire off a popup using 1263 # JavaScript. 1264 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1265 # ... 1266 # Nunavut 1267 # An amendment to the Interpretation Act was registered on February 19/2007.... 1268 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1269 1270 # From Paul Eggert (2014-10-18): 1271 # H. David Matthews and Mary Vincent's map 1272 # "It's about TIME", _Canadian Geographic_ (September-October 1998) 1273 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp 1274 # contains detailed boundaries for regions observing nonstandard 1275 # time and daylight saving time arrangements in Canada circa 1998. 1276 # 1277 # National Research Council Canada maintains info about time zones and DST. 1278 # https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1279 # https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1280 # Its unofficial information is often taken from Matthews and Vincent. 1281 1282 # From Paul Eggert (2006-06-27): 1283 # For now, assume all of DST-observing Canada will fall into line with the 1284 # new US DST rules, 1285 1286 # From Chris Walton (2011-12-01) 1287 # In the first of Tammy Hardwick's articles 1288 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1289 # she quotes the Friday November 1/1918 edition of the Creston Review. 1290 # The quote includes these two statements: 1291 # 'Sunday the CPR went back to the old system of time...' 1292 # '... The daylight saving scheme was dropped all over Canada at the same time,' 1293 # These statements refer to a transition from daylight time to standard time 1294 # that occurred nationally on Sunday October 27/1918. This transition was 1295 # also documented in the Saturday October 26/1918 edition of the Toronto Star. 1296 1297 # In light of that evidence, we alter the date from the earlier believed 1298 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1299 # than Thursday) in all Canadian rulesets. 1300 1301 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1302 Rule Canada 1918 only - Apr 14 2:00 1:00 D 1303 Rule Canada 1918 only - Oct 27 2:00 0 S 1304 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1305 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1306 Rule Canada 1945 only - Sep 30 2:00 0 S 1307 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1308 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1309 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1310 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1311 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1312 1313 1314 # Newfoundland and Labrador 1315 1316 # From Paul Eggert (2017-10-14): 1317 # Legally Labrador should observe Newfoundland time; see: 1318 # McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1319 # http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1320 # Matthews and Vincent (1998) write that the only part of Labrador 1321 # that follows the rules is the southeast corner, including Port Hope 1322 # Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1323 1324 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1325 Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1326 Rule StJohns 1917 only - Sep 17 2:00 0 S 1327 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1328 Rule StJohns 1919 only - May 5 23:00 1:00 D 1329 Rule StJohns 1919 only - Aug 12 23:00 0 S 1330 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1331 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1332 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1333 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1334 # Pottenger. 1335 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1336 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1337 # Whitman gives the following transitions: 1338 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1339 # but go with Shanks & Pottenger and assume they used Canadian rules. 1340 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1341 # Apr 30 - Sep 24; go with Shanks & Pottenger. 1342 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1343 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1344 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1345 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1346 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1347 # From Paul Eggert (2000-10-02): 1348 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1349 # at 00:01 local time. For now, assume it started in 1987. 1350 1351 # From Michael Pelley (2011-09-12): 1352 # We received today, Monday, September 12, 2011, notification that the 1353 # changes to the Newfoundland Standard Time Act have been proclaimed. 1354 # The change in the Act stipulates that the change from Daylight Savings 1355 # Time to Standard Time and from Standard Time to Daylight Savings Time 1356 # now occurs at 2:00AM. 1357 # ... 1358 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1359 # ... 1360 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1361 # Office of the Chief Information Officer 1362 # Executive Council 1363 # Government of Newfoundland & Labrador 1364 1365 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1366 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1367 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1368 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1369 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1370 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1371 # 1372 # St John's has an apostrophe, but Posix file names can't have apostrophes. 1373 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1374 Zone America/St_Johns -3:30:52 - LMT 1884 1375 -3:30:52 StJohns N%sT 1918 1376 -3:30:52 Canada N%sT 1919 1377 -3:30:52 StJohns N%sT 1935 Mar 30 1378 -3:30 StJohns N%sT 1942 May 11 1379 -3:30 Canada N%sT 1946 1380 -3:30 StJohns N%sT 2011 Nov 1381 -3:30 Canada N%sT 1382 1383 # most of east Labrador 1384 1385 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1386 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1387 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1388 -3:30:52 - NST 1918 1389 -3:30:52 Canada N%sT 1919 1390 -3:30:52 - NST 1935 Mar 30 1391 -3:30 - NST 1936 1392 -3:30 StJohns N%sT 1942 May 11 1393 -3:30 Canada N%sT 1946 1394 -3:30 StJohns N%sT 1966 Mar 15 2:00 1395 -4:00 StJohns A%sT 2011 Nov 1396 -4:00 Canada A%sT 1397 1398 1399 # west Labrador, Nova Scotia, Prince Edward I 1400 1401 # From Brian Inglis (2015-07-20): 1402 # From the historical weather station records available at: 1403 # https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1404 # Sydney shares the same time history as Glace Bay, so was 1405 # likely to be the same across the island.... 1406 # Sydney, as the capital and most populous location, or Cape Breton, would 1407 # have been better names for the zone had we known this in 1996. 1408 1409 # From Paul Eggert (2015-07-20): 1410 # Shanks & Pottenger write that since 1970 most of this region has been like 1411 # Halifax. Many locales did not observe peacetime DST until 1972; 1412 # the Cape Breton area, represented by Glace Bay, is the largest we know of 1413 # (Glace Bay was perhaps not the best name choice but no point changing now). 1414 # Shanks & Pottenger also write that Liverpool, NS was the only town 1415 # in Canada to observe DST in 1971 but not 1970; for now we'll assume 1416 # this is a typo. 1417 1418 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1419 Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1420 Rule Halifax 1916 only - Oct 1 0:00 0 S 1421 Rule Halifax 1920 only - May 9 0:00 1:00 D 1422 Rule Halifax 1920 only - Aug 29 0:00 0 S 1423 Rule Halifax 1921 only - May 6 0:00 1:00 D 1424 Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1425 Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1426 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1427 Rule Halifax 1923 only - Sep 4 0:00 0 S 1428 Rule Halifax 1924 only - Sep 15 0:00 0 S 1429 Rule Halifax 1925 only - Sep 28 0:00 0 S 1430 Rule Halifax 1926 only - May 16 0:00 1:00 D 1431 Rule Halifax 1926 only - Sep 13 0:00 0 S 1432 Rule Halifax 1927 only - May 1 0:00 1:00 D 1433 Rule Halifax 1927 only - Sep 26 0:00 0 S 1434 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1435 Rule Halifax 1928 only - Sep 9 0:00 0 S 1436 Rule Halifax 1929 only - Sep 3 0:00 0 S 1437 Rule Halifax 1930 only - Sep 15 0:00 0 S 1438 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1439 Rule Halifax 1932 only - May 1 0:00 1:00 D 1440 Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1441 Rule Halifax 1933 only - Oct 2 0:00 0 S 1442 Rule Halifax 1934 only - May 20 0:00 1:00 D 1443 Rule Halifax 1934 only - Sep 16 0:00 0 S 1444 Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1445 Rule Halifax 1935 only - Sep 30 0:00 0 S 1446 Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1447 Rule Halifax 1936 only - Sep 14 0:00 0 S 1448 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1449 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1450 Rule Halifax 1939 only - May 28 0:00 1:00 D 1451 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1452 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1453 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1454 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1455 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1456 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1457 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1458 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1459 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1460 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1461 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1462 -4:00 Halifax A%sT 1918 1463 -4:00 Canada A%sT 1919 1464 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1465 -4:00 Canada A%sT 1946 1466 -4:00 Halifax A%sT 1974 1467 -4:00 Canada A%sT 1468 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1469 -4:00 Canada A%sT 1953 1470 -4:00 Halifax A%sT 1954 1471 -4:00 - AST 1972 1472 -4:00 Halifax A%sT 1974 1473 -4:00 Canada A%sT 1474 1475 # New Brunswick 1476 1477 # From Paul Eggert (2007-01-31): 1478 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1479 # says they changed at 00:01 through 2006, and 1480 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1481 # clear that this was the case since at least 1993. 1482 # For now, assume it started in 1993. 1483 1484 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1485 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1486 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1487 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1488 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1489 Rule Moncton 1939 only - May 27 1:00 1:00 D 1490 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1491 Rule Moncton 1940 only - May 19 1:00 1:00 D 1492 Rule Moncton 1941 only - May 4 1:00 1:00 D 1493 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1494 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1495 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1496 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1497 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1498 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1499 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1500 -5:00 - EST 1902 Jun 15 1501 -4:00 Canada A%sT 1933 1502 -4:00 Moncton A%sT 1942 1503 -4:00 Canada A%sT 1946 1504 -4:00 Moncton A%sT 1973 1505 -4:00 Canada A%sT 1993 1506 -4:00 Moncton A%sT 2007 1507 -4:00 Canada A%sT 1508 1509 # Quebec 1510 1511 # From Paul Eggert (2015-03-24): 1512 # See America/Toronto for most of Quebec, including Montreal. 1513 # 1514 # Matthews and Vincent (1998) also write that Quebec east of the -63 1515 # meridian is supposed to observe AST, but residents as far east as 1516 # Natashquan use EST/EDT, and residents east of Natashquan use AST. 1517 # The Quebec department of justice writes in 1518 # "The situation in Minganie and Basse-Côte-Nord" 1519 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm 1520 # that the coastal strip from just east of Natashquan to Blanc-Sablon 1521 # observes Atlantic standard time all year round. 1522 # https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en 1523 # says this common practice was codified into law as of 2007. 1524 # For lack of better info, guess this practice began around 1970, contra to 1525 # Shanks & Pottenger who have this region observing AST/ADT. 1526 1527 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1528 Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1529 -4:00 Canada A%sT 1970 1530 -4:00 - AST 1531 1532 # Ontario 1533 1534 # From Paul Eggert (2006-07-09): 1535 # Shanks & Pottenger write that since 1970 most of Ontario has been like 1536 # Toronto. 