30 # invented and did not reflect common practice.
31
32 ###############################################################################
33
34 ###############################################################################
35
36 # Argentina
37
38 # From Bob Devine (1988-01-28):
39 # Argentina: first Sunday in October to first Sunday in April since 1976.
40 # Double Summer time from 1969 to 1974. Switches at midnight.
41
42 # From U. S. Naval Observatory (1988-01-19):
43 # ARGENTINA 3 H BEHIND UTC
44
45 # From Hernan G. Otero (1995-06-26):
46 # I am sending modifications to the Argentine time zone table...
47 # AR was chosen because they are the ISO letters that represent Argentina.
48
49 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
50 Rule Arg 1930 only - Dec 1 0:00 1:00 S
51 Rule Arg 1931 only - Apr 1 0:00 0 -
52 Rule Arg 1931 only - Oct 15 0:00 1:00 S
53 Rule Arg 1932 1940 - Mar 1 0:00 0 -
54 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
55 Rule Arg 1940 only - Jul 1 0:00 1:00 S
56 Rule Arg 1941 only - Jun 15 0:00 0 -
57 Rule Arg 1941 only - Oct 15 0:00 1:00 S
58 Rule Arg 1943 only - Aug 1 0:00 0 -
59 Rule Arg 1943 only - Oct 15 0:00 1:00 S
60 Rule Arg 1946 only - Mar 1 0:00 0 -
61 Rule Arg 1946 only - Oct 1 0:00 1:00 S
62 Rule Arg 1963 only - Oct 1 0:00 0 -
63 Rule Arg 1963 only - Dec 15 0:00 1:00 S
64 Rule Arg 1964 1966 - Mar 1 0:00 0 -
65 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
66 Rule Arg 1967 only - Apr 2 0:00 0 -
67 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
68 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
69 Rule Arg 1974 only - Jan 23 0:00 1:00 S
70 Rule Arg 1974 only - May 1 0:00 0 -
71 Rule Arg 1988 only - Dec 1 0:00 1:00 S
72 #
73 # From Hernan G. Otero (1995-06-26):
74 # These corrections were contributed by InterSoft Argentina S.A.,
75 # obtaining the data from the:
76 # Talleres de Hidrografía Naval Argentina
77 # (Argentine Naval Hydrography Institute)
78 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
79 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
80 #
81 # From Hernan G. Otero (1995-06-26):
82 # From this moment on, the law that mandated the daylight saving
83 # time corrections was derogated and no more modifications
84 # to the time zones (for daylight saving) are now made.
85 #
86 # From Rives McDow (2000-01-10):
87 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
88 # which did not result in the switch of a time zone, as they stayed 9 hours
89 # from the International Date Line.
90 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
91 # From Paul Eggert (2007-12-28):
92 # DST was set to expire on March 5, not March 3, but since it was converted
93 # to standard time on March 3 it's more convenient for us to pretend that
94 # it ended on March 3.
95 Rule Arg 2000 only - Mar 3 0:00 0 -
96 #
97 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
98 # We just checked with our São Paulo office and they say the government of
99 # Argentina decided not to become one of the countries that go on or off DST.
100 # So Buenos Aires should be -3 hours from GMT at all times.
101 #
102 # From Fabián L. Arce Jofré (2000-04-04):
103 # The law that claimed DST for Argentina was derogated by President Fernando
104 # de la Rúa on March 2, 2000, because it would make people spend more energy
105 # in the winter time, rather than less. The change took effect on March 3.
106 #
107 # From Mariano Absatz (2001-06-06):
108 # one of the major newspapers here in Argentina said that the 1999
109 # Timezone Law (which never was effectively applied) will (would?) be
110 # in effect.... The article is at
173 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
174 #
175 # Press release 235 dated Saturday October 18th, from the Government of the
176 # Province of Jujuy saying it will not apply DST either (even when it was not
177 # included in Decree 1705/2008).
178 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
179
180 # From fullinet (2009-10-18):
181 # As announced in
182 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
183 # (an official .gob.ar) under title: "Sin Cambio de Hora"
184 # (English: "No hour change").
185 #
186 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
187 # oficial, decisión que estaba en estudio para su implementación el
188 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
189 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
190 # la modificación del huso horario, ya que 2009 nos encuentra con
191 # crecimiento en la producción y distribución energética."
192
193 Rule Arg 2007 only - Dec 30 0:00 1:00 S
194 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
195 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
196
197 # From Mariano Absatz (2004-05-21):
198 # Today it was officially published that the Province of Mendoza is changing
199 # its timezone this winter... starting tomorrow night....
200 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
201 # From Paul Eggert (2004-05-24):
202 # It's Law No. 7,210. This change is due to a public power emergency, so for
203 # now we'll assume it's for this year only.
204 #
205 # From Paul Eggert (2014-08-09):
206 # Hora de verano para la República Argentina
207 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
208 # says that standard time in Argentina from 1894-10-31
209 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
210 # over Shanks & Pottenger.
211 #
212 # From Mariano Absatz (2004-06-05):
213 # These media articles from a major newspaper mostly cover the current state:
214 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
215 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
216 #
217 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
218 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
219 # Apparently, all nine provinces would go back to UTC-03:00 at the same
220 # time in October 17th.
221 #
222 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
223 # Tierra del Fuego, Tucumán.
224 #
225 # From Mariano Absatz (2004-06-14):
226 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
227 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
228 # annoyance with the change is much higher than the power savings obtained....
229 #
230 # From Gwillim Law (2004-06-14):
364 # America/Argentina/San_Luis entries should change to use these...
365 # ...
366
367 # From Alexander Krivenyshev (2010-04-09):
368 # According to news reports from El Diario de la República Province San
369 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
370 # after April 11, 2010 - will continue to have same time as rest of
371 # Argentina (UTC-3) (no DST).
372 #
373 # Confirmaron la prórroga del huso horario de verano (Spanish)
374 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
375 # or (some English translation):
376 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
377
378 # From Mariano Absatz (2010-04-12):
379 # yes...I can confirm this...and given that San Luis keeps calling
380 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
381 # rules...San Luis is still using "Western ARgentina Time" and it got
382 # stuck on Summer daylight savings time even though the summer is over.
383
384 # From Paul Eggert (2013-09-05):
385 # Perhaps San Luis operates on the legal fiction that it is at -04
386 # with perpetual summer time, but ordinary usage typically seems to
387 # just say it's at -03; see, for example,
388 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
389 # We've documented similar situations as being plain changes to
390 # standard time, so let's do that here too. This does not change UTC
391 # offsets, only tm_isdst and the time zone abbreviations. One minor
392 # plus is that this silences a zic complaint that there's no POSIX TZ
393 # setting for time stamps past 2038.
394
395 # From Paul Eggert (2013-02-21):
396 # Milne says Córdoba time was -4:16:48.2. Round to the nearest second.
397
398 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
399 #
400 # Buenos Aires (BA), Capital Federal (CF),
401 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
402 -4:16:48 - CMT 1920 May # Córdoba Mean Time
403 -4:00 - -04 1930 Dec
404 -4:00 Arg -04/-03 1969 Oct 5
405 -3:00 Arg -03/-02 1999 Oct 3
406 -4:00 Arg -04/-03 2000 Mar 3
407 -3:00 Arg -03/-02
408 #
409 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
410 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
411 #
412 # Shanks & Pottenger also make the following claims, which we haven't verified:
413 # - Formosa switched to -3:00 on 1991-01-07.
414 # - Misiones switched to -3:00 on 1990-12-29.
415 # - Chaco switched to -3:00 on 1991-01-04.
416 # - Santiago del Estero switched to -4:00 on 1991-04-01,
417 # then to -3:00 on 1991-04-26.
512 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
513 -4:16:48 - CMT 1920 May
514 -4:00 - -04 1930 Dec
515 -4:00 Arg -04/-03 1969 Oct 5
516 -3:00 Arg -03/-02 1990 Mar 4
517 -4:00 - -04 1990 Oct 15
518 -4:00 1:00 -03 1991 Mar 1
519 -4:00 - -04 1991 Oct 15
520 -4:00 1:00 -03 1992 Mar 1
521 -4:00 - -04 1992 Oct 18
522 -3:00 Arg -03/-02 1999 Oct 3
523 -4:00 Arg -04/-03 2000 Mar 3
524 -3:00 - -03 2004 May 23
525 -4:00 - -04 2004 Sep 26
526 -3:00 Arg -03/-02 2008 Oct 18
527 -3:00 - -03
528 #
529 # San Luis (SL)
530
531 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
532 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 S
533
534 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
535 -4:16:48 - CMT 1920 May
536 -4:00 - -04 1930 Dec
537 -4:00 Arg -04/-03 1969 Oct 5
538 -3:00 Arg -03/-02 1990
539 -3:00 1:00 -02 1990 Mar 14
540 -4:00 - -04 1990 Oct 15
541 -4:00 1:00 -03 1991 Mar 1
542 -4:00 - -04 1991 Jun 1
543 -3:00 - -03 1999 Oct 3
544 -4:00 1:00 -03 2000 Mar 3
545 -3:00 - -03 2004 May 31
546 -4:00 - -04 2004 Jul 25
547 -3:00 Arg -03/-02 2008 Jan 21
548 -4:00 SanLuis -04/-03 2009 Oct 11
549 -3:00 - -03
550 #
551 # Santa Cruz (SC)
552 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
754 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
755
756 # From Steffen Thorsen (2013-09-20):
757 # Tocantins in Brazil is very likely not to observe DST from October....
