1 # This file is in the public domain, so clarified as of
2 # 2009-05-17 by Arthur David Olson.
4 # This file is by no means authoritative; if you think you know better,
5 # go ahead and edit the file (and please send any changes to
6 # tz@iana.org for general use in the future). For more, please see
7 # the file CONTRIBUTING in the tz distribution.
9 # From Paul Eggert (2014-10-31):
11 # Unless otherwise specified, the source for data through 1990 is:
12 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
13 # San Diego: ACS Publications, Inc. (2003).
14 # Unfortunately this book contains many errors and cites no sources.
16 # Gwillim Law writes that a good source
17 # for recent time zone data is the International Air Transport
18 # Association's Standard Schedules Information Manual (IATA SSIM),
19 # published semiannually. Law sent in several helpful summaries
20 # of the IATA's data after 1990. Except where otherwise noted,
21 # IATA SSIM is the source for entries after 1990.
23 # For data circa 1899, a common source is:
24 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
25 # http://www.jstor.org/stable/1774359
27 # Earlier editions of these tables used the North American style (e.g. ARST and
28 # ARDT for Argentine Standard and Daylight Time), but the following quote
29 # suggests that it's better to use European style (e.g. ART and ARST).
30 # I suggest the use of _Summer time_ instead of the more cumbersome
31 # _daylight-saving time_. _Summer time_ seems to be in general use
32 # in Europe and South America.
33 # -- E O Cutler, _New York Times_ (1937-02-14), quoted in
34 # H L Mencken, _The American Language: Supplement I_ (1960), p 466
36 # Earlier editions of these tables also used the North American style
37 # for time zones in Brazil, but this was incorrect, as Brazilians say
38 # "summer time". Reinaldo Goulart, a São Paulo businessman active in
39 # the railroad sector, writes (1999-07-06):
40 # The subject of time zones is currently a matter of discussion/debate in
41 # Brazil. Let's say that "the Brasília time" is considered the
42 # "official time" because Brasília is the capital city.
43 # The other three time zones are called "Brasília time "minus one" or
44 # "plus one" or "plus two". As far as I know there is no such
45 # name/designation as "Eastern Time" or "Central Time".
46 # So I invented the following (English-language) abbreviations for now.
47 # Corrections are welcome!
49 # -2:00 FNT FNST Fernando de Noronha
50 # -3:00 BRT BRST Brasília
51 # -4:00 AMT AMST Amazon
54 ###############################################################################
56 ###############################################################################
60 # From Bob Devine (1988-01-28):
61 # Argentina: first Sunday in October to first Sunday in April since 1976.
62 # Double Summer time from 1969 to 1974. Switches at midnight.
64 # From U. S. Naval Observatory (1988-01-19):
65 # ARGENTINA 3 H BEHIND UTC
67 # From Hernan G. Otero (1995-06-26):
68 # I am sending modifications to the Argentine time zone table...
69 # AR was chosen because they are the ISO letters that represent Argentina.
71 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
72 Rule Arg 1930 only - Dec 1 0:00 1:00 S
73 Rule Arg 1931 only - Apr 1 0:00 0 -
74 Rule Arg 1931 only - Oct 15 0:00 1:00 S
75 Rule Arg 1932 1940 - Mar 1 0:00 0 -
76 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
77 Rule Arg 1940 only - Jul 1 0:00 1:00 S
78 Rule Arg 1941 only - Jun 15 0:00 0 -
79 Rule Arg 1941 only - Oct 15 0:00 1:00 S
80 Rule Arg 1943 only - Aug 1 0:00 0 -
81 Rule Arg 1943 only - Oct 15 0:00 1:00 S
82 Rule Arg 1946 only - Mar 1 0:00 0 -
83 Rule Arg 1946 only - Oct 1 0:00 1:00 S
84 Rule Arg 1963 only - Oct 1 0:00 0 -
85 Rule Arg 1963 only - Dec 15 0:00 1:00 S
86 Rule Arg 1964 1966 - Mar 1 0:00 0 -
87 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
88 Rule Arg 1967 only - Apr 2 0:00 0 -
89 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
90 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
91 Rule Arg 1974 only - Jan 23 0:00 1:00 S
92 Rule Arg 1974 only - May 1 0:00 0 -
93 Rule Arg 1988 only - Dec 1 0:00 1:00 S
95 # From Hernan G. Otero (1995-06-26):
96 # These corrections were contributed by InterSoft Argentina S.A.,
97 # obtaining the data from the:
98 # Talleres de Hidrografía Naval Argentina
99 # (Argentine Naval Hydrography Institute)
100 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
101 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
103 # From Hernan G. Otero (1995-06-26):
104 # From this moment on, the law that mandated the daylight saving
105 # time corrections was derogated and no more modifications
106 # to the time zones (for daylight saving) are now made.
108 # From Rives McDow (2000-01-10):
109 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
110 # which did not result in the switch of a time zone, as they stayed 9 hours
111 # from the International Date Line.
112 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
113 # From Paul Eggert (2007-12-28):
114 # DST was set to expire on March 5, not March 3, but since it was converted
115 # to standard time on March 3 it's more convenient for us to pretend that
116 # it ended on March 3.
117 Rule Arg 2000 only - Mar 3 0:00 0 -
119 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
120 # We just checked with our São Paulo office and they say the government of
121 # Argentina decided not to become one of the countries that go on or off DST.
122 # So Buenos Aires should be -3 hours from GMT at all times.
124 # From Fabián L. Arce Jofré (2000-04-04):
125 # The law that claimed DST for Argentina was derogated by President Fernando
126 # de la Rúa on March 2, 2000, because it would make people spend more energy
127 # in the winter time, rather than less. The change took effect on March 3.
129 # From Mariano Absatz (2001-06-06):
130 # one of the major newspapers here in Argentina said that the 1999
131 # Timezone Law (which never was effectively applied) will (would?) be
132 # in effect.... The article is at
133 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
134 # ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
135 # 1999-09-17, and published 1999-09-21. The official publication is at:
136 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
137 # Regretfully, you have to subscribe (and pay) for the on-line version....
140 # the timezone for Argentina will not change next Sunday.
141 # Apparently it will do so on Sunday 24th....
142 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
145 # Last Friday (yes, the last working day before the date of the change), the
146 # Senate annulled the 1999 law that introduced the changes later postponed.
147 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
148 # It remains the vote of the Deputies..., but it will be the same....
149 # This kind of things had always been done this way in Argentina.
150 # We are still -03:00 all year round in all of the country.
152 # From Steffen Thorsen (2007-12-21):
153 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
154 # all of the country (all Zone-entries) are affected. News reports like
155 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
156 # that Argentina will use DST next year as well, from October to
157 # March, although exact rules are not given.
159 # From Jesper Nørgaard Welen (2007-12-26)
160 # The last hurdle of Argentina DST is over, the proposal was approved in
161 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
162 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
163 # the original scanned proposal, where the dates and the zero hours are
164 # clear and unambiguous...This is the article about final approval:
165 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
167 # From Paul Eggert (2007-12-22):
168 # For dates after mid-2008, the following rules are my guesses and
169 # are quite possibly wrong, but are more likely than no DST at all.
171 # From Alexander Krivenyshev (2008-09-05):
172 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
173 # Argentina will start DST on Sunday October 19, 2008.