1537 # Thunder Bay skipped DST in 1973. 1538 # Many smaller locales did not observe peacetime DST until 1974; 1539 # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1540 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1541 1542 # From Mark Brader (2003-07-26): 1543 # [According to the Toronto Star] Orillia, Ontario, adopted DST 1544 # effective Saturday, 1912-06-22, 22:00; the article mentions that 1545 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1546 # have already done so. In Orillia DST was to run until Saturday, 1547 # 1912-08-31 (no time mentioned), but it was met with considerable 1548 # hostility from certain segments of the public, and was revoked after 1549 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1550 # presumably that should be -07-06. (1912-06-19, -07-12; also letters 1551 # earlier in June). 1552 # 1553 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1554 # 1555 # From Paul Eggert (2017-07-08): 1556 # For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1557 # time became a comic failure in Orillia. Toronto Star 2017-07-08. 1558 # https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1559 1560 # From Paul Eggert (1997-10-17): 1561 # Mark Brader writes that an article in the 1997-10-14 Toronto Star 1562 # says that Atikokan, Ontario currently does not observe DST, 1563 # but will vote on 11-10 whether to use EST/EDT. 1564 # He also writes that the Ontario Time Act (1990, Chapter T.9) 1565 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html 1566 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1567 # Officially Atikokan is therefore on CST/CDT, and most likely this report 1568 # concerns a non-official time observed as a matter of local practice. 1569 # 1570 # From Paul Eggert (2000-10-02): 1571 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1572 # New Osnaburgh observe CST all year, that Big Trout Lake observes 1573 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1574 # violation of the official Ontario rules. 1575 # 1576 # From Paul Eggert (2006-07-09): 1577 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1578 # 2005-07-21 Chronicle-Journal, which said: 1579 # 1580 # The clocks in Atikokan stay set on standard time year-round. 1581 # This means they spend about half the time on central time and 1582 # the other half on eastern time. 1583 # 1584 # For the most part, the system works, Mayor Dennis Brown said. 1585 # 1586 # "The majority of businesses in Atikokan deal more with Eastern 1587 # Canada, but there are some that deal with Western Canada," he 1588 # said. "I don't see any changes happening here." 1589 # 1590 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1591 # [New Osnaburgh] follow the same practice." 1592 1593 # From Garry McKinnon (2006-07-14) via Chris Walton: 1594 # I chatted with a member of my board who has an outstanding memory 1595 # and a long history in Atikokan (and in the telecom industry) and he 1596 # can say for certain that Atikokan has been practicing the current 1597 # time keeping since 1952, at least. 1598 1599 # From Paul Eggert (2006-07-17): 1600 # Shanks & Pottenger say that Atikokan has agreed with Rainy River 1601 # ever since standard time was introduced, but the information from 1602 # McKinnon sounds more authoritative. For now, assume that Atikokan 1603 # switched to EST immediately after WWII era daylight saving time 1604 # ended. This matches the old (less-populous) America/Coral_Harbour 1605 # entry since our cutoff date of 1970, so we can move 1606 # America/Coral_Harbour to the 'backward' file. 1607 1608 # From Mark Brader (2010-03-06): 1609 # 1610 # Currently the database has: 1611 # 1612 # # Ontario 1613 # 1614 # # From Paul Eggert (2006-07-09): 1615 # # Shanks & Pottenger write that since 1970 most of Ontario has been like 1616 # # Toronto. 1617 # # Thunder Bay skipped DST in 1973. 1618 # # Many smaller locales did not observe peacetime DST until 1974; 1619 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1620 # 1621 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1622 # right corner of page 1, it says that Toronto will return to standard 1623 # time at 2 am Sunday morning (which agrees with the database), and that: 1624 # 1625 # The one-hour setback will go into effect throughout most of Ontario, 1626 # except in areas like Windsor which remains on standard time all year. 1627 # 1628 # Windsor is, of course, a lot larger than Nipigon. 1629 # 1630 # I only came across this incidentally. I don't know if Windsor began 1631 # observing DST when Detroit did, or in 1974, or on some other date. 1632 # 1633 # By the way, the article continues by noting that: 1634 # 1635 # Some cities in the United States have pushed the deadline back 1636 # three weeks and will change over from daylight saving in October. 1637 1638 # From Arthur David Olson (2010-07-17): 1639 # 1640 # "Standard Time and Time Zones in Canada" appeared in 1641 # The Journal of The Royal Astronomical Society of Canada, 1642 # volume 26, number 2 (February 1932) and, as of 2010-07-17, 1643 # was available at 1644 # http://adsabs.harvard.edu/full/1932JRASC..26...49S 1645 # 1646 # It includes the text below (starting on page 57): 1647 # 1648 # A list of the places in Canada using daylight saving time would 1649 # require yearly revision. From information kindly furnished by 1650 # the provincial governments and by the postmasters in many cities 1651 # and towns, it is found that the following places used daylight sav- 1652 # ing in 1930. The information for the province of Quebec is definite, 1653 # for the other provinces only approximate: 1654 # 1655 # Province Daylight saving time used 1656 # Prince Edward Island Not used. 1657 # Nova Scotia In Halifax only. 1658 # New Brunswick In St. John only. 1659 # Quebec In the following places: 1660 # Montreal Lachine 1661 # Quebec Mont-Royal 1662 # Lévis Iberville 1663 # St. Lambert Cap de la Madelèine 1664 # Verdun Loretteville 1665 # Westmount Richmond 1666 # Outremont St. Jérôme 1667 # Longueuil Greenfield Park 1668 # Arvida Waterloo 1669 # Chambly-Canton Beaulieu 1670 # Melbourne La Tuque 1671 # St. Théophile Buckingham 1672 # Ontario Used generally in the cities and towns along 1673 # the southerly part of the province. Not 1674 # used in the northwesterly part. 1675 # Manitoba Not used. 1676 # Saskatchewan In Regina only. 1677 # Alberta Not used. 1678 # British Columbia Not used. 1679 # 1680 # With some exceptions, the use of daylight saving may be said to be limited 1681 # to those cities and towns lying between Quebec city and Windsor, Ont. 1682 1683 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1684 Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1685 Rule Toronto 1919 only - Oct 26 0:00 0 S 1686 Rule Toronto 1920 only - May 2 2:00 1:00 D 1687 Rule Toronto 1920 only - Sep 26 0:00 0 S 1688 Rule Toronto 1921 only - May 15 2:00 1:00 D 1689 Rule Toronto 1921 only - Sep 15 2:00 0 S 1690 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1691 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1692 # was meant. 1693 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1694 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1695 # The 1927-to-1939 rules can be expressed more simply as 1696 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1697 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1698 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1699 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1700 # The rules below avoid use of Sun>=25 1701 # (which pre-2004 versions of zic cannot handle). 1702 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1703 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1704 Rule Toronto 1932 only - May 1 2:00 1:00 D 1705 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1706 Rule Toronto 1933 only - Oct 1 2:00 0 S 1707 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1708 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1709 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1710 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1711 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1712 Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1713 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1714 Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1715 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1716 # Shanks & Pottenger say Toronto ended DST a week early in 1971, 1717 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1718 # is wrong, and that he had confirmed it by checking the 1971-10-30 1719 # Toronto Star, which said that DST was ending 1971-10-31 as usual. 1720 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1721 1722 # From Paul Eggert (2003-07-27): 1723 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1724 # Port Arthur, Ontario, the principle of the Bill has been in 1725 # operation for the past three years, and in the City of Moose Jaw, 1726 # Saskatchewan, for one year." 1727 1728 # From David Bryan via Tory Tronrud, Director/Curator, 1729 # Thunder Bay Museum (2003-11-12): 1730 # There is some suggestion, however, that, by-law or not, daylight 1731 # savings time was being practiced in Fort William and Port Arthur 1732 # before 1909.... [I]n 1910, the line between the Eastern and Central 1733 # Time Zones was permanently moved about two hundred miles west to 1734 # include the Thunder Bay area.... When Canada adopted daylight 1735 # savings time in 1916, Fort William and Port Arthur, having done so 1736 # already, did not change their clocks.... During the Second World 1737 # War,... [t]he cities agreed to implement DST during the summer 1738 # months for the remainder of the war years. 1739 1740 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1741 Zone America/Toronto -5:17:32 - LMT 1895 1742 -5:00 Canada E%sT 1919 1743 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1744 -5:00 Canada E%sT 1946 1745 -5:00 Toronto E%sT 1974 1746 -5:00 Canada E%sT 1747 Zone America/Thunder_Bay -5:57:00 - LMT 1895 1748 -6:00 - CST 1910 1749 -5:00 - EST 1942 1750 -5:00 Canada E%sT 1970 1751 -5:00 Toronto E%sT 1973 1752 -5:00 - EST 1974 1753 -5:00 Canada E%sT 1754 Zone America/Nipigon -5:53:04 - LMT 1895 1755 -5:00 Canada E%sT 1940 Sep 29 1756 -5:00 1:00 EDT 1942 Feb 9 2:00s 1757 -5:00 Canada E%sT 1758 Zone America/Rainy_River -6:18:16 - LMT 1895 1759 -6:00 Canada C%sT 1940 Sep 29 1760 -6:00 1:00 CDT 1942 Feb 9 2:00s 1761 -6:00 Canada C%sT 1762 Zone America/Atikokan -6:06:28 - LMT 1895 1763 -6:00 Canada C%sT 1940 Sep 29 1764 -6:00 1:00 CDT 1942 Feb 9 2:00s 1765 -6:00 Canada C%sT 1945 Sep 30 2:00 1766 -5:00 - EST 1767 1768 1769 # Manitoba 1770 1771 # From Rob Douglas (2006-04-06): 1772 # the old Manitoba Time Act - as amended by Bill 2, assented to 1773 # March 27, 1987 ... said ... 1774 # "between two o'clock Central Standard Time in the morning of 1775 # the first Sunday of April of each year and two o'clock Central 1776 # Standard Time in the morning of the last Sunday of October next 1777 # following, one hour in advance of Central Standard Time."... 1778 # I believe that the English legislation [of the old time act] had 1779 # been assented to (March 22, 1967).... 1780 # Also, as far as I can tell, there was no order-in-council varying 1781 # the time of Daylight Saving Time for 2005 and so the provisions of 1782 # the 1987 version would apply - the changeover was at 2:00 Central 1783 # Standard Time (i.e. not until 3:00 Central Daylight Time). 1784 1785 # From Paul Eggert (2006-04-10): 1786 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1787 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1788 # it was also 02:00s in 1966. 