1 # tzdb data for South America and environs
3 # This file is in the public domain, so clarified as of
4 # 2009-05-17 by Arthur David Olson.
6 # This file is by no means authoritative; if you think you know better,
7 # go ahead and edit the file (and please send any changes to
8 # tz@iana.org for general use in the future). For more, please see
9 # the file CONTRIBUTING in the tz distribution.
11 # From Paul Eggert (2016-12-05):
13 # Unless otherwise specified, the source for data through 1990 is:
14 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
15 # San Diego: ACS Publications, Inc. (2003).
16 # Unfortunately this book contains many errors and cites no sources.
18 # Many years ago Gwillim Law wrote that a good source
19 # for time zone data was the International Air Transport
20 # Association's Standard Schedules Information Manual (IATA SSIM),
21 # published semiannually. Law sent in several helpful summaries
22 # of the IATA's data after 1990. Except where otherwise noted,
23 # IATA SSIM is the source for entries after 1990.
25 # For data circa 1899, a common source is:
26 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
27 # https://www.jstor.org/stable/1774359
29 # These tables use numeric abbreviations like -03 and -0330 for
30 # integer hour and minute UT offsets. Although earlier editions used
31 # alphabetic time zone abbreviations, these abbreviations were
32 # invented and did not reflect common practice.
34 ###############################################################################
36 ###############################################################################
40 # From Bob Devine (1988-01-28):
41 # Argentina: first Sunday in October to first Sunday in April since 1976.
42 # Double Summer time from 1969 to 1974. Switches at midnight.
44 # From U. S. Naval Observatory (1988-01-19):
45 # ARGENTINA 3 H BEHIND UTC
47 # From Hernan G. Otero (1995-06-26):
48 # I am sending modifications to the Argentine time zone table...
49 # AR was chosen because they are the ISO letters that represent Argentina.
51 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
52 Rule Arg 1930 only - Dec 1 0:00 1:00 -
53 Rule Arg 1931 only - Apr 1 0:00 0 -
54 Rule Arg 1931 only - Oct 15 0:00 1:00 -
55 Rule Arg 1932 1940 - Mar 1 0:00 0 -
56 Rule Arg 1932 1939 - Nov 1 0:00 1:00 -
57 Rule Arg 1940 only - Jul 1 0:00 1:00 -
58 Rule Arg 1941 only - Jun 15 0:00 0 -
59 Rule Arg 1941 only - Oct 15 0:00 1:00 -
60 Rule Arg 1943 only - Aug 1 0:00 0 -
61 Rule Arg 1943 only - Oct 15 0:00 1:00 -
62 Rule Arg 1946 only - Mar 1 0:00 0 -
63 Rule Arg 1946 only - Oct 1 0:00 1:00 -
64 Rule Arg 1963 only - Oct 1 0:00 0 -
65 Rule Arg 1963 only - Dec 15 0:00 1:00 -
66 Rule Arg 1964 1966 - Mar 1 0:00 0 -
67 Rule Arg 1964 1966 - Oct 15 0:00 1:00 -
68 Rule Arg 1967 only - Apr 2 0:00 0 -
69 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 -
70 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
71 Rule Arg 1974 only - Jan 23 0:00 1:00 -
72 Rule Arg 1974 only - May 1 0:00 0 -
73 Rule Arg 1988 only - Dec 1 0:00 1:00 -
75 # From Hernan G. Otero (1995-06-26):
76 # These corrections were contributed by InterSoft Argentina S.A.,
77 # obtaining the data from the:
78 # Talleres de Hidrografía Naval Argentina
79 # (Argentine Naval Hydrography Institute)
80 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
81 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 -
83 # From Hernan G. Otero (1995-06-26):
84 # From this moment on, the law that mandated the daylight saving
85 # time corrections was derogated and no more modifications
86 # to the time zones (for daylight saving) are now made.
88 # From Rives McDow (2000-01-10):
89 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
90 # which did not result in the switch of a time zone, as they stayed 9 hours
91 # from the International Date Line.
92 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 -
93 # From Paul Eggert (2007-12-28):
94 # DST was set to expire on March 5, not March 3, but since it was converted
95 # to standard time on March 3 it's more convenient for us to pretend that
96 # it ended on March 3.
97 Rule Arg 2000 only - Mar 3 0:00 0 -
99 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
100 # We just checked with our São Paulo office and they say the government of
101 # Argentina decided not to become one of the countries that go on or off DST.
102 # So Buenos Aires should be -3 hours from GMT at all times.
104 # From Fabián L. Arce Jofré (2000-04-04):
105 # The law that claimed DST for Argentina was derogated by President Fernando
106 # de la Rúa on March 2, 2000, because it would make people spend more energy
107 # in the winter time, rather than less. The change took effect on March 3.
109 # From Mariano Absatz (2001-06-06):
110 # one of the major newspapers here in Argentina said that the 1999
111 # Timezone Law (which never was effectively applied) will (would?) be
112 # in effect.... The article is at
113 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
114 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted
115 # 1999-09-17, and published 1999-09-21. The official publication is at:
116 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
117 # Regretfully, you have to subscribe (and pay) for the on-line version....
120 # the timezone for Argentina will not change next Sunday.
121 # Apparently it will do so on Sunday 24th....
122 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
125 # Last Friday (yes, the last working day before the date of the change), the
126 # Senate annulled the 1999 law that introduced the changes later postponed.
127 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
128 # It remains the vote of the Deputies..., but it will be the same....
129 # This kind of things had always been done this way in Argentina.
130 # We are still -03:00 all year round in all of the country.
132 # From Steffen Thorsen (2007-12-21):
133 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
134 # all of the country (all Zone-entries) are affected. News reports like
135 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
136 # that Argentina will use DST next year as well, from October to
137 # March, although exact rules are not given.
139 # From Jesper Nørgaard Welen (2007-12-26)
140 # The last hurdle of Argentina DST is over, the proposal was approved in
141 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
142 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
143 # the original scanned proposal, where the dates and the zero hours are
144 # clear and unambiguous...This is the article about final approval:
145 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
147 # From Paul Eggert (2007-12-22):
148 # For dates after mid-2008, the following rules are my guesses and
149 # are quite possibly wrong, but are more likely than no DST at all.
151 # From Alexander Krivenyshev (2008-09-05):
152 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
153 # Argentina will start DST on Sunday October 19, 2008.
155 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
156 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
158 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07)
159 # via Rodrigo Severo:
160 # Argentinian law No. 25.155 is no longer valid.
161 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
162 # The new one is law No. 26.350
163 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
164 # So there is no summer time in Argentina for now.
166 # From Mariano Absatz (2008-10-20):
167 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
168 # in Argentina from 2008-10-19 until 2009-03-15.
169 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
172 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
173 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
174 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
175 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
177 # Press release 235 dated Saturday October 18th, from the Government of the
178 # Province of Jujuy saying it will not apply DST either (even when it was not
179 # included in Decree 1705/2008).
180 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
182 # From fullinet (2009-10-18):
184 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
185 # (an official .gob.ar) under title: "Sin Cambio de Hora"
186 # (English: "No hour change").
188 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
189 # oficial, decisión que estaba en estudio para su implementación el
190 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
191 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
192 # la modificación del huso horario, ya que 2009 nos encuentra con
193 # crecimiento en la producción y distribución energética."
195 Rule Arg 2007 only - Dec 30 0:00 1:00 -
196 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
197 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 -
199 # From Mariano Absatz (2004-05-21):
200 # Today it was officially published that the Province of Mendoza is changing
201 # its timezone this winter... starting tomorrow night....
202 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
203 # From Paul Eggert (2004-05-24):
204 # It's Law No. 7,210. This change is due to a public power emergency, so for
205 # now we'll assume it's for this year only.
207 # From Paul Eggert (2018-01-31):
208 # Hora de verano para la República Argentina
209 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
210 # says that standard time in Argentina from 1894-10-31
211 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
212 # over Shanks & Pottenger. It is upward compatible with Milne, who
213 # says Córdoba time was -4:16:48.2.
216 # From Mariano Absatz (2004-06-05):
217 # These media articles from a major newspaper mostly cover the current state:
218 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
219 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
221 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
222 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
223 # Apparently, all nine provinces would go back to UTC-03:00 at the same
224 # time in October 17th.
226 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
227 # Tierra del Fuego, Tucumán.
229 # From Mariano Absatz (2004-06-14):
230 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
231 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
232 # annoyance with the change is much higher than the power savings obtained....
234 # From Gwillim Law (2004-06-14):
235 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
236 # "The time change in Tierra del Fuego was a conflicted decision from
237 # the start. The government had decreed that the measure would take
238 # effect on June 1, but a normative error forced the new time to begin
239 # three days earlier, from a Saturday to a Sunday....
240 # Our understanding was that the change was originally scheduled to take place
241 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
242 # provinces). Sunday was May 30, only two days earlier. So the article
243 # contains a contradiction. I would give more credence to the Saturday/Sunday
244 # date than the "three days earlier" phrase, and conclude that Tierra del
245 # Fuego set its clocks back at 2004-05-30 00:00.