175 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
176 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
178 # From Rodrigo Severo (2008-10-06):
179 # Here is some info available at a Gentoo bug related to TZ on Argentina's DST:
181 # ------- Comment #1 from [jmdocile] 2008-10-06 16:28 0000 -------
182 # Hi, there is a problem with timezone-data-2008e and maybe with
183 # timezone-data-2008f
184 # Argentinian law [Number] 25.155 is no longer valid.
185 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
186 # The new one is law [Number] 26.350
187 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
188 # So there is no summer time in Argentina for now.
190 # From Mariano Absatz (2008-10-20):
191 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
192 # in Argentina from 2008-10-19 until 2009-03-15.
193 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
196 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
197 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
198 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
199 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
201 # Press release 235 dated Saturday October 18th, from the Government of the
202 # Province of Jujuy saying it will not apply DST either (even when it was not
203 # included in Decree 1705/2008).
204 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
206 # From fullinet (2009-10-18):
208 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
209 # (an official .gob.ar) under title: "Sin Cambio de Hora"
210 # (English: "No hour change").
212 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
213 # oficial, decisión que estaba en estudio para su implementación el
214 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
215 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
216 # la modificación del huso horario, ya que 2009 nos encuentra con
217 # crecimiento en la producción y distribución energética."
219 Rule Arg 2007 only - Dec 30 0:00 1:00 S
220 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
221 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
223 # From Mariano Absatz (2004-05-21):
224 # Today it was officially published that the Province of Mendoza is changing
225 # its timezone this winter... starting tomorrow night....
226 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
227 # From Paul Eggert (2004-05-24):
228 # It's Law No. 7,210. This change is due to a public power emergency, so for
229 # now we'll assume it's for this year only.
231 # From Paul Eggert (2014-08-09):
232 # Hora de verano para la República Argentina
233 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
234 # says that standard time in Argentina from 1894-10-31
235 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
236 # over Shanks & Pottenger.
238 # From Mariano Absatz (2004-06-05):
239 # These media articles from a major newspaper mostly cover the current state:
240 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
241 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
243 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
244 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
245 # Apparently, all nine provinces would go back to UTC-03:00 at the same
246 # time in October 17th.
248 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
249 # Tierra del Fuego, Tucumán.
251 # From Mariano Absatz (2004-06-14):
252 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
253 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
254 # annoyance with the change is much higher than the power savings obtained....
256 # From Gwillim Law (2004-06-14):
257 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
258 # "The time change in Tierra del Fuego was a conflicted decision from
259 # the start. The government had decreed that the measure would take
260 # effect on June 1, but a normative error forced the new time to begin
261 # three days earlier, from a Saturday to a Sunday....
262 # Our understanding was that the change was originally scheduled to take place
263 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
264 # provinces). Sunday was May 30, only two days earlier. So the article
265 # contains a contradiction. I would give more credence to the Saturday/Sunday
266 # date than the "three days earlier" phrase, and conclude that Tierra del
267 # Fuego set its clocks back at 2004-05-30 00:00.
269 # From Steffen Thorsen (2004-10-05):
270 # The previous law 7210 which changed the province of Mendoza's time zone
271 # back in May have been modified slightly in a new law 7277, which set the
272 # new end date to 2004-09-26 (original date was 2004-10-17).
273 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
275 # From Mariano Absatz (2004-10-05):
276 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
277 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
278 # at midnight between Saturday, July 24th and Sunday, July 25th....
279 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
280 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
281 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
283 # From Alex Krivenyshev (2008-01-17):
284 # Here are articles that Argentina Province San Luis is planning to end DST
285 # as earlier as upcoming Monday January 21, 2008 or February 2008:
287 # Provincia argentina retrasa reloj y marca diferencia con resto del país
288 # (Argentine Province delayed clock and mark difference with the rest of the
290 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
292 # Es inminente que en San Luis atrasen una hora los relojes
293 # (It is imminent in San Luis clocks one hour delay)
294 # http://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
295 # http://www.worldtimezone.net/dst_news/dst_news_argentina02.html
297 # From Jesper Nørgaard Welen (2008-01-18):
298 # The page of the San Luis provincial government
299 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
300 # confirms what Alex Krivenyshev has earlier sent to the tz
301 # emailing list about that San Luis plans to return to standard
302 # time much earlier than the rest of the country. It also
303 # confirms that upon request the provinces San Juan and Mendoza
304 # refused to follow San Luis in this change.
306 # The change is supposed to take place Monday the 21st at 0:00
307 # hours. As far as I understand it if this goes ahead, we need
308 # a new timezone for San Luis (although there are also documented
309 # independent changes in the southamerica file of San Luis in
310 # 1990 and 1991 which has not been confirmed).
312 # From Jesper Nørgaard Welen (2008-01-25):
313 # Unfortunately the below page has become defunct, about the San Luis
314 # time change. Perhaps because it now is part of a group of pages "Most
315 # important pages of 2008."
318 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
319 # instead it seems. Or use "Buscador" from the main page of the San Luis
320 # government, and fill in "huso" and click OK, and you will get 3 pages
321 # from which the first one is identical to the above.
323 # From Mariano Absatz (2008-01-28):
324 # I can confirm that the Province of San Luis (and so far only that
325 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
326 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
327 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
328 # (that is, unless they change their mind any minute now).
330 # So we'll have to add yet another city to 'southamerica' (I think San
331 # Luis city is the mos populated city in the Province, so it'd be
332 # America/Argentina/San_Luis... of course I can't remember if San Luis's
333 # history of particular changes goes along with Mendoza or San Juan :-(
334 # (I only remember not being able to collect hard facts about San Luis
335 # back in 2004, when these provinces changed to UTC-4 for a few days, I
336 # mailed them personally and never got an answer).
338 # From Paul Eggert (2014-08-12):
339 # Unless otherwise specified, data entries are from Shanks & Pottenger through
340 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that
341 # America/Cordoba split into 6 subregions during 1991/1992, one of which
342 # was America/San_Luis, but we haven't verified this yet so for now we'll
343 # keep America/Cordoba a single region rather than splitting it into the
344 # other 5 subregions.
346 # From Mariano Absatz (2009-03-13):
347 # Yesterday (with our usual 2-day notice) the Province of San Luis
348 # decided that next Sunday instead of "staying" @utc-03:00 they will go
349 # to utc-04:00 until the second Saturday in October...
351 # The press release is at
352 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
353 # (I couldn't find the decree, but www.sanluis.gov.ar
354 # is the official page for the Province Government.)
356 # There's also a note in only one of the major national papers ...
357 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
359 # The press release says [quick and dirty translation]:
360 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
361 # inhabitants) will have to turn back one hour their clocks
363 # Since then, San Luis will establish its own Province timezone. Thus,
364 # during 2009, this timezone change will run from 00:00 the third Sunday
365 # in March until 24:00 of the second Saturday in October.
367 # From Mariano Absatz (2009-10-16):
368 # ...the Province of San Luis is a case in itself.
371 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
372 # is ambiguous because establishes a calendar from the 2nd Sunday in
373 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
374 # complement of that starting on the 2nd Sunday of March at 0:00 and
375 # ending on the 2nd Saturday of March at 24:00.
377 # This clearly breaks every time the 1st of March or October is a Sunday.
379 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
380 # Sunday of October and March.
382 # The problem is that the changes in the rest of the Provinces that did
383 # change in 2007/2008, were made according to the Federal Law and Decrees
384 # that did so on the 3rd Sunday of October and March.
386 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
387 # (October 11th) at 0:00.
389 # So I guess a new set of rules, besides "Arg", must be made and the last
390 # America/Argentina/San_Luis entries should change to use these...
