53 # invented and did not reflect common practice.
54
55 ###############################################################################
56
57 ###############################################################################
58
59 # Argentina
60
61 # From Bob Devine (1988-01-28):
62 # Argentina: first Sunday in October to first Sunday in April since 1976.
63 # Double Summer time from 1969 to 1974. Switches at midnight.
64
65 # From U. S. Naval Observatory (1988-01-19):
66 # ARGENTINA 3 H BEHIND UTC
67
68 # From Hernan G. Otero (1995-06-26):
69 # I am sending modifications to the Argentine time zone table...
70 # AR was chosen because they are the ISO letters that represent Argentina.
71
72 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
73 Rule Arg 1930 only - Dec 1 0:00 1:00 S
74 Rule Arg 1931 only - Apr 1 0:00 0 -
75 Rule Arg 1931 only - Oct 15 0:00 1:00 S
76 Rule Arg 1932 1940 - Mar 1 0:00 0 -
77 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
78 Rule Arg 1940 only - Jul 1 0:00 1:00 S
79 Rule Arg 1941 only - Jun 15 0:00 0 -
80 Rule Arg 1941 only - Oct 15 0:00 1:00 S
81 Rule Arg 1943 only - Aug 1 0:00 0 -
82 Rule Arg 1943 only - Oct 15 0:00 1:00 S
83 Rule Arg 1946 only - Mar 1 0:00 0 -
84 Rule Arg 1946 only - Oct 1 0:00 1:00 S
85 Rule Arg 1963 only - Oct 1 0:00 0 -
86 Rule Arg 1963 only - Dec 15 0:00 1:00 S
87 Rule Arg 1964 1966 - Mar 1 0:00 0 -
88 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
89 Rule Arg 1967 only - Apr 2 0:00 0 -
90 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
91 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
92 Rule Arg 1974 only - Jan 23 0:00 1:00 S
93 Rule Arg 1974 only - May 1 0:00 0 -
94 Rule Arg 1988 only - Dec 1 0:00 1:00 S
95 #
96 # From Hernan G. Otero (1995-06-26):
97 # These corrections were contributed by InterSoft Argentina S.A.,
98 # obtaining the data from the:
99 # Talleres de Hidrografía Naval Argentina
100 # (Argentine Naval Hydrography Institute)
101 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
102 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
103 #
104 # From Hernan G. Otero (1995-06-26):
105 # From this moment on, the law that mandated the daylight saving
106 # time corrections was derogated and no more modifications
107 # to the time zones (for daylight saving) are now made.
108 #
109 # From Rives McDow (2000-01-10):
110 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
111 # which did not result in the switch of a time zone, as they stayed 9 hours
112 # from the International Date Line.
113 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
114 # From Paul Eggert (2007-12-28):
115 # DST was set to expire on March 5, not March 3, but since it was converted
116 # to standard time on March 3 it's more convenient for us to pretend that
117 # it ended on March 3.
118 Rule Arg 2000 only - Mar 3 0:00 0 -
119 #
120 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
121 # We just checked with our São Paulo office and they say the government of
122 # Argentina decided not to become one of the countries that go on or off DST.
123 # So Buenos Aires should be -3 hours from GMT at all times.
124 #
125 # From Fabián L. Arce Jofré (2000-04-04):
126 # The law that claimed DST for Argentina was derogated by President Fernando
127 # de la Rúa on March 2, 2000, because it would make people spend more energy
128 # in the winter time, rather than less. The change took effect on March 3.
129 #
130 # From Mariano Absatz (2001-06-06):
131 # one of the major newspapers here in Argentina said that the 1999
132 # Timezone Law (which never was effectively applied) will (would?) be
133 # in effect.... The article is at
196 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
197 #
198 # Press release 235 dated Saturday October 18th, from the Government of the
199 # Province of Jujuy saying it will not apply DST either (even when it was not
200 # included in Decree 1705/2008).
201 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
202
203 # From fullinet (2009-10-18):
204 # As announced in
205 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
206 # (an official .gob.ar) under title: "Sin Cambio de Hora"
207 # (English: "No hour change").
208 #
209 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
210 # oficial, decisión que estaba en estudio para su implementación el
211 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
212 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
213 # la modificación del huso horario, ya que 2009 nos encuentra con
214 # crecimiento en la producción y distribución energética."
215
216 Rule Arg 2007 only - Dec 30 0:00 1:00 S
217 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
218 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S
219
220 # From Mariano Absatz (2004-05-21):
221 # Today it was officially published that the Province of Mendoza is changing
222 # its timezone this winter... starting tomorrow night....
223 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
224 # From Paul Eggert (2004-05-24):
225 # It's Law No. 7,210. This change is due to a public power emergency, so for
226 # now we'll assume it's for this year only.
227 #
228 # From Paul Eggert (2014-08-09):
229 # Hora de verano para la República Argentina
230 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
231 # says that standard time in Argentina from 1894-10-31
232 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
233 # over Shanks & Pottenger.
234 #
235 # From Mariano Absatz (2004-06-05):
236 # These media articles from a major newspaper mostly cover the current state:
237 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
238 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
239 #
240 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
241 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
242 # Apparently, all nine provinces would go back to UTC-03:00 at the same
243 # time in October 17th.
244 #
245 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
246 # Tierra del Fuego, Tucumán.
247 #
248 # From Mariano Absatz (2004-06-14):
249 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
250 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
251 # annoyance with the change is much higher than the power savings obtained....
252 #
253 # From Gwillim Law (2004-06-14):
387 # America/Argentina/San_Luis entries should change to use these...
388 # ...
389
390 # From Alexander Krivenyshev (2010-04-09):
391 # According to news reports from El Diario de la República Province San
392 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
393 # after April 11, 2010 - will continue to have same time as rest of
394 # Argentina (UTC-3) (no DST).
395 #
396 # Confirmaron la prórroga del huso horario de verano (Spanish)
397 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
398 # or (some English translation):
399 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
400
401 # From Mariano Absatz (2010-04-12):
402 # yes...I can confirm this...and given that San Luis keeps calling
403 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
404 # rules...San Luis is still using "Western ARgentina Time" and it got
405 # stuck on Summer daylight savings time even though the summer is over.
406
407 # From Paul Eggert (2013-09-05):
408 # Perhaps San Luis operates on the legal fiction that it is at -04
409 # with perpetual summer time, but ordinary usage typically seems to
410 # just say it's at -03; see, for example,
411 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
412 # We've documented similar situations as being plain changes to
413 # standard time, so let's do that here too. This does not change UTC
414 # offsets, only tm_isdst and the time zone abbreviations. One minor
415 # plus is that this silences a zic complaint that there's no POSIX TZ
416 # setting for time stamps past 2038.
417
418 # From Paul Eggert (2013-02-21):
419 # Milne says Córdoba time was -4:16:48.2. Round to the nearest second.
420
421 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
422 #
423 # Buenos Aires (BA), Capital Federal (CF),
424 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
425 -4:16:48 - CMT 1920 May # Córdoba Mean Time
426 -4:00 - -04 1930 Dec
427 -4:00 Arg -04/-03 1969 Oct 5
428 -3:00 Arg -03/-02 1999 Oct 3
429 -4:00 Arg -04/-03 2000 Mar 3
430 -3:00 Arg -03/-02
431 #
432 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
433 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
434 #
435 # Shanks & Pottenger also make the following claims, which we haven't verified:
436 # - Formosa switched to -3:00 on 1991-01-07.
437 # - Misiones switched to -3:00 on 1990-12-29.
438 # - Chaco switched to -3:00 on 1991-01-04.
439 # - Santiago del Estero switched to -4:00 on 1991-04-01,
440 # then to -3:00 on 1991-04-26.
535 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31
536 -4:16:48 - CMT 1920 May
537 -4:00 - -04 1930 Dec
538 -4:00 Arg -04/-03 1969 Oct 5
539 -3:00 Arg -03/-02 1990 Mar 4
540 -4:00 - -04 1990 Oct 15
541 -4:00 1:00 -03 1991 Mar 1
542 -4:00 - -04 1991 Oct 15
543 -4:00 1:00 -03 1992 Mar 1
544 -4:00 - -04 1992 Oct 18
545 -3:00 Arg -03/-02 1999 Oct 3
546 -4:00 Arg -04/-03 2000 Mar 3
547 -3:00 - -03 2004 May 23
548 -4:00 - -04 2004 Sep 26
549 -3:00 Arg -03/-02 2008 Oct 18
550 -3:00 - -03
551 #
552 # San Luis (SL)
553
554 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
555 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 S
556
557 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
558 -4:16:48 - CMT 1920 May
559 -4:00 - -04 1930 Dec
560 -4:00 Arg -04/-03 1969 Oct 5
561 -3:00 Arg -03/-02 1990
562 -3:00 1:00 -02 1990 Mar 14
563 -4:00 - -04 1990 Oct 15
564 -4:00 1:00 -03 1991 Mar 1
565 -4:00 - -04 1991 Jun 1
566 -3:00 - -03 1999 Oct 3
567 -4:00 1:00 -03 2000 Mar 3
568 -3:00 - -03 2004 May 31
569 -4:00 - -04 2004 Jul 25
570 -3:00 Arg -03/-02 2008 Jan 21
571 -4:00 SanLuis -04/-03 2009 Oct 11
572 -3:00 - -03
573 #
574 # Santa Cruz (SC)
575 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
777 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
778
779 # From Steffen Thorsen (2013-09-20):
780 # Tocantins in Brazil is very likely not to observe DST from October....