247 # From Steffen Thorsen (2004-10-05):
248 # The previous law 7210 which changed the province of Mendoza's time zone
249 # back in May have been modified slightly in a new law 7277, which set the
250 # new end date to 2004-09-26 (original date was 2004-10-17).
251 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
253 # From Mariano Absatz (2004-10-05):
254 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
255 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00
256 # at midnight between Saturday, July 24th and Sunday, July 25th....
257 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
258 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
259 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
261 # From Alex Krivenyshev (2008-01-17):
262 # Here are articles that Argentina Province San Luis is planning to end DST
263 # as earlier as upcoming Monday January 21, 2008 or February 2008:
265 # Provincia argentina retrasa reloj y marca diferencia con resto del país
266 # (Argentine Province delayed clock and mark difference with the rest of the
268 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
270 # Es inminente que en San Luis atrasen una hora los relojes
271 # (It is imminent in San Luis clocks one hour delay)
272 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
273 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html
275 # From Jesper Nørgaard Welen (2008-01-18):
276 # The page of the San Luis provincial government
277 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
278 # confirms what Alex Krivenyshev has earlier sent to the tz
279 # emailing list about that San Luis plans to return to standard
280 # time much earlier than the rest of the country. It also
281 # confirms that upon request the provinces San Juan and Mendoza
282 # refused to follow San Luis in this change.
284 # The change is supposed to take place Monday the 21st at 0:00
285 # hours. As far as I understand it if this goes ahead, we need
286 # a new timezone for San Luis (although there are also documented
287 # independent changes in the southamerica file of San Luis in
288 # 1990 and 1991 which has not been confirmed).
290 # From Jesper Nørgaard Welen (2008-01-25):
291 # Unfortunately the below page has become defunct, about the San Luis
292 # time change. Perhaps because it now is part of a group of pages "Most
293 # important pages of 2008."
296 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
297 # instead it seems. Or use "Buscador" from the main page of the San Luis
298 # government, and fill in "huso" and click OK, and you will get 3 pages
299 # from which the first one is identical to the above.
301 # From Mariano Absatz (2008-01-28):
302 # I can confirm that the Province of San Luis (and so far only that
303 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
304 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
305 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
306 # (that is, unless they change their mind any minute now).
308 # So we'll have to add yet another city to 'southamerica' (I think San
309 # Luis city is the mos populated city in the Province, so it'd be
310 # America/Argentina/San_Luis... of course I can't remember if San Luis's
311 # history of particular changes goes along with Mendoza or San Juan :-(
312 # (I only remember not being able to collect hard facts about San Luis
313 # back in 2004, when these provinces changed to UTC-4 for a few days, I
314 # mailed them personally and never got an answer).
316 # From Paul Eggert (2014-08-12):
317 # Unless otherwise specified, data entries are from Shanks & Pottenger through
318 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that
319 # America/Cordoba split into 6 subregions during 1991/1992, one of which
320 # was America/San_Luis, but we haven't verified this yet so for now we'll
321 # keep America/Cordoba a single region rather than splitting it into the
322 # other 5 subregions.
324 # From Mariano Absatz (2009-03-13):
325 # Yesterday (with our usual 2-day notice) the Province of San Luis
326 # decided that next Sunday instead of "staying" @utc-03:00 they will go
327 # to utc-04:00 until the second Saturday in October...
329 # The press release is at
330 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
331 # (I couldn't find the decree, but www.sanluis.gov.ar
332 # is the official page for the Province Government.)
334 # There's also a note in only one of the major national papers ...
335 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
337 # The press release says [quick and dirty translation]:
338 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
339 # inhabitants) will have to turn back one hour their clocks
341 # Since then, San Luis will establish its own Province timezone. Thus,
342 # during 2009, this timezone change will run from 00:00 the third Sunday
343 # in March until 24:00 of the second Saturday in October.
345 # From Mariano Absatz (2009-10-16):
346 # ...the Province of San Luis is a case in itself.
349 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
350 # is ambiguous because establishes a calendar from the 2nd Sunday in
351 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
352 # complement of that starting on the 2nd Sunday of March at 0:00 and
353 # ending on the 2nd Saturday of March at 24:00.
355 # This clearly breaks every time the 1st of March or October is a Sunday.
357 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
358 # Sunday of October and March.
360 # The problem is that the changes in the rest of the Provinces that did
361 # change in 2007/2008, were made according to the Federal Law and Decrees
362 # that did so on the 3rd Sunday of October and March.
364 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
365 # (October 11th) at 0:00.
367 # So I guess a new set of rules, besides "Arg", must be made and the last
368 # America/Argentina/San_Luis entries should change to use these...
371 # From Alexander Krivenyshev (2010-04-09):
372 # According to news reports from El Diario de la República Province San
373 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
374 # after April 11, 2010 - will continue to have same time as rest of
375 # Argentina (UTC-3) (no DST).
377 # Confirmaron la prórroga del huso horario de verano (Spanish)
378 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
379 # or (some English translation):
380 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
382 # From Mariano Absatz (2010-04-12):
383 # yes...I can confirm this...and given that San Luis keeps calling
384 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
385 # rules...San Luis is still using "Western ARgentina Time" and it got
386 # stuck on Summer daylight savings time even though the summer is over.
388 # From Paul Eggert (2018-01-23):
389 # Perhaps San Luis operates on the legal fiction that it is at -04
390 # with perpetual daylight saving time, but ordinary usage typically seems to
391 # just say it's at -03; see, for example,
392 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
393 # We've documented similar situations as being plain changes to
394 # standard time, so let's do that here too. This does not change UTC
395 # offsets, only tm_isdst and the time zone abbreviations. One minor
396 # plus is that this silences a zic complaint that there's no POSIX TZ
397 # setting for timestamps past 2038.
399 # Zone NAME STDOFF RULES FORMAT [UNTIL]
401 # Buenos Aires (BA), Capital Federal (CF),
402 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
403 -4:16:48 - CMT 1920 May # Córdoba Mean Time
405 -4:00 Arg -04/-03 1969 Oct 5
406 -3:00 Arg -03/-02 1999 Oct 3
407 -4:00 Arg -04/-03 2000 Mar 3
410 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
411 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
413 # Shanks & Pottenger also make the following claims, which we haven't verified:
414 # - Formosa switched to -3:00 on 1991-01-07.
415 # - Misiones switched to -3:00 on 1990-12-29.
416 # - Chaco switched to -3:00 on 1991-01-04.
417 # - Santiago del Estero switched to -4:00 on 1991-04-01,
418 # then to -3:00 on 1991-04-26.