392 # I'm enclosing a patch that does what I say... regretfully, the San Luis
393 # timezone must be called "WART/WARST" even when most of the time (like,
394 # right now) WARST == ART... that is, since last Sunday, all the country
395 # is using UTC-3, but in my patch, San Luis calls it "WARST" and the rest
396 # of the country calls it "ART".
399 # From Alexander Krivenyshev (2010-04-09):
400 # According to news reports from El Diario de la República Province San
401 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
402 # after April 11, 2010 - will continue to have same time as rest of
403 # Argentina (UTC-3) (no DST).
405 # Confirmaron la prórroga del huso horario de verano (Spanish)
406 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
407 # or (some English translation):
408 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
410 # From Mariano Absatz (2010-04-12):
411 # yes...I can confirm this...and given that San Luis keeps calling
412 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
413 # rules...San Luis is still using "Western ARgentina Time" and it got
414 # stuck on Summer daylight savings time even though the summer is over.
416 # From Paul Eggert (2013-09-05):
417 # Perhaps San Luis operates on the legal fiction that it is at UTC-4
418 # with perpetual summer time, but ordinary usage typically seems to
419 # just say it's at UTC-3; see, for example,
420 # http://es.wikipedia.org/wiki/Hora_oficial_argentina
421 # We've documented similar situations as being plain changes to
422 # standard time, so let's do that here too. This does not change UTC
423 # offsets, only tm_isdst and the time zone abbreviations. One minor
424 # plus is that this silences a zic complaint that there's no POSIX TZ
425 # setting for time stamps past 2038.
427 # From Paul Eggert (2013-02-21):
428 # Milne says Córdoba time was -4:16:48.2. Round to the nearest second.
430 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
432 # Buenos Aires (BA), Capital Federal (CF),
433 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
434 -4:16:48 - CMT 1920 May # Córdoba Mean Time
436 -4:00 Arg AR%sT 1969 Oct 5
437 -3:00 Arg AR%sT 1999 Oct 3
438 -4:00 Arg AR%sT 2000 Mar 3
441 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
442 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
444 # Shanks & Pottenger also make the following claims, which we haven't verified:
445 # - Formosa switched to -3:00 on 1991-01-07.
446 # - Misiones switched to -3:00 on 1990-12-29.
447 # - Chaco switched to -3:00 on 1991-01-04.
448 # - Santiago del Estero switched to -4:00 on 1991-04-01,
449 # then to -3:00 on 1991-04-26.
451 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
452 -4:16:48 - CMT 1920 May
454 -4:00 Arg AR%sT 1969 Oct 5
455 -3:00 Arg AR%sT 1991 Mar 3
456 -4:00 - WART 1991 Oct 20
457 -3:00 Arg AR%sT 1999 Oct 3
458 -4:00 Arg AR%sT 2000 Mar 3
461 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
462 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
463 -4:16:48 - CMT 1920 May
465 -4:00 Arg AR%sT 1969 Oct 5
466 -3:00 Arg AR%sT 1991 Mar 3
467 -4:00 - WART 1991 Oct 20
468 -3:00 Arg AR%sT 1999 Oct 3
469 -4:00 Arg AR%sT 2000 Mar 3
470 -3:00 Arg AR%sT 2008 Oct 18
474 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
475 -4:16:48 - CMT 1920 May
477 -4:00 Arg AR%sT 1969 Oct 5
478 -3:00 Arg AR%sT 1991 Mar 3
479 -4:00 - WART 1991 Oct 20
480 -3:00 Arg AR%sT 1999 Oct 3
481 -4:00 Arg AR%sT 2000 Mar 3
482 -3:00 - ART 2004 Jun 1
483 -4:00 - WART 2004 Jun 13
487 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
488 -4:16:48 - CMT 1920 May
490 -4:00 Arg AR%sT 1969 Oct 5
491 -3:00 Arg AR%sT 1991 Mar 1
492 -4:00 - WART 1991 May 7
493 -3:00 Arg AR%sT 1999 Oct 3
494 -4:00 Arg AR%sT 2000 Mar 3
495 -3:00 - ART 2004 Jun 1
496 -4:00 - WART 2004 Jun 20
497 -3:00 Arg AR%sT 2008 Oct 18
501 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
502 -4:16:48 - CMT 1920 May
504 -4:00 Arg AR%sT 1969 Oct 5
505 -3:00 Arg AR%sT 1991 Mar 1
506 -4:00 - WART 1991 May 7
507 -3:00 Arg AR%sT 1999 Oct 3
508 -4:00 Arg AR%sT 2000 Mar 3
509 -3:00 - ART 2004 May 31
510 -4:00 - WART 2004 Jul 25
511 -3:00 Arg AR%sT 2008 Oct 18
515 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
516 -4:16:48 - CMT 1920 May
518 -4:00 Arg AR%sT 1969 Oct 5
519 -3:00 Arg AR%sT 1990 Mar 4
520 -4:00 - WART 1990 Oct 28
521 -4:00 1:00 WARST 1991 Mar 17
522 -4:00 - WART 1991 Oct 6
524 -3:00 Arg AR%sT 1999 Oct 3
525 -4:00 Arg AR%sT 2000 Mar 3
526 -3:00 Arg AR%sT 2008 Oct 18
529 # Catamarca (CT), Chubut (CH)
530 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
531 -4:16:48 - CMT 1920 May
533 -4:00 Arg AR%sT 1969 Oct 5
534 -3:00 Arg AR%sT 1991 Mar 3
535 -4:00 - WART 1991 Oct 20
536 -3:00 Arg AR%sT 1999 Oct 3
537 -4:00 Arg AR%sT 2000 Mar 3
538 -3:00 - ART 2004 Jun 1
539 -4:00 - WART 2004 Jun 20
540 -3:00 Arg AR%sT 2008 Oct 18
544 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
545 -4:16:48 - CMT 1920 May
547 -4:00 Arg AR%sT 1969 Oct 5
548 -3:00 Arg AR%sT 1990 Mar 4
549 -4:00 - WART 1990 Oct 15
550 -4:00 1:00 WARST 1991 Mar 1
551 -4:00 - WART 1991 Oct 15
552 -4:00 1:00 WARST 1992 Mar 1
553 -4:00 - WART 1992 Oct 18
554 -3:00 Arg AR%sT 1999 Oct 3
555 -4:00 Arg AR%sT 2000 Mar 3
556 -3:00 - ART 2004 May 23
557 -4:00 - WART 2004 Sep 26
558 -3:00 Arg AR%sT 2008 Oct 18
563 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
564 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 S
566 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
567 -4:16:48 - CMT 1920 May
569 -4:00 Arg AR%sT 1969 Oct 5
571 -3:00 1:00 ARST 1990 Mar 14
572 -4:00 - WART 1990 Oct 15
573 -4:00 1:00 WARST 1991 Mar 1
574 -4:00 - WART 1991 Jun 1
575 -3:00 - ART 1999 Oct 3
576 -4:00 1:00 WARST 2000 Mar 3
577 -3:00 - ART 2004 May 31
578 -4:00 - WART 2004 Jul 25
579 -3:00 Arg AR%sT 2008 Jan 21
580 -4:00 SanLuis WAR%sT 2009 Oct 11
584 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
585 -4:16:48 - CMT 1920 May # Córdoba Mean Time
587 -4:00 Arg AR%sT 1969 Oct 5
588 -3:00 Arg AR%sT 1999 Oct 3
589 -4:00 Arg AR%sT 2000 Mar 3
590 -3:00 - ART 2004 Jun 1
591 -4:00 - WART 2004 Jun 20
592 -3:00 Arg AR%sT 2008 Oct 18
595 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
596 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
597 -4:16:48 - CMT 1920 May # Córdoba Mean Time
599 -4:00 Arg AR%sT 1969 Oct 5
600 -3:00 Arg AR%sT 1999 Oct 3
601 -4:00 Arg AR%sT 2000 Mar 3
602 -3:00 - ART 2004 May 30
603 -4:00 - WART 2004 Jun 20
604 -3:00 Arg AR%sT 2008 Oct 18
608 Link America/Curacao America/Aruba
611 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
612 Zone America/La_Paz -4:32:36 - LMT 1890
613 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
614 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
615 -4:00 - BOT # Bolivia Time
619 # From Paul Eggert (1993-11-18):
620 # The mayor of Rio recently attempted to change the time zone rules
621 # just in his city, in order to leave more summer time for the tourist trade.