781 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
782 # We will keep this article updated when this is confirmed:
783 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
784
785 # From Steffen Thorsen (2013-10-17):
786 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
787 # Senator Jorge Viana announced that Acre will change time zone on November 10.
788 # He did not specify the time of the change, nor if western parts of Amazonas
789 # will change as well.
790 #
791 # From Paul Eggert (2013-10-17):
792 # For now, assume western Amazonas will change as well.
793
794 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
795 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
796 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
797 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
798 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
799 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
800 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
801 # revoked DST.
802 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
803 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
804 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
805 Rule Brazil 1950 only - Apr 16 1:00 0 -
806 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
807 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
808 Rule Brazil 1953 only - Mar 1 0:00 0 -
809 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
810 # revoked DST.
811 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
812 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
813 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
814 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
815 # extended the above decree to all of the national territory on 12-09.
816 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
817 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
818 # extended summer time by one day to 1964-03-01 00:00 (start of school).
819 Rule Brazil 1964 only - Mar 1 0:00 0 -
820 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
821 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
822 Rule Brazil 1965 only - Mar 31 0:00 0 -
823 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
824 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
825 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
826 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
827 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
828 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
829 # revoked DST.
830 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
831 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
832 # Decree 92,310 (1986-01-21)
833 # Decree 92,463 (1986-03-13)
834 Rule Brazil 1986 only - Mar 15 0:00 0 -
835 # Decree 93,316 (1986-10-01)
836 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
837 Rule Brazil 1987 only - Feb 14 0:00 0 -
838 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
839 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
840 Rule Brazil 1988 only - Feb 7 0:00 0 -
841 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
842 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
843 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
844 Rule Brazil 1989 only - Jan 29 0:00 0 -
845 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
846 # with the same exceptions
847 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
848 Rule Brazil 1990 only - Feb 11 0:00 0 -
849 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
850 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
851 # Decree 99,629 (1990-10-19) adds BA, MT.
852 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
853 Rule Brazil 1991 only - Feb 17 0:00 0 -
854 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
855 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
856 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
857 Rule Brazil 1992 only - Feb 9 0:00 0 -
858 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
859 # adopted by same states.
860 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
861 Rule Brazil 1993 only - Jan 31 0:00 0 -
862 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
863 # adopted by same states, plus AM.
864 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
865 # web page corrected 2004-01-07) adopted by same states, minus AM.
866 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
867 # adopted by same states, plus MT and TO.
868 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
869 # adds AL, SE.
870 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
871 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
872 Rule Brazil 1996 only - Feb 11 0:00 0 -
873 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
874 # adopted by same states, minus AL, SE.
875 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
876 Rule Brazil 1997 only - Feb 16 0:00 0 -
877 # From Daniel C. Sobral (1998-02-12):
878 # In 1997, the DS began on October 6. The stated reason was that
879 # because international television networks ignored Brazil's policy on DS,
880 # they bought the wrong times on satellite for coverage of Pope's visit.
881 # This year, the ending date of DS was postponed to March 1
882 # to help dealing with the shortages of electric power.
883 #
884 # Decree 2,317 (1997-09-04), adopted by same states.
885 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
886 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
887 # (1998-02-10)
888 Rule Brazil 1998 only - Mar 1 0:00 0 -
889 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
890 # adopted by the same states as before.
891 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
892 Rule Brazil 1999 only - Feb 21 0:00 0 -
893 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
894 # (1999-08-23) adopted by same states.
895 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
896 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
897 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
898 Rule Brazil 2000 only - Feb 27 0:00 0 -
899 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
900 # adopted by the same states as before.
901 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
902 # repeals DST in PE and RR, effective 2000-10-15 00:00.
903 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
904 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
905 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
906 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
907 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
908 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
909 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
910 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
911 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
912 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
913 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
914 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
915 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
916 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
917 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
918 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
919 # adopted by the same states as before.
920 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
921 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
922 # adopted by the same states as before.
923 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
924 Rule Brazil 2007 only - Feb 25 0:00 0 -
925 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
926 # adopted by the same states as before.
927 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
928 # From Frederico A. C. Neves (2008-09-10):
929 # According to this decree
930 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
931 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
932 # 3rd Feb Sunday. There is an exception on the return date when this is
933 # the Carnival Sunday then the return date will be the next Sunday...
934 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
935 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
936 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
937 # added Bahia.
938 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
939 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
940 # removed Bahia and added Tocantins.
941 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
942 # removed Tocantins.
943 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
944 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
945 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
946 # From Steffen Thorsen (2017-12-18):
947 # According to many media sources, next year's DST start in Brazil will move to
948 # the first Sunday of November, and it will stay like that for the years after.
949 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
950 # From Steffen Thorsen (2017-12-20):
951 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
952 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
953 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
954 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
955 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
956 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
957 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
958 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
959 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
960 # From Arthur David Olson (2008-09-29):
961 # The next is wrong in some years but is better than nothing.
962 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
963
964 # The latest ruleset listed above says that the following states observe DST:
965 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
966
967 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
968 #
969 # Fernando de Noronha (administratively part of PE)
970 Zone America/Noronha -2:09:40 - LMT 1914
971 -2:00 Brazil -02/-01 1990 Sep 17
972 -2:00 - -02 1999 Sep 30
1239 #
1240 # From Paul Eggert (2016-03-18):
1241 # For now, assume the pattern holds for the indefinite future.
1242 # The decree says transitions occur at 24:00; in practice this appears
1243 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1244 # Island is always two hours behind the mainland.
1245
1246 # From Juan Correa (2016-12-04):
1247 # Magallanes region ... will keep DST (UTC -3) all year round....
1248 # 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
1249 #
1250 # From Deborah Goldsmith (2017-01-19):
1251 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1252 # From Paul Eggert (2017-01-19):
1253 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1254 # so in theory, they will revert to -04/-03 after that, which means
1255 # they will switch from -03 to -04 one hour after Santiago does that day.
1256 # For now, assume that they will not revert.
1257
1258 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1259 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
1260 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1261 Rule Chile 1968 only - Nov 3 4:00u 1:00 S
1262 Rule Chile 1969 only - Mar 30 3:00u 0 -
1263 Rule Chile 1969 only - Nov 23 4:00u 1:00 S
1264 Rule Chile 1970 only - Mar 29 3:00u 0 -
1265 Rule Chile 1971 only - Mar 14 3:00u 0 -
1266 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S
1267 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1268 Rule Chile 1973 only - Sep 30 4:00u 1:00 S
1269 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
1270 Rule Chile 1987 only - Apr 12 3:00u 0 -
1271 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1272 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
1273 Rule Chile 1990 only - Sep 16 4:00u 1:00 S
1274 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1275 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
1276 Rule Chile 1997 only - Mar 30 3:00u 0 -
1277 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1278 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
1279 Rule Chile 1999 only - Apr 4 3:00u 0 -
1280 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 S
1281 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1282 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1283 # which is used below in specifying the transition.
1284 Rule Chile 2008 only - Mar 30 3:00u 0 -
1285 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1286 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1287 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1288 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 S
1289 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1290 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
1291 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1292 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S
1293 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1294 # (1996-09) says 1998-03-08. Ignore these.
1295 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1296 Zone America/Santiago -4:42:46 - LMT 1890
1297 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1298 -5:00 - -05 1916 Jul 1
1299 -4:42:46 - SMT 1918 Sep 10
1300 -4:00 - -04 1919 Jul 1
1301 -4:42:46 - SMT 1927 Sep 1
1302 -5:00 Chile -05/-04 1932 Sep 1
1303 -4:00 - -04 1942 Jun 1
1304 -5:00 - -05 1942 Aug 1
1305 -4:00 - -04 1946 Jul 15
1306 -4:00 1:00 -03 1946 Sep 1 # central Chile
1307 -4:00 - -04 1947 Apr 1
1308 -5:00 - -05 1947 May 21 23:00
1309 -4:00 Chile -04/-03
1310 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1311 -4:42:46 - SMT 1910 Jan 10
1312 -5:00 - -05 1916 Jul 1
1337 # From Ethan Dicks (1996-10-06):
1338 # It keeps the same time as Punta Arenas, Chile, because, just like us
1339 # and the South Pole, that's the other end of their supply line....
1340 # I verified with someone who was there that since 1980,
1341 # Palmer has followed Chile. Prior to that, before the Falklands War,
1342 # Palmer used to be supplied from Argentina.
1343 #
1344 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1345 Zone Antarctica/Palmer 0 - -00 1965
1346 -4:00 Arg -04/-03 1969 Oct 5
1347 -3:00 Arg -03/-02 1982 May
1348 -4:00 Chile -04/-03 2016 Dec 4
1349 -3:00 - -03
1350
1351 # Colombia
1352
1353 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1354 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1355
1356 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1357 Rule CO 1992 only - May 3 0:00 1:00 S
1358 Rule CO 1993 only - Apr 4 0:00 0 -
1359 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1360 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1361 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1362 -5:00 CO -05/-04
1363 # Malpelo, Providencia, San Andres
1364 # no information; probably like America/Bogota
1365
1366 # Curaçao
1367
1368 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1369 #
1370 # From Paul Eggert (2006-03-22):
1371 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1372 # -4:00 since standard time was introduced on 1912-03-02; and that
1373 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1374 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1375 # Saba Island has been like Curaçao.