420 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31
421 -4:16:48 - CMT 1920 May
423 -4:00 Arg -04/-03 1969 Oct 5
424 -3:00 Arg -03/-02 1991 Mar 3
425 -4:00 - -04 1991 Oct 20
426 -3:00 Arg -03/-02 1999 Oct 3
427 -4:00 Arg -04/-03 2000 Mar 3
430 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
431 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31
432 -4:16:48 - CMT 1920 May
434 -4:00 Arg -04/-03 1969 Oct 5
435 -3:00 Arg -03/-02 1991 Mar 3
436 -4:00 - -04 1991 Oct 20
437 -3:00 Arg -03/-02 1999 Oct 3
438 -4:00 Arg -04/-03 2000 Mar 3
439 -3:00 Arg -03/-02 2008 Oct 18
443 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31
444 -4:16:48 - CMT 1920 May
446 -4:00 Arg -04/-03 1969 Oct 5
447 -3:00 Arg -03/-02 1991 Mar 3
448 -4:00 - -04 1991 Oct 20
449 -3:00 Arg -03/-02 1999 Oct 3
450 -4:00 Arg -04/-03 2000 Mar 3
451 -3:00 - -03 2004 Jun 1
452 -4:00 - -04 2004 Jun 13
456 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31
457 -4:16:48 - CMT 1920 May
459 -4:00 Arg -04/-03 1969 Oct 5
460 -3:00 Arg -03/-02 1991 Mar 1
461 -4:00 - -04 1991 May 7
462 -3:00 Arg -03/-02 1999 Oct 3
463 -4:00 Arg -04/-03 2000 Mar 3
464 -3:00 - -03 2004 Jun 1
465 -4:00 - -04 2004 Jun 20
466 -3:00 Arg -03/-02 2008 Oct 18
470 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31
471 -4:16:48 - CMT 1920 May
473 -4:00 Arg -04/-03 1969 Oct 5
474 -3:00 Arg -03/-02 1991 Mar 1
475 -4:00 - -04 1991 May 7
476 -3:00 Arg -03/-02 1999 Oct 3
477 -4:00 Arg -04/-03 2000 Mar 3
478 -3:00 - -03 2004 May 31
479 -4:00 - -04 2004 Jul 25
480 -3:00 Arg -03/-02 2008 Oct 18
484 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31
485 -4:16:48 - CMT 1920 May
487 -4:00 Arg -04/-03 1969 Oct 5
488 -3:00 Arg -03/-02 1990 Mar 4
489 -4:00 - -04 1990 Oct 28
490 -4:00 1:00 -03 1991 Mar 17
491 -4:00 - -04 1991 Oct 6
493 -3:00 Arg -03/-02 1999 Oct 3
494 -4:00 Arg -04/-03 2000 Mar 3
495 -3:00 Arg -03/-02 2008 Oct 18
498 # Catamarca (CT), Chubut (CH)
499 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31
500 -4:16:48 - CMT 1920 May
502 -4:00 Arg -04/-03 1969 Oct 5
503 -3:00 Arg -03/-02 1991 Mar 3
504 -4:00 - -04 1991 Oct 20
505 -3:00 Arg -03/-02 1999 Oct 3
506 -4:00 Arg -04/-03 2000 Mar 3
507 -3:00 - -03 2004 Jun 1
508 -4:00 - -04 2004 Jun 20
509 -3:00 Arg -03/-02 2008 Oct 18
513 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
514 -4:16:48 - CMT 1920 May
516 -4:00 Arg -04/-03 1969 Oct 5
517 -3:00 Arg -03/-02 1990 Mar 4
518 -4:00 - -04 1990 Oct 15
519 -4:00 1:00 -03 1991 Mar 1
520 -4:00 - -04 1991 Oct 15
521 -4:00 1:00 -03 1992 Mar 1
522 -4:00 - -04 1992 Oct 18
523 -3:00 Arg -03/-02 1999 Oct 3
524 -4:00 Arg -04/-03 2000 Mar 3
525 -3:00 - -03 2004 May 23
526 -4:00 - -04 2004 Sep 26
527 -3:00 Arg -03/-02 2008 Oct 18
532 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
533 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 -
535 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
536 -4:16:48 - CMT 1920 May
538 -4:00 Arg -04/-03 1969 Oct 5
539 -3:00 Arg -03/-02 1990
540 -3:00 1:00 -02 1990 Mar 14
541 -4:00 - -04 1990 Oct 15
542 -4:00 1:00 -03 1991 Mar 1
543 -4:00 - -04 1991 Jun 1
544 -3:00 - -03 1999 Oct 3
545 -4:00 1:00 -03 2000 Mar 3
546 -3:00 - -03 2004 May 31
547 -4:00 - -04 2004 Jul 25
548 -3:00 Arg -03/-02 2008 Jan 21
549 -4:00 SanLuis -04/-03 2009 Oct 11
553 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
554 -4:16:48 - CMT 1920 May
556 -4:00 Arg -04/-03 1969 Oct 5
557 -3:00 Arg -03/-02 1999 Oct 3
558 -4:00 Arg -04/-03 2000 Mar 3
559 -3:00 - -03 2004 Jun 1
560 -4:00 - -04 2004 Jun 20
561 -3:00 Arg -03/-02 2008 Oct 18
564 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
565 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
566 -4:16:48 - CMT 1920 May
568 -4:00 Arg -04/-03 1969 Oct 5
569 -3:00 Arg -03/-02 1999 Oct 3
570 -4:00 Arg -04/-03 2000 Mar 3
571 -3:00 - -03 2004 May 30
572 -4:00 - -04 2004 Jun 20
573 -3:00 Arg -03/-02 2008 Oct 18
577 Link America/Curacao America/Aruba
580 # Zone NAME STDOFF RULES FORMAT [UNTIL]
581 Zone America/La_Paz -4:32:36 - LMT 1890
582 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
583 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
588 # From Paul Eggert (1993-11-18):
589 # The mayor of Rio recently attempted to change the time zone rules
590 # just in his city, in order to leave more summer time for the tourist trade.
591 # The rule change lasted only part of the day;
592 # the federal government refused to follow the city's rules, and business
593 # was in a chaos, so the mayor backed down that afternoon.
595 # From IATA SSIM (1996-02):
596 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
597 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
598 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
599 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
600 # [The last three states are new to this issue of the IATA SSIM.]
602 # From Gwillim Law (1996-10-07):
603 # Geography, history (Tocantins was part of Goiás until 1989), and other
604 # sources of time zone information lead me to believe that AL, SE, and TO were
605 # always in BR1, and so the only change was whether or not they observed DST....
606 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
607 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
608 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
609 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
610 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
611 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
612 # become part of the state of Pernambuco). The boundary between BR1 and BR2
613 # has never been clearly stated. They've simply been called East and West.
614 # However, some conclusions can be drawn from another IATA manual: the Airline
615 # Coding Directory, which lists close to 400 airports in Brazil. For each
616 # airport it gives a time zone which is coded to the SSIM. From that
617 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
618 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
619 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
621 # From Marcos Tadeu (1998-09-27):
622 # Brazilian official page <http://pcdsh01.on.br/verao1.html>
624 # From Jesper Nørgaard (2000-11-03):
625 # [For an official list of which regions in Brazil use which time zones, see:]
626 # http://pcdsh01.on.br/Fusbr.htm
627 # http://pcdsh01.on.br/Fusbrhv.htm
629 # From Celso Doria via David Madeo (2002-10-09):
630 # The reason for the delay this year has to do with elections in Brazil.
632 # Unlike in the United States, elections in Brazil are 100% computerized and
633 # the results are known almost immediately. Yesterday, it was the first
634 # round of the elections when 115 million Brazilians voted for President,
635 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
636 # counting (or re-counting) votes anymore and we know there will be a second
637 # round for the Presidency and also for some Governors. The 2nd round will
638 # take place on October 27th.
640 # The reason why the DST will only begin November 3rd is that the thousands
641 # of electoral machines used cannot have their time changed, and since the
642 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
643 # the Government decided to postpone DST, instead of changing the Constitution
644 # (maybe, for the next elections, it will be possible to change the clock)...
646 # From Rodrigo Severo (2004-10-04):
647 # It's just the biannual change made necessary by the much hyped, supposedly
648 # modern Brazilian eletronic voting machines which, apparently, can't deal
649 # with a time change between the first and the second rounds of the elections.
651 # From Steffen Thorsen (2007-09-20):
652 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
653 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
655 # From Paul Schulze (2008-06-24):
656 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
657 # Oficial da União"...) in Brazil there are changes in the timezones,
658 # effective today (00:00am at June 24, 2008) as follows:
660 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
661 # part of the Amazonas state that had this timezone now being put to the
663 # b) The whole Pará state now is put at timezone UTC+3, instead of just
664 # part of it, as was before.
666 # This change follows a proposal of senator Tiao Viana of Acre state, that
667 # proposed it due to concerns about open television channels displaying
668 # programs inappropriate to youths in the states that had the timezone
669 # UTC+5 too early in the night. In the occasion, some more corrections
670 # were proposed, trying to unify the timezones of any given state. This
671 # change modifies timezone rules defined in decree 2.784 of 18 June,
674 # From Rodrigo Severo (2008-06-24):
675 # Just correcting the URL:
676 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
678 # As a result of the above Decree I believe the America/Rio_Branco
679 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
680 # be created to represent the...west side of the Pará State. I
681 # suggest this new timezone be called Santarem as the most
682 # important/populated city in the affected area.
684 # This new timezone would be the same as the Rio_Branco timezone up to
685 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
687 # From Alex Krivenyshev (2008-06-24):
688 # This is a quick reference page for New and Old Brazil Time Zones map.
689 # http://www.worldtimezone.com/brazil-time-new-old.php
691 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
692 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
693 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
695 # From Paul Eggert (2002-10-10):
696 # The official decrees referenced below are mostly taken from
697 # Decretos sobre o Horário de Verão no Brasil.
698 # http://pcdsh01.on.br/DecHV.html
700 # From Steffen Thorsen (2008-08-29):
701 # As announced by the government and many newspapers in Brazil late
702 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
703 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
704 # past years experience with the elections, there was a good chance that
705 # the start was postponed to November, but it did not happen this year.
707 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
709 # An official page about it:
710 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
711 # Note that this link does not always work directly, but must be accessed
713 # http://www.mme.gov.br/first
715 # One example link that works directly:
716 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
719 # We have a written a short article about it as well:
720 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
722 # From Alexander Krivenyshev (2011-10-04):
723 # State Bahia will return to Daylight savings time this year after 8 years off.
724 # The announcement was made by Governor Jaques Wagner in an interview to a
725 # television station in Salvador.
728 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
729 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
731 # From Guilherme Bernardes Rodrigues (2011-10-07):
732 # There is news in the media, however there is still no decree about it.
733 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
734 # official agency about time in Brazil, and she confirmed that the old rule is
737 # From Guilherme Bernardes Rodrigues (2011-10-14)
738 # It's official, the President signed a decree that includes Bahia in summer
740 # [ and in a second message (same day): ]
741 # I found the decree.
743 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011
745 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
747 # From Kelley Cook (2012-10-16):
748 # The governor of state of Bahia in Brazil announced on Thursday that
749 # due to public pressure, he is reversing the DST policy they implemented
750 # last year and will not be going to Summer Time on October 21st....
751 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
753 # From Rodrigo Severo (2012-10-16):
754 # Tocantins state will have DST.
755 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
757 # From Steffen Thorsen (2013-09-20):
758 # Tocantins in Brazil is very likely not to observe DST from October....
759 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
760 # We will keep this article updated when this is confirmed:
761 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
763 # From Steffen Thorsen (2013-10-17):
764 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
765 # Senator Jorge Viana announced that Acre will change time zone on November 10.