622 # The rule change lasted only part of the day;
623 # the federal government refused to follow the city's rules, and business
624 # was in a chaos, so the mayor backed down that afternoon.
626 # From IATA SSIM (1996-02):
627 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
628 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
629 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
630 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
631 # [The last three states are new to this issue of the IATA SSIM.]
633 # From Gwillim Law (1996-10-07):
634 # Geography, history (Tocantins was part of Goiás until 1989), and other
635 # sources of time zone information lead me to believe that AL, SE, and TO were
636 # always in BR1, and so the only change was whether or not they observed DST....
637 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
638 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
639 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
640 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
641 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
642 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
643 # become part of the state of Pernambuco). The boundary between BR1 and BR2
644 # has never been clearly stated. They've simply been called East and West.
645 # However, some conclusions can be drawn from another IATA manual: the Airline
646 # Coding Directory, which lists close to 400 airports in Brazil. For each
647 # airport it gives a time zone which is coded to the SSIM. From that
648 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
649 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
650 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
652 # From Marcos Tadeu (1998-09-27):
653 # Brazilian official page <http://pcdsh01.on.br/verao1.html>
655 # From Jesper Nørgaard (2000-11-03):
656 # [For an official list of which regions in Brazil use which time zones, see:]
657 # http://pcdsh01.on.br/Fusbr.htm
658 # http://pcdsh01.on.br/Fusbrhv.htm
660 # From Celso Doria via David Madeo (2002-10-09):
661 # The reason for the delay this year has to do with elections in Brazil.
663 # Unlike in the United States, elections in Brazil are 100% computerized and
664 # the results are known almost immediately. Yesterday, it was the first
665 # round of the elections when 115 million Brazilians voted for President,
666 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
667 # counting (or re-counting) votes anymore and we know there will be a second
668 # round for the Presidency and also for some Governors. The 2nd round will
669 # take place on October 27th.
671 # The reason why the DST will only begin November 3rd is that the thousands
672 # of electoral machines used cannot have their time changed, and since the
673 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
674 # the Government decided to postpone DST, instead of changing the Constitution
675 # (maybe, for the next elections, it will be possible to change the clock)...
677 # From Rodrigo Severo (2004-10-04):
678 # It's just the biannual change made necessary by the much hyped, supposedly
679 # modern Brazilian eletronic voting machines which, apparently, can't deal
680 # with a time change between the first and the second rounds of the elections.
682 # From Steffen Thorsen (2007-09-20):
683 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
684 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
686 # From Paul Schulze (2008-06-24):
687 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
688 # Oficial da União"...) in Brazil there are changes in the timezones,
689 # effective today (00:00am at June 24, 2008) as follows:
691 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
692 # part of the Amazonas state that had this timezone now being put to the
694 # b) The whole Pará state now is put at timezone UTC+3, instead of just
695 # part of it, as was before.
697 # This change follows a proposal of senator Tiao Viana of Acre state, that
698 # proposed it due to concerns about open television channels displaying
699 # programs inappropriate to youths in the states that had the timezone
700 # UTC+5 too early in the night. In the occasion, some more corrections
701 # were proposed, trying to unify the timezones of any given state. This
702 # change modifies timezone rules defined in decree 2.784 of 18 June,
705 # From Rodrigo Severo (2008-06-24):
706 # Just correcting the URL:
707 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
709 # As a result of the above Decree I believe the America/Rio_Branco
710 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
711 # be created to represent the...west side of the Pará State. I
712 # suggest this new timezone be called Santarem as the most
713 # important/populated city in the affected area.
715 # This new timezone would be the same as the Rio_Branco timezone up to
716 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
718 # From Alex Krivenyshev (2008-06-24):
719 # This is a quick reference page for New and Old Brazil Time Zones map.
720 # http://www.worldtimezone.com/brazil-time-new-old.php
722 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
723 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
724 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
726 # From Paul Eggert (2002-10-10):
727 # The official decrees referenced below are mostly taken from
728 # Decretos sobre o Horário de Verão no Brasil.
729 # http://pcdsh01.on.br/DecHV.html
731 # From Steffen Thorsen (2008-08-29):
732 # As announced by the government and many newspapers in Brazil late
733 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
734 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
735 # past years experience with the elections, there was a good chance that
736 # the start was postponed to November, but it did not happen this year.
738 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
740 # An official page about it:
741 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
742 # Note that this link does not always work directly, but must be accessed
744 # http://www.mme.gov.br/first
746 # One example link that works directly:
747 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
750 # We have a written a short article about it as well:
751 # http://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
753 # From Alexander Krivenyshev (2011-10-04):
754 # State Bahia will return to Daylight savings time this year after 8 years off.
755 # The announcement was made by Governor Jaques Wagner in an interview to a
756 # television station in Salvador.
759 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
760 # http://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
762 # From Guilherme Bernardes Rodrigues (2011-10-07):
763 # There is news in the media, however there is still no decree about it.
764 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
765 # official agency about time in Brazil, and she confirmed that the old rule is
768 # From Guilherme Bernardes Rodrigues (2011-10-14)
769 # It's official, the President signed a decree that includes Bahia in summer
771 # [ and in a second message (same day): ]
772 # I found the decree.
774 # DECRETO No- 7.584, DE 13 DE OUTUBRO DE 2011
776 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
778 # From Kelley Cook (2012-10-16):
779 # The governor of state of Bahia in Brazil announced on Thursday that
780 # due to public pressure, he is reversing the DST policy they implemented
781 # last year and will not be going to Summer Time on October 21st....
782 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
784 # From Rodrigo Severo (2012-10-16):
785 # Tocantins state will have DST.
786 # http://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
788 # From Steffen Thorsen (2013-09-20):
789 # Tocantins in Brazil is very likely not to observe DST from October....
790 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
791 # We will keep this article updated when this is confirmed:
792 # http://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
794 # From Steffen Thorsen (2013-10-17):
795 # http://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
796 # Senator Jorge Viana announced that Acre will change time zone on November 10.
797 # He did not specify the time of the change, nor if western parts of Amazonas
798 # will change as well.
800 # From Paul Eggert (2013-10-17):
801 # For now, assume western Amazonas will change as well.
803 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
804 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
805 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
806 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
807 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
808 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
809 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
811 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
812 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
813 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
814 Rule Brazil 1950 only - Apr 16 1:00 0 -
815 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
816 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
817 Rule Brazil 1953 only - Mar 1 0:00 0 -
818 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
820 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
821 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
822 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
823 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
824 # extended the above decree to all of the national territory on 12-09.