758 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
759 # We will keep this article updated when this is confirmed:
760 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
761
762 # From Steffen Thorsen (2013-10-17):
763 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
764 # Senator Jorge Viana announced that Acre will change time zone on November 10.
765 # He did not specify the time of the change, nor if western parts of Amazonas
766 # will change as well.
767 #
768 # From Paul Eggert (2013-10-17):
769 # For now, assume western Amazonas will change as well.
770
771 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
772 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
773 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
774 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
775 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
776 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
777 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
778 # revoked DST.
779 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
780 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
781 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
782 Rule Brazil 1950 only - Apr 16 1:00 0 -
783 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
784 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
785 Rule Brazil 1953 only - Mar 1 0:00 0 -
786 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
787 # revoked DST.
788 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
789 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
790 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
791 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
792 # extended the above decree to all of the national territory on 12-09.
793 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
794 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
795 # extended summer time by one day to 1964-03-01 00:00 (start of school).
796 Rule Brazil 1964 only - Mar 1 0:00 0 -
797 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
798 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
799 Rule Brazil 1965 only - Mar 31 0:00 0 -
800 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
801 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
802 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
803 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
804 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
805 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
806 # revoked DST.
807 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
808 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
809 # Decree 92,310 (1986-01-21)
810 # Decree 92,463 (1986-03-13)
811 Rule Brazil 1986 only - Mar 15 0:00 0 -
812 # Decree 93,316 (1986-10-01)
813 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
814 Rule Brazil 1987 only - Feb 14 0:00 0 -
815 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
816 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
817 Rule Brazil 1988 only - Feb 7 0:00 0 -
818 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
819 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
820 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
821 Rule Brazil 1989 only - Jan 29 0:00 0 -
822 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
823 # with the same exceptions
824 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
825 Rule Brazil 1990 only - Feb 11 0:00 0 -
826 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
827 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
828 # Decree 99,629 (1990-10-19) adds BA, MT.
829 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
830 Rule Brazil 1991 only - Feb 17 0:00 0 -
831 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
832 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
833 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
834 Rule Brazil 1992 only - Feb 9 0:00 0 -
835 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
836 # adopted by same states.
837 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
838 Rule Brazil 1993 only - Jan 31 0:00 0 -
839 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
840 # adopted by same states, plus AM.
841 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
842 # web page corrected 2004-01-07) adopted by same states, minus AM.
843 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
844 # adopted by same states, plus MT and TO.
845 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
846 # adds AL, SE.
847 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
848 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
849 Rule Brazil 1996 only - Feb 11 0:00 0 -
850 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
851 # adopted by same states, minus AL, SE.
852 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
853 Rule Brazil 1997 only - Feb 16 0:00 0 -
854 # From Daniel C. Sobral (1998-02-12):
855 # In 1997, the DS began on October 6. The stated reason was that
856 # because international television networks ignored Brazil's policy on DS,
857 # they bought the wrong times on satellite for coverage of Pope's visit.
858 # This year, the ending date of DS was postponed to March 1
859 # to help dealing with the shortages of electric power.
860 #
861 # Decree 2,317 (1997-09-04), adopted by same states.
862 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
863 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
864 # (1998-02-10)
865 Rule Brazil 1998 only - Mar 1 0:00 0 -
866 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
867 # adopted by the same states as before.
868 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
869 Rule Brazil 1999 only - Feb 21 0:00 0 -
870 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
871 # (1999-08-23) adopted by same states.
872 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
873 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
874 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
875 Rule Brazil 2000 only - Feb 27 0:00 0 -
876 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
877 # adopted by the same states as before.
878 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
879 # repeals DST in PE and RR, effective 2000-10-15 00:00.
880 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
881 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
882 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
883 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
884 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
885 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
886 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
887 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
888 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
889 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
890 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
891 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
892 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
893 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
894 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
895 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
896 # adopted by the same states as before.
897 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
898 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
899 # adopted by the same states as before.
900 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
901 Rule Brazil 2007 only - Feb 25 0:00 0 -
902 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
903 # adopted by the same states as before.
904 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
905 # From Frederico A. C. Neves (2008-09-10):
906 # According to this decree
907 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
908 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
909 # 3rd Feb Sunday. There is an exception on the return date when this is
910 # the Carnival Sunday then the return date will be the next Sunday...
911 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
912 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
913 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
914 # added Bahia.
915 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
916 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
917 # removed Bahia and added Tocantins.
918 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
919 # removed Tocantins.
920 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
921 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
922 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
923 # From Steffen Thorsen (2017-12-18):
924 # According to many media sources, next year's DST start in Brazil will move to
925 # the first Sunday of November, and it will stay like that for the years after.
926 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
927 # From Steffen Thorsen (2017-12-20):
928 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
929 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
930 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
931 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
932 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
933 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
934 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
935 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
936 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
937 # From Arthur David Olson (2008-09-29):
938 # The next is wrong in some years but is better than nothing.
939 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
940
941 # The latest ruleset listed above says that the following states observe DST:
942 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
943
944 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
945 #
946 # Fernando de Noronha (administratively part of PE)
947 Zone America/Noronha -2:09:40 - LMT 1914
948 -2:00 Brazil -02/-01 1990 Sep 17
949 -2:00 - -02 1999 Sep 30
1216 #
1217 # From Paul Eggert (2016-03-18):
1218 # For now, assume the pattern holds for the indefinite future.
1219 # The decree says transitions occur at 24:00; in practice this appears
1220 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1221 # Island is always two hours behind the mainland.
1222
1223 # From Juan Correa (2016-12-04):
1224 # Magallanes region ... will keep DST (UTC -3) all year round....
1225 # 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
1226 #
1227 # From Deborah Goldsmith (2017-01-19):
1228 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1229 # From Paul Eggert (2017-01-19):
1230 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1231 # so in theory, they will revert to -04/-03 after that, which means
1232 # they will switch from -03 to -04 one hour after Santiago does that day.
1233 # For now, assume that they will not revert.
1234
1235 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1236 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
1237 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1238 Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1239 Rule Chile 1969 only - Mar 30 3:00u 0 -
1240 Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1241 Rule Chile 1970 only - Mar 29 3:00u 0 -
1242 Rule Chile 1971 only - Mar 14 3:00u 0 -
1243 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1244 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1245 Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1246 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1247 Rule Chile 1987 only - Apr 12 3:00u 0 -
1248 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1249 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
1250 Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1251 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1252 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1253 Rule Chile 1997 only - Mar 30 3:00u 0 -
1254 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1255 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1256 Rule Chile 1999 only - Apr 4 3:00u 0 -
1257 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 S
1258 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1259 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1260 # which is used below in specifying the transition.
1261 Rule Chile 2008 only - Mar 30 3:00u 0 -
1262 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1263 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1264 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1265 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 S
1266 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1267 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
1268 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1269 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S
1270 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1271 # (1996-09) says 1998-03-08. Ignore these.
1272 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1273 Zone America/Santiago -4:42:46 - LMT 1890
1274 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1275 -5:00 - -05 1916 Jul 1
1276 -4:42:46 - SMT 1918 Sep 10
1277 -4:00 - -04 1919 Jul 1
1278 -4:42:46 - SMT 1927 Sep 1
1279 -5:00 Chile -05/-04 1932 Sep 1
1280 -4:00 - -04 1942 Jun 1
1281 -5:00 - -05 1942 Aug 1
1282 -4:00 - -04 1946 Jul 15
1283 -4:00 1:00 -03 1946 Sep 1 # central Chile
1284 -4:00 - -04 1947 Apr 1
1285 -5:00 - -05 1947 May 21 23:00
1286 -4:00 Chile -04/-03
1287 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1288 -4:42:46 - SMT 1910 Jan 10
1289 -5:00 - -05 1916 Jul 1
1314 # From Ethan Dicks (1996-10-06):
1315 # It keeps the same time as Punta Arenas, Chile, because, just like us
1316 # and the South Pole, that's the other end of their supply line....
1317 # I verified with someone who was there that since 1980,
1318 # Palmer has followed Chile. Prior to that, before the Falklands War,
1319 # Palmer used to be supplied from Argentina.