1789 1790 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1791 Rule Winn 1916 only - Apr 23 0:00 1:00 D 1792 Rule Winn 1916 only - Sep 17 0:00 0 S 1793 Rule Winn 1918 only - Apr 14 2:00 1:00 D 1794 Rule Winn 1918 only - Oct 27 2:00 0 S 1795 Rule Winn 1937 only - May 16 2:00 1:00 D 1796 Rule Winn 1937 only - Sep 26 2:00 0 S 1797 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1798 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1799 Rule Winn 1945 only - Sep lastSun 2:00 0 S 1800 Rule Winn 1946 only - May 12 2:00 1:00 D 1801 Rule Winn 1946 only - Oct 13 2:00 0 S 1802 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1803 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1804 Rule Winn 1950 only - May 1 2:00 1:00 D 1805 Rule Winn 1950 only - Sep 30 2:00 0 S 1806 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1807 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1808 Rule Winn 1959 only - Oct lastSun 2:00 0 S 1809 Rule Winn 1960 only - Sep lastSun 2:00 0 S 1810 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1811 Rule Winn 1963 only - Sep 22 2:00 0 S 1812 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1813 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1814 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1815 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1816 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1817 -6:00 Winn C%sT 2006 1818 -6:00 Canada C%sT 1819 1820 1821 # Saskatchewan 1822 1823 # From Mark Brader (2003-07-26): 1824 # The first actual adoption of DST in Canada was at the municipal 1825 # level. As the [Toronto] Star put it (1912-06-07), "While people 1826 # elsewhere have long been talking of legislation to save daylight, 1827 # the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1828 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1829 # presumably late evening, as below), and would run until "the end of 1830 # the summer". The discrepancy between municipal time and railroad 1831 # time was noted. 1832 1833 # From Paul Eggert (2003-07-27): 1834 # Willett (1914-03) notes that DST "has been in operation ... in the 1835 # City of Moose Jaw, Saskatchewan, for one year." 1836 1837 # From Paul Eggert (2006-03-22): 1838 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1839 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1840 # Other western towns (e.g. Lloydminster) are like Edmonton. 1841 # Matthews and Vincent (1998) write that Denare Beach and Creighton 1842 # are like Winnipeg, in violation of Saskatchewan law. 1843 1844 # From W. Jones (1992-11-06): 1845 # The. . .below is based on information I got from our law library, the 1846 # provincial archives, and the provincial Community Services department. 1847 # A precise history would require digging through newspaper archives, and 1848 # since you didn't say what you wanted, I didn't bother. 1849 # 1850 # Saskatchewan is split by a time zone meridian (105W) and over the years 1851 # the boundary became pretty ragged as communities near it reevaluated 1852 # their affiliations in one direction or the other. In 1965 a provincial 1853 # referendum favoured legislating common time practices. 1854 # 1855 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1856 # Saskatchewan 1978) was proclaimed, and established that the eastern 1857 # part of Saskatchewan would use CST year round, that districts in 1858 # northwest Saskatchewan would by default follow CST but could opt to 1859 # follow Mountain Time rules (thus 1 hour difference in the winter and 1860 # zero in the summer), and that districts in southwest Saskatchewan would 1861 # by default follow MT but could opt to follow CST. 1862 # 1863 # It took a few years for the dust to settle (I know one story of a town 1864 # on one time zone having its school in another, such that a mom had to 1865 # serve her family lunch in two shifts), but presently it seems that only 1866 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1867 # rules any more; all other districts appear to have used CST year round 1868 # since sometime in the 1960s. 1869 1870 # From Chris Walton (2006-06-26): 1871 # The Saskatchewan time act which was last updated in 1996 is about 30 pages 1872 # long and rather painful to read. 1873 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1874 1875 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1876 Rule Regina 1918 only - Apr 14 2:00 1:00 D 1877 Rule Regina 1918 only - Oct 27 2:00 0 S 1878 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1879 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1880 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1881 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1882 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1883 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1884 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1885 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1886 Rule Regina 1945 only - Sep lastSun 2:00 0 S 1887 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1888 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1889 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1890 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1891 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1892 Rule Regina 1959 only - Oct lastSun 2:00 0 S 1893 # 1894 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1895 Rule Swift 1957 only - Oct lastSun 2:00 0 S 1896 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1897 Rule Swift 1959 only - Oct lastSun 2:00 0 S 1898 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1899 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1900 Zone America/Regina -6:58:36 - LMT 1905 Sep 1901 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1902 -6:00 - CST 1903 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1904 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1905 -7:00 Regina M%sT 1950 1906 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1907 -6:00 - CST 1908 1909 1910 # Alberta 1911 1912 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1913 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1914 Rule Edm 1918 only - Oct 27 2:00 0 S 1915 Rule Edm 1919 only - May 27 2:00 0 S 1916 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1917 Rule Edm 1920 only - Oct lastSun 2:00 0 S 1918 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1919 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1920 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1921 Rule Edm 1945 only - Sep lastSun 2:00 0 S 1922 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1923 Rule Edm 1947 only - Sep lastSun 2:00 0 S 1924 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1925 Rule Edm 1967 only - Oct lastSun 2:00 0 S 1926 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1927 Rule Edm 1969 only - Oct lastSun 2:00 0 S 1928 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1929 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1930 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1931 Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1932 -7:00 Edm M%sT 1987 1933 -7:00 Canada M%sT 1934 1935 1936 # British Columbia 1937 1938 # From Paul Eggert (2006-03-22): 1939 # Shanks & Pottenger write that since 1970 most of this region has 1940 # been like Vancouver. 1941 # Dawson Creek uses MST. Much of east BC is like Edmonton. 1942 # Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1943 1944 # It seems though that (re: Creston) is not entirely correct: 1945 1946 # From Chris Walton (2011-12-01): 1947 # There are two areas within the Canadian province of British Columbia 1948 # that do not currently observe daylight saving: 1949 # a) The Creston Valley (includes the town of Creston and surrounding area) 1950 # b) The eastern half of the Peace River Regional District 1951 # (includes the cities of Dawson Creek and Fort St. John) 1952 1953 # Earlier this year I stumbled across a detailed article about the time 1954 # keeping history of Creston; it was written by Tammy Hardwick who is the 1955 # manager of the Creston & District Museum. The article was written in May 2009. 1956 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1957 # According to the article, Creston has not changed its clocks since June 1918. 1958 # i.e. Creston has been stuck on UT-7 for 93 years. 1959 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972. 1960 1961 # Unfortunately the exact date for the time change in June 1918 remains 1962 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months 1963 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just 1964 # as plausible as any other date (in June). She also said that after writing 1965 # the article she had discovered another time change in 1916; this is the 1966 # subject of another article which she wrote in October 2010. 1967 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 1968 1969 # Here is a summary of the three clock change events in Creston's history: 1970 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) 1971 # Exact date unknown 1972 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8) 1973 # Exact date in October unknown; Sunday October 1 is a reasonable guess. 1974 # 3. June 1918: switch to Pacific Daylight Time (GMT-7) 1975 # Exact date in June unknown; Sunday June 2 is a reasonable guess. 1976 # note 1: 1977 # On Oct 27/1918 when daylight saving ended in the rest of Canada, 1978 # Creston did not change its clocks. 1979 # note 2: 1980 # During WWII when the Federal Government legislated a mandatory clock change, 1981 # Creston did not oblige. 1982 # note 3: 1983 # There is no guarantee that Creston will remain on Mountain Standard Time 1984 # (UTC-7) forever. 1985 # The subject was debated at least once this year by the town Council. 1986 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html 1987 1988 # During a period WWII, summer time (Daylight saying) was mandatory in Canada. 1989 # In Creston, that was handled by shifting the area to PST (-8:00) then applying 1990 # summer time to cause the offset to be -7:00, the same as it had been before 1991 # the change. It can be argued that the timezone abbreviation during this 1992 # period should be PDT rather than MST, but that doesn't seem important enough 1993 # (to anyone) to further complicate the rules. 1994 1995 # The transition dates (and times) are guesses. 1996 1997 # From Matt Johnson (2015-09-21): 1998 # Fort Nelson, BC, Canada will cancel DST this year. So while previously they 1999 # were aligned with America/Vancouver, they're now aligned with 2000 # America/Dawson_Creek. 2001 # http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 2002 # 2003 # From Tim Parenti (2015-09-23): 2004 # This requires a new zone for the Northern Rockies Regional Municipality, 2005 # America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 2006 # 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 2007 # been on MST (-0700) like Dawson Creek since it advanced its clocks on 2008 # 2015-03-08. 2009 # 2010 # From Paul Eggert (2015-09-23): 2011 # Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 2012 2013 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2014 Rule Vanc 1918 only - Apr 14 2:00 1:00 D 2015 Rule Vanc 1918 only - Oct 27 2:00 0 S 2016 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 2017 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 2018 Rule Vanc 1945 only - Sep 30 2:00 0 S 2019 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 2020 Rule Vanc 1946 only - Oct 13 2:00 0 S 2021 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 2022 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 2023 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2024 Zone America/Vancouver -8:12:28 - LMT 1884 2025 -8:00 Vanc P%sT 1987 2026 -8:00 Canada P%sT 2027 Zone America/Dawson_Creek -8:00:56 - LMT 1884 2028 -8:00 Canada P%sT 1947 2029 -8:00 Vanc P%sT 1972 Aug 30 2:00 2030 -7:00 - MST 2031 Zone America/Fort_Nelson -8:10:47 - LMT 1884 2032 -8:00 Vanc P%sT 1946 2033 -8:00 - PST 1947 2034 -8:00 Vanc P%sT 1987 2035 -8:00 Canada P%sT 2015 Mar 8 2:00 2036 -7:00 - MST 2037 Zone America/Creston -7:46:04 - LMT 1884 2038 -7:00 - MST 1916 Oct 1 2039 -8:00 - PST 1918 Jun 2 2040 -7:00 - MST 2041 2042 # Northwest Territories, Nunavut, Yukon 2043 2044 # From Paul Eggert (2006-03-22): 2045 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2046 # Mathew Englander (1996-10-07) gives the following refs: 2047 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2048 # c. 7 defines Yukon standard time as UTC-9.... 2049 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2050 # [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2051 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2052 # * O.I.C. 1980/02 established DST. 2053 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2054 2055 # From Brian Inglis (2015-04-14): 2056 # 2057 # I tried to trace the history of Yukon time and found the following 2058 # regulations, giving the reference title and URL if found, regulation name, 2059 # and relevant quote if available. Each regulation specifically revokes its 2060 # predecessor. The final reference is to the current Interpretation Act 2061 # authorizing and resulting from these regulatory changes. 