825 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
826 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
827 # extended summer time by one day to 1964-03-01 00:00 (start of school).
828 Rule Brazil 1964 only - Mar 1 0:00 0 -
829 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
830 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
831 Rule Brazil 1965 only - Mar 31 0:00 0 -
832 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
833 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
834 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
835 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
836 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
837 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
839 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
840 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
841 # Decree 92,310 (1986-01-21)
842 # Decree 92,463 (1986-03-13)
843 Rule Brazil 1986 only - Mar 15 0:00 0 -
844 # Decree 93,316 (1986-10-01)
845 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
846 Rule Brazil 1987 only - Feb 14 0:00 0 -
847 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
848 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
849 Rule Brazil 1988 only - Feb 7 0:00 0 -
850 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
851 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
852 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
853 Rule Brazil 1989 only - Jan 29 0:00 0 -
854 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
855 # with the same exceptions
856 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
857 Rule Brazil 1990 only - Feb 11 0:00 0 -
858 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
859 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
860 # Decree 99,629 (1990-10-19) adds BA, MT.
861 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
862 Rule Brazil 1991 only - Feb 17 0:00 0 -
863 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
864 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
865 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
866 Rule Brazil 1992 only - Feb 9 0:00 0 -
867 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
868 # adopted by same states.
869 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
870 Rule Brazil 1993 only - Jan 31 0:00 0 -
871 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
872 # adopted by same states, plus AM.
873 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
874 # web page corrected 2004-01-07) adopted by same states, minus AM.
875 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
876 # adopted by same states, plus MT and TO.
877 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
879 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
880 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
881 Rule Brazil 1996 only - Feb 11 0:00 0 -
882 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
883 # adopted by same states, minus AL, SE.
884 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
885 Rule Brazil 1997 only - Feb 16 0:00 0 -
886 # From Daniel C. Sobral (1998-02-12):
887 # In 1997, the DS began on October 6. The stated reason was that
888 # because international television networks ignored Brazil's policy on DS,
889 # they bought the wrong times on satellite for coverage of Pope's visit.
890 # This year, the ending date of DS was postponed to March 1
891 # to help dealing with the shortages of electric power.
893 # Decree 2,317 (1997-09-04), adopted by same states.
894 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
895 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
897 Rule Brazil 1998 only - Mar 1 0:00 0 -
898 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
899 # adopted by the same states as before.
900 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
901 Rule Brazil 1999 only - Feb 21 0:00 0 -
902 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
903 # (1999-08-23) adopted by same states.
904 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
905 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
906 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
907 Rule Brazil 2000 only - Feb 27 0:00 0 -
908 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
909 # adopted by the same states as before.
910 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
911 # repeals DST in PE and RR, effective 2000-10-15 00:00.
912 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
913 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
914 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
915 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
916 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
917 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
918 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
919 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
920 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
921 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
922 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
923 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
924 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
925 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
926 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
927 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
928 # adopted by the same states as before.
929 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
930 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
931 # adopted by the same states as before.
932 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
933 Rule Brazil 2007 only - Feb 25 0:00 0 -
934 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
935 # adopted by the same states as before.
936 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
937 # From Frederico A. C. Neves (2008-09-10):
938 # According to this decree
939 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
940 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
941 # 3rd Feb Sunday. There is an exception on the return date when this is
942 # the Carnival Sunday then the return date will be the next Sunday...
943 Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S
944 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
945 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
946 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
947 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
948 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
949 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
950 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
951 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
952 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
953 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
954 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
955 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
956 # From Arthur David Olson (2008-09-29):
957 # The next is wrong in some years but is better than nothing.
958 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
960 # The latest ruleset listed above says that the following states observe DST:
961 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
963 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
965 # Fernando de Noronha (administratively part of PE)
966 Zone America/Noronha -2:09:40 - LMT 1914
967 -2:00 Brazil FN%sT 1990 Sep 17
968 -2:00 - FNT 1999 Sep 30
969 -2:00 Brazil FN%sT 2000 Oct 15
970 -2:00 - FNT 2001 Sep 13
971 -2:00 Brazil FN%sT 2002 Oct 1
973 # Other Atlantic islands have no permanent settlement.
974 # These include Trindade and Martim Vaz (administratively part of ES),
975 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
976 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
977 # it also included the Penedos.
979 # Amapá (AP), east Pará (PA)
980 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
981 # The division between east and west Pará is the river Xingu.
982 # In the north a very small part from the river Javary (now Jari I guess,
983 # the border with Amapá) to the Amazon, then to the Xingu.
984 Zone America/Belem -3:13:56 - LMT 1914
985 -3:00 Brazil BR%sT 1988 Sep 12
989 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
990 Zone America/Santarem -3:38:48 - LMT 1914
991 -4:00 Brazil AM%sT 1988 Sep 12
992 -4:00 - AMT 2008 Jun 24 0:00
995 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
997 Zone America/Fortaleza -2:34:00 - LMT 1914
998 -3:00 Brazil BR%sT 1990 Sep 17
999 -3:00 - BRT 1999 Sep 30
1000 -3:00 Brazil BR%sT 2000 Oct 22
1001 -3:00 - BRT 2001 Sep 13
1002 -3:00 Brazil BR%sT 2002 Oct 1
1005 # Pernambuco (PE) (except Atlantic islands)
1006 Zone America/Recife -2:19:36 - LMT 1914
1007 -3:00 Brazil BR%sT 1990 Sep 17
1008 -3:00 - BRT 1999 Sep 30
1009 -3:00 Brazil BR%sT 2000 Oct 15
1010 -3:00 - BRT 2001 Sep 13
1011 -3:00 Brazil BR%sT 2002 Oct 1
1015 Zone America/Araguaina -3:12:48 - LMT 1914
1016 -3:00 Brazil BR%sT 1990 Sep 17
1017 -3:00 - BRT 1995 Sep 14
1018 -3:00 Brazil BR%sT 2003 Sep 24
1019 -3:00 - BRT 2012 Oct 21
1020 -3:00 Brazil BR%sT 2013 Sep
1023 # Alagoas (AL), Sergipe (SE)
1024 Zone America/Maceio -2:22:52 - LMT 1914
1025 -3:00 Brazil BR%sT 1990 Sep 17
1026 -3:00 - BRT 1995 Oct 13
1027 -3:00 Brazil BR%sT 1996 Sep 4
1028 -3:00 - BRT 1999 Sep 30
1029 -3:00 Brazil BR%sT 2000 Oct 22
1030 -3:00 - BRT 2001 Sep 13
1031 -3:00 Brazil BR%sT 2002 Oct 1
1035 # There are too many Salvadors elsewhere, so use America/Bahia instead
1036 # of America/Salvador.