1320 #
1321 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1322 Zone Antarctica/Palmer 0 - -00 1965
1323 -4:00 Arg -04/-03 1969 Oct 5
1324 -3:00 Arg -03/-02 1982 May
1325 -4:00 Chile -04/-03 2016 Dec 4
1326 -3:00 - -03
1327
1328 # Colombia
1329
1330 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1331 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1332
1333 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1334 Rule CO 1992 only - May 3 0:00 1:00 S
1335 Rule CO 1993 only - Apr 4 0:00 0 -
1336 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1337 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1338 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1339 -5:00 CO -05/-04
1340 # Malpelo, Providencia, San Andres
1341 # no information; probably like America/Bogota
1342
1343 # Curaçao
1344
1345 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1346 #
1347 # From Paul Eggert (2006-03-22):
1348 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1349 # -4:00 since standard time was introduced on 1912-03-02; and that
1350 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1351 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1352 # Saba Island has been like Curaçao.
1353 # This all predates our 1970 cutoff, though.
1354 #
1374 # Ecuador
1375 #
1376 # Milne says the Central and South American Telegraph Company used -5:24:15.
1377 #
1378 # From Alois Treindl (2016-12-15):
1379 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1380 # ... Whether the law applied also to Galápagos, I do not know.
1381 # From Paul Eggert (2016-12-15):
1382 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1383 # This says President Sixto Durán Ballén signed decree No. 285, which
1384 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1385 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1386 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1387 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1388 # sol" ("It was dawning in the middle of the night, the buses went to class
1389 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1390 # (Not one step back), the clocks went back in 1993 and the experiment was not
1391 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1392 #
1393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1394 Rule Ecuador 1992 only - Nov 28 0:00 1:00 S
1395 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1396 #
1397 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1398 Zone America/Guayaquil -5:19:20 - LMT 1890
1399 -5:14:00 - QMT 1931 # Quito Mean Time
1400 -5:00 Ecuador -05/-04
1401 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1402 -5:00 - -05 1986
1403 -6:00 Ecuador -06/-05
1404
1405 # Falklands
1406
1407 # From Paul Eggert (2006-03-22):
1408 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1409 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1410
1411 # From Falkland Islands Government Office, London (2001-01-22)
1412 # via Jesper Nørgaard:
1413 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1414 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1464 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1465 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1466 # hours) on the first Sunday of September at 0200hrs.
1467 #
1468 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1469 # will not revert to local mean time, but clocks will remain on Summer
1470 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1471 # change to local time following the trial period will be notified.
1472 #
1473 # From Andrew Newman (2012-02-24)
1474 # A letter from Justin McPhee, Chief Executive,
1475 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1476 # states...
1477 # The current Atlantic/Stanley entry under South America expects the
1478 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1479 # The database entry states that in 2011 Stanley was staying on fixed
1480 # summer time on a trial basis only. FIG need to contact IANA and/or
1481 # the maintainers of the database to inform them we're adopting
1482 # the same policy this year and suggest recommendations for future years.
1483 #
1484 # For now we will assume permanent summer time for the Falklands
1485 # until advised differently (to apply for 2012 and beyond, after the 2011
1486 # experiment was apparently successful.)
1487 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1488 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1489 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1490 Rule Falk 1939 only - Oct 1 0:00 1:00 S
1491 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1492 Rule Falk 1943 only - Jan 1 0:00 0 -
1493 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1494 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1495 Rule Falk 1984 only - Sep 16 0:00 1:00 S
1496 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1497 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1498 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1499 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 S
1500 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1501 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1502 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1503 -4:00 Falk -04/-03 1983 May
1504 -3:00 Falk -03/-02 1985 Sep 15
1505 -4:00 Falk -04/-03 2010 Sep 5 2:00
1506 -3:00 - -03
1507
1508 # French Guiana
1509 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1510 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1511 -4:00 - -04 1967 Oct
1512 -3:00 - -03
1513
1514 # Guyana
1515 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1516 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1517 -3:45 - -0345 1975 Jul 31
1518 -3:00 - -03 1991
1519 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1520 -4:00 - -04
1521
1522 # Paraguay
1523 #
1524 # From Paul Eggert (2006-03-22):
1525 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1526 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1527 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1528 #
1529 # From Waldemar Villamayor-Venialbo (2013-09-20):
1530 # No time of the day is established for the adjustment, so people normally
1531 # adjust their clocks at 0 hour of the given dates.
1532 #
1533 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1534 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1535 Rule Para 1975 1978 - Mar 1 0:00 0 -
1536 Rule Para 1979 1991 - Apr 1 0:00 0 -
1537 Rule Para 1989 only - Oct 22 0:00 1:00 S
1538 Rule Para 1990 only - Oct 1 0:00 1:00 S
1539 Rule Para 1991 only - Oct 6 0:00 1:00 S
1540 Rule Para 1992 only - Mar 1 0:00 0 -
1541 Rule Para 1992 only - Oct 5 0:00 1:00 S
1542 Rule Para 1993 only - Mar 31 0:00 0 -
1543 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1544 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1545 Rule Para 1996 only - Mar 1 0:00 0 -
1546 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1547 # From Steffen Thorsen (2000-10-02):
1548 # I have three independent reports that Paraguay changed to DST this Sunday
1549 # (10-01).
1550 #
1551 # Translated by Gwillim Law (2001-02-27) from
1552 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1553 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1554 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1555 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1556 # system has been operating for several years. Formerly there was a separate
1557 # decree each year; the new law has the same effect, but permanently. Every
1558 # year, the time will change on the first Sunday of October; likewise, the
1559 # clock will be set back on the first Sunday of March.
1560 #
1561 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1562 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1563 Rule Para 1997 only - Feb lastSun 0:00 0 -
1564 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1565 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1566 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1567 # From Rives McDow (2002-02-28):
1568 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1569 # dst method to be from the first Sunday in September to the first Sunday in
1570 # April.
1571 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1572 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1573 #
1574 # From Jesper Nørgaard Welen (2005-01-02):
1575 # There are several sources that claim that Paraguay made
1576 # a timezone rule change in autumn 2004.
1577 # From Steffen Thorsen (2005-01-05):
1578 # Decree 1,867 (2004-03-05)
1579 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1580 # http://www.presidencia.gov.py/decretos/D1867.pdf
1581 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 S
1582 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1583 # From Carlos Raúl Perasso (2010-02-18):
1584 # By decree number 3958 issued yesterday
1585 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1586 # Paraguay changes its DST schedule, postponing the March rule to April and
1587 # modifying the October date. The decree reads:
1588 # ...
1589 # Art. 1. It is hereby established that from the second Sunday of the month of
1590 # April of this year (2010), the official time is to be set back 60 minutes,
1591 # and that on the first Sunday of the month of October, it is to be set
1592 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1593 # ...
1594 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S
1595 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1596 #
1597 # From Steffen Thorsen (2013-03-07):
1598 # Paraguay will end DST on 2013-03-24 00:00....
1599 # http://www.ande.gov.py/interna.php?id=1075
1600 #
1601 # From Carlos Raúl Perasso (2013-03-15):
1602 # The change in Paraguay is now final. Decree number 10780
1603 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1604 # From Carlos Raúl Perasso (2014-02-28):
1605 # Decree 1264 can be found at:
1606 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1607 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1608
1609 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1610 Zone America/Asuncion -3:50:40 - LMT 1890
1611 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1612 -4:00 - -04 1972 Oct
1613 -3:00 - -03 1974 Apr
1614 -4:00 Para -04/-03
1615
1616 # Peru
1617 #
1618 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1619 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1620 # When we were in Peru in 1985-1986, they apparently switched over
1621 # sometime between December 29 and January 3 while we were on the Amazon.
1622 #
1623 # From Paul Eggert (2006-03-22):
1624 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1625
1626 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1627 Rule Peru 1938 only - Jan 1 0:00 1:00 S
1628 Rule Peru 1938 only - Apr 1 0:00 0 -
1629 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1630 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1631 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1632 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1633 Rule Peru 1990 only - Jan 1 0:00 1:00 S
1634 Rule Peru 1990 only - Apr 1 0:00 0 -
1635 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1636 Rule Peru 1994 only - Jan 1 0:00 1:00 S
1637 Rule Peru 1994 only - Apr 1 0:00 0 -
1638 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1639 Zone America/Lima -5:08:12 - LMT 1890
1640 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1641 -5:00 Peru -05/-04
1642
1643 # South Georgia
1644 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1645 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1646 -2:00 - -02
1647
1648 # South Sandwich Is
1649 # uninhabited; scientific personnel have wintered
1650
1651 # Suriname
1652 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1653 Zone America/Paramaribo -3:40:40 - LMT 1911
1654 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1655 -3:40:36 - PMT 1945 Oct # The capital moved?
1656 -3:30 - -0330 1984 Oct
1662 -4:00 - AST
1663
1664 # These all agree with Trinidad and Tobago since 1970.