1376 # This all predates our 1970 cutoff, though.
1377 #
1397 # Ecuador
1398 #
1399 # Milne says the Central and South American Telegraph Company used -5:24:15.
1400 #
1401 # From Alois Treindl (2016-12-15):
1402 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1403 # ... Whether the law applied also to Galápagos, I do not know.
1404 # From Paul Eggert (2016-12-15):
1405 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1406 # This says President Sixto Durán Ballén signed decree No. 285, which
1407 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1408 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1409 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1410 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1411 # sol" ("It was dawning in the middle of the night, the buses went to class
1412 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1413 # (Not one step back), the clocks went back in 1993 and the experiment was not
1414 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1415 #
1416 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1417 Rule Ecuador 1992 only - Nov 28 0:00 1:00 S
1418 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1419 #
1420 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1421 Zone America/Guayaquil -5:19:20 - LMT 1890
1422 -5:14:00 - QMT 1931 # Quito Mean Time
1423 -5:00 Ecuador -05/-04
1424 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1425 -5:00 - -05 1986
1426 -6:00 Ecuador -06/-05
1427
1428 # Falklands
1429
1430 # From Paul Eggert (2006-03-22):
1431 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1432 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1433
1434 # From Falkland Islands Government Office, London (2001-01-22)
1435 # via Jesper Nørgaard:
1436 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1437 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1487 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1488 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1489 # hours) on the first Sunday of September at 0200hrs.
1490 #
1491 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1492 # will not revert to local mean time, but clocks will remain on Summer
1493 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1494 # change to local time following the trial period will be notified.
1495 #
1496 # From Andrew Newman (2012-02-24)
1497 # A letter from Justin McPhee, Chief Executive,
1498 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1499 # states...
1500 # The current Atlantic/Stanley entry under South America expects the
1501 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1502 # The database entry states that in 2011 Stanley was staying on fixed
1503 # summer time on a trial basis only. FIG need to contact IANA and/or
1504 # the maintainers of the database to inform them we're adopting
1505 # the same policy this year and suggest recommendations for future years.
1506 #
1507 # For now we will assume permanent summer time for the Falklands
1508 # until advised differently (to apply for 2012 and beyond, after the 2011
1509 # experiment was apparently successful.)
1510 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1511 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
1512 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1513 Rule Falk 1939 only - Oct 1 0:00 1:00 S
1514 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
1515 Rule Falk 1943 only - Jan 1 0:00 0 -
1516 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
1517 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1518 Rule Falk 1984 only - Sep 16 0:00 1:00 S
1519 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
1520 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1521 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1522 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 S
1523 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1524 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1525 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1526 -4:00 Falk -04/-03 1983 May
1527 -3:00 Falk -03/-02 1985 Sep 15
1528 -4:00 Falk -04/-03 2010 Sep 5 2:00
1529 -3:00 - -03
1530
1531 # French Guiana
1532 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1533 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1534 -4:00 - -04 1967 Oct
1535 -3:00 - -03
1536
1537 # Guyana
1538 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1539 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1540 -3:45 - -0345 1975 Jul 31
1541 -3:00 - -03 1991
1542 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1543 -4:00 - -04
1544
1545 # Paraguay
1546 #
1547 # From Paul Eggert (2006-03-22):
1548 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1549 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1550 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1551 #
1552 # From Waldemar Villamayor-Venialbo (2013-09-20):
1553 # No time of the day is established for the adjustment, so people normally
1554 # adjust their clocks at 0 hour of the given dates.
1555 #
1556 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1557 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
1558 Rule Para 1975 1978 - Mar 1 0:00 0 -
1559 Rule Para 1979 1991 - Apr 1 0:00 0 -
1560 Rule Para 1989 only - Oct 22 0:00 1:00 S
1561 Rule Para 1990 only - Oct 1 0:00 1:00 S
1562 Rule Para 1991 only - Oct 6 0:00 1:00 S
1563 Rule Para 1992 only - Mar 1 0:00 0 -
1564 Rule Para 1992 only - Oct 5 0:00 1:00 S
1565 Rule Para 1993 only - Mar 31 0:00 0 -
1566 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
1567 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1568 Rule Para 1996 only - Mar 1 0:00 0 -
1569 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1570 # From Steffen Thorsen (2000-10-02):
1571 # I have three independent reports that Paraguay changed to DST this Sunday
1572 # (10-01).
1573 #
1574 # Translated by Gwillim Law (2001-02-27) from
1575 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1576 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1577 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1578 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1579 # system has been operating for several years. Formerly there was a separate
1580 # decree each year; the new law has the same effect, but permanently. Every
1581 # year, the time will change on the first Sunday of October; likewise, the
1582 # clock will be set back on the first Sunday of March.
1583 #
1584 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
1585 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1586 Rule Para 1997 only - Feb lastSun 0:00 0 -
1587 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1588 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1589 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1590 # From Rives McDow (2002-02-28):
1591 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1592 # dst method to be from the first Sunday in September to the first Sunday in
1593 # April.
1594 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1595 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S
1596 #
1597 # From Jesper Nørgaard Welen (2005-01-02):
1598 # There are several sources that claim that Paraguay made
1599 # a timezone rule change in autumn 2004.
1600 # From Steffen Thorsen (2005-01-05):
1601 # Decree 1,867 (2004-03-05)
1602 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1603 # http://www.presidencia.gov.py/decretos/D1867.pdf
1604 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 S
1605 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1606 # From Carlos Raúl Perasso (2010-02-18):
1607 # By decree number 3958 issued yesterday
1608 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1609 # Paraguay changes its DST schedule, postponing the March rule to April and
1610 # modifying the October date. The decree reads:
1611 # ...
1612 # Art. 1. It is hereby established that from the second Sunday of the month of
1613 # April of this year (2010), the official time is to be set back 60 minutes,
1614 # and that on the first Sunday of the month of October, it is to be set
1615 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1616 # ...
1617 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S
1618 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1619 #
1620 # From Steffen Thorsen (2013-03-07):
1621 # Paraguay will end DST on 2013-03-24 00:00....
1622 # http://www.ande.gov.py/interna.php?id=1075
1623 #
1624 # From Carlos Raúl Perasso (2013-03-15):
1625 # The change in Paraguay is now final. Decree number 10780
1626 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1627 # From Carlos Raúl Perasso (2014-02-28):
1628 # Decree 1264 can be found at:
1629 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1630 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1631
1632 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1633 Zone America/Asuncion -3:50:40 - LMT 1890
1634 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1635 -4:00 - -04 1972 Oct
1636 -3:00 - -03 1974 Apr
1637 -4:00 Para -04/-03
1638
1639 # Peru
1640 #
1641 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1642 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1643 # When we were in Peru in 1985-1986, they apparently switched over
1644 # sometime between December 29 and January 3 while we were on the Amazon.
1645 #
1646 # From Paul Eggert (2006-03-22):
1647 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1648
1649 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1650 Rule Peru 1938 only - Jan 1 0:00 1:00 S
1651 Rule Peru 1938 only - Apr 1 0:00 0 -
1652 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
1653 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1654 Rule Peru 1986 1987 - Jan 1 0:00 1:00 S
1655 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1656 Rule Peru 1990 only - Jan 1 0:00 1:00 S
1657 Rule Peru 1990 only - Apr 1 0:00 0 -
1658 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1659 Rule Peru 1994 only - Jan 1 0:00 1:00 S
1660 Rule Peru 1994 only - Apr 1 0:00 0 -
1661 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1662 Zone America/Lima -5:08:12 - LMT 1890
1663 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1664 -5:00 Peru -05/-04
1665
1666 # South Georgia
1667 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1668 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1669 -2:00 - -02
1670
1671 # South Sandwich Is
1672 # uninhabited; scientific personnel have wintered
1673
1674 # Suriname
1675 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1676 Zone America/Paramaribo -3:40:40 - LMT 1911
1677 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1678 -3:40:36 - PMT 1945 Oct # The capital moved?
1679 -3:30 - -0330 1984 Oct
1685 -4:00 - AST
1686
1687 # These all agree with Trinidad and Tobago since 1970.
1688 Link America/Port_of_Spain America/Anguilla
1689 Link America/Port_of_Spain America/Antigua
1690 Link America/Port_of_Spain America/Dominica
1691 Link America/Port_of_Spain America/Grenada
1692 Link America/Port_of_Spain America/Guadeloupe
1693 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1694 Link America/Port_of_Spain America/Montserrat
1695 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1696 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1697 Link America/Port_of_Spain America/St_Lucia
1698 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1699 Link America/Port_of_Spain America/St_Vincent
1700 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1701
1702 # Uruguay
1703 # From Paul Eggert (1993-11-18):
1704 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1705 # From Shanks & Pottenger:
1706 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1707 # Whitman gives 1923 Oct 1; go with Shanks & Pottenger.
1708 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
1709 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1710 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
1711 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
1712 # Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman.