1037 Zone America/Bahia -2:34:04 - LMT 1914
1038 -3:00 Brazil BR%sT 2003 Sep 24
1039 -3:00 - BRT 2011 Oct 16
1040 -3:00 Brazil BR%sT 2012 Oct 21
1043 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
1044 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
1045 # Santa Catarina (SC), Rio Grande do Sul (RS)
1046 Zone America/Sao_Paulo -3:06:28 - LMT 1914
1047 -3:00 Brazil BR%sT 1963 Oct 23 0:00
1048 -3:00 1:00 BRST 1964
1051 # Mato Grosso do Sul (MS)
1052 Zone America/Campo_Grande -3:38:28 - LMT 1914
1056 Zone America/Cuiaba -3:44:20 - LMT 1914
1057 -4:00 Brazil AM%sT 2003 Sep 24
1058 -4:00 - AMT 2004 Oct 1
1062 Zone America/Porto_Velho -4:15:36 - LMT 1914
1063 -4:00 Brazil AM%sT 1988 Sep 12
1067 Zone America/Boa_Vista -4:02:40 - LMT 1914
1068 -4:00 Brazil AM%sT 1988 Sep 12
1069 -4:00 - AMT 1999 Sep 30
1070 -4:00 Brazil AM%sT 2000 Oct 15
1073 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
1074 # The great circle line from Tabatinga to Porto Acre divides
1075 # east from west Amazonas.
1076 Zone America/Manaus -4:00:04 - LMT 1914
1077 -4:00 Brazil AM%sT 1988 Sep 12
1078 -4:00 - AMT 1993 Sep 28
1079 -4:00 Brazil AM%sT 1994 Sep 22
1082 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1083 # Eirunepé, Envira, Ipixuna
1084 Zone America/Eirunepe -4:39:28 - LMT 1914
1085 -5:00 Brazil AC%sT 1988 Sep 12
1086 -5:00 - ACT 1993 Sep 28
1087 -5:00 Brazil AC%sT 1994 Sep 22
1088 -5:00 - ACT 2008 Jun 24 0:00
1089 -4:00 - AMT 2013 Nov 10
1093 Zone America/Rio_Branco -4:31:12 - LMT 1914
1094 -5:00 Brazil AC%sT 1988 Sep 12
1095 -5:00 - ACT 2008 Jun 24 0:00
1096 -4:00 - AMT 2013 Nov 10
1101 # From Paul Eggert (2015-04-03):
1102 # Shanks & Pottenger says America/Santiago introduced standard time in
1103 # 1890 and rounds its UTC offset to 70W40; guess that in practice this
1104 # was the same offset as in 1916-1919. It also says Pacific/Easter
1105 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1107 # Dates for America/Santiago from 1910 to 2004 are primarily from
1108 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1110 # http://www.webexhibits.org/daylightsaving/chile.html
1111 # This contains a copy of a this official table:
1112 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1113 # http://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1114 # [1] needs several corrections, though.
1116 # The first set of corrections is from:
1117 # [2] History of the Official Time of Chile
1118 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1119 # http://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1120 # This is an English translation of:
1121 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1122 # http://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1123 # A fancier Spanish version (requiring mouse-clicking) is at:
1124 # http://www.horaoficial.cl/historia_hora.html
1125 # Conflicts between [1] and [2] were resolved as follows:
1127 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
1128 # Boletín Nº 1, Aviso Nº 1 (1910). Go with [2].
1130 # - [1] says SMT was -4:42:45, [2] says Chile's official time from
1131 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
1132 # Astronomical Observatory (OAN), then located in what is now
1133 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
1135 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
1136 # Boletín Nº 22, Aviso Nº 129/1918 (1918-08-23). Go with [2].
1138 # - [1] does not give times for transitions; assume they occur
1139 # at midnight mainland time, the current common practice. However,
1140 # go with [2]'s specification of 23:00 for the 1947-05-21 transition.
1142 # Another correction to [1] is from Jesper Nørgaard Welen, who
1143 # wrote (2006-10-08), "I think that there are some obvious mistakes in
1144 # the suggested link from Oscar van Vlijmen,... for instance entry 66
1145 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
1146 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
1147 # respectively), but anyhow it clears up some doubts too."
1149 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
1150 # Pottenger. After that, for lack of better info assume
1151 # Pacific/Easter is always two hours behind America/Santiago;
1152 # this is known to work for DST transitions starting in 2008 and
1153 # may well be true for earlier transitions.
1155 # From Eduardo Krell (1995-10-19):
1156 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
1157 # of October.... The law is the same for March and October.
1159 # Because of the drought this year, the government decided to go into
1160 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1161 # (unless there's another dry season next year, I guess).
1163 # From Julio I. Pacheco Troncoso (1999-03-18):
1164 # Because of the same drought, the government decided to end DST later,
1165 # on April 3, (one-time change).
1167 # From Germán Poo-Caamaño (2008-03-03):
1168 # Due to drought, Chile extends Daylight Time in three weeks. This
1169 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1170 # and Saturday 3/29 at 22:00 for Pacific/Easter)
1171 # The Supreme Decree is located at
1172 # http://www.shoa.cl/servicios/supremo316.pdf
1174 # From José Miguel Garrido (2008-03-05):
1175 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
1177 # From Angel Chiang (2010-03-04):
1178 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
1179 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
1181 # From Arthur David Olson (2010-03-06):
1182 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
1184 # From Glenn Eychaner (2011-03-28):
1185 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
1187 # Chile's clocks will go back an hour this year on the 7th of May instead
1188 # of this Saturday. They will go forward again the 3rd Saturday in
1189 # August, not in October as they have since 1968.
1191 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
1192 # As stated in the website of the Chilean Energy Ministry
1193 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
1194 # The Chilean Government has decided to postpone the entrance into winter time
1195 # (to leave DST) from March 11 2012 to April 28th 2012....
1196 # Quote from the website communication:
1198 # 6. For the year 2012, the dates of entry into winter time will be as follows:
1199 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
1200 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
1202 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
1203 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
1204 # 01:00 on September 2.
1206 # From Steffen Thorsen (2013-02-15):
1207 # According to several news sources, Chile has extended DST this year,
1208 # they will end DST later and start DST earlier than planned. They
1209 # hope to save energy. The new end date is 2013-04-28 00:00 and new
1210 # start date is 2013-09-08 00:00....
1211 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
1213 # From José Miguel Garrido (2014-02-19):
1214 # Today appeared in the Diario Oficial a decree amending the time change
1216 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
1217 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
1218 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
1220 # From Eduardo Romero Urra (2015-03-03):
1221 # Today has been published officially that Chile will use the DST time
1222 # permanently until March 25 of 2017
1223 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
1225 # From Paul Eggert (2015-03-03):
1226 # For now, assume that the extension will persist indefinitely.
1228 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1229 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
1230 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1231 Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1232 Rule Chile 1969 only - Mar 30 3:00u 0 -
1233 Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1234 Rule Chile 1970 only - Mar 29 3:00u 0 -
1235 Rule Chile 1971 only - Mar 14 3:00u 0 -
1236 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1237 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1238 Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1239 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1240 Rule Chile 1987 only - Apr 12 3:00u 0 -
1241 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1242 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
1243 Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1244 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1245 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1246 Rule Chile 1997 only - Mar 30 3:00u 0 -
1247 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1248 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1249 Rule Chile 1999 only - Apr 4 3:00u 0 -
1250 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 S
1251 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1252 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1253 # which is used below in specifying the transition.
1254 Rule Chile 2008 only - Mar 30 3:00u 0 -
1255 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1256 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1257 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1258 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 S
1259 Rule Chile 2012 2015 - Apr Sun>=23 3:00u 0 -
1260 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
1261 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1262 # (1996-09) says 1998-03-08. Ignore these.