1665 Link America/Port_of_Spain America/Anguilla
1666 Link America/Port_of_Spain America/Antigua
1667 Link America/Port_of_Spain America/Dominica
1668 Link America/Port_of_Spain America/Grenada
1669 Link America/Port_of_Spain America/Guadeloupe
1670 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1671 Link America/Port_of_Spain America/Montserrat
1672 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1673 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1674 Link America/Port_of_Spain America/St_Lucia
1675 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1676 Link America/Port_of_Spain America/St_Vincent
1677 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1678
1679 # Uruguay
1680 # From Paul Eggert (1993-11-18):
1681 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1682 # From Shanks & Pottenger:
1683 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1684 # Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1685 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1686 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1687 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1688 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1689 # Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1690 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1691 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1692 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1693 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1694 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1695 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1696 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
1697 Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1698 Rule Uruguay 1942 only - Jan 1 0:00 0 -
1699 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1700 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1701 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1702 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1703 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1704 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1705 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1706 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1707 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1708 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1709 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1710 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1711 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1712 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1713 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1714 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1715 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1716 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1717 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1718 Rule Uruguay 1980 only - May 1 0:00 0 -
1719 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1720 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1721 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1722 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1723 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1724 # Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1725 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1726 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1727 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1728 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1729 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1730 # From Eduardo Cota (2004-09-20):
1731 # The Uruguayan government has decreed a change in the local time....
1732 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1733 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1734 # From Steffen Thorsen (2005-03-11):
1735 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1736 # save energy ... it was postponed two weeks....
1737 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1738 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1739 # From Eduardo Cota (2005-09-27):
1740 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1741 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1742 # 02:00 local time, official time in Uruguay will be at GMT -2.
1743 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1744 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1745 # From Jesper Nørgaard Welen (2006-09-06):
1746 # http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1747 #
1748 # From Steffen Thorsen (2015-06-30):
1749 # ... it looks like they will not be using DST the coming summer:
1750 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1751 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1752 # From Paul Eggert (2015-06-30):
1753 # Apparently restaurateurs complained that DST caused people to go to the beach
1754 # instead of out to dinner.
1755 # From Pablo Camargo (2015-07-13):
1756 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1757 # [dated 2015-06-29; repeals Decree 311/006 dated 2006-09-04]
1758 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 S
1759 Rule Uruguay 2007 2015 - Mar Sun>=8 2:00 0 -
1760
1761 # This Zone can be simplified once we assume zic %z.
1762 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1763 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1764 -3:30 Uruguay -0330/-03 1942 Dec 14
1765 -3:00 Uruguay -03/-02 1968
1766 -3:00 Uruguay -03/-0230 1971
1767 -3:00 Uruguay -03/-02 1974
1768 -3:00 Uruguay -03/-0230 1974 Dec 22
1769 -3:00 Uruguay -03/-02
1770
1771 # Venezuela
1772 #
1773 # From Paul Eggert (2015-07-28):
1774 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1775 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1776 #
1777 # From John Stainforth (2007-11-28):
1778 # ... the change for Venezuela originally expected for 2007-12-31 has
1779 # been brought forward to 2007-12-09. The official announcement was
1780 # published today in the "Gaceta Oficial de la República Bolivariana
1781 # de Venezuela, número 38.819" (official document for all laws or
1782 # resolution publication)
1783 # http://www.globovision.com/news.php?nid=72208
1784
1785 # From Alexander Krivenyshev (2016-04-15):
1786 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1787 #
|
30 # invented and did not reflect common practice.
31
32 ###############################################################################
33
34 ###############################################################################
35
36 # Argentina
37
38 # From Bob Devine (1988-01-28):
39 # Argentina: first Sunday in October to first Sunday in April since 1976.
40 # Double Summer time from 1969 to 1974. Switches at midnight.
41
42 # From U. S. Naval Observatory (1988-01-19):
43 # ARGENTINA 3 H BEHIND UTC
44
45 # From Hernan G. Otero (1995-06-26):
46 # I am sending modifications to the Argentine time zone table...
47 # AR was chosen because they are the ISO letters that represent Argentina.
48
49 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
50 Rule Arg 1930 only - Dec 1 0:00 1:00 -
51 Rule Arg 1931 only - Apr 1 0:00 0 -
52 Rule Arg 1931 only - Oct 15 0:00 1:00 -
53 Rule Arg 1932 1940 - Mar 1 0:00 0 -
54 Rule Arg 1932 1939 - Nov 1 0:00 1:00 -
55 Rule Arg 1940 only - Jul 1 0:00 1:00 -
56 Rule Arg 1941 only - Jun 15 0:00 0 -
57 Rule Arg 1941 only - Oct 15 0:00 1:00 -
58 Rule Arg 1943 only - Aug 1 0:00 0 -
59 Rule Arg 1943 only - Oct 15 0:00 1:00 -
60 Rule Arg 1946 only - Mar 1 0:00 0 -
61 Rule Arg 1946 only - Oct 1 0:00 1:00 -
62 Rule Arg 1963 only - Oct 1 0:00 0 -
63 Rule Arg 1963 only - Dec 15 0:00 1:00 -
64 Rule Arg 1964 1966 - Mar 1 0:00 0 -
65 Rule Arg 1964 1966 - Oct 15 0:00 1:00 -
66 Rule Arg 1967 only - Apr 2 0:00 0 -
67 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 -
68 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
69 Rule Arg 1974 only - Jan 23 0:00 1:00 -
70 Rule Arg 1974 only - May 1 0:00 0 -
71 Rule Arg 1988 only - Dec 1 0:00 1:00 -
72 #
73 # From Hernan G. Otero (1995-06-26):
74 # These corrections were contributed by InterSoft Argentina S.A.,
75 # obtaining the data from the:
76 # Talleres de Hidrografía Naval Argentina
77 # (Argentine Naval Hydrography Institute)
78 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
79 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 -
80 #
81 # From Hernan G. Otero (1995-06-26):
82 # From this moment on, the law that mandated the daylight saving
83 # time corrections was derogated and no more modifications
84 # to the time zones (for daylight saving) are now made.
85 #
86 # From Rives McDow (2000-01-10):
87 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
88 # which did not result in the switch of a time zone, as they stayed 9 hours
89 # from the International Date Line.
90 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 -
91 # From Paul Eggert (2007-12-28):
92 # DST was set to expire on March 5, not March 3, but since it was converted
93 # to standard time on March 3 it's more convenient for us to pretend that
94 # it ended on March 3.
95 Rule Arg 2000 only - Mar 3 0:00 0 -
96 #
97 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
98 # We just checked with our São Paulo office and they say the government of
99 # Argentina decided not to become one of the countries that go on or off DST.
100 # So Buenos Aires should be -3 hours from GMT at all times.
101 #
102 # From Fabián L. Arce Jofré (2000-04-04):
103 # The law that claimed DST for Argentina was derogated by President Fernando
104 # de la Rúa on March 2, 2000, because it would make people spend more energy
105 # in the winter time, rather than less. The change took effect on March 3.
106 #
107 # From Mariano Absatz (2001-06-06):
108 # one of the major newspapers here in Argentina said that the 1999
109 # Timezone Law (which never was effectively applied) will (would?) be
110 # in effect.... The article is at
173 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
174 #
175 # Press release 235 dated Saturday October 18th, from the Government of the
176 # Province of Jujuy saying it will not apply DST either (even when it was not
177 # included in Decree 1705/2008).
178 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
179
180 # From fullinet (2009-10-18):
181 # As announced in
182 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
183 # (an official .gob.ar) under title: "Sin Cambio de Hora"
184 # (English: "No hour change").
185 #
186 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
187 # oficial, decisión que estaba en estudio para su implementación el
188 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
189 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
190 # la modificación del huso horario, ya que 2009 nos encuentra con
191 # crecimiento en la producción y distribución energética."
192
193 Rule Arg 2007 only - Dec 30 0:00 1:00 -
194 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
195 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 -
196
197 # From Mariano Absatz (2004-05-21):
198 # Today it was officially published that the Province of Mendoza is changing
199 # its timezone this winter... starting tomorrow night....
200 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
201 # From Paul Eggert (2004-05-24):
202 # It's Law No. 7,210. This change is due to a public power emergency, so for
203 # now we'll assume it's for this year only.
204 #
205 # From Paul Eggert (2018-01-31):
206 # Hora de verano para la República Argentina
207 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
208 # says that standard time in Argentina from 1894-10-31
209 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
210 # over Shanks & Pottenger. It is upward compatible with Milne, who
211 # says Córdoba time was -4:16:48.2.
212
213 #
214 # From Mariano Absatz (2004-06-05):
215 # These media articles from a major newspaper mostly cover the current state:
216 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
217 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
218 #
219 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
220 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
221 # Apparently, all nine provinces would go back to UTC-03:00 at the same
222 # time in October 17th.