1713 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
1714 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
1715 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
1716 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
1717 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
1718 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
1719 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
1720 Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS
1721 Rule Uruguay 1942 only - Jan 1 0:00 0 -
1722 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
1723 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1724 Rule Uruguay 1959 only - May 24 0:00 1:00 S
1725 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1726 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
1727 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1728 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
1729 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1730 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
1731 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
1732 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
1733 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
1734 Rule Uruguay 1972 only - Aug 15 0:00 0 -
1735 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
1736 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
1737 Rule Uruguay 1976 only - Oct 1 0:00 0 -
1738 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
1739 Rule Uruguay 1978 only - Apr 1 0:00 0 -
1740 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
1741 Rule Uruguay 1980 only - May 1 0:00 0 -
1742 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
1743 Rule Uruguay 1988 only - Mar 14 0:00 0 -
1744 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
1745 Rule Uruguay 1989 only - Mar 12 0:00 0 -
1746 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
1747 # Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2,
1748 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
1749 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
1750 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
1751 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
1752 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1753 # From Eduardo Cota (2004-09-20):
1754 # The Uruguayan government has decreed a change in the local time....
1755 # http://www.presidencia.gub.uy/decretos/2004091502.htm
1756 Rule Uruguay 2004 only - Sep 19 0:00 1:00 S
1757 # From Steffen Thorsen (2005-03-11):
1758 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1759 # save energy ... it was postponed two weeks....
1760 # http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm
1761 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1762 # From Eduardo Cota (2005-09-27):
1763 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
1764 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
1765 # 02:00 local time, official time in Uruguay will be at GMT -2.
1766 Rule Uruguay 2005 only - Oct 9 2:00 1:00 S
1767 Rule Uruguay 2006 only - Mar 12 2:00 0 -
1768 # From Jesper Nørgaard Welen (2006-09-06):
1769 # http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF
1770 #
1771 # From Steffen Thorsen (2015-06-30):
1772 # ... it looks like they will not be using DST the coming summer:
1773 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1774 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1775 # From Paul Eggert (2015-06-30):
1776 # Apparently restaurateurs complained that DST caused people to go to the beach
1777 # instead of out to dinner.
1778 # From Pablo Camargo (2015-07-13):
1779 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1780 # [dated 2015-06-29; repeals Decree 311/006 dated 2006-09-04]
1781 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 S
1782 Rule Uruguay 2007 2015 - Mar Sun>=8 2:00 0 -
1783
1784 # This Zone can be simplified once we assume zic %z.
1785 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
1786 -3:44:44 - MMT 1920 May 1 # Montevideo MT
1787 -3:30 Uruguay -0330/-03 1942 Dec 14
1788 -3:00 Uruguay -03/-02 1968
1789 -3:00 Uruguay -03/-0230 1971
1790 -3:00 Uruguay -03/-02 1974
1791 -3:00 Uruguay -03/-0230 1974 Dec 22
1792 -3:00 Uruguay -03/-02
1793
1794 # Venezuela
1795 #
1796 # From Paul Eggert (2015-07-28):
1797 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1798 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1799 #
1800 # From John Stainforth (2007-11-28):
1801 # ... the change for Venezuela originally expected for 2007-12-31 has
1802 # been brought forward to 2007-12-09. The official announcement was
1803 # published today in the "Gaceta Oficial de la República Bolivariana
1804 # de Venezuela, número 38.819" (official document for all laws or
1805 # resolution publication)
1806 # http://www.globovision.com/news.php?nid=72208
1807
1808 # From Alexander Krivenyshev (2016-04-15):
1809 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1810 #
|
53 # invented and did not reflect common practice.
54
55 ###############################################################################
56
57 ###############################################################################
58
59 # Argentina
60
61 # From Bob Devine (1988-01-28):
62 # Argentina: first Sunday in October to first Sunday in April since 1976.
63 # Double Summer time from 1969 to 1974. Switches at midnight.
64
65 # From U. S. Naval Observatory (1988-01-19):
66 # ARGENTINA 3 H BEHIND UTC
67
68 # From Hernan G. Otero (1995-06-26):
69 # I am sending modifications to the Argentine time zone table...
70 # AR was chosen because they are the ISO letters that represent Argentina.
71
72 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
73 Rule Arg 1930 only - Dec 1 0:00 1:00 -
74 Rule Arg 1931 only - Apr 1 0:00 0 -
75 Rule Arg 1931 only - Oct 15 0:00 1:00 -
76 Rule Arg 1932 1940 - Mar 1 0:00 0 -
77 Rule Arg 1932 1939 - Nov 1 0:00 1:00 -
78 Rule Arg 1940 only - Jul 1 0:00 1:00 -
79 Rule Arg 1941 only - Jun 15 0:00 0 -
80 Rule Arg 1941 only - Oct 15 0:00 1:00 -
81 Rule Arg 1943 only - Aug 1 0:00 0 -
82 Rule Arg 1943 only - Oct 15 0:00 1:00 -
83 Rule Arg 1946 only - Mar 1 0:00 0 -
84 Rule Arg 1946 only - Oct 1 0:00 1:00 -
85 Rule Arg 1963 only - Oct 1 0:00 0 -
86 Rule Arg 1963 only - Dec 15 0:00 1:00 -
87 Rule Arg 1964 1966 - Mar 1 0:00 0 -
88 Rule Arg 1964 1966 - Oct 15 0:00 1:00 -
89 Rule Arg 1967 only - Apr 2 0:00 0 -
90 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 -
91 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 -
92 Rule Arg 1974 only - Jan 23 0:00 1:00 -
93 Rule Arg 1974 only - May 1 0:00 0 -
94 Rule Arg 1988 only - Dec 1 0:00 1:00 -
95 #
96 # From Hernan G. Otero (1995-06-26):
97 # These corrections were contributed by InterSoft Argentina S.A.,
98 # obtaining the data from the:
99 # Talleres de Hidrografía Naval Argentina
100 # (Argentine Naval Hydrography Institute)
101 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
102 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 -
103 #
104 # From Hernan G. Otero (1995-06-26):
105 # From this moment on, the law that mandated the daylight saving
106 # time corrections was derogated and no more modifications
107 # to the time zones (for daylight saving) are now made.
108 #
109 # From Rives McDow (2000-01-10):
110 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
111 # which did not result in the switch of a time zone, as they stayed 9 hours
112 # from the International Date Line.
113 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 -
114 # From Paul Eggert (2007-12-28):
115 # DST was set to expire on March 5, not March 3, but since it was converted
116 # to standard time on March 3 it's more convenient for us to pretend that
117 # it ended on March 3.
118 Rule Arg 2000 only - Mar 3 0:00 0 -
119 #
120 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
121 # We just checked with our São Paulo office and they say the government of
122 # Argentina decided not to become one of the countries that go on or off DST.
123 # So Buenos Aires should be -3 hours from GMT at all times.
124 #
125 # From Fabián L. Arce Jofré (2000-04-04):
126 # The law that claimed DST for Argentina was derogated by President Fernando
127 # de la Rúa on March 2, 2000, because it would make people spend more energy
128 # in the winter time, rather than less. The change took effect on March 3.
129 #
130 # From Mariano Absatz (2001-06-06):
131 # one of the major newspapers here in Argentina said that the 1999
132 # Timezone Law (which never was effectively applied) will (would?) be
133 # in effect.... The article is at
196 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
197 #
198 # Press release 235 dated Saturday October 18th, from the Government of the
199 # Province of Jujuy saying it will not apply DST either (even when it was not
200 # included in Decree 1705/2008).
201 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
202
203 # From fullinet (2009-10-18):
204 # As announced in
205 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
206 # (an official .gob.ar) under title: "Sin Cambio de Hora"
207 # (English: "No hour change").
208 #
209 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
210 # oficial, decisión que estaba en estudio para su implementación el
211 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
212 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
213 # la modificación del huso horario, ya que 2009 nos encuentra con
214 # crecimiento en la producción y distribución energética."
215
216 Rule Arg 2007 only - Dec 30 0:00 1:00 -
217 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 -
218 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 -
219
220 # From Mariano Absatz (2004-05-21):
221 # Today it was officially published that the Province of Mendoza is changing
222 # its timezone this winter... starting tomorrow night....
223 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
224 # From Paul Eggert (2004-05-24):
225 # It's Law No. 7,210. This change is due to a public power emergency, so for
226 # now we'll assume it's for this year only.
227 #
228 # From Paul Eggert (2018-01-31):
229 # Hora de verano para la República Argentina
230 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
231 # says that standard time in Argentina from 1894-10-31
232 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
233 # over Shanks & Pottenger. It is upward compatible with Milne, who
234 # says Córdoba time was -4:16:48.2.
235
236 #
237 # From Mariano Absatz (2004-06-05):
238 # These media articles from a major newspaper mostly cover the current state:
239 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
240 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
241 #
242 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
243 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
244 # Apparently, all nine provinces would go back to UTC-03:00 at the same
245 # time in October 17th.
246 #
247 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
248 # Tierra del Fuego, Tucumán.
249 #
250 # From Mariano Absatz (2004-06-14):
251 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
252 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
253 # annoyance with the change is much higher than the power savings obtained....
254 #
255 # From Gwillim Law (2004-06-14):
389 # America/Argentina/San_Luis entries should change to use these...
390 # ...