766 # He did not specify the time of the change, nor if western parts of Amazonas
767 # will change as well.
769 # From Paul Eggert (2013-10-17):
770 # For now, assume western Amazonas will change as well.
772 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
773 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
774 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
775 Rule Brazil 1931 only - Oct 3 11:00 1:00 -
776 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
777 Rule Brazil 1932 only - Oct 3 0:00 1:00 -
778 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
780 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
781 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
782 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 -
783 Rule Brazil 1950 only - Apr 16 1:00 0 -
784 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
785 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
786 Rule Brazil 1953 only - Mar 1 0:00 0 -
787 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
789 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
790 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
791 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
792 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
793 # extended the above decree to all of the national territory on 12-09.
794 Rule Brazil 1963 only - Dec 9 0:00 1:00 -
795 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
796 # extended summer time by one day to 1964-03-01 00:00 (start of school).
797 Rule Brazil 1964 only - Mar 1 0:00 0 -
798 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
799 Rule Brazil 1965 only - Jan 31 0:00 1:00 -
800 Rule Brazil 1965 only - Mar 31 0:00 0 -
801 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
802 Rule Brazil 1965 only - Dec 1 0:00 1:00 -
803 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
804 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
805 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 -
806 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
808 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
809 Rule Brazil 1985 only - Nov 2 0:00 1:00 -
810 # Decree 92,310 (1986-01-21)
811 # Decree 92,463 (1986-03-13)
812 Rule Brazil 1986 only - Mar 15 0:00 0 -
813 # Decree 93,316 (1986-10-01)
814 Rule Brazil 1986 only - Oct 25 0:00 1:00 -
815 Rule Brazil 1987 only - Feb 14 0:00 0 -
816 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
817 Rule Brazil 1987 only - Oct 25 0:00 1:00 -
818 Rule Brazil 1988 only - Feb 7 0:00 0 -
819 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
820 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
821 Rule Brazil 1988 only - Oct 16 0:00 1:00 -
822 Rule Brazil 1989 only - Jan 29 0:00 0 -
823 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
824 # with the same exceptions
825 Rule Brazil 1989 only - Oct 15 0:00 1:00 -
826 Rule Brazil 1990 only - Feb 11 0:00 0 -
827 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
828 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
829 # Decree 99,629 (1990-10-19) adds BA, MT.
830 Rule Brazil 1990 only - Oct 21 0:00 1:00 -
831 Rule Brazil 1991 only - Feb 17 0:00 0 -
832 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
833 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
834 Rule Brazil 1991 only - Oct 20 0:00 1:00 -
835 Rule Brazil 1992 only - Feb 9 0:00 0 -
836 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
837 # adopted by same states.
838 Rule Brazil 1992 only - Oct 25 0:00 1:00 -
839 Rule Brazil 1993 only - Jan 31 0:00 0 -
840 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
841 # adopted by same states, plus AM.
842 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
843 # web page corrected 2004-01-07) adopted by same states, minus AM.
844 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
845 # adopted by same states, plus MT and TO.
846 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
848 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 -
849 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
850 Rule Brazil 1996 only - Feb 11 0:00 0 -
851 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
852 # adopted by same states, minus AL, SE.
853 Rule Brazil 1996 only - Oct 6 0:00 1:00 -
854 Rule Brazil 1997 only - Feb 16 0:00 0 -
855 # From Daniel C. Sobral (1998-02-12):
856 # In 1997, the DS began on October 6. The stated reason was that
857 # because international television networks ignored Brazil's policy on DS,
858 # they bought the wrong times on satellite for coverage of Pope's visit.
859 # This year, the ending date of DS was postponed to March 1
860 # to help dealing with the shortages of electric power.
862 # Decree 2,317 (1997-09-04), adopted by same states.
863 Rule Brazil 1997 only - Oct 6 0:00 1:00 -
864 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
866 Rule Brazil 1998 only - Mar 1 0:00 0 -
867 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
868 # adopted by the same states as before.
869 Rule Brazil 1998 only - Oct 11 0:00 1:00 -
870 Rule Brazil 1999 only - Feb 21 0:00 0 -
871 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
872 # (1999-08-23) adopted by same states.
873 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
874 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
875 Rule Brazil 1999 only - Oct 3 0:00 1:00 -
876 Rule Brazil 2000 only - Feb 27 0:00 0 -
877 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
878 # adopted by the same states as before.
879 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
880 # repeals DST in PE and RR, effective 2000-10-15 00:00.
881 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
882 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
883 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
884 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
885 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 -
886 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
887 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
888 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
889 Rule Brazil 2002 only - Nov 3 0:00 1:00 -
890 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
891 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
892 Rule Brazil 2003 only - Oct 19 0:00 1:00 -
893 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
894 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
895 Rule Brazil 2004 only - Nov 2 0:00 1:00 -
896 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
897 # adopted by the same states as before.
898 Rule Brazil 2005 only - Oct 16 0:00 1:00 -
899 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
900 # adopted by the same states as before.
901 Rule Brazil 2006 only - Nov 5 0:00 1:00 -
902 Rule Brazil 2007 only - Feb 25 0:00 0 -
903 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
904 # adopted by the same states as before.
905 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 -
906 # From Frederico A. C. Neves (2008-09-10):
907 # According to this decree
908 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
909 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
910 # 3rd Feb Sunday. There is an exception on the return date when this is
911 # the Carnival Sunday then the return date will be the next Sunday...
912 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 -
913 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
914 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
916 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
917 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
918 # removed Bahia and added Tocantins.
919 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
921 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
922 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
923 Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 -
924 # From Steffen Thorsen (2017-12-18):
925 # According to many media sources, next year's DST start in Brazil will move to
926 # the first Sunday of November
927 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
928 # From Steffen Thorsen (2017-12-20):
929 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
930 # From Fábio Gomes (2018-10-04):
931 # The Brazilian president just announced a new change on this year DST.
932 # It was scheduled to start on November 4th and it was changed to November 18th.
933 # From Rodrigo Brüning Wessler (2018-10-15):
934 # The Brazilian government just announced that the change in DST was
935 # canceled.... Maybe the president Michel Temer also woke up one hour
937 Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 -
938 # The last ruleset listed above says that the following states observed DST:
939 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
941 # From Steffen Thorsen (2019-04-05):
942 # According to multiple sources the Brazilian president wants to get rid of DST.
943 # https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano
944 # https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml
945 # From Marcus Diniz (2019-04-25):
946 # Brazil no longer has DST changes - decree signed today
947 # https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml
948 # From Daniel Soares de Oliveira (2019-04-26):
949 # http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm
951 # Zone NAME STDOFF RULES FORMAT [UNTIL]
953 # Fernando de Noronha (administratively part of PE)
954 Zone America/Noronha -2:09:40 - LMT 1914
955 -2:00 Brazil -02/-01 1990 Sep 17
956 -2:00 - -02 1999 Sep 30
957 -2:00 Brazil -02/-01 2000 Oct 15
958 -2:00 - -02 2001 Sep 13
959 -2:00 Brazil -02/-01 2002 Oct 1
961 # Other Atlantic islands have no permanent settlement.
962 # These include Trindade and Martim Vaz (administratively part of ES),
963 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
964 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
965 # it also included the Penedos.
967 # Amapá (AP), east Pará (PA)
968 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
969 # The division between east and west Pará is the river Xingu.
970 # In the north a very small part from the river Javary (now Jari I guess,
971 # the border with Amapá) to the Amazon, then to the Xingu.
972 Zone America/Belem -3:13:56 - LMT 1914
973 -3:00 Brazil -03/-02 1988 Sep 12
977 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
978 Zone America/Santarem -3:38:48 - LMT 1914
979 -4:00 Brazil -04/-03 1988 Sep 12
980 -4:00 - -04 2008 Jun 24 0:00
983 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
985 Zone America/Fortaleza -2:34:00 - LMT 1914
986 -3:00 Brazil -03/-02 1990 Sep 17
987 -3:00 - -03 1999 Sep 30
988 -3:00 Brazil -03/-02 2000 Oct 22
989 -3:00 - -03 2001 Sep 13
990 -3:00 Brazil -03/-02 2002 Oct 1
993 # Pernambuco (PE) (except Atlantic islands)
994 Zone America/Recife -2:19:36 - LMT 1914
995 -3:00 Brazil -03/-02 1990 Sep 17
996 -3:00 - -03 1999 Sep 30
997 -3:00 Brazil -03/-02 2000 Oct 15
998 -3:00 - -03 2001 Sep 13
999 -3:00 Brazil -03/-02 2002 Oct 1
1003 Zone America/Araguaina -3:12:48 - LMT 1914
1004 -3:00 Brazil -03/-02 1990 Sep 17
1005 -3:00 - -03 1995 Sep 14
1006 -3:00 Brazil -03/-02 2003 Sep 24
1007 -3:00 - -03 2012 Oct 21
1008 -3:00 Brazil -03/-02 2013 Sep
1011 # Alagoas (AL), Sergipe (SE)
1012 Zone America/Maceio -2:22:52 - LMT 1914
1013 -3:00 Brazil -03/-02 1990 Sep 17
1014 -3:00 - -03 1995 Oct 13
1015 -3:00 Brazil -03/-02 1996 Sep 4
1016 -3:00 - -03 1999 Sep 30
1017 -3:00 Brazil -03/-02 2000 Oct 22
1018 -3:00 - -03 2001 Sep 13
1019 -3:00 Brazil -03/-02 2002 Oct 1
1023 # There are too many Salvadors elsewhere, so use America/Bahia instead
1024 # of America/Salvador.