1263 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1264 Zone America/Santiago -4:42:46 - LMT 1890
1265 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1266 -5:00 - CLT 1916 Jul 1 # Chile Time
1267 -4:42:46 - SMT 1918 Sep 10
1268 -4:00 - CLT 1919 Jul 1
1269 -4:42:46 - SMT 1927 Sep 1
1270 -5:00 Chile CL%sT 1932 Sep 1
1271 -4:00 - CLT 1942 Jun 1
1272 -5:00 - CLT 1942 Aug 1
1273 -4:00 - CLT 1946 Jul 15
1274 -4:00 1:00 CLST 1946 Sep 1 # central Chile
1275 -4:00 - CLT 1947 Apr 1
1276 -5:00 - CLT 1947 May 21 23:00
1277 -4:00 Chile CL%sT 2015 Apr 26 3:00u
1279 Zone Pacific/Easter -7:17:28 - LMT 1890
1280 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1281 -7:00 Chile EAS%sT 1982 Mar 14 3:00u # Easter Time
1282 -6:00 Chile EAS%sT 2015 Apr 26 3:00u
1285 # Salas y Gómez Island is uninhabited.
1286 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
1287 # and Antarctic bases, are like America/Santiago.
1289 # Antarctic base using South American rules
1290 # (See the file 'antarctica' for more.)
1292 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
1294 # From Ethan Dicks (1996-10-06):
1295 # It keeps the same time as Punta Arenas, Chile, because, just like us
1296 # and the South Pole, that's the other end of their supply line....
1297 # I verified with someone who was there that since 1980,
1298 # Palmer has followed Chile. Prior to that, before the Falklands War,
1299 # Palmer used to be supplied from Argentina.
1301 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1302 Zone Antarctica/Palmer 0 - zzz 1965
1303 -4:00 Arg AR%sT 1969 Oct 5
1304 -3:00 Arg AR%sT 1982 May
1305 -4:00 Chile CL%sT 2015 Apr 26 3:00u
1310 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1311 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1313 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1314 Rule CO 1992 only - May 3 0:00 1:00 S
1315 Rule CO 1993 only - Apr 4 0:00 0 -
1316 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1317 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1318 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1319 -5:00 CO CO%sT # Colombia Time
1320 # Malpelo, Providencia, San Andres
1321 # no information; probably like America/Bogota
1325 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1327 # From Paul Eggert (2006-03-22):
1328 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1329 # -4:00 since standard time was introduced on 1912-03-02; and that
1330 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1331 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1332 # Saba Island has been like Curaçao.
1333 # This all predates our 1970 cutoff, though.
1335 # By July 2007 Curaçao and St Maarten are planned to become
1336 # associated states within the Netherlands, much like Aruba;
1337 # Bonaire, Saba and St Eustatius would become directly part of the
1338 # Netherlands as Kingdom Islands. This won't affect their time zones
1339 # though, as far as we know.
1341 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1342 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad
1343 -4:30 - ANT 1965 # Netherlands Antilles Time
1346 # From Arthur David Olson (2011-06-15):
1347 # use links for places with new iso3166 codes.
1348 # The name "Lower Prince's Quarter" is both longer than fourteen characters
1349 # and contains an apostrophe; use "Lower_Princes" below.
1351 Link America/Curacao America/Lower_Princes # Sint Maarten
1352 Link America/Curacao America/Kralendijk # Caribbean Netherlands
1356 # Milne says the Central and South American Telegraph Company used -5:24:15.
1358 # From Paul Eggert (2007-03-04):
1359 # Apparently Ecuador had a failed experiment with DST in 1992.
1360 # <http://midena.gov.ec/content/view/1261/208/> (2007-02-27) and
1361 # <http://www.hoy.com.ec/NoticiaNue.asp?row_id=249856> (2006-11-06) both
1362 # talk about "hora Sixto". Leave this alone for now, as we have no data.
1364 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1365 Zone America/Guayaquil -5:19:20 - LMT 1890
1366 -5:14:00 - QMT 1931 # Quito Mean Time
1367 -5:00 - ECT # Ecuador Time
1368 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1370 -6:00 - GALT # Galápagos Time
1374 # From Paul Eggert (2006-03-22):
1375 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1376 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1378 # From Falkland Islands Government Office, London (2001-01-22)
1379 # via Jesper Nørgaard:
1380 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1381 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1382 # September. It is anticipated that the clocks will revert back at 2
1383 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
1384 # Sunday 1 September.
1386 # From Rives McDow (2001-02-13):
1388 # I have communicated several times with people there, and the last
1389 # time I had communications that was helpful was in 1998. Here is
1390 # what was said then:
1392 # "The general rule was that Stanley used daylight saving and the Camp
1393 # did not. However for various reasons many people in the Camp have
1394 # started to use daylight saving (known locally as 'Stanley Time')
1395 # There is no rule as to who uses daylight saving - it is a matter of
1396 # personal choice and so it is impossible to draw a map showing who
1397 # uses it and who does not. Any list would be out of date as soon as
1398 # it was produced. This year daylight saving ended on April 18/19th
1399 # and started again on September 12/13th. I do not know what the rule
1400 # is, but can find out if you like. We do not change at the same time
1403 # I did have in my notes that the rule was "Second Saturday in Sep at
1404 # 0:00 until third Saturday in Apr at 0:00". I think that this does
1405 # not agree in some cases with Shanks; is this true?
1407 # Also, there is no mention in the list that some areas in the
1408 # Falklands do not use DST. I have found in my communications there
1409 # that these areas are on the western half of East Falkland and all of
1410 # West Falkland. Stanley is the only place that consistently observes
1411 # DST. Again, as in other places in the world, the farmers don't like
1412 # it. West Falkland is almost entirely sheep farmers.
1414 # I know one lady there that keeps a list of which farm keeps DST and
1415 # which doesn't each year. She runs a shop in Stanley, and says that
1416 # the list changes each year. She uses it to communicate to her
1417 # customers, catching them when they are home for lunch or dinner.
1419 # From Paul Eggert (2001-03-05):
1420 # For now, we'll just record the time in Stanley, since we have no
1423 # From Steffen Thorsen (2011-04-01):
1424 # The Falkland Islands will not turn back clocks this winter, but stay on
1425 # daylight saving time.
1428 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
1430 # We have gotten this confirmed by a clerk of the legislative assembly:
1431 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1432 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1433 # hours) on the first Sunday of September at 0200hrs.
1435 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1436 # will not revert to local mean time, but clocks will remain on Summer
1437 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1438 # change to local time following the trial period will be notified.
1440 # From Andrew Newman (2012-02-24)
1441 # A letter from Justin McPhee, Chief Executive,
1442 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1444 # The current Atlantic/Stanley entry under South America expects the
1445 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1446 # The database entry states that in 2011 Stanley was staying on fixed
1447 # summer time on a trial basis only. FIG need to contact IANA and/or
1448 # the maintainers of the database to inform them we're adopting
1449 # the same policy this year and suggest recommendations for future years.
1451 # For now we will assume permanent summer time for the Falklands
1452 # until advised differently (to apply for 2012 and beyond, after the 2011
1453 # experiment was apparently successful.)
1454 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1455 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1456 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1457 Rule Falk 1939 only - Oct 1 0:00 1:00 S
1458 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1459 Rule Falk 1943 only - Jan 1 0:00 0 -
1460 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1461 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1462 Rule Falk 1984 only - Sep 16 0:00 1:00 S
1463 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1464 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1465 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1466 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 S
1467 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1468 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1469 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1470 -4:00 Falk FK%sT 1983 May # Falkland Is Time
1471 -3:00 Falk FK%sT 1985 Sep 15
1472 -4:00 Falk FK%sT 2010 Sep 5 2:00
1476 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1477 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1478 -4:00 - GFT 1967 Oct # French Guiana Time
1482 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1483 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1484 -3:45 - GBGT 1966 May 26 # Br Guiana Time
1485 -3:45 - GYT 1975 Jul 31 # Guyana Time
1487 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1492 # From Paul Eggert (2006-03-22):
1493 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1494 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1495 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1497 # From Waldemar Villamayor-Venialbo (2013-09-20):
1498 # No time of the day is established for the adjustment, so people normally
1499 # adjust their clocks at 0 hour of the given dates.