391
392 # From Alexander Krivenyshev (2010-04-09):
393 # According to news reports from El Diario de la República Province San
394 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
395 # after April 11, 2010 - will continue to have same time as rest of
396 # Argentina (UTC-3) (no DST).
397 #
398 # Confirmaron la prórroga del huso horario de verano (Spanish)
399 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
400 # or (some English translation):
401 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
402
403 # From Mariano Absatz (2010-04-12):
404 # yes...I can confirm this...and given that San Luis keeps calling
405 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
406 # rules...San Luis is still using "Western ARgentina Time" and it got
407 # stuck on Summer daylight savings time even though the summer is over.
408
409 # From Paul Eggert (2018-01-23):
410 # Perhaps San Luis operates on the legal fiction that it is at -04
411 # with perpetual daylight saving time, but ordinary usage typically seems to
412 # just say it's at -03; see, for example,
413 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
414 # We've documented similar situations as being plain changes to
415 # standard time, so let's do that here too. This does not change UTC
416 # offsets, only tm_isdst and the time zone abbreviations. One minor
417 # plus is that this silences a zic complaint that there's no POSIX TZ
418 # setting for time stamps past 2038.
419
420 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
421 #
422 # Buenos Aires (BA), Capital Federal (CF),
423 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
424 -4:16:48 - CMT 1920 May # Córdoba Mean Time
425 -4:00 - -04 1930 Dec
426 -4:00 Arg -04/-03 1969 Oct 5
427 -3:00 Arg -03/-02 1999 Oct 3
428 -4:00 Arg -04/-03 2000 Mar 3
429 -3:00 Arg -03/-02
430 #
431 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
432 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
433 #
434 # Shanks & Pottenger also make the following claims, which we haven't verified:
435 # - Formosa switched to -3:00 on 1991-01-07.
436 # - Misiones switched to -3:00 on 1990-12-29.
437 # - Chaco switched to -3:00 on 1991-01-04.
438 # - Santiago del Estero switched to -4:00 on 1991-04-01,
439 # then to -3:00 on 1991-04-26.
534 Zone America/Argentina/Mendoza -4:35:16 - 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 Mar 4
539 -4:00 - -04 1990 Oct 15
540 -4:00 1:00 -03 1991 Mar 1
541 -4:00 - -04 1991 Oct 15
542 -4:00 1:00 -03 1992 Mar 1
543 -4:00 - -04 1992 Oct 18
544 -3:00 Arg -03/-02 1999 Oct 3
545 -4:00 Arg -04/-03 2000 Mar 3
546 -3:00 - -03 2004 May 23
547 -4:00 - -04 2004 Sep 26
548 -3:00 Arg -03/-02 2008 Oct 18
549 -3:00 - -03
550 #
551 # San Luis (SL)
552
553 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 -
554 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 -
555
556 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31
557 -4:16:48 - CMT 1920 May
558 -4:00 - -04 1930 Dec
559 -4:00 Arg -04/-03 1969 Oct 5
560 -3:00 Arg -03/-02 1990
561 -3:00 1:00 -02 1990 Mar 14
562 -4:00 - -04 1990 Oct 15
563 -4:00 1:00 -03 1991 Mar 1
564 -4:00 - -04 1991 Jun 1
565 -3:00 - -03 1999 Oct 3
566 -4:00 1:00 -03 2000 Mar 3
567 -3:00 - -03 2004 May 31
568 -4:00 - -04 2004 Jul 25
569 -3:00 Arg -03/-02 2008 Jan 21
570 -4:00 SanLuis -04/-03 2009 Oct 11
571 -3:00 - -03
572 #
573 # Santa Cruz (SC)
574 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31
776 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
777
778 # From Steffen Thorsen (2013-09-20):
779 # Tocantins in Brazil is very likely not to observe DST from October....
780 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
781 # We will keep this article updated when this is confirmed:
782 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
783
784 # From Steffen Thorsen (2013-10-17):
785 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
786 # Senator Jorge Viana announced that Acre will change time zone on November 10.
787 # He did not specify the time of the change, nor if western parts of Amazonas
788 # will change as well.
789 #
790 # From Paul Eggert (2013-10-17):
791 # For now, assume western Amazonas will change as well.
792
793 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
794 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01)
795 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10)
796 Rule Brazil 1931 only - Oct 3 11:00 1:00 -
797 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
798 Rule Brazil 1932 only - Oct 3 0:00 1:00 -
799 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10)
800 # revoked DST.
801 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24)
802 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13)
803 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 -
804 Rule Brazil 1950 only - Apr 16 1:00 0 -
805 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
806 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24)
807 Rule Brazil 1953 only - Mar 1 0:00 0 -
808 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30)
809 # revoked DST.
810 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18)
811 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
812 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
813 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03)
814 # extended the above decree to all of the national territory on 12-09.
815 Rule Brazil 1963 only - Dec 9 0:00 1:00 -
816 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25)
817 # extended summer time by one day to 1964-03-01 00:00 (start of school).
818 Rule Brazil 1964 only - Mar 1 0:00 0 -
819 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27)
820 Rule Brazil 1965 only - Jan 31 0:00 1:00 -
821 Rule Brazil 1965 only - Mar 31 0:00 0 -
822 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22)
823 Rule Brazil 1965 only - Dec 1 0:00 1:00 -
824 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18)
825 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
826 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 -
827 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15)
828 # revoked DST.
829 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27)
830 Rule Brazil 1985 only - Nov 2 0:00 1:00 -
831 # Decree 92,310 (1986-01-21)
832 # Decree 92,463 (1986-03-13)
833 Rule Brazil 1986 only - Mar 15 0:00 0 -
834 # Decree 93,316 (1986-10-01)
835 Rule Brazil 1986 only - Oct 25 0:00 1:00 -
836 Rule Brazil 1987 only - Feb 14 0:00 0 -
837 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22)
838 Rule Brazil 1987 only - Oct 25 0:00 1:00 -
839 Rule Brazil 1988 only - Feb 7 0:00 0 -
840 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12)
841 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
842 Rule Brazil 1988 only - Oct 16 0:00 1:00 -
843 Rule Brazil 1989 only - Jan 29 0:00 0 -
844 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21)
845 # with the same exceptions
846 Rule Brazil 1989 only - Oct 15 0:00 1:00 -
847 Rule Brazil 1990 only - Feb 11 0:00 0 -
848 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17)
849 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
850 # Decree 99,629 (1990-10-19) adds BA, MT.
851 Rule Brazil 1990 only - Oct 21 0:00 1:00 -
852 Rule Brazil 1991 only - Feb 17 0:00 0 -
853 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25)
854 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
855 Rule Brazil 1991 only - Oct 20 0:00 1:00 -
856 Rule Brazil 1992 only - Feb 9 0:00 0 -
857 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16)
858 # adopted by same states.
859 Rule Brazil 1992 only - Oct 25 0:00 1:00 -
860 Rule Brazil 1993 only - Jan 31 0:00 0 -
861 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28)
862 # adopted by same states, plus AM.
863 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22;
864 # web page corrected 2004-01-07) adopted by same states, minus AM.
865 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14)
866 # adopted by same states, plus MT and TO.
867 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13)
868 # adds AL, SE.
869 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 -
870 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
871 Rule Brazil 1996 only - Feb 11 0:00 0 -
872 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04)
873 # adopted by same states, minus AL, SE.
874 Rule Brazil 1996 only - Oct 6 0:00 1:00 -
875 Rule Brazil 1997 only - Feb 16 0:00 0 -
876 # From Daniel C. Sobral (1998-02-12):
877 # In 1997, the DS began on October 6. The stated reason was that
878 # because international television networks ignored Brazil's policy on DS,
879 # they bought the wrong times on satellite for coverage of Pope's visit.
880 # This year, the ending date of DS was postponed to March 1
881 # to help dealing with the shortages of electric power.
882 #
883 # Decree 2,317 (1997-09-04), adopted by same states.
884 Rule Brazil 1997 only - Oct 6 0:00 1:00 -
885 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG>
886 # (1998-02-10)
887 Rule Brazil 1998 only - Mar 1 0:00 0 -
888 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11)
889 # adopted by the same states as before.
890 Rule Brazil 1998 only - Oct 11 0:00 1:00 -
891 Rule Brazil 1999 only - Feb 21 0:00 0 -
892 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif>
893 # (1999-08-23) adopted by same states.
894 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30)
895 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
896 Rule Brazil 1999 only - Oct 3 0:00 1:00 -
897 Rule Brazil 2000 only - Feb 27 0:00 0 -
898 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06)
899 # adopted by the same states as before.
900 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13)
901 # repeals DST in PE and RR, effective 2000-10-15 00:00.
902 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17)
903 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
904 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif>
905 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
906 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 -
907 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 -
908 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
909 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm>
910 Rule Brazil 2002 only - Nov 3 0:00 1:00 -
911 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
912 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm>
913 Rule Brazil 2003 only - Oct 19 0:00 1:00 -
914 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
915 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
916 Rule Brazil 2004 only - Nov 2 0:00 1:00 -
917 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
918 # adopted by the same states as before.
919 Rule Brazil 2005 only - Oct 16 0:00 1:00 -
920 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
921 # adopted by the same states as before.