223 #
224 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
225 # Tierra del Fuego, Tucumán.
226 #
227 # From Mariano Absatz (2004-06-14):
228 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
229 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
230 # annoyance with the change is much higher than the power savings obtained....
231 #
232 # From Gwillim Law (2004-06-14):
366 # America/Argentina/San_Luis entries should change to use these...
367 # ...
368
369 # From Alexander Krivenyshev (2010-04-09):
370 # According to news reports from El Diario de la República Province San
371 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
372 # after April 11, 2010 - will continue to have same time as rest of
373 # Argentina (UTC-3) (no DST).
374 #
375 # Confirmaron la prórroga del huso horario de verano (Spanish)
376 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
377 # or (some English translation):
378 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
379
380 # From Mariano Absatz (2010-04-12):
381 # yes...I can confirm this...and given that San Luis keeps calling
382 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
383 # rules...San Luis is still using "Western ARgentina Time" and it got
384 # stuck on Summer daylight savings time even though the summer is over.
385
386 # From Paul Eggert (2018-01-23):
387 # Perhaps San Luis operates on the legal fiction that it is at -04
388 # with perpetual daylight saving time, but ordinary usage typically seems to
389 # just say it's at -03; see, for example,
390 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
391 # We've documented similar situations as being plain changes to
392 # standard time, so let's do that here too. This does not change UTC
393 # offsets, only tm_isdst and the time zone abbreviations. One minor
394 # plus is that this silences a zic complaint that there's no POSIX TZ
395 # setting for time stamps past 2038.
396
397 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
398 #
399 # Buenos Aires (BA), Capital Federal (CF),
400 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
401 -4:16:48 - CMT 1920 May # Córdoba Mean Time
402 -4:00 - -04 1930 Dec
403 -4:00 Arg -04/-03 1969 Oct 5
404 -3:00 Arg -03/-02 1999 Oct 3
405 -4:00 Arg -04/-03 2000 Mar 3
406 -3:00 Arg -03/-02
407 #
408 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
409 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
410 #
411 # Shanks & Pottenger also make the following claims, which we haven't verified:
412 # - Formosa switched to -3:00 on 1991-01-07.
413 # - Misiones switched to -3:00 on 1990-12-29.
414 # - Chaco switched to -3:00 on 1991-01-04.
415 # - Santiago del Estero switched to -4:00 on 1991-04-01,
416 # then to -3:00 on 1991-04-26.
511 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
512 -4:16:48 - CMT 1920 May
513 -4:00 - -04 1930 Dec
514 -4:00 Arg -04/-03 1969 Oct 5
515 -3:00 Arg -03/-02 1990 Mar 4
516 -4:00 - -04 1990 Oct 15
517 -4:00 1:00 -03 1991 Mar 1
518 -4:00 - -04 1991 Oct 15
519 -4:00 1:00 -03 1992 Mar 1
520 -4:00 - -04 1992 Oct 18
521 -3:00 Arg -03/-02 1999 Oct 3
522 -4:00 Arg -04/-03 2000 Mar 3
523 -3:00 - -03 2004 May 23
524 -4:00 - -04 2004 Sep 26
525 -3:00 Arg -03/-02 2008 Oct 18
526 -3:00 - -03
527 #
528 # San Luis (SL)
529
530 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
531 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 -
532
533 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
534 -4:16:48 - CMT 1920 May
535 -4:00 - -04 1930 Dec
536 -4:00 Arg -04/-03 1969 Oct 5
537 -3:00 Arg -03/-02 1990
538 -3:00 1:00 -02 1990 Mar 14
539 -4:00 - -04 1990 Oct 15
540 -4:00 1:00 -03 1991 Mar 1
541 -4:00 - -04 1991 Jun 1
542 -3:00 - -03 1999 Oct 3
543 -4:00 1:00 -03 2000 Mar 3
544 -3:00 - -03 2004 May 31
545 -4:00 - -04 2004 Jul 25
546 -3:00 Arg -03/-02 2008 Jan 21
547 -4:00 SanLuis -04/-03 2009 Oct 11
548 -3:00 - -03
549 #
550 # Santa Cruz (SC)
551 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
753 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
754
755 # From Steffen Thorsen (2013-09-20):
756 # Tocantins in Brazil is very likely not to observe DST from October....
757 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
758 # We will keep this article updated when this is confirmed:
759 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
760
761 # From Steffen Thorsen (2013-10-17):
762 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
763 # Senator Jorge Viana announced that Acre will change time zone on November 10.
764 # He did not specify the time of the change, nor if western parts of Amazonas
765 # will change as well.
766 #
767 # From Paul Eggert (2013-10-17):
768 # For now, assume western Amazonas will change as well.
769
770 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
771 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
772 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
773 Rule Brazil 1931 only - Oct 3 11:00 1:00 -
774 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
775 Rule Brazil 1932 only - Oct 3 0:00 1:00 -
776 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
777 # revoked DST.
778 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
779 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
780 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 -
781 Rule Brazil 1950 only - Apr 16 1:00 0 -
782 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
783 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
784 Rule Brazil 1953 only - Mar 1 0:00 0 -
785 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
786 # revoked DST.
787 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
788 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
789 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
790 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
791 # extended the above decree to all of the national territory on 12-09.
792 Rule Brazil 1963 only - Dec 9 0:00 1:00 -
793 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
794 # extended summer time by one day to 1964-03-01 00:00 (start of school).
795 Rule Brazil 1964 only - Mar 1 0:00 0 -
796 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
797 Rule Brazil 1965 only - Jan 31 0:00 1:00 -
798 Rule Brazil 1965 only - Mar 31 0:00 0 -
799 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
800 Rule Brazil 1965 only - Dec 1 0:00 1:00 -
801 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
802 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
803 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 -
804 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
805 # revoked DST.
806 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
807 Rule Brazil 1985 only - Nov 2 0:00 1:00 -
808 # Decree 92,310 (1986-01-21)
809 # Decree 92,463 (1986-03-13)
810 Rule Brazil 1986 only - Mar 15 0:00 0 -
811 # Decree 93,316 (1986-10-01)
812 Rule Brazil 1986 only - Oct 25 0:00 1:00 -
813 Rule Brazil 1987 only - Feb 14 0:00 0 -
814 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
815 Rule Brazil 1987 only - Oct 25 0:00 1:00 -
816 Rule Brazil 1988 only - Feb 7 0:00 0 -
817 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
818 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
819 Rule Brazil 1988 only - Oct 16 0:00 1:00 -
820 Rule Brazil 1989 only - Jan 29 0:00 0 -
821 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
822 # with the same exceptions
823 Rule Brazil 1989 only - Oct 15 0:00 1:00 -
824 Rule Brazil 1990 only - Feb 11 0:00 0 -
825 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
826 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
827 # Decree 99,629 (1990-10-19) adds BA, MT.
828 Rule Brazil 1990 only - Oct 21 0:00 1:00 -
829 Rule Brazil 1991 only - Feb 17 0:00 0 -
830 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
831 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
832 Rule Brazil 1991 only - Oct 20 0:00 1:00 -
833 Rule Brazil 1992 only - Feb 9 0:00 0 -
834 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
835 # adopted by same states.
836 Rule Brazil 1992 only - Oct 25 0:00 1:00 -
837 Rule Brazil 1993 only - Jan 31 0:00 0 -
838 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
839 # adopted by same states, plus AM.
840 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
841 # web page corrected 2004-01-07) adopted by same states, minus AM.
842 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
843 # adopted by same states, plus MT and TO.
844 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
845 # adds AL, SE.
846 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 -
847 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
848 Rule Brazil 1996 only - Feb 11 0:00 0 -
849 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
850 # adopted by same states, minus AL, SE.
851 Rule Brazil 1996 only - Oct 6 0:00 1:00 -
852 Rule Brazil 1997 only - Feb 16 0:00 0 -
853 # From Daniel C. Sobral (1998-02-12):
854 # In 1997, the DS began on October 6. The stated reason was that
855 # because international television networks ignored Brazil's policy on DS,
856 # they bought the wrong times on satellite for coverage of Pope's visit.
857 # This year, the ending date of DS was postponed to March 1
858 # to help dealing with the shortages of electric power.
859 #
860 # Decree 2,317 (1997-09-04), adopted by same states.
861 Rule Brazil 1997 only - Oct 6 0:00 1:00 -
862 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
863 # (1998-02-10)
864 Rule Brazil 1998 only - Mar 1 0:00 0 -
865 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
866 # adopted by the same states as before.
867 Rule Brazil 1998 only - Oct 11 0:00 1:00 -
868 Rule Brazil 1999 only - Feb 21 0:00 0 -
869 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
870 # (1999-08-23) adopted by same states.
871 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
872 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
873 Rule Brazil 1999 only - Oct 3 0:00 1:00 -
874 Rule Brazil 2000 only - Feb 27 0:00 0 -
875 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
876 # adopted by the same states as before.