1025 Zone America/Bahia -2:34:04 - LMT 1914
1026 -3:00 Brazil -03/-02 2003 Sep 24
1027 -3:00 - -03 2011 Oct 16
1028 -3:00 Brazil -03/-02 2012 Oct 21
1031 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
1032 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
1033 # Santa Catarina (SC), Rio Grande do Sul (RS)
1034 Zone America/Sao_Paulo -3:06:28 - LMT 1914
1035 -3:00 Brazil -03/-02 1963 Oct 23 0:00
1037 -3:00 Brazil -03/-02
1039 # Mato Grosso do Sul (MS)
1040 Zone America/Campo_Grande -3:38:28 - LMT 1914
1041 -4:00 Brazil -04/-03
1044 Zone America/Cuiaba -3:44:20 - LMT 1914
1045 -4:00 Brazil -04/-03 2003 Sep 24
1046 -4:00 - -04 2004 Oct 1
1047 -4:00 Brazil -04/-03
1050 Zone America/Porto_Velho -4:15:36 - LMT 1914
1051 -4:00 Brazil -04/-03 1988 Sep 12
1055 Zone America/Boa_Vista -4:02:40 - LMT 1914
1056 -4:00 Brazil -04/-03 1988 Sep 12
1057 -4:00 - -04 1999 Sep 30
1058 -4:00 Brazil -04/-03 2000 Oct 15
1061 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
1062 # The great circle line from Tabatinga to Porto Acre divides
1063 # east from west Amazonas.
1064 Zone America/Manaus -4:00:04 - LMT 1914
1065 -4:00 Brazil -04/-03 1988 Sep 12
1066 -4:00 - -04 1993 Sep 28
1067 -4:00 Brazil -04/-03 1994 Sep 22
1070 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
1071 # Eirunepé, Envira, Ipixuna
1072 Zone America/Eirunepe -4:39:28 - LMT 1914
1073 -5:00 Brazil -05/-04 1988 Sep 12
1074 -5:00 - -05 1993 Sep 28
1075 -5:00 Brazil -05/-04 1994 Sep 22
1076 -5:00 - -05 2008 Jun 24 0:00
1077 -4:00 - -04 2013 Nov 10
1081 Zone America/Rio_Branco -4:31:12 - LMT 1914
1082 -5:00 Brazil -05/-04 1988 Sep 12
1083 -5:00 - -05 2008 Jun 24 0:00
1084 -4:00 - -04 2013 Nov 10
1089 # From Paul Eggert (2015-04-03):
1090 # Shanks & Pottenger says America/Santiago introduced standard time in
1091 # 1890 and rounds its UT offset to 70W40; guess that in practice this
1092 # was the same offset as in 1916-1919. It also says Pacific/Easter
1093 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1095 # Dates for America/Santiago from 1910 to 2004 are primarily from
1096 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1098 # http://www.webexhibits.org/daylightsaving/chile.html
1099 # This contains a copy of this official table:
1100 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1101 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1102 # [1] needs several corrections, though.
1104 # The first set of corrections is from:
1105 # [2] History of the Official Time of Chile
1106 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1107 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1108 # This is an English translation of:
1109 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1110 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1111 # A fancier Spanish version (requiring mouse-clicking) is at:
1112 # http://www.horaoficial.cl/historia_hora.html
1113 # Conflicts between [1] and [2] were resolved as follows:
1115 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
1116 # Boletín No. 1, Aviso No. 1 (1910). Go with [2].
1118 # - [1] says SMT was -4:42:45, [2] says Chile's official time from
1119 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
1120 # Astronomical Observatory (OAN), then located in what is now
1121 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
1123 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
1124 # Boletín No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2].
1126 # - [1] does not give times for transitions; assume they occur
1127 # at midnight mainland time, the current common practice. However,
1128 # go with [2]'s specification of 23:00 for the 1947-05-21 transition.
1130 # Another correction to [1] is from Jesper Nørgaard Welen, who
1131 # wrote (2006-10-08), "I think that there are some obvious mistakes in
1132 # the suggested link from Oscar van Vlijmen,... for instance entry 66
1133 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
1134 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
1135 # respectively), but anyhow it clears up some doubts too."
1137 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
1138 # Pottenger. After that, for lack of better info assume
1139 # Pacific/Easter is always two hours behind America/Santiago;
1140 # this is known to work for DST transitions starting in 2008 and
1141 # may well be true for earlier transitions.
1143 # From Eduardo Krell (1995-10-19):
1144 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
1145 # of October.... The law is the same for March and October.
1147 # Because of the drought this year, the government decided to go into
1148 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
1149 # (unless there's another dry season next year, I guess).
1151 # From Julio I. Pacheco Troncoso (1999-03-18):
1152 # Because of the same drought, the government decided to end DST later,
1153 # on April 3, (one-time change).
1155 # From Germán Poo-Caamaño (2008-03-03):
1156 # Due to drought, Chile extends Daylight Time in three weeks. This
1157 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
1158 # and Saturday 3/29 at 22:00 for Pacific/Easter)
1159 # The Supreme Decree is located at
1160 # http://www.shoa.cl/servicios/supremo316.pdf
1162 # From José Miguel Garrido (2008-03-05):
1163 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
1165 # From Angel Chiang (2010-03-04):
1166 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
1167 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
1169 # From Arthur David Olson (2010-03-06):
1170 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
1172 # From Glenn Eychaner (2011-03-28):
1173 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
1175 # Chile's clocks will go back an hour this year on the 7th of May instead
1176 # of this Saturday. They will go forward again the 3rd Saturday in
1177 # August, not in October as they have since 1968.
1179 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
1180 # As stated in the website of the Chilean Energy Ministry
1181 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
1182 # The Chilean Government has decided to postpone the entrance into winter time
1183 # (to leave DST) from March 11 2012 to April 28th 2012....
1184 # Quote from the website communication:
1186 # 6. For the year 2012, the dates of entry into winter time will be as follows:
1187 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
1188 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
1190 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
1191 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
1192 # 01:00 on September 2.
1194 # From Steffen Thorsen (2013-02-15):
1195 # According to several news sources, Chile has extended DST this year,
1196 # they will end DST later and start DST earlier than planned. They
1197 # hope to save energy. The new end date is 2013-04-28 00:00 and new
1198 # start date is 2013-09-08 00:00....
1199 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
1201 # From José Miguel Garrido (2014-02-19):
1202 # Today appeared in the Diario Oficial a decree amending the time change
1204 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
1205 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
1206 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
1208 # From Eduardo Romero Urra (2015-03-03):
1209 # Today has been published officially that Chile will use the DST time
1210 # permanently until March 25 of 2017
1211 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
1213 # From Paul Eggert (2015-03-03):
1214 # For now, assume that the extension will persist indefinitely.
1216 # From Juan Correa (2016-03-18):
1217 # The decree regarding DST has been published in today's Official Gazette:
1218 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
1219 # http://www.leychile.cl/Navegar?idNorma=1088502
1220 # It does consider the second Saturday of May and August as the dates
1221 # for the transition; and it lists DST dates until 2019, but I think
1222 # this scheme will stick.
1224 # From Paul Eggert (2016-03-18):
1225 # For now, assume the pattern holds for the indefinite future.
1226 # The decree says transitions occur at 24:00; in practice this appears
1227 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1228 # Island is always two hours behind the mainland.
1230 # From Juan Correa (2016-12-04):
1231 # Magallanes region ... will keep DST (UTC -3) all year round....
1232 # http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-el-decreto-para-establecer-un-horario-unico-para-la-Region-de-Magallanes.aspx
1233 # From Deborah Goldsmith (2017-01-19):
1234 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1236 # From Juan Correa (2018-08-13):
1237 # As of moments ago, the Ministry of Energy in Chile has announced the new
1238 # schema for DST. ... Announcement in video (in Spanish):
1239 # https://twitter.com/MinEnergia/status/1029000399129374720
1240 # From Yonathan Dossow (2018-08-13):
1241 # The video says "first Saturday of September", we all know it means Sunday at
1243 # From Tim Parenti (2018-08-13):
1244 # Translating the captions on the video at 0:44-0:55, "We want to announce as
1245 # Government that from 2019, Winter Time will be increased to 5 months, between
1246 # the first Saturday of April and the first Saturday of September."
1247 # At 2:08-2:20, "The Magallanes region will maintain its current time, as
1248 # decided by the citizens during 2017, but our Government will promote a
1249 # regional dialogue table to gather their opinion on this matter."
1250 # https://twitter.com/MinEnergia/status/1029009354001973248
1251 # "We will keep the new time policy unchanged for at least the next 4 years."