922 Rule Brazil 2006 only - Nov 5 0:00 1:00 -
923 Rule Brazil 2007 only - Feb 25 0:00 0 -
924 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
925 # adopted by the same states as before.
926 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 -
927 # From Frederico A. C. Neves (2008-09-10):
928 # According to this decree
929 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
930 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
931 # 3rd Feb Sunday. There is an exception on the return date when this is
932 # the Carnival Sunday then the return date will be the next Sunday...
933 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 -
934 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
935 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
936 # added Bahia.
937 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
938 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
939 # removed Bahia and added Tocantins.
940 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
941 # removed Tocantins.
942 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
943 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
944 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
945 # From Steffen Thorsen (2017-12-18):
946 # According to many media sources, next year's DST start in Brazil will move to
947 # the first Sunday of November, and it will stay like that for the years after.
948 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
949 # From Steffen Thorsen (2017-12-20):
950 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
951 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 -
952 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
953 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
954 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
955 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
956 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
957 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
958 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
959 # From Arthur David Olson (2008-09-29):
960 # The next is wrong in some years but is better than nothing.
961 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
962
963 # The latest ruleset listed above says that the following states observe DST:
964 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
965
966 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
967 #
968 # Fernando de Noronha (administratively part of PE)
969 Zone America/Noronha -2:09:40 - LMT 1914
970 -2:00 Brazil -02/-01 1990 Sep 17
971 -2:00 - -02 1999 Sep 30
1238 #
1239 # From Paul Eggert (2016-03-18):
1240 # For now, assume the pattern holds for the indefinite future.
1241 # The decree says transitions occur at 24:00; in practice this appears
1242 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
1243 # Island is always two hours behind the mainland.
1244
1245 # From Juan Correa (2016-12-04):
1246 # Magallanes region ... will keep DST (UTC -3) all year round....
1247 # 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
1248 #
1249 # From Deborah Goldsmith (2017-01-19):
1250 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
1251 # From Paul Eggert (2017-01-19):
1252 # The above says the Magallanes change expires 2019-05-11 at 24:00,
1253 # so in theory, they will revert to -04/-03 after that, which means
1254 # they will switch from -03 to -04 one hour after Santiago does that day.
1255 # For now, assume that they will not revert.
1256
1257 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1258 Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
1259 Rule Chile 1928 1932 - Apr 1 0:00 0 -
1260 Rule Chile 1968 only - Nov 3 4:00u 1:00 -
1261 Rule Chile 1969 only - Mar 30 3:00u 0 -
1262 Rule Chile 1969 only - Nov 23 4:00u 1:00 -
1263 Rule Chile 1970 only - Mar 29 3:00u 0 -
1264 Rule Chile 1971 only - Mar 14 3:00u 0 -
1265 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 -
1266 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
1267 Rule Chile 1973 only - Sep 30 4:00u 1:00 -
1268 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 -
1269 Rule Chile 1987 only - Apr 12 3:00u 0 -
1270 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
1271 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 -
1272 Rule Chile 1990 only - Sep 16 4:00u 1:00 -
1273 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
1274 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 -
1275 Rule Chile 1997 only - Mar 30 3:00u 0 -
1276 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 -
1277 Rule Chile 1998 only - Sep 27 4:00u 1:00 -
1278 Rule Chile 1999 only - Apr 4 3:00u 0 -
1279 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 -
1280 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 -
1281 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
1282 # which is used below in specifying the transition.
1283 Rule Chile 2008 only - Mar 30 3:00u 0 -
1284 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 -
1285 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 -
1286 Rule Chile 2011 only - May Sun>=2 3:00u 0 -
1287 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 -
1288 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
1289 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 -
1290 Rule Chile 2016 max - May Sun>=9 3:00u 0 -
1291 Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 -
1292 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
1293 # (1996-09) says 1998-03-08. Ignore these.
1294 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1295 Zone America/Santiago -4:42:46 - LMT 1890
1296 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
1297 -5:00 - -05 1916 Jul 1
1298 -4:42:46 - SMT 1918 Sep 10
1299 -4:00 - -04 1919 Jul 1
1300 -4:42:46 - SMT 1927 Sep 1
1301 -5:00 Chile -05/-04 1932 Sep 1
1302 -4:00 - -04 1942 Jun 1
1303 -5:00 - -05 1942 Aug 1
1304 -4:00 - -04 1946 Jul 15
1305 -4:00 1:00 -03 1946 Sep 1 # central Chile
1306 -4:00 - -04 1947 Apr 1
1307 -5:00 - -05 1947 May 21 23:00
1308 -4:00 Chile -04/-03
1309 Zone America/Punta_Arenas -4:43:40 - LMT 1890
1310 -4:42:46 - SMT 1910 Jan 10
1311 -5:00 - -05 1916 Jul 1
1336 # From Ethan Dicks (1996-10-06):
1337 # It keeps the same time as Punta Arenas, Chile, because, just like us
1338 # and the South Pole, that's the other end of their supply line....
1339 # I verified with someone who was there that since 1980,
1340 # Palmer has followed Chile. Prior to that, before the Falklands War,
1341 # Palmer used to be supplied from Argentina.
1342 #
1343 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1344 Zone Antarctica/Palmer 0 - -00 1965
1345 -4:00 Arg -04/-03 1969 Oct 5
1346 -3:00 Arg -03/-02 1982 May
1347 -4:00 Chile -04/-03 2016 Dec 4
1348 -3:00 - -03
1349
1350 # Colombia
1351
1352 # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes,
1353 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
1354
1355 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1356 Rule CO 1992 only - May 3 0:00 1:00 -
1357 Rule CO 1993 only - Apr 4 0:00 0 -
1358 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1359 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13
1360 -4:56:16 - BMT 1914 Nov 23 # Bogotá Mean Time
1361 -5:00 CO -05/-04
1362 # Malpelo, Providencia, San Andres
1363 # no information; probably like America/Bogota
1364
1365 # Curaçao
1366
1367 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
1368 #
1369 # From Paul Eggert (2006-03-22):
1370 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
1371 # -4:00 since standard time was introduced on 1912-03-02; and that
1372 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
1373 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say
1374 # Saba Island has been like Curaçao.
1375 # This all predates our 1970 cutoff, though.
1376 #
1396 # Ecuador
1397 #
1398 # Milne says the Central and South American Telegraph Company used -5:24:15.
1399 #
1400 # From Alois Treindl (2016-12-15):
1401 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
1402 # ... Whether the law applied also to Galápagos, I do not know.
1403 # From Paul Eggert (2016-12-15):
1404 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
1405 # This says President Sixto Durán Ballén signed decree No. 285, which
1406 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
1407 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did
1408 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
1409 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
1410 # sol" ("It was dawning in the middle of the night, the buses went to class
1411 # without sun"). Although Ballén's campaign slogan was "Ni un paso atrás"
1412 # (Not one step back), the clocks went back in 1993 and the experiment was not
1413 # repeated. For now, assume transitions were at 00:00 local time country-wide.
1414 #
1415 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1416 Rule Ecuador 1992 only - Nov 28 0:00 1:00 -
1417 Rule Ecuador 1993 only - Feb 5 0:00 0 -
1418 #
1419 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1420 Zone America/Guayaquil -5:19:20 - LMT 1890
1421 -5:14:00 - QMT 1931 # Quito Mean Time
1422 -5:00 Ecuador -05/-04
1423 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
1424 -5:00 - -05 1986
1425 -6:00 Ecuador -06/-05
1426
1427 # Falklands
1428
1429 # From Paul Eggert (2006-03-22):
1430 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
1431 # the IATA gives 1996-09-08. Go with Shanks & Pottenger.
1432
1433 # From Falkland Islands Government Office, London (2001-01-22)
1434 # via Jesper Nørgaard:
1435 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
1436 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
1486 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
1487 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
1488 # hours) on the first Sunday of September at 0200hrs.
1489 #
1490 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
1491 # will not revert to local mean time, but clocks will remain on Summer
1492 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term
1493 # change to local time following the trial period will be notified.
1494 #
1495 # From Andrew Newman (2012-02-24)
1496 # A letter from Justin McPhee, Chief Executive,
1497 # Cable & Wireless Falkland Islands (dated 2012-02-22)
1498 # states...
1499 # The current Atlantic/Stanley entry under South America expects the
1500 # clocks to go back to standard Falklands Time (FKT) on the 15th April.
1501 # The database entry states that in 2011 Stanley was staying on fixed
1502 # summer time on a trial basis only. FIG need to contact IANA and/or
1503 # the maintainers of the database to inform them we're adopting
1504 # the same policy this year and suggest recommendations for future years.
1505 #
1506 # For now we will assume permanent -03 for the Falklands
1507 # until advised differently (to apply for 2012 and beyond, after the 2011
1508 # experiment was apparently successful.)