2062 # 2063 # Only recent regulations were retrievable via Yukon government site search or 2064 # index, and only some via Canadian legal sources. Other sources used include 2065 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2066 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2067 # 1970 quoted below; each article includes current extracts from provincial 2068 # and territorial ST and DST regulations at the end, summaries and details of 2069 # standard times and daylight saving time at many locations across Canada, 2070 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2071 # and LMST; they also cover many countries and global locations, with a chart 2072 # and table showing current Universal Time offsets, and may be useful as 2073 # another source of information for 1970 and earlier. 2074 # 2075 # * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2076 # pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2077 # http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2078 # Yukon Interpretation Ordinance 2079 # Yukon standard time is the local mean time at the one hundred and 2080 # thirty-fifth meridian. 2081 # 2082 # * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2083 # JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2084 # (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2085 # Yukon Interpretation Ordinance, 1955, Chap. 16. 2086 # 2087 # (1) Subject to this section, standard time shall be reckoned as nine 2088 # hours behind Greenwich Time and called Yukon Standard Time. 2089 # 2090 # (2) Notwithstanding subsection (1), the Commissioner may make regulations 2091 # varying the manner of reckoning standard time. 2092 # 2093 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2094 # http://? - no online source found 2095 # 2096 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2097 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2098 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2099 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2100 # 2101 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2102 # Territory on 27th January, 1966, is hereby revoked. 2103 # 2104 # 2. Yukon (East) Standard Time as defined by section 36 of the 2105 # Interpretation Ordinance from and after mid-night on the 28th day of May, 2106 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2107 # is to say, eight hours behind Greenwich Time in the area of the Yukon 2108 # Territory lying east of the 138th degree longitude west. 2109 # 2110 # 3. In the remainder of the Territory, lying west of the 138th degree 2111 # longitude west, Yukon (West) Standard Time shall be reckoned as nine 2112 # hours behind Greenwich Time. 2113 # 2114 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2115 # https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2116 # C.O. 1973/214 INTERPRETATION ACT ... 2117 # 2118 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2119 # revoked. 2120 # 2121 # 2. Yukon Standard Time as defined by section 36 of the Interpretation 2122 # Act from and after midnight on the twenty-eighth day of October, 1973 2123 # shall be reckoned in the same manner as Pacific Standard Time, that is 2124 # to say eight hours behind Greenwich Time. 2125 # 2126 # * O.I.C. 1980/02 INTERPRETATION ACT 2127 # http://? - no online source found 2128 # 2129 # * Yukon Daylight Saving Time, YOIC 1987/56 2130 # https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2131 # O.I.C. 1987/056 INTERPRETATION ACT ... 2132 # 2133 # In every year between 2134 # (a) two o'clock in the morning in the first Sunday in April, and 2135 # (b) two o'clock in the morning in the last Sunday in October, 2136 # Standard Time shall be reckoned as seven hours behind Greenwich Time and 2137 # called Yukon Daylight Saving Time. 2138 # ... 2139 # Dated ... 9th day of March, A.D., 1987. 2140 # 2141 # * Yukon Daylight Saving Time 2006, YOIC 2006/127 2142 # https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2143 # O.I.C. 2006/127 INTERPRETATION ACT ... 2144 # 2145 # 1. In Yukon each year the time for general purposes shall be 7 hours 2146 # behind Greenwich mean time during the period commencing at two o'clock 2147 # in the forenoon on the second Sunday of March and ending at two o'clock 2148 # in the forenoon on the first Sunday of November and shall be called 2149 # Yukon Daylight Saving Time. 2150 # 2151 # 2. Order-in-Council 1987/56 is revoked. 2152 # 2153 # 3. This order comes into force January 1, 2007. 2154 # 2155 # * Interpretation Act, RSY 2002, c 125 2156 # https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2157 2158 # From Rives McDow (1999-09-04): 2159 # Nunavut ... moved ... to incorporate the whole territory into one time zone. 2160 # Nunavut moves to single time zone Oct. 31 2161 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2162 # 2163 # From Antoine Leca (1999-09-06): 2164 # We then need to create a new timezone for the Kitikmeot region of Nunavut 2165 # to differentiate it from the Yellowknife region. 2166 2167 # From Paul Eggert (1999-09-20): 2168 # Basic Facts: The New Territory 2169 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2170 # (1999) reports that Pangnirtung operates on eastern time, 2171 # and that Coral Harbour does not observe DST. We don't know when 2172 # Pangnirtung switched to eastern time; we'll guess 1995. 2173 2174 # From Rives McDow (1999-11-08): 2175 # On October 31, when the rest of Nunavut went to Central time, 2176 # Pangnirtung wobbled. Here is the result of their wobble: 2177 # 2178 # The following businesses and organizations in Pangnirtung use Central Time: 2179 # 2180 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 2181 # Eastern Arctic National Parks, A & D Specialist 2182 # 2183 # The following businesses and organizations in Pangnirtung use Eastern Time: 2184 # 2185 # Hamlet office, All other businesses, Both schools, Airport operator 2186 # 2187 # This has made for an interesting situation there, which warranted the news. 2188 # No one there that I spoke with seems concerned, or has plans to 2189 # change the local methods of keeping time, as it evidently does not 2190 # really interfere with any activities or make things difficult locally. 2191 # They plan to celebrate New Year's turn-over twice, one hour apart, 2192 # so it appears that the situation will last at least that long. 2193 # The Nunavut Intergovernmental Affairs hopes that they will "come to 2194 # their senses", but the locals evidently don't see any problem with 2195 # the current state of affairs. 2196 2197 # From Michaela Rodrigue, writing in the 2198 # Nunatsiaq News (1999-11-19): 2199 # http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html 2200 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 2201 # central - or Nunavut time - for government offices, and eastern time 2202 # for municipal offices and schools.... Igloolik [was similar but then] 2203 # made the switch to central time on Saturday, Nov. 6. 2204 2205 # From Paul Eggert (2000-10-02): 2206 # Matthews and Vincent (1998) say the following, but we lack histories 2207 # for these potential new Zones. 2208 # 2209 # The Canadian Forces station at Alert uses Eastern Time while the 2210 # handful of residents at the Eureka weather station [in the Central 2211 # zone] skip daylight savings. Baffin Island, which is crossed by the 2212 # Central, Eastern and Atlantic Time zones only uses Eastern Time. 2213 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2214 # Central Time and Southampton Island [in the Central zone] is not 2215 # required to use daylight savings. 2216 2217 # From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2218 # Nunavut now has two time zones (2000-11-10): 2219 # The Nunavut government would allow its employees in Kugluktuk and 2220 # Cambridge Bay to operate on central time year-round, putting them 2221 # one hour behind the rest of Nunavut for six months during the winter. 2222 # At the end of October the two communities had rebelled against 2223 # Nunavut's unified time zone, refusing to shift to eastern time with 2224 # the rest of the territory for the winter. Cambridge Bay remained on 2225 # central time, while Kugluktuk, even farther west, reverted to 2226 # mountain time, which they had used before the advent of Nunavut's 2227 # unified time zone in 1999. 2228 # 2229 # From Rives McDow (2001-01-20), quoting the Nunavut government: 2230 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2231 2232 # From Paul Eggert (2000-12-04): 2233 # Let's just keep track of the official times for now. 2234 2235 # From Rives McDow (2001-03-07): 2236 # The premier of Nunavut has issued a ministerial statement advising 2237 # that effective 2001-04-01, the territory of Nunavut will revert 2238 # back to three time zones (mountain, central, and eastern). Of the 2239 # cities in Nunavut, Coral Harbor is the only one that I know of that 2240 # has said it will not observe dst, staying on EST year round. I'm 2241 # checking for more info, and will get back to you if I come up with 2242 # more. 2243 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2244 2245 # From Gwillim Law (2005-05-21): 2246 # According to ... 2247 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2248 # (from a 1998 Canadian Geographic article), the de facto and de jure time 2249 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2250 # round. Using Google, it's easy to find other websites that confirm this. 2251 # I wasn't able to find how far back this time regimen goes, but since it 2252 # predates the creation of Nunavut, it probably goes back many years.... 2253 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2254 # 2255 # From Paul Eggert (2014-10-17): 2256 # For lack of better information, assume that Southampton Island observed 2257 # daylight saving only during wartime. Gwillim Law's email also 2258 # mentioned maps now maintained by National Research Council Canada; 2259 # see above for an up-to-date link. 2260 2261 # From Chris Walton (2007-03-01): 2262 # ... the community of Resolute (located on Cornwallis Island in 2263 # Nunavut) moved from Central Time to Eastern Time last November. 2264 # Basically the community did not change its clocks at the end of 2265 # daylight saving.... 2266 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2267 2268 # From Chris Walton (2011-03-21): 2269 # Back in 2007 I initiated the creation of a new "zone file" for Resolute 2270 # Bay. Resolute Bay is a small community located about 900km north of 2271 # the Arctic Circle. The zone file was required because Resolute Bay had 2272 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2273 # 2274 # According to new information which I received last week, Resolute Bay 2275 # went back to using UTC-6 in the winter of 2007-2008... 2276 # 2277 # On March 11/2007 most of Canada went onto daylight saving. On March 2278 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2279 # talked to somebody that was both knowledgeable and helpful. I was able 2280 # to confirm that Resolute Bay was still operating on UTC-5. It was 2281 # explained to me that Resolute Bay had been on the Eastern Time zone 2282 # (EST) in the winter, and was now back on the Central Time zone (CDT). 2283 # i.e. the time zone had changed twice in the last year but the clocks 2284 # had not moved. The residents had to know which time zone they were in 2285 # so they could follow the correct TV schedule... 2286 # 2287 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2288 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2289 # of the phone call, I decided to seek out an alternate source of 2290 # information. I found an e-mail address for somebody by the name of 2291 # Stephanie Adams whose job was listed as "Inns North Support Officer for 2292 # Arctic Co-operatives." I was under the impression that Stephanie lived 2293 # and worked in Resolute Bay... 2294 # 2295 # On March 14/2011 I phoned the hamlet office again. I was told that 2296 # Resolute Bay had been using Central Standard Time over the winter of 2297 # 2010-2011 and that the clocks had therefore been moved one hour ahead 2298 # on March 13/2011. The person I talked to was aware that Resolute Bay 2299 # had previously experimented with Eastern Standard Time but he could not 2300 # tell me when the practice had stopped. 2301 # 2302 # On March 17/2011 I searched the Web to find an e-mail address of 2303 # somebody that might be able to tell me exactly when Resolute Bay went 2304 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2305 # used to be the mayor of Resolute Bay and he apparently owns half the 2306 # businesses including "South Camp Inn." This website has some info on 2307 # Aziz: 2308 # http://www.uphere.ca/node/493 2309 # 2310 # I sent Aziz an e-mail asking when Resolute Bay had stopped using 2311 # Eastern Standard Time. 2312 # 2313 # Aziz responded quickly with this: "hi, The time was not changed for the 2314 # 1 year only, the following year, the community went back to the old way 2315 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2316 # the winter Zulu plus 6 hrs" 2317 # 2318 # This of course conflicted with everything I had ascertained in November 2008. 