1501 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1502 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1503 Rule Para 1975 1978 - Mar 1 0:00 0 -
1504 Rule Para 1979 1991 - Apr 1 0:00 0 -
1505 Rule Para 1989 only - Oct 22 0:00 1:00 S
1506 Rule Para 1990 only - Oct 1 0:00 1:00 S
1507 Rule Para 1991 only - Oct 6 0:00 1:00 S
1508 Rule Para 1992 only - Mar 1 0:00 0 -
1509 Rule Para 1992 only - Oct 5 0:00 1:00 S
1510 Rule Para 1993 only - Mar 31 0:00 0 -
1511 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1512 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1513 Rule Para 1996 only - Mar 1 0:00 0 -
1514 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1515 # From Steffen Thorsen (2000-10-02):
1516 # I have three independent reports that Paraguay changed to DST this Sunday
1519 # Translated by Gwillim Law (2001-02-27) from
1520 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1521 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1522 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1523 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1524 # system has been operating for several years. Formerly there was a separate
1525 # decree each year; the new law has the same effect, but permanently. Every
1526 # year, the time will change on the first Sunday of October; likewise, the
1527 # clock will be set back on the first Sunday of March.
1529 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1530 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1531 Rule Para 1997 only - Feb lastSun 0:00 0 -
1532 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1533 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1534 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1535 # From Rives McDow (2002-02-28):
1536 # A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
1537 # dst method to be from the first Sunday in September to the first Sunday in
1539 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1540 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1542 # From Jesper Nørgaard Welen (2005-01-02):
1543 # There are several sources that claim that Paraguay made
1544 # a timezone rule change in autumn 2004.
1545 # From Steffen Thorsen (2005-01-05):
1546 # Decree 1,867 (2004-03-05)
1547 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1548 # http://www.presidencia.gov.py/decretos/D1867.pdf
1549 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 S
1550 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1551 # From Carlos Raúl Perasso (2010-02-18):
1552 # By decree number 3958 issued yesterday
1553 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1554 # Paraguay changes its DST schedule, postponing the March rule to April and
1555 # modifying the October date. The decree reads:
1557 # Art. 1. It is hereby established that from the second Sunday of the month of
1558 # April of this year (2010), the official time is to be set back 60 minutes,
1559 # and that on the first Sunday of the month of October, it is to be set
1560 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1562 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S
1563 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1565 # From Steffen Thorsen (2013-03-07):
1566 # Paraguay will end DST on 2013-03-24 00:00....
1567 # http://www.ande.gov.py/interna.php?id=1075
1569 # From Carlos Raúl Perasso (2013-03-15):
1570 # The change in Paraguay is now final. Decree number 10780
1571 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1572 # From Carlos Raúl Perasso (2014-02-28):
1573 # Decree 1264 can be found at:
1574 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1575 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1577 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1578 Zone America/Asuncion -3:50:40 - LMT 1890
1579 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1580 -4:00 - PYT 1972 Oct # Paraguay Time
1581 -3:00 - PYT 1974 Apr
1586 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1587 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1588 # When we were in Peru in 1985-1986, they apparently switched over
1589 # sometime between December 29 and January 3 while we were on the Amazon.
1591 # From Paul Eggert (2006-03-22):
1592 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1594 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1595 Rule Peru 1938 only - Jan 1 0:00 1:00 S
1596 Rule Peru 1938 only - Apr 1 0:00 0 -
1597 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1598 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1599 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1600 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1601 Rule Peru 1990 only - Jan 1 0:00 1:00 S
1602 Rule Peru 1990 only - Apr 1 0:00 0 -
1603 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1604 Rule Peru 1994 only - Jan 1 0:00 1:00 S
1605 Rule Peru 1994 only - Apr 1 0:00 0 -
1606 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1607 Zone America/Lima -5:08:12 - LMT 1890
1608 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1609 -5:00 Peru PE%sT # Peru Time
1612 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1613 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1614 -2:00 - GST # South Georgia Time
1617 # uninhabited; scientific personnel have wintered
1620 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1621 Zone America/Paramaribo -3:40:40 - LMT 1911
1622 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1623 -3:40:36 - PMT 1945 Oct # The capital moved?
1624 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
1625 -3:30 - SRT 1984 Oct # Suriname Time
1628 # Trinidad and Tobago
1629 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1630 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1633 # These all agree with Trinidad and Tobago since 1970.
1634 Link America/Port_of_Spain America/Anguilla
1635 Link America/Port_of_Spain America/Antigua
1636 Link America/Port_of_Spain America/Dominica
1637 Link America/Port_of_Spain America/Grenada
1638 Link America/Port_of_Spain America/Guadeloupe
1639 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1640 Link America/Port_of_Spain America/Montserrat
1641 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1642 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1643 Link America/Port_of_Spain America/St_Lucia
1644 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1645 Link America/Port_of_Spain America/St_Vincent
1646 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1649 # From Paul Eggert (1993-11-18):
1650 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1651 # From Shanks & Pottenger:
1652 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1653 # Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1654 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1655 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1656 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1657 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1658 # Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1659 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1660 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1661 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1662 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1663 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1664 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1665 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
1666 Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1667 Rule Uruguay 1942 only - Jan 1 0:00 0 -
1668 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1669 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1670 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1671 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1672 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1673 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1674 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1675 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1676 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1677 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1678 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1679 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1680 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1681 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1682 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1683 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1684 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1685 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1686 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1687 Rule Uruguay 1980 only - May 1 0:00 0 -
1688 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1689 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1690 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1691 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1692 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1693 # Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1694 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1695 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1696 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1697 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1698 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1699 # From Eduardo Cota (2004-09-20):
1700 # The Uruguayan government has decreed a change in the local time....
1701 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1702 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1703 # From Steffen Thorsen (2005-03-11):
1704 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1705 # save energy ... it was postponed two weeks....
1706 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1707 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1708 # From Eduardo Cota (2005-09-27):
1709 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1710 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1711 # 02:00 local time, official time in Uruguay will be at GMT -2.
1712 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1713 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1714 # From Jesper Nørgaard Welen (2006-09-06):
1715 # http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1716 Rule Uruguay 2006 max - Oct Sun>=1 2:00 1:00 S
1717 Rule Uruguay 2007 max - Mar Sun>=8 2:00 0 -
1718 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1719 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1720 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1721 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
1726 # From John Stainforth (2007-11-28):
1727 # ... the change for Venezuela originally expected for 2007-12-31 has
1728 # been brought forward to 2007-12-09. The official announcement was
1729 # published today in the "Gaceta Oficial de la República Bolivariana
1730 # de Venezuela, número 38.819" (official document for all laws or
1731 # resolution publication)
1732 # http://www.globovision.com/news.php?nid=72208
1734 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1735 Zone America/Caracas -4:27:44 - LMT 1890
1736 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1737 -4:30 - VET 1965 # Venezuela Time
1738 -4:00 - VET 2007 Dec 9 3:00
projects / dragonfly.git / blob