1509 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1510 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 -
1511 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
1512 Rule Falk 1939 only - Oct 1 0:00 1:00 -
1513 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 -
1514 Rule Falk 1943 only - Jan 1 0:00 0 -
1515 Rule Falk 1983 only - Sep lastSun 0:00 1:00 -
1516 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
1517 Rule Falk 1984 only - Sep 16 0:00 1:00 -
1518 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 -
1519 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
1520 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 -
1521 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 -
1522 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1523 Zone Atlantic/Stanley -3:51:24 - LMT 1890
1524 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
1525 -4:00 Falk -04/-03 1983 May
1526 -3:00 Falk -03/-02 1985 Sep 15
1527 -4:00 Falk -04/-03 2010 Sep 5 2:00
1528 -3:00 - -03
1529
1530 # French Guiana
1531 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1532 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
1533 -4:00 - -04 1967 Oct
1534 -3:00 - -03
1535
1536 # Guyana
1537 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1538 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
1539 -3:45 - -0345 1975 Jul 31
1540 -3:00 - -03 1991
1541 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
1542 -4:00 - -04
1543
1544 # Paraguay
1545 #
1546 # From Paul Eggert (2006-03-22):
1547 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
1548 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999
1549 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
1550 #
1551 # From Waldemar Villamayor-Venialbo (2013-09-20):
1552 # No time of the day is established for the adjustment, so people normally
1553 # adjust their clocks at 0 hour of the given dates.
1554 #
1555 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1556 Rule Para 1975 1988 - Oct 1 0:00 1:00 -
1557 Rule Para 1975 1978 - Mar 1 0:00 0 -
1558 Rule Para 1979 1991 - Apr 1 0:00 0 -
1559 Rule Para 1989 only - Oct 22 0:00 1:00 -
1560 Rule Para 1990 only - Oct 1 0:00 1:00 -
1561 Rule Para 1991 only - Oct 6 0:00 1:00 -
1562 Rule Para 1992 only - Mar 1 0:00 0 -
1563 Rule Para 1992 only - Oct 5 0:00 1:00 -
1564 Rule Para 1993 only - Mar 31 0:00 0 -
1565 Rule Para 1993 1995 - Oct 1 0:00 1:00 -
1566 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
1567 Rule Para 1996 only - Mar 1 0:00 0 -
1568 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
1569 # From Steffen Thorsen (2000-10-02):
1570 # I have three independent reports that Paraguay changed to DST this Sunday
1571 # (10-01).
1572 #
1573 # Translated by Gwillim Law (2001-02-27) from
1574 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
1575 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
1576 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
1577 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
1578 # system has been operating for several years. Formerly there was a separate
1579 # decree each year; the new law has the same effect, but permanently. Every
1580 # year, the time will change on the first Sunday of October; likewise, the
1581 # clock will be set back on the first Sunday of March.
1582 #
1583 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 -
1584 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
1585 Rule Para 1997 only - Feb lastSun 0:00 0 -
1586 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
1587 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
1588 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
1589 # From Rives McDow (2002-02-28):
1590 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
1591 # dst method to be from the first Sunday in September to the first Sunday in
1592 # April.
1593 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 -
1594 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 -
1595 #
1596 # From Jesper Nørgaard Welen (2005-01-02):
1597 # There are several sources that claim that Paraguay made
1598 # a timezone rule change in autumn 2004.
1599 # From Steffen Thorsen (2005-01-05):
1600 # Decree 1,867 (2004-03-05)
1601 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
1602 # http://www.presidencia.gov.py/decretos/D1867.pdf
1603 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 -
1604 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 -
1605 # From Carlos Raúl Perasso (2010-02-18):
1606 # By decree number 3958 issued yesterday
1607 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
1608 # Paraguay changes its DST schedule, postponing the March rule to April and
1609 # modifying the October date. The decree reads:
1610 # ...
1611 # Art. 1. It is hereby established that from the second Sunday of the month of
1612 # April of this year (2010), the official time is to be set back 60 minutes,
1613 # and that on the first Sunday of the month of October, it is to be set
1614 # forward 60 minutes, in all the territory of the Paraguayan Republic.
1615 # ...
1616 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 -
1617 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 -
1618 #
1619 # From Steffen Thorsen (2013-03-07):
1620 # Paraguay will end DST on 2013-03-24 00:00....
1621 # http://www.ande.gov.py/interna.php?id=1075
1622 #
1623 # From Carlos Raúl Perasso (2013-03-15):
1624 # The change in Paraguay is now final. Decree number 10780
1625 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
1626 # From Carlos Raúl Perasso (2014-02-28):
1627 # Decree 1264 can be found at:
1628 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
1629 Rule Para 2013 max - Mar Sun>=22 0:00 0 -
1630
1631 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1632 Zone America/Asuncion -3:50:40 - LMT 1890
1633 -3:50:40 - AMT 1931 Oct 10 # Asunción Mean Time
1634 -4:00 - -04 1972 Oct
1635 -3:00 - -03 1974 Apr
1636 -4:00 Para -04/-03
1637
1638 # Peru
1639 #
1640 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
1641 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
1642 # When we were in Peru in 1985-1986, they apparently switched over
1643 # sometime between December 29 and January 3 while we were on the Amazon.
1644 #
1645 # From Paul Eggert (2006-03-22):
1646 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987.
1647
1648 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1649 Rule Peru 1938 only - Jan 1 0:00 1:00 -
1650 Rule Peru 1938 only - Apr 1 0:00 0 -
1651 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 -
1652 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
1653 Rule Peru 1986 1987 - Jan 1 0:00 1:00 -
1654 Rule Peru 1986 1987 - Apr 1 0:00 0 -
1655 Rule Peru 1990 only - Jan 1 0:00 1:00 -
1656 Rule Peru 1990 only - Apr 1 0:00 0 -
1657 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
1658 Rule Peru 1994 only - Jan 1 0:00 1:00 -
1659 Rule Peru 1994 only - Apr 1 0:00 0 -
1660 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1661 Zone America/Lima -5:08:12 - LMT 1890
1662 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
1663 -5:00 Peru -05/-04
1664
1665 # South Georgia
1666 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1667 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
1668 -2:00 - -02
1669
1670 # South Sandwich Is
1671 # uninhabited; scientific personnel have wintered
1672
1673 # Suriname
1674 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1675 Zone America/Paramaribo -3:40:40 - LMT 1911
1676 -3:40:52 - PMT 1935 # Paramaribo Mean Time
1677 -3:40:36 - PMT 1945 Oct # The capital moved?
1678 -3:30 - -0330 1984 Oct
1684 -4:00 - AST
1685
1686 # These all agree with Trinidad and Tobago since 1970.
1687 Link America/Port_of_Spain America/Anguilla
1688 Link America/Port_of_Spain America/Antigua
1689 Link America/Port_of_Spain America/Dominica
1690 Link America/Port_of_Spain America/Grenada
1691 Link America/Port_of_Spain America/Guadeloupe
1692 Link America/Port_of_Spain America/Marigot # St Martin (French part)
1693 Link America/Port_of_Spain America/Montserrat
1694 Link America/Port_of_Spain America/St_Barthelemy # St Barthélemy
1695 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis
1696 Link America/Port_of_Spain America/St_Lucia
1697 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US)
1698 Link America/Port_of_Spain America/St_Vincent
1699 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK)
1700
1701 # Uruguay
1702 # From Paul Eggert (1993-11-18):
1703 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
1704 #
1705 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael
1706 # Deckers (2018-02-20):
1707 # ... At least they kept good records...
1708 #
1709 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36
1710 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and
1711 # Meteorology Service of the Uruguayan Navy, seems to give many transitions
1712 # with greater clarity than we've had before. It directly references many laws
1713 # and decrees which are, in turn, referenced below. They can be viewed in the
1714 # public archives of the Diario Oficial (in Spanish) at
1715 # http://www.impo.com.uy/diariooficial/
1716 #
1717 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the
1718 # auspices of the National Institute for the Prediction of Time. It is unclear
1719 # exactly what offset was used during this period, though Ley No. 7200 of
1720 # 1920-04-23 used the Observatory of the National Meteorological Institute in
1721 # Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian,
1722 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00,
1723 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on
1724 # page 725 of the Proceedings of the Second Pan-American Scientific Congress,
1725 # 1915-1916) was in use, and merely became official from 1908-06-10.
1726 # https://www.impo.com.uy/diariooficial/1908/06/18/12
1727 # https://www.impo.com.uy/diariooficial/1920/04/27/9
1728 #
1729 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced
1730 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14
1731 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the
1732 # National Council of Administration the same day, published directly below the
1733 # law in the Diario Oficial, specified the first transition to be 1923-09-30
1734 # 24:00. This effectively established standard time at UT-03:30 with 30
1735 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No.
1736 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other
1737 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolución
1738 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it
1739 # would have been under the previous law.
1740 # https://www.impo.com.uy/diariooficial/1923/07/02/2
1741 # https://www.impo.com.uy/diariooficial/1926/03/10/2
1742 # https://www.impo.com.uy/diariooficial/1926/03/18/2
1743 #
1744 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1745 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 -
1746 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
1747 # From Tim Parenti (2018-02-15):
1748 # http://www.impo.com.uy/diariooficial/1933/10/27/6
1749 #
1750 # It appears Ley No. 9122 of 1933 was never published as such in the Diario
1751 # Oficial, but instead appeared as Document 26 in the Diario on Friday
1752 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of
1753 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the
1754 # last Sunday of October...until the last Saturday of March." In accordance
1755 # with this provision, the first transition was explicitly specified in Article
1756 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29
1757 # at 00:00. Assume transitions at 00:00 Sunday throughout.