2319 # 2320 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2321 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2322 # may want to check with the weather office in Resolute Bay or do a 2323 # search on the weather through Env. Canada. web site" 2324 # 2325 # If I had realized the Stephanie did not live in Resolute Bay I would 2326 # never have contacted her. I now believe that all the information I 2327 # obtained in November 2008 should be ignored... 2328 # I apologize for reporting incorrect information in 2008. 2329 2330 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2331 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2332 Rule NT_YK 1918 only - Oct 27 2:00 0 S 2333 Rule NT_YK 1919 only - May 25 2:00 1:00 D 2334 Rule NT_YK 1919 only - Nov 1 0:00 0 S 2335 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2336 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2337 Rule NT_YK 1945 only - Sep 30 2:00 0 S 2338 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2339 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2340 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2341 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2342 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2343 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2344 # aka Panniqtuuq 2345 Zone America/Pangnirtung 0 - -00 1921 # trading post est. 2346 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2347 -5:00 Canada E%sT 1999 Oct 31 2:00 2348 -6:00 Canada C%sT 2000 Oct 29 2:00 2349 -5:00 Canada E%sT 2350 # formerly Frobisher Bay 2351 Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2352 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2353 -6:00 Canada C%sT 2000 Oct 29 2:00 2354 -5:00 Canada E%sT 2355 # aka Qausuittuq 2356 Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2357 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2358 -5:00 - EST 2001 Apr 1 3:00 2359 -6:00 Canada C%sT 2006 Oct 29 2:00 2360 -5:00 - EST 2007 Mar 11 3:00 2361 -6:00 Canada C%sT 2362 # aka Kangiqiniq 2363 Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2364 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2365 -5:00 - EST 2001 Apr 1 3:00 2366 -6:00 Canada C%sT 2367 # aka Iqaluktuuttiaq 2368 Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2369 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2370 -6:00 Canada C%sT 2000 Oct 29 2:00 2371 -5:00 - EST 2000 Nov 5 0:00 2372 -6:00 - CST 2001 Apr 1 3:00 2373 -7:00 Canada M%sT 2374 Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? 2375 -7:00 NT_YK M%sT 1980 2376 -7:00 Canada M%sT 2377 Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2378 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2379 -7:00 NT_YK M%sT 1980 2380 -7:00 Canada M%sT 2381 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2382 -9:00 NT_YK Y%sT 1967 May 28 0:00 2383 -8:00 NT_YK P%sT 1980 2384 -8:00 Canada P%sT 2385 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2386 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2387 -8:00 NT_YK P%sT 1980 2388 -8:00 Canada P%sT 2389 2390 2391 ############################################################################### 2392 2393 # Mexico 2394 2395 # From Paul Eggert (2014-12-07): 2396 # The Investigation and Analysis Service of the 2397 # Mexican Library of Congress (MLoC) has published a 2398 # history of Mexican local time (in Spanish) 2399 # http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2400 # 2401 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2402 # (In all cases we go with the MLoC.) 2403 # S&P report that Baja was at -8:00 in 1922/1923. 2404 # S&P say the 1930 transition in Baja was 1930-11-16. 2405 # S&P report no DST during summer 1931. 2406 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2407 2408 # From Gwillim Law (2001-02-20): 2409 # There are some other discrepancies between the Decrees page and the 2410 # tz database. I think they can best be explained by supposing that 2411 # the researchers who prepared the Decrees page failed to find some of 2412 # the relevant documents. 2413 2414 # From Alan Perry (1996-02-15): 2415 # A guy from our Mexico subsidiary finally found the Presidential Decree 2416 # outlining the timezone changes in Mexico. 2417 # 2418 # ------------- Begin Forwarded Message ------------- 2419 # 2420 # I finally got my hands on the Official Presidential Decree that sets up the 2421 # rules for the DST changes. The rules are: 2422 # 2423 # 1. The country is divided in 3 timezones: 2424 # - Baja California Norte (the Mexico/BajaNorte TZ) 2425 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2426 # - The rest of the country (the Mexico/General TZ) 2427 # 2428 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2429 # at 2:00 AM, the times in each zone are as follows: 2430 # BajaNorte: GMT+7 2431 # BajaSur: GMT+6 2432 # General: GMT+5 2433 # 2434 # 3. The rest of the year, the times are as follows: 2435 # BajaNorte: GMT+8 2436 # BajaSur: GMT+7 2437 # General: GMT+6 2438 # 2439 # The Decree was published in Mexico's Official Newspaper on January 4th. 2440 # 2441 # -------------- End Forwarded Message -------------- 2442 # From Paul Eggert (1996-06-12): 2443 # For an English translation of the decree, see 2444 # "Diario Oficial: Time Zone Changeover" (1996-01-04). 2445 # http://mexico-travel.com/extra/timezone_eng.html 2446 2447 # From Rives McDow (1998-10-08): 2448 # The State of Quintana Roo has reverted back to central STD and DST times 2449 # (i.e. UTC -0600 and -0500 as of 1998-08-02). 2450 2451 # From Rives McDow (2000-01-10): 2452 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2453 # zone 5 hours from the International Date Line, and will not observe daylight 2454 # savings time so as to stay on the same time zone as the southern part of 2455 # Arizona year round. 2456 2457 # From Jesper Nørgaard, translating 2458 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2459 # In Oaxaca, the 55.000 teachers from the Section 22 of the National 2460 # Syndicate of Education Workers, refuse to apply daylight saving each 2461 # year, so that the more than 10,000 schools work at normal hour the 2462 # whole year. 2463 2464 # From Gwillim Law (2001-01-19): 2465 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2466 # (translated):... 2467 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2468 # that Summer Time will be reduced from seven to five months, starting 2469 # this year.... 2470 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2471 # [translated], says "summer time will ... take effect on the first Sunday 2472 # in May, and end on the last Sunday of September. 2473 2474 # From Arthur David Olson (2001-01-25): 2475 # The 2001-01-24 traditional Washington Post contained the page one 2476 # story "Timely Issue Divides Mexicans."... 2477 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2478 # ... Mexico City Mayor López Obrador "...is threatening to keep 2479 # Mexico City and its 20 million residents on a different time than 2480 # the rest of the country..." In particular, López Obrador would abolish 2481 # observation of Daylight Saving Time. 2482 2483 # Official statute published by the Energy Department 2484 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2485 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2486 # and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2487 2488 # From Paul Eggert (2001-03-03): 2489 # 2490 # http://www.latimes.com/news/nation/20010303/t000018766.html 2491 # James F. Smith writes in today's LA Times 2492 # * Sonora will continue to observe standard time. 2493 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2494 # the Federal District will not adopt DST. 2495 # * 4 of 16 district leaders announced they'll ignore the decree. 2496 # * The decree does not affect federal-controlled facilities including 2497 # the airport, banks, hospitals, and schools. 2498 # 2499 # For now we'll assume that the Federal District will bow to federal rules. 2500 2501 # From Jesper Nørgaard (2001-04-01): 2502 # I found some references to the Mexican application of daylight 2503 # saving, which modifies what I had already sent you, stating earlier 2504 # that a number of northern Mexican states would go on daylight 2505 # saving. The modification reverts this to only cover Baja California 2506 # (Norte), while all other states (except Sonora, who has no daylight 2507 # saving all year) will follow the original decree of president 2508 # Vicente Fox, starting daylight saving May 6, 2001 and ending 2509 # September 30, 2001. 2510 # References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2511 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2512 2513 # From Reuters (2001-09-04): 2514 # Mexico's Supreme Court on Tuesday declared that daylight savings was 2515 # unconstitutional in Mexico City, creating the possibility the 2516 # capital will be in a different time zone from the rest of the nation 2517 # next year.... The Supreme Court's ruling takes effect at 2:00 2518 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2519 # standard time. "This is so residents of the Federal District are not 2520 # subject to unexpected time changes," a statement from the court said. 2521 2522 # From Jesper Nørgaard Welen (2002-03-12): 2523 # ... consulting my local grocery store(!) and my coworkers, they all insisted 2524 # that a new decision had been made to reinstate US style DST in Mexico.... 2525 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2526 # confirms this. Sonora as usual is the only state where DST is not applied. 2527 2528 # From Steffen Thorsen (2009-12-28): 2529 # 2530 # Steffen Thorsen wrote: 2531 # > Mexico's House of Representatives has approved a proposal for northern 2532 # > Mexico's border cities to share the same daylight saving schedule as 2533 # > the United States. 2534 # Now this has passed both the Congress and the Senate, so starting from 2535 # 2010, some border regions will be the same: 2536 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2537 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2538 # (Spanish) 2539 # 2540 # Could not find the new law text, but the proposed law text changes are here: 2541 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2542 # (Gaceta Parlamentaria) 2543 # 2544 # There is also a list of the votes here: 2545 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2546 # 2547 # Our page: 2548 # https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2549 2550 # From Arthur David Olson (2010-01-20): 2551 # The page 2552 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2553 # includes this text: 2554 # En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2555 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2556 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2557 # Tamaulipas, la aplicación de este horario estacional surtirá efecto 2558 # desde las dos horas del segundo domingo de marzo y concluirá a las dos 2559 # horas del primer domingo de noviembre. 2560 # En los municipios fronterizos que se encuentren ubicados en la franja 2561 # fronteriza norte en el territorio comprendido entre la línea 2562 # internacional y la línea paralela ubicada a una distancia de veinte 2563 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2564 # interior del país, la aplicación de este horario estacional surtirá 2565 # efecto desde las dos horas del segundo domingo de marzo y concluirá a 2566 # las dos horas del primer domingo de noviembre. 2567 2568 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2569 # The Mexican state of Quintana Roo will likely change to EST in 2015. 2570 # 2571 # http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2572 # "With this change, the time conflict that has existed between the municipios 2573 # of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2574 # end. The latter declared itself in rebellion 15 years ago when a time change 2575 # was initiated in Mexico, and since then it has refused to change its time 2576 # zone along with the rest of the country." 2577 # 2578 # From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2579 # http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2580 # "...the new time zone will come into effect at two o'clock on the first Sunday 2581 # of February, when we will have to advance the clock one hour from its current 2582 # time..." 2583 # Also, the new zone will not use DST. 2584 # 2585 # From Carlos Raúl Perasso (2015-02-02): 2586 # The decree that modifies the Mexican Hour System Law has finally 2587 # been published at the Diario Oficial de la Federación 2588 # http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2589 # It establishes 5 zones for Mexico: 2590 # 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2591 # includes most of Mexico, excluding what's mentioned below. 