1252 # So we extend the new rules on Saturdays at 24:00 mainland time indefinitely.
1253 # From Juan Correa (2019-02-04):
1254 # http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf
1255 # From Paul Eggert (2019-09-01):
1256 # The above says the Magallanes exception expires 2022-04-02 at 24:00,
1257 # so in theory, they will revert to -04/-03 after that.
1258 # For now, assume that they will not revert,
1259 # since they have extended the expiration date once already.
1261 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1262 Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
1263 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1264 Rule Chile 1968 only - Nov 3 4:00u 1:00 -
1265 Rule Chile 1969 only - Mar 30 3:00u 0 -
1266 Rule Chile 1969 only - Nov 23 4:00u 1:00 -
1267 Rule Chile 1970 only - Mar 29 3:00u 0 -
1268 Rule Chile 1971 only - Mar 14 3:00u 0 -
1269 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 -
1270 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1271 Rule Chile 1973 only - Sep 30 4:00u 1:00 -
1272 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 -
1273 Rule Chile 1987 only - Apr 12 3:00u 0 -
1274 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1275 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 -
1276 Rule Chile 1990 only - Sep 16 4:00u 1:00 -
1277 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1278 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 -
1279 Rule Chile 1997 only - Mar 30 3:00u 0 -
1280 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1281 Rule Chile 1998 only - Sep 27 4:00u 1:00 -
1282 Rule Chile 1999 only - Apr 4 3:00u 0 -
1283 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 -
1284 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1285 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1286 # which is used below in specifying the transition.
1287 Rule Chile 2008 only - Mar 30 3:00u 0 -
1288 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1289 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1290 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1291 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 -
1292 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1293 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 -
1294 Rule Chile 2016 2018 - May Sun>=9 3:00u 0 -
1295 Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 -
1296 Rule Chile 2019 max - Apr Sun>=2 3:00u 0 -
1297 Rule Chile 2019 max - Sep Sun>=2 4:00u 1:00 -
1298 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1299 # (1996-09) says 1998-03-08. Ignore these.
1300 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1301 Zone America/Santiago -4:42:46 - LMT 1890
1302 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1303 -5:00 - -05 1916 Jul 1
1304 -4:42:46 - SMT 1918 Sep 10
1305 -4:00 - -04 1919 Jul 1
1306 -4:42:46 - SMT 1927 Sep 1
1307 -5:00 Chile -05/-04 1932 Sep 1
1308 -4:00 - -04 1942 Jun 1
1309 -5:00 - -05 1942 Aug 1
1310 -4:00 - -04 1946 Jul 15
1311 -4:00 1:00 -03 1946 Sep 1 # central Chile
1312 -4:00 - -04 1947 Apr 1
1313 -5:00 - -05 1947 May 21 23:00
1315 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1316 -4:42:46 - SMT 1910 Jan 10
1317 -5:00 - -05 1916 Jul 1
1318 -4:42:46 - SMT 1918 Sep 10
1319 -4:00 - -04 1919 Jul 1
1320 -4:42:46 - SMT 1927 Sep 1
1321 -5:00 Chile -05/-04 1932 Sep 1
1322 -4:00 - -04 1942 Jun 1
1323 -5:00 - -05 1942 Aug 1
1324 -4:00 - -04 1947 Apr 1
1325 -5:00 - -05 1947 May 21 23:00
1326 -4:00 Chile -04/-03 2016 Dec 4
1328 Zone Pacific/Easter -7:17:28 - LMT 1890
1329 -7:17:28 - EMT 1932 Sep # Easter Mean Time
1330 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time
1333 # Salas y Gómez Island is uninhabited.
1334 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
1335 # and Antarctic bases, are like America/Santiago.
1337 # Antarctic base using South American rules
1338 # (See the file 'antarctica' for more.)
1340 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
1342 # From Ethan Dicks (1996-10-06):
1343 # It keeps the same time as Punta Arenas, Chile, because, just like us
1344 # and the South Pole, that's the other end of their supply line....
1345 # I verified with someone who was there that since 1980,
1346 # Palmer has followed Chile. Prior to that, before the Falklands War,
1347 # Palmer used to be supplied from Argentina.
1349 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1350 Zone Antarctica/Palmer 0 - -00 1965
1351 -4:00 Arg -04/-03 1969 Oct 5
1352 -3:00 Arg -03/-02 1982 May
1353 -4:00 Chile -04/-03 2016 Dec 4
1358 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1359 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1361 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1362 Rule CO 1992 only - May 3 0:00 1:00 -
1363 Rule CO 1993 only - Apr 4 0:00 0 -
1364 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1365 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1366 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1368 # Malpelo, Providencia, San Andres
1369 # no information; probably like America/Bogota
1373 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1375 # From Paul Eggert (2006-03-22):
1376 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1377 # -4:00 since standard time was introduced on 1912-03-02; and that
1378 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1379 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1380 # Saba Island has been like Curaçao.
1381 # This all predates our 1970 cutoff, though.
1383 # By July 2007 Curaçao and St Maarten are planned to become
1384 # associated states within the Netherlands, much like Aruba;
1385 # Bonaire, Saba and St Eustatius would become directly part of the
1386 # Netherlands as Kingdom Islands. This won't affect their time zones
1387 # though, as far as we know.
1389 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1390 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad
1394 # From Arthur David Olson (2011-06-15):
1395 # use links for places with new iso3166 codes.
1396 # The name "Lower Prince's Quarter" is both longer than fourteen characters
1397 # and contains an apostrophe; use "Lower_Princes" below.
1399 Link America/Curacao America/Lower_Princes # Sint Maarten
1400 Link America/Curacao America/Kralendijk # Caribbean Netherlands
1404 # Milne says the Central and South American Telegraph Company used -5:24:15.
1406 # From Alois Treindl (2016-12-15):
1407 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1408 # ... Whether the law applied also to Galápagos, I do not know.
1409 # From Paul Eggert (2016-12-15):
1410 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1411 # This says President Sixto Durán Ballén signed decree No. 285, which
1412 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1413 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1414 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1415 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1416 # sol" ("It was dawning in the middle of the night, the buses went to class
1417 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1418 # (Not one step back), the clocks went back in 1993 and the experiment was not
1419 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1421 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1422 Rule Ecuador 1992 only - Nov 28 0:00 1:00 -
1423 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1425 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1426 Zone America/Guayaquil -5:19:20 - LMT 1890
1427 -5:14:00 - QMT 1931 # Quito Mean Time
1428 -5:00 Ecuador -05/-04
1429 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1431 -6:00 Ecuador -06/-05
1435 # From Paul Eggert (2006-03-22):
1436 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1437 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1439 # From Falkland Islands Government Office, London (2001-01-22)
1440 # via Jesper Nørgaard:
1441 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1442 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1443 # September. It is anticipated that the clocks will revert back at 2
1444 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
1445 # Sunday 1 September.
1447 # From Rives McDow (2001-02-13):
1449 # I have communicated several times with people there, and the last
1450 # time I had communications that was helpful was in 1998. Here is
1451 # what was said then:
1453 # "The general rule was that Stanley used daylight saving and the Camp
1454 # did not. However for various reasons many people in the Camp have
1455 # started to use daylight saving (known locally as 'Stanley Time')
1456 # There is no rule as to who uses daylight saving - it is a matter of
1457 # personal choice and so it is impossible to draw a map showing who
1458 # uses it and who does not. Any list would be out of date as soon as
1459 # it was produced. This year daylight saving ended on April 18/19th
1460 # and started again on September 12/13th. I do not know what the rule
1461 # is, but can find out if you like. We do not change at the same time
1464 # I did have in my notes that the rule was "Second Saturday in Sep at
1465 # 0:00 until third Saturday in Apr at 0:00". I think that this does
1466 # not agree in some cases with Shanks; is this true?
1468 # Also, there is no mention in the list that some areas in the
1469 # Falklands do not use DST. I have found in my communications there
1470 # that these areas are on the western half of East Falkland and all of
1471 # West Falkland. Stanley is the only place that consistently observes
1472 # DST. Again, as in other places in the world, the farmers don't like
1473 # it. West Falkland is almost entirely sheep farmers.
1475 # I know one lady there that keeps a list of which farm keeps DST and
1476 # which doesn't each year. She runs a shop in Stanley, and says that
1477 # the list changes each year. She uses it to communicate to her
1478 # customers, catching them when they are home for lunch or dinner.
1480 # From Paul Eggert (2001-03-05):
1481 # For now, we'll just record the time in Stanley, since we have no
1484 # From Steffen Thorsen (2011-04-01):
1485 # The Falkland Islands will not turn back clocks this winter, but stay on
1486 # daylight saving time.
1489 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
1491 # We have gotten this confirmed by a clerk of the legislative assembly:
1492 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1493 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1494 # hours) on the first Sunday of September at 0200hrs.
1496 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1497 # will not revert to local mean time, but clocks will remain on Summer
1498 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1499 # change to local time following the trial period will be notified.