877 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
878 # repeals DST in PE and RR, effective 2000-10-15 00:00.
879 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
880 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
881 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
882 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
883 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 -
884 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
885 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
886 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
887 Rule Brazil 2002 only - Nov 3 0:00 1:00 -
888 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
889 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
890 Rule Brazil 2003 only - Oct 19 0:00 1:00 -
891 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
892 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
893 Rule Brazil 2004 only - Nov 2 0:00 1:00 -
894 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
895 # adopted by the same states as before.
896 Rule Brazil 2005 only - Oct 16 0:00 1:00 -
897 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
898 # adopted by the same states as before.
899 Rule Brazil 2006 only - Nov 5 0:00 1:00 -
900 Rule Brazil 2007 only - Feb 25 0:00 0 -
901 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
902 # adopted by the same states as before.
903 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 -
904 # From Frederico A. C. Neves (2008-09-10):
905 # According to this decree
906 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
907 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
908 # 3rd Feb Sunday. There is an exception on the return date when this is
909 # the Carnival Sunday then the return date will be the next Sunday...
910 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 -
911 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
912 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
913 # added Bahia.
914 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
915 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
916 # removed Bahia and added Tocantins.
917 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
918 # removed Tocantins.
919 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
920 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
921 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
922 # From Steffen Thorsen (2017-12-18):
923 # According to many media sources, next year's DST start in Brazil will move to
924 # the first Sunday of November, and it will stay like that for the years after.
925 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
926 # From Steffen Thorsen (2017-12-20):
927 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
928 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 -
929 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
930 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
931 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
932 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
933 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
934 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
935 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
936 # From Arthur David Olson (2008-09-29):
937 # The next is wrong in some years but is better than nothing.
938 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
939
940 # The latest ruleset listed above says that the following states observe DST:
941 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
942
943 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
944 #
945 # Fernando de Noronha (administratively part of PE)
946 Zone America/Noronha -2:09:40 - LMT 1914
947 -2:00 Brazil -02/-01 1990 Sep 17
948 -2:00 - -02 1999 Sep 30
1215 #
1216 # From Paul Eggert (2016-03-18):
1217 # For now, assume the pattern holds for the indefinite future.
1218 # The decree says transitions occur at 24:00; in practice this appears
1219 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1220 # Island is always two hours behind the mainland.
1221
1222 # From Juan Correa (2016-12-04):
1223 # Magallanes region ... will keep DST (UTC -3) all year round....
1224 # 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
1225 #
1226 # From Deborah Goldsmith (2017-01-19):
1227 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1228 # From Paul Eggert (2017-01-19):
1229 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1230 # so in theory, they will revert to -04/-03 after that, which means
1231 # they will switch from -03 to -04 one hour after Santiago does that day.
1232 # For now, assume that they will not revert.
1233
1234 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1235 Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
1236 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1237 Rule Chile 1968 only - Nov 3 4:00u 1:00 -
1238 Rule Chile 1969 only - Mar 30 3:00u 0 -
1239 Rule Chile 1969 only - Nov 23 4:00u 1:00 -
1240 Rule Chile 1970 only - Mar 29 3:00u 0 -
1241 Rule Chile 1971 only - Mar 14 3:00u 0 -
1242 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 -
1243 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1244 Rule Chile 1973 only - Sep 30 4:00u 1:00 -
1245 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 -
1246 Rule Chile 1987 only - Apr 12 3:00u 0 -
1247 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1248 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 -
1249 Rule Chile 1990 only - Sep 16 4:00u 1:00 -
1250 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1251 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 -
1252 Rule Chile 1997 only - Mar 30 3:00u 0 -
1253 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1254 Rule Chile 1998 only - Sep 27 4:00u 1:00 -
1255 Rule Chile 1999 only - Apr 4 3:00u 0 -
1256 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 -
1257 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1258 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1259 # which is used below in specifying the transition.
1260 Rule Chile 2008 only - Mar 30 3:00u 0 -
1261 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1262 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1263 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1264 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 -
1265 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1266 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 -
1267 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1268 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 -
1269 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1270 # (1996-09) says 1998-03-08. Ignore these.
1271 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1272 Zone America/Santiago -4:42:46 - LMT 1890
1273 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1274 -5:00 - -05 1916 Jul 1
1275 -4:42:46 - SMT 1918 Sep 10
1276 -4:00 - -04 1919 Jul 1
1277 -4:42:46 - SMT 1927 Sep 1
1278 -5:00 Chile -05/-04 1932 Sep 1
1279 -4:00 - -04 1942 Jun 1
1280 -5:00 - -05 1942 Aug 1
1281 -4:00 - -04 1946 Jul 15
1282 -4:00 1:00 -03 1946 Sep 1 # central Chile
1283 -4:00 - -04 1947 Apr 1
1284 -5:00 - -05 1947 May 21 23:00
1285 -4:00 Chile -04/-03
1286 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1287 -4:42:46 - SMT 1910 Jan 10
1288 -5:00 - -05 1916 Jul 1
1313 # From Ethan Dicks (1996-10-06):
1314 # It keeps the same time as Punta Arenas, Chile, because, just like us
1315 # and the South Pole, that's the other end of their supply line....
1316 # I verified with someone who was there that since 1980,
1317 # Palmer has followed Chile. Prior to that, before the Falklands War,
1318 # Palmer used to be supplied from Argentina.
1319 #
1320 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1321 Zone Antarctica/Palmer 0 - -00 1965
1322 -4:00 Arg -04/-03 1969 Oct 5
1323 -3:00 Arg -03/-02 1982 May
1324 -4:00 Chile -04/-03 2016 Dec 4
1325 -3:00 - -03
1326
1327 # Colombia
1328
1329 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1330 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1331
1332 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1333 Rule CO 1992 only - May 3 0:00 1:00 -
1334 Rule CO 1993 only - Apr 4 0:00 0 -
1335 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1336 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1337 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1338 -5:00 CO -05/-04
1339 # Malpelo, Providencia, San Andres
1340 # no information; probably like America/Bogota
1341
1342 # Curaçao
1343
1344 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1345 #
1346 # From Paul Eggert (2006-03-22):
1347 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1348 # -4:00 since standard time was introduced on 1912-03-02; and that
1349 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1350 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1351 # Saba Island has been like Curaçao.
1352 # This all predates our 1970 cutoff, though.
1353 #
1373 # Ecuador
1374 #
1375 # Milne says the Central and South American Telegraph Company used -5:24:15.
1376 #
1377 # From Alois Treindl (2016-12-15):
1378 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1379 # ... Whether the law applied also to Galápagos, I do not know.
1380 # From Paul Eggert (2016-12-15):
1381 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1382 # This says President Sixto Durán Ballén signed decree No. 285, which
1383 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1384 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1385 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1386 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1387 # sol" ("It was dawning in the middle of the night, the buses went to class
1388 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1389 # (Not one step back), the clocks went back in 1993 and the experiment was not
1390 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1391 #
1392 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1393 Rule Ecuador 1992 only - Nov 28 0:00 1:00 -
1394 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1395 #
1396 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1397 Zone America/Guayaquil -5:19:20 - LMT 1890
1398 -5:14:00 - QMT 1931 # Quito Mean Time
1399 -5:00 Ecuador -05/-04
1400 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1401 -5:00 - -05 1986
1402 -6:00 Ecuador -06/-05
1403
1404 # Falklands
1405
1406 # From Paul Eggert (2006-03-22):
1407 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1408 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1409
1410 # From Falkland Islands Government Office, London (2001-01-22)
1411 # via Jesper Nørgaard:
1412 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1413 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1463 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1464 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1465 # hours) on the first Sunday of September at 0200hrs.
1466 #
1467 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1468 # will not revert to local mean time, but clocks will remain on Summer
1469 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1470 # change to local time following the trial period will be notified.
1471 #
1472 # From Andrew Newman (2012-02-24)
1473 # A letter from Justin McPhee, Chief Executive,
1474 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1475 # states...
1476 # The current Atlantic/Stanley entry under South America expects the
1477 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1478 # The database entry states that in 2011 Stanley was staying on fixed
1479 # summer time on a trial basis only. FIG need to contact IANA and/or
1480 # the maintainers of the database to inform them we're adopting
1481 # the same policy this year and suggest recommendations for future years.
1482 #
1483 # For now we will assume permanent -03 for the Falklands
1484 # until advised differently (to apply for 2012 and beyond, after the 2011
1485 # experiment was apparently successful.)