2592 # 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2593 # states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2594 # de Banderas which lies in Central Zone); Sinaloa and Sonora. 2595 # 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2596 # state of Baja California. 2597 # 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2598 # of Quintana Roo. 2599 # 5- The islands, reefs and keys shall take their timezone from the 2600 # longitude they are located at. 2601 2602 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2603 Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2604 Rule Mexico 1939 only - Jun 25 0:00 0 S 2605 Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2606 Rule Mexico 1941 only - Apr 1 0:00 0 S 2607 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2608 Rule Mexico 1944 only - May 1 0:00 0 S 2609 Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2610 Rule Mexico 1950 only - Jul 30 0:00 0 S 2611 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2612 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2613 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2614 Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2615 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2616 Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2617 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2618 # Quintana Roo; represented by Cancún 2619 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2620 -6:00 - CST 1981 Dec 23 2621 -5:00 Mexico E%sT 1998 Aug 2 2:00 2622 -6:00 Mexico C%sT 2015 Feb 1 2:00 2623 -5:00 - EST 2624 # Campeche, Yucatán; represented by Mérida 2625 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2626 -6:00 - CST 1981 Dec 23 2627 -5:00 - EST 1982 Dec 2 2628 -6:00 Mexico C%sT 2629 # Coahuila, Nuevo León, Tamaulipas (near US border) 2630 # This includes the following municipalities: 2631 # in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, 2632 # Guerrero, Hidalgo. 2633 # in Nuevo León: Anáhuac, Los Aldama. 2634 # in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2635 # Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2636 # See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, 2637 # 2016-03-12 2638 # http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza 2639 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2640 -6:00 - CST 1988 2641 -6:00 US C%sT 1989 2642 -6:00 Mexico C%sT 2010 2643 -6:00 US C%sT 2644 # Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2645 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2646 -6:00 - CST 1988 2647 -6:00 US C%sT 1989 2648 -6:00 Mexico C%sT 2649 # Central Mexico 2650 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2651 -7:00 - MST 1927 Jun 10 23:00 2652 -6:00 - CST 1930 Nov 15 2653 -7:00 - MST 1931 May 1 23:00 2654 -6:00 - CST 1931 Oct 2655 -7:00 - MST 1932 Apr 1 2656 -6:00 Mexico C%sT 2001 Sep 30 2:00 2657 -6:00 - CST 2002 Feb 20 2658 -6:00 Mexico C%sT 2659 # Chihuahua (near US border) 2660 # This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, 2661 # Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. 2662 # (See the 2016-03-12 El Universal source mentioned above.) 2663 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2664 -7:00 - MST 1927 Jun 10 23:00 2665 -6:00 - CST 1930 Nov 15 2666 -7:00 - MST 1931 May 1 23:00 2667 -6:00 - CST 1931 Oct 2668 -7:00 - MST 1932 Apr 1 2669 -6:00 - CST 1996 2670 -6:00 Mexico C%sT 1998 2671 -6:00 - CST 1998 Apr Sun>=1 3:00 2672 -7:00 Mexico M%sT 2010 2673 -7:00 US M%sT 2674 # Chihuahua (away from US border) 2675 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2676 -7:00 - MST 1927 Jun 10 23:00 2677 -6:00 - CST 1930 Nov 15 2678 -7:00 - MST 1931 May 1 23:00 2679 -6:00 - CST 1931 Oct 2680 -7:00 - MST 1932 Apr 1 2681 -6:00 - CST 1996 2682 -6:00 Mexico C%sT 1998 2683 -6:00 - CST 1998 Apr Sun>=1 3:00 2684 -7:00 Mexico M%sT 2685 # Sonora 2686 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2687 -7:00 - MST 1927 Jun 10 23:00 2688 -6:00 - CST 1930 Nov 15 2689 -7:00 - MST 1931 May 1 23:00 2690 -6:00 - CST 1931 Oct 2691 -7:00 - MST 1932 Apr 1 2692 -6:00 - CST 1942 Apr 24 2693 -7:00 - MST 1949 Jan 14 2694 -8:00 - PST 1970 2695 -7:00 Mexico M%sT 1999 2696 -7:00 - MST 2697 2698 # From Alexander Krivenyshev (2010-04-21): 2699 # According to news, Bahía de Banderas (Mexican state of Nayarit) 2700 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2701 # share the same time zone as nearby city Puerto Vallarta, Jalisco). 2702 # 2703 # (Spanish) 2704 # Bahía de Banderas homologa su horario al del centro del 2705 # país, a partir de este domingo 2706 # http://www.nayarit.gob.mx/notes.asp?id=20748 2707 # 2708 # Bahía de Banderas homologa su horario con el del Centro del 2709 # País 2710 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50 2711 # 2712 # (English) 2713 # Puerto Vallarta and Bahía de Banderas: One Time Zone 2714 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2715 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2716 # 2717 # "Mexico's Senate approved the amendments to the Mexican Schedule System that 2718 # will allow Bahía de Banderas and Puerto Vallarta to share the same time 2719 # zone ..." 2720 # Baja California Sur, Nayarit, Sinaloa 2721 2722 # From Arthur David Olson (2010-05-01): 2723 # Use "Bahia_Banderas" to keep the name to fourteen characters. 2724 2725 # Mazatlán 2726 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2727 -7:00 - MST 1927 Jun 10 23:00 2728 -6:00 - CST 1930 Nov 15 2729 -7:00 - MST 1931 May 1 23:00 2730 -6:00 - CST 1931 Oct 2731 -7:00 - MST 1932 Apr 1 2732 -6:00 - CST 1942 Apr 24 2733 -7:00 - MST 1949 Jan 14 2734 -8:00 - PST 1970 2735 -7:00 Mexico M%sT 2736 2737 # Bahía de Banderas 2738 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2739 -7:00 - MST 1927 Jun 10 23:00 2740 -6:00 - CST 1930 Nov 15 2741 -7:00 - MST 1931 May 1 23:00 2742 -6:00 - CST 1931 Oct 2743 -7:00 - MST 1932 Apr 1 2744 -6:00 - CST 1942 Apr 24 2745 -7:00 - MST 1949 Jan 14 2746 -8:00 - PST 1970 2747 -7:00 Mexico M%sT 2010 Apr 4 2:00 2748 -6:00 Mexico C%sT 2749 2750 # Baja California 2751 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2752 -7:00 - MST 1924 2753 -8:00 - PST 1927 Jun 10 23:00 2754 -7:00 - MST 1930 Nov 15 2755 -8:00 - PST 1931 Apr 1 2756 -8:00 1:00 PDT 1931 Sep 30 2757 -8:00 - PST 1942 Apr 24 2758 -8:00 1:00 PWT 1945 Aug 14 23:00u 2759 -8:00 1:00 PPT 1945 Nov 12 # Peace 2760 -8:00 - PST 1948 Apr 5 2761 -8:00 1:00 PDT 1949 Jan 14 2762 -8:00 - PST 1954 2763 -8:00 CA P%sT 1961 2764 -8:00 - PST 1976 2765 -8:00 US P%sT 1996 2766 -8:00 Mexico P%sT 2001 2767 -8:00 US P%sT 2002 Feb 20 2768 -8:00 Mexico P%sT 2010 2769 -8:00 US P%sT 2770 # From Paul Eggert (2006-03-22): 2771 # Formerly there was an America/Ensenada zone, which differed from 2772 # America/Tijuana only in that it did not observe DST from 1976 2773 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2774 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2775 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2776 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2777 # DST-observance was a town-by-town matter back then. This concerns 2778 # data after 1970 so most likely there should be at least one Zone 2779 # other than America/Tijuana for Baja, but it's not clear yet what its 2780 # name or contents should be. 2781 # 2782 # From Paul Eggert (2015-10-08): 2783 # Formerly there was an America/Santa_Isabel zone, but this appears to 2784 # have come from a misreading of 2785 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2786 # It has been moved to the 'backward' file. 2787 # 2788 # 2789 # Revillagigedo Is 2790 # no information 2791 2792 ############################################################################### 2793 2794 # Anguilla 2795 # Antigua and Barbuda 2796 # See America/Port_of_Spain. 2797 2798 # Bahamas 2799 # 2800 # For 1899 Milne gives -5:09:29.5; round that. 2801 # 2802 # From Sue Williams (2006-12-07): 2803 # The Bahamas announced about a month ago that they plan to change their DST 2804 # rules to sync with the U.S. starting in 2007.... 2805 # http://www.jonesbahamas.com/?c=45&a=10412 2806 2807 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2808 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2809 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2810 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2811 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2812 -5:00 Bahamas E%sT 1976 2813 -5:00 US E%sT 2814 2815 # Barbados 2816 2817 # For 1899 Milne gives -3:58:29.2; round that. 2818 2819 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2820 Rule Barb 1977 only - Jun 12 2:00 1:00 D 2821 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2822 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2823 Rule Barb 1979 only - Sep 30 2:00 0 S 2824 Rule Barb 1980 only - Sep 25 2:00 0 S 2825 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2826 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown 2827 -3:58:29 - BMT 1932 # Bridgetown Mean Time 2828 -4:00 Barb A%sT 2829 2830 # Belize 2831 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2832 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2833 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530 2834 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST 2835 Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2836 Rule Belize 1974 only - Feb 9 0:00 0 CST 2837 Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2838 Rule Belize 1983 only - Feb 12 0:00 0 CST 2839 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2840 Zone America/Belize -5:52:48 - LMT 1912 Apr 2841 -6:00 Belize %s 2842 2843 # Bermuda 2844 2845 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2846 # Bermuda dockyard, Ireland I; round that. 2847 2848 # From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2849 2850 # Next year, however, clocks in the US will go forward on the second Sunday 2851 # in March, until the first Sunday in November. And, after the Time Zone 2852 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 2853 # Friday, the same thing will happen in Bermuda. 2854 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 2855 2856 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2857 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton 2858 -4:00 - AST 1974 Apr 28 2:00 2859 -4:00 Canada A%sT 1976 2860 -4:00 US A%sT 2861 2862 # Cayman Is 2863 # See America/Panama. 2864 2865 # Costa Rica 2866 2867 # Milne gives -5:36:13.3 as San José mean time; round to nearest. 2868 2869 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2870 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 2871 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 2872 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 2873 # IATA SSIM (1991-09) says the following was at 1:00; 2874 # go with Shanks & Pottenger. 2875 Rule CR 1991 only - Jul 1 0:00 0 S 2876 Rule CR 1992 only - Mar 15 0:00 0 S 2877 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 2878 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2879 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 2880 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 2881 -6:00 CR C%sT 2882 # Coco 2883 # no information; probably like America/Costa_Rica 2884 2885 # Cuba 2886 2887 # From Paul Eggert (2013-02-21): 2888 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 2889 # for the port, and -5:30 for meteorological observations. 2890 # For now, stick with Shanks & Pottenger. 2891 2892 # From Arthur David Olson (1999-03-29): 2893 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 2894 # the Cuban National Team and the Baltimore Orioles was carried live on 2895 # the Orioles Radio Network, including affiliate WTOP in Washington, DC. 2896 # During the game, play-by-play announcer Jim Hunter noted that 2897 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 2898 # Time today." (The "two hour" remark referred to losing one hour of 2899 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched 2900 # to DST - and one more hour on 1999-04-04 - when the announcers will have 2901 # returned to Baltimore, which switches on that date.) 2902 2903 # From Steffen Thorsen (2013-11-11): 2904 # DST start in Cuba in 2004 ... does not follow the same rules as the 2905 # years before. The correct date should be Sunday 2004-03-28 00:00 ... 