1501 # From Andrew Newman (2012-02-24)
1502 # A letter from Justin McPhee, Chief Executive,
1503 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1505 # The current Atlantic/Stanley entry under South America expects the
1506 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1507 # The database entry states that in 2011 Stanley was staying on fixed
1508 # summer time on a trial basis only. FIG need to contact IANA and/or
1509 # the maintainers of the database to inform them we're adopting
1510 # the same policy this year and suggest recommendations for future years.
1512 # For now we will assume permanent -03 for the Falklands
1513 # until advised differently (to apply for 2012 and beyond, after the 2011
1514 # experiment was apparently successful.)
1515 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1516 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 -
1517 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1518 Rule Falk 1939 only - Oct 1 0:00 1:00 -
1519 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 -
1520 Rule Falk 1943 only - Jan 1 0:00 0 -
1521 Rule Falk 1983 only - Sep lastSun 0:00 1:00 -
1522 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1523 Rule Falk 1984 only - Sep 16 0:00 1:00 -
1524 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 -
1525 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1526 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1527 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 -
1528 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1529 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1530 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1531 -4:00 Falk -04/-03 1983 May
1532 -3:00 Falk -03/-02 1985 Sep 15
1533 -4:00 Falk -04/-03 2010 Sep 5 2:00
1537 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1538 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1539 -4:00 - -04 1967 Oct
1543 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1544 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1545 -3:45 - -0345 1975 Jul 31
1547 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1552 # From Paul Eggert (2006-03-22):
1553 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1554 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1555 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1557 # From Waldemar Villamayor-Venialbo (2013-09-20):
1558 # No time of the day is established for the adjustment, so people normally
1559 # adjust their clocks at 0 hour of the given dates.
1561 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1562 Rule Para 1975 1988 - Oct 1 0:00 1:00 -
1563 Rule Para 1975 1978 - Mar 1 0:00 0 -
1564 Rule Para 1979 1991 - Apr 1 0:00 0 -
1565 Rule Para 1989 only - Oct 22 0:00 1:00 -
1566 Rule Para 1990 only - Oct 1 0:00 1:00 -
1567 Rule Para 1991 only - Oct 6 0:00 1:00 -
1568 Rule Para 1992 only - Mar 1 0:00 0 -
1569 Rule Para 1992 only - Oct 5 0:00 1:00 -
1570 Rule Para 1993 only - Mar 31 0:00 0 -
1571 Rule Para 1993 1995 - Oct 1 0:00 1:00 -
1572 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1573 Rule Para 1996 only - Mar 1 0:00 0 -
1574 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1575 # From Steffen Thorsen (2000-10-02):
1576 # I have three independent reports that Paraguay changed to DST this Sunday
1579 # Translated by Gwillim Law (2001-02-27) from
1580 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1581 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1582 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1583 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1584 # system has been operating for several years. Formerly there was a separate
1585 # decree each year; the new law has the same effect, but permanently. Every
1586 # year, the time will change on the first Sunday of October; likewise, the
1587 # clock will be set back on the first Sunday of March.
1589 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 -
1590 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1591 Rule Para 1997 only - Feb lastSun 0:00 0 -
1592 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1593 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1594 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1595 # From Rives McDow (2002-02-28):
1596 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1597 # dst method to be from the first Sunday in September to the first Sunday in
1599 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1600 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 -
1602 # From Jesper Nørgaard Welen (2005-01-02):
1603 # There are several sources that claim that Paraguay made
1604 # a timezone rule change in autumn 2004.
1605 # From Steffen Thorsen (2005-01-05):
1606 # Decree 1,867 (2004-03-05)
1607 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1608 # http://www.presidencia.gov.py/decretos/D1867.pdf
1609 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 -
1610 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1611 # From Carlos Raúl Perasso (2010-02-18):
1612 # By decree number 3958 issued yesterday
1613 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1614 # Paraguay changes its DST schedule, postponing the March rule to April and
1615 # modifying the October date. The decree reads:
1617 # Art. 1. It is hereby established that from the second Sunday of the month of
1618 # April of this year (2010), the official time is to be set back 60 minutes,
1619 # and that on the first Sunday of the month of October, it is to be set
1620 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1622 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 -
1623 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1625 # From Steffen Thorsen (2013-03-07):
1626 # Paraguay will end DST on 2013-03-24 00:00....
1627 # http://www.ande.gov.py/interna.php?id=1075
1629 # From Carlos Raúl Perasso (2013-03-15):
1630 # The change in Paraguay is now final. Decree number 10780
1631 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1632 # From Carlos Raúl Perasso (2014-02-28):
1633 # Decree 1264 can be found at:
1634 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1635 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1637 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1638 Zone America/Asuncion -3:50:40 - LMT 1890
1639 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1640 -4:00 - -04 1972 Oct
1641 -3:00 - -03 1974 Apr
1646 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1647 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1648 # When we were in Peru in 1985-1986, they apparently switched over
1649 # sometime between December 29 and January 3 while we were on the Amazon.
1651 # From Paul Eggert (2006-03-22):
1652 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1654 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1655 Rule Peru 1938 only - Jan 1 0:00 1:00 -
1656 Rule Peru 1938 only - Apr 1 0:00 0 -
1657 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 -
1658 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1659 Rule Peru 1986 1987 - Jan 1 0:00 1:00 -
1660 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1661 Rule Peru 1990 only - Jan 1 0:00 1:00 -
1662 Rule Peru 1990 only - Apr 1 0:00 0 -
1663 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1664 Rule Peru 1994 only - Jan 1 0:00 1:00 -
1665 Rule Peru 1994 only - Apr 1 0:00 0 -
1666 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1667 Zone America/Lima -5:08:12 - LMT 1890
1668 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1672 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1673 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1677 # uninhabited; scientific personnel have wintered
1680 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1681 Zone America/Paramaribo -3:40:40 - LMT 1911
1682 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1683 -3:40:36 - PMT 1945 Oct # The capital moved?
1684 -3:30 - -0330 1984 Oct
1687 # Trinidad and Tobago
1688 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1689 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
1692 # These all agree with Trinidad and Tobago since 1970.
1693 Link America/Port_of_Spain America/Anguilla
1694 Link America/Port_of_Spain America/Antigua
1695 Link America/Port_of_Spain America/Dominica
1696 Link America/Port_of_Spain America/Grenada
1697 Link America/Port_of_Spain America/Guadeloupe
1698 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1699 Link America/Port_of_Spain America/Montserrat
1700 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1701 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1702 Link America/Port_of_Spain America/St_Lucia
1703 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1704 Link America/Port_of_Spain America/St_Vincent
1705 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1708 # From Paul Eggert (1993-11-18):
1709 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1711 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael
1712 # Deckers (2018-02-20):
1713 # ... At least they kept good records...
1715 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36
1716 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and
1717 # Meteorology Service of the Uruguayan Navy, seems to give many transitions
1718 # with greater clarity than we've had before. It directly references many laws
1719 # and decrees which are, in turn, referenced below. They can be viewed in the
1720 # public archives of the Diario Oficial (in Spanish) at
1721 # http://www.impo.com.uy/diariooficial/
1723 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the
1724 # auspices of the National Institute for the Prediction of Time. It is unclear
1725 # exactly what offset was used during this period, though Ley No. 7200 of
1726 # 1920-04-23 used the Observatory of the National Meteorological Institute in
1727 # Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian,
1728 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00,
1729 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on
1730 # page 725 of the Proceedings of the Second Pan-American Scientific Congress,
1731 # 1915-1916) was in use, and merely became official from 1908-06-10.
1732 # https://www.impo.com.uy/diariooficial/1908/06/18/12
1733 # https://www.impo.com.uy/diariooficial/1920/04/27/9
1735 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced
1736 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14
1737 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the
1738 # National Council of Administration the same day, published directly below the
1739 # law in the Diario Oficial, specified the first transition to be 1923-09-30
1740 # 24:00. This effectively established standard time at UT-03:30 with 30
1741 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No.
1742 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other
1743 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolución
1744 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it
1745 # would have been under the previous law.
1746 # https://www.impo.com.uy/diariooficial/1923/07/02/2
1747 # https://www.impo.com.uy/diariooficial/1926/03/10/2
1748 # https://www.impo.com.uy/diariooficial/1926/03/18/2
1750 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1751 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 -
1752 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1753 # From Tim Parenti (2018-02-15):
1754 # http://www.impo.com.uy/diariooficial/1933/10/27/6
1756 # It appears Ley No. 9122 of 1933 was never published as such in the Diario
1757 # Oficial, but instead appeared as Document 26 in the Diario on Friday
1758 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of
1759 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the
1760 # last Sunday of October...until the last Saturday of March." In accordance
1761 # with this provision, the first transition was explicitly specified in Article
1762 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29
1763 # at 00:00. Assume transitions at 00:00 Sunday throughout.
1765 # Departing from the matter-of-fact nature of previous timekeeping laws, the
1766 # 1933 decree "consider[s] the advantages of...the advance of legal time":
1768 # "Whereas: The measure adopted by almost all nations at the time of the last
1769 # World War still persists in North America and Europe, precisely because of
1770 # the economic, hygienic, and social advantages derived from such an
1771 # emergency measure...
1773 # Whereas: The advance of the legal time during the summer seasons, by
1774 # displacing social activity near sunrise, favors the citizen populations
1775 # and especially the society that creates and works..."