1486 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1487 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 -
1488 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1489 Rule Falk 1939 only - Oct 1 0:00 1:00 -
1490 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 -
1491 Rule Falk 1943 only - Jan 1 0:00 0 -
1492 Rule Falk 1983 only - Sep lastSun 0:00 1:00 -
1493 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1494 Rule Falk 1984 only - Sep 16 0:00 1:00 -
1495 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 -
1496 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1497 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1498 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 -
1499 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1500 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1501 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1502 -4:00 Falk -04/-03 1983 May
1503 -3:00 Falk -03/-02 1985 Sep 15
1504 -4:00 Falk -04/-03 2010 Sep 5 2:00
1505 -3:00 - -03
1506
1507 # French Guiana
1508 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1509 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1510 -4:00 - -04 1967 Oct
1511 -3:00 - -03
1512
1513 # Guyana
1514 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1515 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1516 -3:45 - -0345 1975 Jul 31
1517 -3:00 - -03 1991
1518 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1519 -4:00 - -04
1520
1521 # Paraguay
1522 #
1523 # From Paul Eggert (2006-03-22):
1524 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1525 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1526 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1527 #
1528 # From Waldemar Villamayor-Venialbo (2013-09-20):
1529 # No time of the day is established for the adjustment, so people normally
1530 # adjust their clocks at 0 hour of the given dates.
1531 #
1532 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1533 Rule Para 1975 1988 - Oct 1 0:00 1:00 -
1534 Rule Para 1975 1978 - Mar 1 0:00 0 -
1535 Rule Para 1979 1991 - Apr 1 0:00 0 -
1536 Rule Para 1989 only - Oct 22 0:00 1:00 -
1537 Rule Para 1990 only - Oct 1 0:00 1:00 -
1538 Rule Para 1991 only - Oct 6 0:00 1:00 -
1539 Rule Para 1992 only - Mar 1 0:00 0 -
1540 Rule Para 1992 only - Oct 5 0:00 1:00 -
1541 Rule Para 1993 only - Mar 31 0:00 0 -
1542 Rule Para 1993 1995 - Oct 1 0:00 1:00 -
1543 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1544 Rule Para 1996 only - Mar 1 0:00 0 -
1545 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1546 # From Steffen Thorsen (2000-10-02):
1547 # I have three independent reports that Paraguay changed to DST this Sunday
1548 # (10-01).
1549 #
1550 # Translated by Gwillim Law (2001-02-27) from
1551 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1552 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1553 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1554 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1555 # system has been operating for several years. Formerly there was a separate
1556 # decree each year; the new law has the same effect, but permanently. Every
1557 # year, the time will change on the first Sunday of October; likewise, the
1558 # clock will be set back on the first Sunday of March.
1559 #
1560 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 -
1561 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1562 Rule Para 1997 only - Feb lastSun 0:00 0 -
1563 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1564 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1565 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1566 # From Rives McDow (2002-02-28):
1567 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1568 # dst method to be from the first Sunday in September to the first Sunday in
1569 # April.
1570 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1571 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 -
1572 #
1573 # From Jesper Nørgaard Welen (2005-01-02):
1574 # There are several sources that claim that Paraguay made
1575 # a timezone rule change in autumn 2004.
1576 # From Steffen Thorsen (2005-01-05):
1577 # Decree 1,867 (2004-03-05)
1578 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1579 # http://www.presidencia.gov.py/decretos/D1867.pdf
1580 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 -
1581 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1582 # From Carlos Raúl Perasso (2010-02-18):
1583 # By decree number 3958 issued yesterday
1584 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1585 # Paraguay changes its DST schedule, postponing the March rule to April and
1586 # modifying the October date. The decree reads:
1587 # ...
1588 # Art. 1. It is hereby established that from the second Sunday of the month of
1589 # April of this year (2010), the official time is to be set back 60 minutes,
1590 # and that on the first Sunday of the month of October, it is to be set
1591 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1592 # ...
1593 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 -
1594 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1595 #
1596 # From Steffen Thorsen (2013-03-07):
1597 # Paraguay will end DST on 2013-03-24 00:00....
1598 # http://www.ande.gov.py/interna.php?id=1075
1599 #
1600 # From Carlos Raúl Perasso (2013-03-15):
1601 # The change in Paraguay is now final. Decree number 10780
1602 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1603 # From Carlos Raúl Perasso (2014-02-28):
1604 # Decree 1264 can be found at:
1605 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1606 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1607
1608 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1609 Zone America/Asuncion -3:50:40 - LMT 1890
1610 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1611 -4:00 - -04 1972 Oct
1612 -3:00 - -03 1974 Apr
1613 -4:00 Para -04/-03
1614
1615 # Peru
1616 #
1617 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1618 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1619 # When we were in Peru in 1985-1986, they apparently switched over
1620 # sometime between December 29 and January 3 while we were on the Amazon.
1621 #
1622 # From Paul Eggert (2006-03-22):
1623 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1624
1625 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1626 Rule Peru 1938 only - Jan 1 0:00 1:00 -
1627 Rule Peru 1938 only - Apr 1 0:00 0 -
1628 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 -
1629 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1630 Rule Peru 1986 1987 - Jan 1 0:00 1:00 -
1631 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1632 Rule Peru 1990 only - Jan 1 0:00 1:00 -
1633 Rule Peru 1990 only - Apr 1 0:00 0 -
1634 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1635 Rule Peru 1994 only - Jan 1 0:00 1:00 -
1636 Rule Peru 1994 only - Apr 1 0:00 0 -
1637 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1638 Zone America/Lima -5:08:12 - LMT 1890
1639 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1640 -5:00 Peru -05/-04
1641
1642 # South Georgia
1643 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1644 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1645 -2:00 - -02
1646
1647 # South Sandwich Is
1648 # uninhabited; scientific personnel have wintered
1649
1650 # Suriname
1651 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1652 Zone America/Paramaribo -3:40:40 - LMT 1911
1653 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1654 -3:40:36 - PMT 1945 Oct # The capital moved?
1655 -3:30 - -0330 1984 Oct
1661 -4:00 - AST
1662
1663 # These all agree with Trinidad and Tobago since 1970.
1664 Link America/Port_of_Spain America/Anguilla
1665 Link America/Port_of_Spain America/Antigua
1666 Link America/Port_of_Spain America/Dominica
1667 Link America/Port_of_Spain America/Grenada
1668 Link America/Port_of_Spain America/Guadeloupe
1669 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1670 Link America/Port_of_Spain America/Montserrat
1671 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1672 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1673 Link America/Port_of_Spain America/St_Lucia
1674 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1675 Link America/Port_of_Spain America/St_Vincent
1676 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1677
1678 # Uruguay
1679 # From Paul Eggert (1993-11-18):
1680 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1681 #
1682 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael
1683 # Deckers (2018-02-20):
1684 # ... At least they kept good records...
1685 #
1686 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36
1687 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and
1688 # Meteorology Service of the Uruguayan Navy, seems to give many transitions
1689 # with greater clarity than we've had before. It directly references many laws
1690 # and decrees which are, in turn, referenced below. They can be viewed in the
1691 # public archives of the Diario Oficial (in Spanish) at
1692 # http://www.impo.com.uy/diariooficial/
1693 #
1694 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the
1695 # auspices of the National Institute for the Prediction of Time. It is unclear
1696 # exactly what offset was used during this period, though Ley No. 7200 of
1697 # 1920-04-23 used the Observatory of the National Meteorological Institute in
1698 # Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian,
1699 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00,
1700 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on
1701 # page 725 of the Proceedings of the Second Pan-American Scientific Congress,
1702 # 1915-1916) was in use, and merely became official from 1908-06-10.
1703 # https://www.impo.com.uy/diariooficial/1908/06/18/12
1704 # https://www.impo.com.uy/diariooficial/1920/04/27/9
1705 #
1706 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced
1707 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14
1708 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the
1709 # National Council of Administration the same day, published directly below the
1710 # law in the Diario Oficial, specified the first transition to be 1923-09-30
1711 # 24:00. This effectively established standard time at UT-03:30 with 30
1712 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No.
1713 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other
1714 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolución
1715 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it
1716 # would have been under the previous law.
1717 # https://www.impo.com.uy/diariooficial/1923/07/02/2
1718 # https://www.impo.com.uy/diariooficial/1926/03/10/2
1719 # https://www.impo.com.uy/diariooficial/1926/03/18/2
1720 #
1721 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1722 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 -
1723 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1724 # From Tim Parenti (2018-02-15):
1725 # http://www.impo.com.uy/diariooficial/1933/10/27/6
1726 #
1727 # It appears Ley No. 9122 of 1933 was never published as such in the Diario
1728 # Oficial, but instead appeared as Document 26 in the Diario on Friday
1729 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of
1730 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the
1731 # last Sunday of October...until the last Saturday of March." In accordance
1732 # with this provision, the first transition was explicitly specified in Article
1733 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29
1734 # at 00:00. Assume transitions at 00:00 Sunday throughout.
1735 #
1736 # Departing from the matter-of-fact nature of previous timekeeping laws, the
1737 # 1933 decree "consider[s] the advantages of...the advance of legal time":
1738 #
1739 # "Whereas: The measure adopted by almost all nations at the time of the last
1740 # World War still persists in North America and Europe, precisely because of
1741 # the economic, hygienic, and social advantages derived from such an
1742 # emergency measure...
1743 #
1744 # Whereas: The advance of the legal time during the summer seasons, by
1745 # displacing social activity near sunrise, favors the citizen populations
1746 # and especially the society that creates and works..."
1747 #
1748 # It further specified that "necessary measures" be taken to ensure that
1749 # "public spectacles finish, in general, before [01:00]."
1750 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 -
1751 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 -
1752 # From Tim Parenti (2018-02-15):
1753 # Most of the Rules below, and their contemporaneous Zone lines, have been
1754 # updated simply to match the Almanaque 2018. Although the document does not
1755 # list exact transition times, midnight transitions were already present in our
1756 # data here for all transitions through 2004-09, and this is both consistent
1757 # with prior transitions and verified in several decrees marked below between
1758 # 1939-09 and 2004-09, wherein the relevant text was typically of the form:
1759 #
1760 # "From 0 hours on [date], the legal time of the entire Republic will be...
1761 #
1762 # In accordance with [the preceding], on [previous date] at 24 hours, all
1763 # clocks throughout the Republic will be [advanced/retarded] by..."
1764 #
1765 # It is possible that there is greater specificity to be found for the Rules
1766 # below, but it is buried in no fewer than 40 different decrees individually
1767 # referenced by the Almanaque for the period from 1939-09 to 2014-09.
1768 # Four-fifths of these were promulgated less than two weeks before taking
1769 # effect; more than half within a week and none more than 5 weeks. Only the
1770 # handful with comments below have been checked with any thoroughness.
1771 Rule Uruguay 1939 only - Oct 1 0:00 0:30 -
1772 Rule Uruguay 1940 only - Oct 27 0:00 0:30 -
1773 # From Tim Parenti (2018-02-15):
1774 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified
1775 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel".
1776 # http://www.impo.com.uy/diariooficial/1941/08/04/1
1777 Rule Uruguay 1941 only - Aug 1 0:00 0:30 -
1778 # From Tim Parenti (2018-02-15):
1779 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified
1780 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks
1781 # never went back to UT-03:30 thereafter, this is modeled as advancing standard
1782 # time by 30 minutes to UT-03, while retaining 30 minutes of DST.
1783 # http://www.impo.com.uy/diariooficial/1942/12/16/3
1784 Rule Uruguay 1942 only - Dec 14 0:00 0:30 -
1785 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1786 Rule Uruguay 1959 only - May 24 0:00 0:30 -
1787 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1788 Rule Uruguay 1960 only - Jan 17 0:00 1:00 -
1789 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1790 Rule Uruguay 1965 only - Apr 4 0:00 1:00 -
1791 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1792 # From Tim Parenti (2018-02-15):
1793 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the
1794 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00.
1795 # http://www.impo.com.uy/diariooficial/1968/05/30/5
1796 Rule Uruguay 1968 only - May 27 0:00 0:30 -
1797 Rule Uruguay 1968 only - Dec 1 0:00 0 -
1798 # From Tim Parenti (2018-02-15):
1799 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity
1800 # consumption "as a consequence of the current rainfall regime in the country".
1801 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00.
1802 # http://www.impo.com.uy/diariooficial/1970/04/29/4
1803 Rule Uruguay 1970 only - Apr 25 0:00 1:00 -
1804 Rule Uruguay 1970 only - Jun 14 0:00 0 -
1805 Rule Uruguay 1972 only - Apr 23 0:00 1:00 -
1806 Rule Uruguay 1972 only - Jul 16 0:00 0 -
1807 # From Tim Parenti (2018-02-15):
1808 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of
1809 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of
1810 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30
1811 # minutes followed in Decreto 679/974 of 1974-08-29.
1812 # http://www.impo.com.uy/diariooficial/1974/01/22/11
1813 # http://www.impo.com.uy/diariooficial/1974/03/14/3
1814 # http://www.impo.com.uy/diariooficial/1974/09/04/6
1815 Rule Uruguay 1974 only - Jan 13 0:00 1:30 -
1816 Rule Uruguay 1974 only - Mar 10 0:00 0:30 -
1817 Rule Uruguay 1974 only - Sep 1 0:00 0 -
1818 Rule Uruguay 1974 only - Dec 22 0:00 1:00 -
1819 Rule Uruguay 1975 only - Mar 30 0:00 0 -
1820 Rule Uruguay 1976 only - Dec 19 0:00 1:00 -
1821 Rule Uruguay 1977 only - Mar 6 0:00 0 -
1822 Rule Uruguay 1977 only - Dec 4 0:00 1:00 -
1823 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 -
1824 Rule Uruguay 1978 only - Dec 17 0:00 1:00 -
1825 Rule Uruguay 1979 only - Apr 29 0:00 1:00 -
1826 Rule Uruguay 1980 only - Mar 16 0:00 0 -
1827 # From Tim Parenti (2018-02-15):
1828 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist
1829 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00.
1830 # http://www.impo.com.uy/diariooficial/1988/01/25/1
1831 Rule Uruguay 1987 only - Dec 14 0:00 1:00 -
1832 Rule Uruguay 1988 only - Feb 28 0:00 0 -
1833 Rule Uruguay 1988 only - Dec 11 0:00 1:00 -
1834 Rule Uruguay 1989 only - Mar 5 0:00 0 -
1835 Rule Uruguay 1989 only - Oct 29 0:00 1:00 -
1836 Rule Uruguay 1990 only - Feb 25 0:00 0 -
1837 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04):
1838 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the
1839 # 1992/1993 season appears to be the first in over half a century where DST
1840 # both began and ended pursuant to the same decree.
1841 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 -
1842 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 -
1843 Rule Uruguay 1992 only - Oct 18 0:00 1:00 -
1844 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1845 # From Eduardo Cota (2004-09-20):
1846 # The Uruguayan government has decreed a change in the local time....
1847 # From Tim Parenti (2018-02-15):
1848 # Decreto 328/004 of 2004-09-15.
1849 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1
1850 Rule Uruguay 2004 only - Sep 19 0:00 1:00 -
1851 # From Steffen Thorsen (2005-03-11):
1852 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1853 # save energy ... it was postponed two weeks....
1854 # From Tim Parenti (2018-02-15):
1855 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous
1856 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending
1857 # Decreto 328/004:
1858 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1
1859 # The original decree specified a transition of 2005-03-12 24:00, but the new
1860 # one specified 2005-03-27 02:00.
1861 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1862 # From Eduardo Cota (2005-09-27):
1863 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time,
1864 # official time in Uruguay will be at GMT -2.
1865 # From Tim Parenti (2018-02-15):
1866 # Decreto 318/005 of 2005-09-19.
1867 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1
1868 Rule Uruguay 2005 only - Oct 9 2:00 1:00 -
1869 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 -
1870 # From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06):
1871 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday
1872 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque
1873 # 2018 appears to have a few typoed dates through this period; ignore them.
1874 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1
1875 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 -
1876 # From Steffen Thorsen (2015-06-30):
1877 # ... it looks like they will not be using DST the coming summer:
1878 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1879 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1880 # From Paul Eggert (2015-06-30):
1881 # Apparently restaurateurs complained that DST caused people to go to the beach
1882 # instead of out to dinner.
1883 # From Pablo Camargo (2015-07-13):
1884 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1885 # From Tim Parenti (2018-02-15):
1886 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.
1887
1888 # This Zone can be simplified once we assume zic %z.
1889 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10
1890 -3:44:51 - MMT 1920 May 1 # Montevideo MT
1891 -4:00 - -04 1923 Oct 1
1892 -3:30 Uruguay -0330/-03 1942 Dec 14
1893 -3:00 Uruguay -03/-0230 1960
1894 -3:00 Uruguay -03/-02 1968
1895 -3:00 Uruguay -03/-0230 1970
1896 -3:00 Uruguay -03/-02 1974
1897 -3:00 Uruguay -03/-0130 1974 Mar 10
1898 -3:00 Uruguay -03/-0230 1974 Dec 22
1899 -3:00 Uruguay -03/-02
1900
1901 # Venezuela
1902 #
1903 # From Paul Eggert (2015-07-28):
1904 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1905 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1906 #
1907 # From John Stainforth (2007-11-28):
1908 # ... the change for Venezuela originally expected for 2007-12-31 has
1909 # been brought forward to 2007-12-09. The official announcement was
1910 # published today in the "Gaceta Oficial de la República Bolivariana
1911 # de Venezuela, número 38.819" (official document for all laws or
1912 # resolution publication)
1913 # http://www.globovision.com/news.php?nid=72208
1914
1915 # From Alexander Krivenyshev (2016-04-15):
1916 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1917 #
|