2906 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 2907 2908 # From Evert van der Veer via Steffen Thorsen (2004-10-28): 2909 # Cuba is not going back to standard time this year. 2910 # From Paul Eggert (2006-03-22): 2911 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2912 # says that it's due to a problem at the Antonio Guiteras 2913 # thermoelectric plant, and says "This October there will be no return 2914 # to normal hours (after daylight saving time)". 2915 # For now, let's assume that it's a temporary measure. 2916 2917 # From Carlos A. Carnero Delgado (2005-11-12): 2918 # This year (just like in 2004-2005) there's no change in time zone 2919 # adjustment in Cuba. We will stay in daylight saving time: 2920 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2921 2922 # From Jesper Nørgaard Welen (2006-10-21): 2923 # An article in GRANMA INTERNACIONAL claims that Cuba will end 2924 # the 3 years of permanent DST next weekend, see 2925 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 2926 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 2927 # watches should be set back one hour - going back to 00:00 hours - returning 2928 # to the normal schedule.... 2929 2930 # From Paul Eggert (2007-03-02): 2931 # <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 2932 # says Cuban clocks will advance at midnight on March 10. 2933 # For lack of better information, assume Cuba will use US rules, 2934 # except that it switches at midnight standard time as usual. 2935 # 2936 # From Steffen Thorsen (2007-10-25): 2937 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 2938 # earlier - on the last Sunday of October, just like in 2006. 2939 # 2940 # He supplied these references: 2941 # 2942 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 2943 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 2944 # 2945 # From Alex Krivenyshev (2007-10-25): 2946 # Here is also article from Granma (Cuba): 2947 # 2948 # Regirá el Horario Normal desde el próximo domingo 28 de octubre 2949 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 2950 # 2951 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 2952 2953 # From Arthur David Olson (2008-03-09): 2954 # I'm in Maryland which is now observing United States Eastern Daylight 2955 # Time. At 9:44 local time I used RealPlayer to listen to 2956 # http://media.enet.cu/radioreloj 2957 # a Cuban information station, and heard 2958 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 2959 # indicating that Cuba is still on standard time. 2960 2961 # From Steffen Thorsen (2008-03-12): 2962 # It seems that Cuba will start DST on Sunday, 2007-03-16... 2963 # It was announced yesterday, according to this source (in Spanish): 2964 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 2965 # 2966 # Some more background information is posted here: 2967 # https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 2968 # 2969 # The article also says that Cuba has been observing DST since 1963, 2970 # while Shanks (and tzdata) has 1965 as the first date (except in the 2971 # 1940's). Many other web pages in Cuba also claim that it has been 2972 # observed since 1963, but with the exception of 1970 - an exception 2973 # which is not present in tzdata/Shanks. So there is a chance we need to 2974 # change some historic records as well. 2975 # 2976 # One example: 2977 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 2978 2979 # From Jesper Nørgaard Welen (2008-03-13): 2980 # The Cuban time change has just been confirmed on the most authoritative 2981 # web site, the Granma. Please check out 2982 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 2983 # 2984 # Basically as expected after Steffen Thorsen's information, the change 2985 # will take place midnight between Saturday and Sunday. 2986 2987 # From Arthur David Olson (2008-03-12): 2988 # Assume Sun>=15 (third Sunday) going forward. 2989 2990 # From Alexander Krivenyshev (2009-03-04) 2991 # According to the Radio Reloj - Cuba will start Daylight Saving Time on 2992 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 2993 # not on midnight March 14 / March 15 as previously thought. 2994 # 2995 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 2996 # (in Spanish) 2997 2998 # From Arthur David Olson (2009-03-09) 2999 # I listened over the Internet to 3000 # http://media.enet.cu/readioreloj 3001 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3002 # the time was announced as "diez cinco" - the same time as here, indicating 3003 # that has indeed switched to DST. Assume second Sunday from 2009 forward. 3004 3005 # From Steffen Thorsen (2011-03-08): 3006 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3007 # this year. Nothing about the end date known so far (if that has 3008 # changed at all). 3009 # 3010 # Source: 3011 # http://granma.co.cu/2011/03/08/nacional/artic01.html 3012 # 3013 # Our info: 3014 # https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3015 # 3016 # From Steffen Thorsen (2011-10-30) 3017 # Cuba will end DST two weeks later this year. Instead of going back 3018 # tonight, it has been delayed to 2011-11-13 at 01:00. 3019 # 3020 # One source (Spanish) 3021 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3022 # 3023 # Our page: 3024 # https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3025 # 3026 # From Steffen Thorsen (2012-03-01) 3027 # According to Radio Reloj, Cuba will start DST on Midnight between March 3028 # 31 and April 1. 3029 # 3030 # Radio Reloj has the following info (Spanish): 3031 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3032 # 3033 # Our info on it: 3034 # https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3035 3036 # From Steffen Thorsen (2012-11-03): 3037 # Radio Reloj and many other sources report that Cuba is changing back 3038 # to standard time on 2012-11-04: 3039 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3040 # From Paul Eggert (2012-11-03): 3041 # For now, assume the future rule is first Sunday in November. 3042 3043 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3044 Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3045 Rule Cuba 1928 only - Oct 10 0:00 0 S 3046 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3047 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3048 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3049 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3050 Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3051 Rule Cuba 1965 only - Sep 30 0:00 0 S 3052 Rule Cuba 1966 only - May 29 0:00 1:00 D 3053 Rule Cuba 1966 only - Oct 2 0:00 0 S 3054 Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3055 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3056 Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3057 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3058 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3059 Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3060 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3061 Rule Cuba 1978 only - May 7 0:00 1:00 D 3062 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3063 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3064 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3065 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3066 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3067 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3068 Rule Cuba 1996 only - Oct 6 0:00s 0 S 3069 Rule Cuba 1997 only - Oct 12 0:00s 0 S 3070 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3071 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3072 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3073 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3074 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3075 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3076 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3077 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3078 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3079 Rule Cuba 2011 only - Nov 13 0:00s 0 S 3080 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3081 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3082 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3083 3084 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3085 Zone America/Havana -5:29:28 - LMT 1890 3086 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3087 -5:00 Cuba C%sT 3088 3089 # Dominica 3090 # See America/Port_of_Spain. 3091 3092 # Dominican Republic 3093 3094 # From Steffen Thorsen (2000-10-30): 3095 # Enrique Morales reported to me that the Dominican Republic has changed the 3096 # time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3097 # http://www.listin.com.do/antes/261000/republica/princi.html 3098 3099 # From Paul Eggert (2000-12-04): 3100 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3101 3102 # From Rives McDow (2000-12-01): 3103 # Dominican Republic changed its mind and presidential decree on Tuesday, 3104 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3105 # Dominican Republic will be reverting to 8 hours from the International Date 3106 # Line, and will not be using DST in the foreseeable future. The reason they 3107 # decided to use DST was to be in synch with Puerto Rico, who was also going 3108 # to implement DST. When Puerto Rico didn't implement DST, the president 3109 # decided to revert. 3110 3111 3112 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3113 Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3114 Rule DR 1967 only - Feb 28 0:00 0 EST 3115 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3116 Rule DR 1970 only - Feb 21 0:00 0 EST 3117 Rule DR 1971 only - Jan 20 0:00 0 EST 3118 Rule DR 1972 1974 - Jan 21 0:00 0 EST 3119 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3120 Zone America/Santo_Domingo -4:39:36 - LMT 1890 3121 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3122 -5:00 DR %s 1974 Oct 27 3123 -4:00 - AST 2000 Oct 29 2:00 3124 -5:00 US E%sT 2000 Dec 3 1:00 3125 -4:00 - AST 3126 3127 # El Salvador 3128 3129 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3130 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3131 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3132 # There are too many San Salvadors elsewhere, so use America/El_Salvador 3133 # instead of America/San_Salvador. 3134 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3135 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3136 -6:00 Salv C%sT 3137 3138 # Grenada 3139 # Guadeloupe 3140 # St Barthélemy 3141 # St Martin (French part) 3142 # See America/Port_of_Spain. 3143 3144 # Guatemala 3145 # 3146 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3147 # Diario Co Latino, at 3148 # <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3149 # says in an article dated 2006-04-19 that the Guatemalan government had 3150 # decided on that date to advance official time by 60 minutes, to lessen the 3151 # impact of the elevated cost of oil.... Daylight saving time will last from 3152 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3153 # From Paul Eggert (2006-06-22): 3154 # The Ministry of Energy and Mines, press release CP-15/2006 3155 # (2006-04-19), says DST ends at 24:00. See 3156 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3157 3158 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3159 Rule Guat 1973 only - Nov 25 0:00 1:00 D 3160 Rule Guat 1974 only - Feb 24 0:00 0 S 3161 Rule Guat 1983 only - May 21 0:00 1:00 D 3162 Rule Guat 1983 only - Sep 22 0:00 0 S 3163 Rule Guat 1991 only - Mar 23 0:00 1:00 D 3164 Rule Guat 1991 only - Sep 7 0:00 0 S 3165 Rule Guat 2006 only - Apr 30 0:00 1:00 D 3166 Rule Guat 2006 only - Oct 1 0:00 0 S 3167 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3168 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3169 -6:00 Guat C%sT 3170 3171 # Haiti 3172 # From Gwillim Law (2005-04-15): 3173 # Risto O. Nykänen wrote me that Haiti is now on DST. 3174 # I searched for confirmation, and I found a press release 3175 # on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3176 # <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3177 # 3178 # "The Prime Minister's Communication Office notifies the public in general 3179 # and the press in particular that, following a decision of the Interior 3180 # Ministry and the Territorial Collectivities [I suppose that means the 3181 # provinces], Haiti will move to Eastern Daylight Time in the night from next 3182 # Saturday the 2nd to Sunday the 3rd. 3183 # 3184 # "Consequently, the Prime Minister's Communication Office wishes to inform 3185 # the population that the country's clocks will be set forward one hour 3186 # starting at midnight. This provision will hold until the last Saturday in 3187 # October 2005. 