1758 #
1759 # Departing from the matter-of-fact nature of previous timekeeping laws, the
1760 # 1933 decree "consider[s] the advantages of...the advance of legal time":
1761 #
1762 # "Whereas: The measure adopted by almost all nations at the time of the last
1763 # World War still persists in North America and Europe, precisely because of
1764 # the economic, hygienic, and social advantages derived from such an
1765 # emergency measure...
1766 #
1767 # Whereas: The advance of the legal time during the summer seasons, by
1768 # displacing social activity near sunrise, favors the citizen populations
1769 # and especially the society that creates and works..."
1770 #
1771 # It further specified that "necessary measures" be taken to ensure that
1772 # "public spectacles finish, in general, before [01:00]."
1773 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 -
1774 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 -
1775 # From Tim Parenti (2018-02-15):
1776 # Most of the Rules below, and their contemporaneous Zone lines, have been
1777 # updated simply to match the Almanaque 2018. Although the document does not
1778 # list exact transition times, midnight transitions were already present in our
1779 # data here for all transitions through 2004-09, and this is both consistent
1780 # with prior transitions and verified in several decrees marked below between
1781 # 1939-09 and 2004-09, wherein the relevant text was typically of the form:
1782 #
1783 # "From 0 hours on [date], the legal time of the entire Republic will be...
1784 #
1785 # In accordance with [the preceding], on [previous date] at 24 hours, all
1786 # clocks throughout the Republic will be [advanced/retarded] by..."
1787 #
1788 # It is possible that there is greater specificity to be found for the Rules
1789 # below, but it is buried in no fewer than 40 different decrees individually
1790 # referenced by the Almanaque for the period from 1939-09 to 2014-09.
1791 # Four-fifths of these were promulgated less than two weeks before taking
1792 # effect; more than half within a week and none more than 5 weeks. Only the
1793 # handful with comments below have been checked with any thoroughness.
1794 Rule Uruguay 1939 only - Oct 1 0:00 0:30 -
1795 Rule Uruguay 1940 only - Oct 27 0:00 0:30 -
1796 # From Tim Parenti (2018-02-15):
1797 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified
1798 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel".
1799 # http://www.impo.com.uy/diariooficial/1941/08/04/1
1800 Rule Uruguay 1941 only - Aug 1 0:00 0:30 -
1801 # From Tim Parenti (2018-02-15):
1802 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified
1803 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks
1804 # never went back to UT-03:30 thereafter, this is modeled as advancing standard
1805 # time by 30 minutes to UT-03, while retaining 30 minutes of DST.
1806 # http://www.impo.com.uy/diariooficial/1942/12/16/3
1807 Rule Uruguay 1942 only - Dec 14 0:00 0:30 -
1808 Rule Uruguay 1943 only - Mar 14 0:00 0 -
1809 Rule Uruguay 1959 only - May 24 0:00 0:30 -
1810 Rule Uruguay 1959 only - Nov 15 0:00 0 -
1811 Rule Uruguay 1960 only - Jan 17 0:00 1:00 -
1812 Rule Uruguay 1960 only - Mar 6 0:00 0 -
1813 Rule Uruguay 1965 only - Apr 4 0:00 1:00 -
1814 Rule Uruguay 1965 only - Sep 26 0:00 0 -
1815 # From Tim Parenti (2018-02-15):
1816 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the
1817 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00.
1818 # http://www.impo.com.uy/diariooficial/1968/05/30/5
1819 Rule Uruguay 1968 only - May 27 0:00 0:30 -
1820 Rule Uruguay 1968 only - Dec 1 0:00 0 -
1821 # From Tim Parenti (2018-02-15):
1822 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity
1823 # consumption "as a consequence of the current rainfall regime in the country".
1824 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00.
1825 # http://www.impo.com.uy/diariooficial/1970/04/29/4
1826 Rule Uruguay 1970 only - Apr 25 0:00 1:00 -
1827 Rule Uruguay 1970 only - Jun 14 0:00 0 -
1828 Rule Uruguay 1972 only - Apr 23 0:00 1:00 -
1829 Rule Uruguay 1972 only - Jul 16 0:00 0 -
1830 # From Tim Parenti (2018-02-15):
1831 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of
1832 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of
1833 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30
1834 # minutes followed in Decreto 679/974 of 1974-08-29.
1835 # http://www.impo.com.uy/diariooficial/1974/01/22/11
1836 # http://www.impo.com.uy/diariooficial/1974/03/14/3
1837 # http://www.impo.com.uy/diariooficial/1974/09/04/6
1838 Rule Uruguay 1974 only - Jan 13 0:00 1:30 -
1839 Rule Uruguay 1974 only - Mar 10 0:00 0:30 -
1840 Rule Uruguay 1974 only - Sep 1 0:00 0 -
1841 Rule Uruguay 1974 only - Dec 22 0:00 1:00 -
1842 Rule Uruguay 1975 only - Mar 30 0:00 0 -
1843 Rule Uruguay 1976 only - Dec 19 0:00 1:00 -
1844 Rule Uruguay 1977 only - Mar 6 0:00 0 -
1845 Rule Uruguay 1977 only - Dec 4 0:00 1:00 -
1846 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 -
1847 Rule Uruguay 1978 only - Dec 17 0:00 1:00 -
1848 Rule Uruguay 1979 only - Apr 29 0:00 1:00 -
1849 Rule Uruguay 1980 only - Mar 16 0:00 0 -
1850 # From Tim Parenti (2018-02-15):
1851 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist
1852 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00.
1853 # http://www.impo.com.uy/diariooficial/1988/01/25/1
1854 Rule Uruguay 1987 only - Dec 14 0:00 1:00 -
1855 Rule Uruguay 1988 only - Feb 28 0:00 0 -
1856 Rule Uruguay 1988 only - Dec 11 0:00 1:00 -
1857 Rule Uruguay 1989 only - Mar 5 0:00 0 -
1858 Rule Uruguay 1989 only - Oct 29 0:00 1:00 -
1859 Rule Uruguay 1990 only - Feb 25 0:00 0 -
1860 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04):
1861 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the
1862 # 1992/1993 season appears to be the first in over half a century where DST
1863 # both began and ended pursuant to the same decree.
1864 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 -
1865 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 -
1866 Rule Uruguay 1992 only - Oct 18 0:00 1:00 -
1867 Rule Uruguay 1993 only - Feb 28 0:00 0 -
1868 # From Eduardo Cota (2004-09-20):
1869 # The Uruguayan government has decreed a change in the local time....
1870 # From Tim Parenti (2018-02-15):
1871 # Decreto 328/004 of 2004-09-15.
1872 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1
1873 Rule Uruguay 2004 only - Sep 19 0:00 1:00 -
1874 # From Steffen Thorsen (2005-03-11):
1875 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
1876 # save energy ... it was postponed two weeks....
1877 # From Tim Parenti (2018-02-15):
1878 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous
1879 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending
1880 # Decreto 328/004:
1881 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1
1882 # The original decree specified a transition of 2005-03-12 24:00, but the new
1883 # one specified 2005-03-27 02:00.
1884 Rule Uruguay 2005 only - Mar 27 2:00 0 -
1885 # From Eduardo Cota (2005-09-27):
1886 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time,
1887 # official time in Uruguay will be at GMT -2.
1888 # From Tim Parenti (2018-02-15):
1889 # Decreto 318/005 of 2005-09-19.
1890 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1
1891 Rule Uruguay 2005 only - Oct 9 2:00 1:00 -
1892 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 -
1893 # From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06):
1894 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday
1895 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque
1896 # 2018 appears to have a few typoed dates through this period; ignore them.
1897 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1
1898 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 -
1899 # From Steffen Thorsen (2015-06-30):
1900 # ... it looks like they will not be using DST the coming summer:
1901 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
1902 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
1903 # From Paul Eggert (2015-06-30):
1904 # Apparently restaurateurs complained that DST caused people to go to the beach
1905 # instead of out to dinner.
1906 # From Pablo Camargo (2015-07-13):
1907 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
1908 # From Tim Parenti (2018-02-15):
1909 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.
1910
1911 # This Zone can be simplified once we assume zic %z.
1912 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10
1913 -3:44:51 - MMT 1920 May 1 # Montevideo MT
1914 -4:00 - -04 1923 Oct 1
1915 -3:30 Uruguay -0330/-03 1942 Dec 14
1916 -3:00 Uruguay -03/-0230 1960
1917 -3:00 Uruguay -03/-02 1968
1918 -3:00 Uruguay -03/-0230 1970
1919 -3:00 Uruguay -03/-02 1974
1920 -3:00 Uruguay -03/-0130 1974 Mar 10
1921 -3:00 Uruguay -03/-0230 1974 Dec 22
1922 -3:00 Uruguay -03/-02
1923
1924 # Venezuela
1925 #
1926 # From Paul Eggert (2015-07-28):
1927 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
1928 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
1929 #
1930 # From John Stainforth (2007-11-28):
1931 # ... the change for Venezuela originally expected for 2007-12-31 has
1932 # been brought forward to 2007-12-09. The official announcement was
1933 # published today in the "Gaceta Oficial de la República Bolivariana
1934 # de Venezuela, número 38.819" (official document for all laws or
1935 # resolution publication)
1936 # http://www.globovision.com/news.php?nid=72208
1937
1938 # From Alexander Krivenyshev (2016-04-15):
1939 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
1940 #
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