1777 # It further specified that "necessary measures" be taken to ensure that
1778 # "public spectacles finish, in general, before [01:00]."
1779 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 -
1780 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 -
1781 # From Tim Parenti (2018-02-15):
1782 # Most of the Rules below, and their contemporaneous Zone lines, have been
1783 # updated simply to match the Almanaque 2018. Although the document does not
1784 # list exact transition times, midnight transitions were already present in our
1785 # data here for all transitions through 2004-09, and this is both consistent
1786 # with prior transitions and verified in several decrees marked below between
1787 # 1939-09 and 2004-09, wherein the relevant text was typically of the form:
1789 # "From 0 hours on [date], the legal time of the entire Republic will be...
1791 # In accordance with [the preceding], on [previous date] at 24 hours, all
1792 # clocks throughout the Republic will be [advanced/retarded] by..."
1794 # It is possible that there is greater specificity to be found for the Rules
1795 # below, but it is buried in no fewer than 40 different decrees individually
1796 # referenced by the Almanaque for the period from 1939-09 to 2014-09.
1797 # Four-fifths of these were promulgated less than two weeks before taking
1798 # effect; more than half within a week and none more than 5 weeks. Only the
1799 # handful with comments below have been checked with any thoroughness.
1800 Rule Uruguay 1939 only - Oct 1 0:00 0:30 -
1801 Rule Uruguay 1940 only - Oct 27 0:00 0:30 -
1802 # From Tim Parenti (2018-02-15):
1803 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified
1804 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel".
1805 # http://www.impo.com.uy/diariooficial/1941/08/04/1
1806 Rule Uruguay 1941 only - Aug 1 0:00 0:30 -
1807 # From Tim Parenti (2018-02-15):
1808 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified
1809 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks
1810 # never went back to UT-03:30 thereafter, this is modeled as advancing standard
1811 # time by 30 minutes to UT-03, while retaining 30 minutes of DST.
1812 # http://www.impo.com.uy/diariooficial/1942/12/16/3
1813 Rule Uruguay 1942 only - Dec 14 0:00 0:30 -
1814 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1815 Rule Uruguay 1959 only - May 24 0:00 0:30 -
1816 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1817 Rule Uruguay 1960 only - Jan 17 0:00 1:00 -
1818 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1819 Rule Uruguay 1965 only - Apr 4 0:00 1:00 -
1820 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1821 # From Tim Parenti (2018-02-15):
1822 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the
1823 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00.
1824 # http://www.impo.com.uy/diariooficial/1968/05/30/5
1825 Rule Uruguay 1968 only - May 27 0:00 0:30 -
1826 Rule Uruguay 1968 only - Dec 1 0:00 0 -
1827 # From Tim Parenti (2018-02-15):
1828 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity
1829 # consumption "as a consequence of the current rainfall regime in the country".
1830 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00.
1831 # http://www.impo.com.uy/diariooficial/1970/04/29/4
1832 Rule Uruguay 1970 only - Apr 25 0:00 1:00 -
1833 Rule Uruguay 1970 only - Jun 14 0:00 0 -
1834 Rule Uruguay 1972 only - Apr 23 0:00 1:00 -
1835 Rule Uruguay 1972 only - Jul 16 0:00 0 -
1836 # From Tim Parenti (2018-02-15):
1837 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of
1838 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of
1839 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30
1840 # minutes followed in Decreto 679/974 of 1974-08-29.
1841 # http://www.impo.com.uy/diariooficial/1974/01/22/11
1842 # http://www.impo.com.uy/diariooficial/1974/03/14/3
1843 # http://www.impo.com.uy/diariooficial/1974/09/04/6
1844 Rule Uruguay 1974 only - Jan 13 0:00 1:30 -
1845 Rule Uruguay 1974 only - Mar 10 0:00 0:30 -
1846 Rule Uruguay 1974 only - Sep 1 0:00 0 -
1847 Rule Uruguay 1974 only - Dec 22 0:00 1:00 -
1848 Rule Uruguay 1975 only - Mar 30 0:00 0 -
1849 Rule Uruguay 1976 only - Dec 19 0:00 1:00 -
1850 Rule Uruguay 1977 only - Mar 6 0:00 0 -
1851 Rule Uruguay 1977 only - Dec 4 0:00 1:00 -
1852 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 -
1853 Rule Uruguay 1978 only - Dec 17 0:00 1:00 -
1854 Rule Uruguay 1979 only - Apr 29 0:00 1:00 -
1855 Rule Uruguay 1980 only - Mar 16 0:00 0 -
1856 # From Tim Parenti (2018-02-15):
1857 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist
1858 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00.
1859 # http://www.impo.com.uy/diariooficial/1988/01/25/1
1860 Rule Uruguay 1987 only - Dec 14 0:00 1:00 -
1861 Rule Uruguay 1988 only - Feb 28 0:00 0 -
1862 Rule Uruguay 1988 only - Dec 11 0:00 1:00 -
1863 Rule Uruguay 1989 only - Mar 5 0:00 0 -
1864 Rule Uruguay 1989 only - Oct 29 0:00 1:00 -
1865 Rule Uruguay 1990 only - Feb 25 0:00 0 -
1866 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04):
1867 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the
1868 # 1992/1993 season appears to be the first in over half a century where DST
1869 # both began and ended pursuant to the same decree.
1870 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 -
1871 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 -
1872 Rule Uruguay 1992 only - Oct 18 0:00 1:00 -
1873 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1874 # From Eduardo Cota (2004-09-20):
1875 # The Uruguayan government has decreed a change in the local time....
1876 # From Tim Parenti (2018-02-15):
1877 # Decreto 328/004 of 2004-09-15.
1878 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1
1879 Rule Uruguay 2004 only - Sep 19 0:00 1:00 -
1880 # From Steffen Thorsen (2005-03-11):
1881 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1882 # save energy ... it was postponed two weeks....
1883 # From Tim Parenti (2018-02-15):
1884 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous
1885 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending
1887 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1
1888 # The original decree specified a transition of 2005-03-12 24:00, but the new
1889 # one specified 2005-03-27 02:00.
1890 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1891 # From Eduardo Cota (2005-09-27):
1892 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time,
1893 # official time in Uruguay will be at GMT -2.
1894 # From Tim Parenti (2018-02-15):
1895 # Decreto 318/005 of 2005-09-19.
1896 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1
1897 Rule Uruguay 2005 only - Oct 9 2:00 1:00 -
1898 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 -
1899 # From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06):
1900 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday
1901 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque
1902 # 2018 appears to have a few typoed dates through this period; ignore them.
1903 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1
1904 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 -
1905 # From Steffen Thorsen (2015-06-30):
1906 # ... it looks like they will not be using DST the coming summer:
1907 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1908 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1909 # From Paul Eggert (2015-06-30):
1910 # Apparently restaurateurs complained that DST caused people to go to the beach
1911 # instead of out to dinner.
1912 # From Pablo Camargo (2015-07-13):
1913 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1914 # From Tim Parenti (2018-02-15):
1915 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.
1917 # This Zone can be simplified once we assume zic %z.
1918 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10
1919 -3:44:51 - MMT 1920 May 1 # Montevideo MT
1920 -4:00 - -04 1923 Oct 1
1921 -3:30 Uruguay -0330/-03 1942 Dec 14
1922 -3:00 Uruguay -03/-0230 1960
1923 -3:00 Uruguay -03/-02 1968
1924 -3:00 Uruguay -03/-0230 1970
1925 -3:00 Uruguay -03/-02 1974
1926 -3:00 Uruguay -03/-0130 1974 Mar 10
1927 -3:00 Uruguay -03/-0230 1974 Dec 22
1928 -3:00 Uruguay -03/-02
1932 # From Paul Eggert (2015-07-28):
1933 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1934 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1936 # From John Stainforth (2007-11-28):
1937 # ... the change for Venezuela originally expected for 2007-12-31 has
1938 # been brought forward to 2007-12-09. The official announcement was
1939 # published today in the "Gaceta Oficial de la República Bolivariana
1940 # de Venezuela, número 38.819" (official document for all laws or
1941 # resolution publication)
1942 # http://www.globovision.com/news.php?nid=72208
1944 # From Alexander Krivenyshev (2016-04-15):
1945 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1947 # From Paul Eggert (2016-04-15):
1948 # Clocks advance 30 minutes on 2016-05-01 at 02:30....
1949 # "'Venezuela's new time-zone: hours without light, hours without water,
1950 # hours of presidential broadcasts, hours of lines,' quipped comedian
1951 # Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps
1952 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400
1953 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE
1955 # From Matt Johnson (2016-04-20):
1956 # ... published in the official Gazette [2016-04-18], here:
1957 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf
1959 # Zone NAME STDOFF RULES FORMAT [UNTIL]
1960 Zone America/Caracas -4:27:44 - LMT 1890
1961 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
1962 -4:30 - -0430 1965 Jan 1 0:00
1963 -4:00 - -04 2007 Dec 9 3:00
1964 -4:30 - -0430 2016 May 1 2:30
projects / dragonfly.git / blob