3188 # 3189 # "Port-au-Prince, March 31, 2005" 3190 # 3191 # From Steffen Thorsen (2006-04-04): 3192 # I have been informed by users that Haiti observes DST this year like 3193 # last year, so the current "only" rule for 2005 might be changed to a 3194 # "max" rule or to last until 2006. (Who knows if they will observe DST 3195 # next year or if they will extend their DST like US/Canada next year). 3196 # 3197 # I have found this article about it (in French): 3198 # http://www.haitipressnetwork.com/news.cfm?articleID=7612 3199 # 3200 # The reason seems to be an energy crisis. 3201 3202 # From Stephen Colebourne (2007-02-22): 3203 # Some IATA info: Haiti won't be having DST in 2007. 3204 3205 # From Steffen Thorsen (2012-03-11): 3206 # According to several news sources, Haiti will observe DST this year, 3207 # apparently using the same start and end date as USA/Canada. 3208 # So this means they have already changed their time. 3209 # 3210 # http://www.alterpresse.org/spip.php?article12510 3211 # http://radiovision2000haiti.net/home/?p=13253 3212 # 3213 # From Arthur David Olson (2012-03-11): 3214 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3215 # 3:00 a.m. rather than the traditional Haitian jump at midnight. 3216 # Assume a US-style fall back as well. 3217 3218 # From Steffen Thorsen (2013-03-10): 3219 # It appears that Haiti is observing DST this year as well, same rules 3220 # as US/Canada. They did it last year as well, and it looks like they 3221 # are going to observe DST every year now... 3222 # 3223 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3224 # http://www.canalplushaiti.net/?p=6714 3225 3226 # From Steffen Thorsen (2016-03-12): 3227 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3228 # are not going on DST this year. Several other resources confirm this: ... 3229 # https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3230 # https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3231 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3232 3233 # From Steffen Thorsen (2017-03-12): 3234 # We have received 4 mails from different people telling that Haiti 3235 # has started DST again today, and this source seems to confirm that, 3236 # I have not been able to find a more authoritative source: 3237 # https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3238 3239 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3240 Rule Haiti 1983 only - May 8 0:00 1:00 D 3241 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3242 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3243 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3244 # Go with IATA. 3245 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3246 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3247 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3248 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3249 Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3250 Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3251 Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3252 Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3253 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3254 Zone America/Port-au-Prince -4:49:20 - LMT 1890 3255 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3256 -5:00 Haiti E%sT 3257 3258 # Honduras 3259 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3260 3261 # From Paul Eggert (2006-05-05): 3262 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3263 # saying Honduras will start using DST midnight Saturday, effective 4 3264 # months until September. La Tribuna reported today 3265 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3266 # of Honduras, refused to back down on this. 3267 3268 # From Jesper Nørgaard Welen (2006-08-08): 3269 # It seems that Honduras has returned from DST to standard time this Monday at 3270 # 00:00 hours (prolonging Sunday to 25 hours duration). 3271 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3272 3273 # From Paul Eggert (2006-08-08): 3274 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3275 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3276 # It mentions executive decree 18-2006. 3277 3278 # From Steffen Thorsen (2006-08-17): 3279 # Honduras will observe DST from 2007 to 2009, exact dates are not 3280 # published, I have located this authoritative source: 3281 # http://www.presidencia.gob.hn/noticia.aspx?nId=47 3282 3283 # From Steffen Thorsen (2007-03-30): 3284 # http://www.laprensahn.com/pais_nota.php?id04962=7386 3285 # So it seems that Honduras will not enter DST this year.... 3286 3287 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3288 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3289 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3290 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3291 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3292 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3293 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3294 -6:00 Hond C%sT 3295 # 3296 # Great Swan I ceded by US to Honduras in 1972 3297 3298 # Jamaica 3299 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3300 # unspecified official document, and says "This time is used throughout the 3301 # island". Go with Milne. Round to the nearest second as required by zic. 3302 # 3303 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3304 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3305 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3306 # Manley's supporters associated this act with Manley's nickname "Joshua" 3307 # (recall that in the Bible the sun stood still at Joshua's request), 3308 # and with the Rod of Correction which Manley said he had received from 3309 # Haile Selassie, Emperor of Ethiopia. See: 3310 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3311 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3312 # 3313 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3314 Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3315 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3316 -5:00 - EST 1974 3317 -5:00 US E%sT 1984 3318 -5:00 - EST 3319 3320 # Martinique 3321 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3322 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3323 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3324 -4:00 - AST 1980 Apr 6 3325 -4:00 1:00 ADT 1980 Sep 28 3326 -4:00 - AST 3327 3328 # Montserrat 3329 # See America/Port_of_Spain. 3330 3331 # Nicaragua 3332 # 3333 # This uses Shanks & Pottenger for times before 2005. 3334 # 3335 # From Steffen Thorsen (2005-04-12): 3336 # I've got reports from 8 different people that Nicaragua just started 3337 # DST on Sunday 2005-04-10, in order to save energy because of 3338 # expensive petroleum. The exact end date for DST is not yet 3339 # announced, only "September" but some sites also say "mid-September". 3340 # Some background information is available on the President's official site: 3341 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3342 # The Decree, no 23-2005 is available here: 3343 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf 3344 # 3345 # From Paul Eggert (2005-05-01): 3346 # The decree doesn't say anything about daylight saving, but for now let's 3347 # assume that it is daylight saving.... 3348 # 3349 # From Gwillim Law (2005-04-21): 3350 # The Associated Press story on the time change, which can be found at 3351 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3352 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3353 # time that a change of clocks was applied to save energy was in the year 2000 3354 # during the Arnoldo Alemán administration."... 3355 # The northamerica file says that Nicaragua has been on UTC-6 continuously 3356 # since December 1998. I wasn't able to find any details of Nicaraguan time 3357 # changes in 2000. Perhaps a note could be added to the northamerica file, to 3358 # the effect that we have indirect evidence that DST was observed in 2000. 3359 # 3360 # From Jesper Nørgaard Welen (2005-11-02): 3361 # Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3362 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3363 # (2005-09-26) 3364 # 3365 # From Jesper Nørgaard Welen (2006-05-05): 3366 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3367 # (my informal translation) 3368 # By order of the president of the republic, Enrique Bolaños, Nicaragua 3369 # advanced by sixty minutes their official time, yesterday at 2 in the 3370 # morning, and will stay that way until 30th of September. 3371 # 3372 # From Jesper Nørgaard Welen (2006-09-30): 3373 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3374 # My informal translation runs: 3375 # The natural sun time is restored in all the national territory, in that the 3376 # time is returned one hour at 01:00 am of October 1 of 2006. 3377 # 3378 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3379 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3380 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3381 Rule Nic 2005 only - Apr 10 0:00 1:00 D 3382 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3383 Rule Nic 2006 only - Apr 30 2:00 1:00 D 3384 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3385 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3386 Zone America/Managua -5:45:08 - LMT 1890 3387 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3388 -6:00 - CST 1973 May 3389 -5:00 - EST 1975 Feb 16 3390 -6:00 Nic C%sT 1992 Jan 1 4:00 3391 -5:00 - EST 1992 Sep 24 3392 -6:00 - CST 1993 3393 -5:00 - EST 1997 3394 -6:00 Nic C%sT 3395 3396 # Panama 3397 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3398 Zone America/Panama -5:18:08 - LMT 1890 3399 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3400 -5:00 - EST 3401 Link America/Panama America/Cayman 3402 3403 # Puerto Rico 3404 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3405 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3406 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3407 -4:00 - AST 1942 May 3 3408 -4:00 US A%sT 1946 3409 -4:00 - AST 3410 3411 # St Kitts-Nevis 3412 # St Lucia 3413 # See America/Port_of_Spain. 3414 3415 # St Pierre and Miquelon 3416 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3417 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3418 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3419 -4:00 - AST 1980 May 3420 -3:00 - -03 1987 3421 -3:00 Canada -03/-02 3422 3423 # St Vincent and the Grenadines 3424 # See America/Port_of_Spain. 3425 3426 # Turks and Caicos 3427 # 3428 # From Chris Dunn in 3429 # https://bugs.debian.org/415007 3430 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3431 # daylight saving dates for time changes have been adjusted to match 3432 # the recent U.S. change of dates. 3433 # 3434 # From Brian Inglis (2007-04-28): 3435 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3436 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3437 # rows before that there is an out of date entry for Oct: 3438 # "Eastern Standard Times Begins 2007 3439 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3440 # indicating that the normal ET rules are followed. 3441 # 3442 # From Paul Eggert (2014-08-19): 3443 # The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3444 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3445 # Model this as a switch from EST/EDT to AST ... 3446 # From Chris Walton (2014-11-04): 3447 # ... the TCI government appears to have delayed the switch to 3448 # "permanent daylight saving time" by one year.... 3449 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3450 # 3451 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3452 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3453 # during the summer months and Standard Time, also known as Local 3454 # Time, during the winter months with effect from April 2018 ... 3455 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3456 # 3457 # From Paul Eggert (2017-08-26): 3458 # The date of effect of the spring 2018 change appears to be March 11, 3459 # which makes more sense. See: Hamilton D. Time change back 3460 # by March 2018 for TCI. Magnetic Media. 2017-08-25. 3461 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3462 # 3463 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3464 Zone America/Grand_Turk -4:44:32 - LMT 1890 3465 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3466 -5:00 - EST 1979 3467 -5:00 US E%sT 2015 Nov Sun>=1 2:00 3468 -4:00 - AST 2018 Mar 11 3:00 3469 -5:00 US E%sT 3470 3471 # British Virgin Is 3472 # Virgin Is 3473 # See America/Port_of_Spain. 3474 3475 3476 # Local Variables: 3477 # coding: utf-8 3478 # End: