
The page http://www.worldtimeserver.com claims that Chile starts DST this Sunday 8.th. of October at 1:00 so I got interested in if we have the information right concerning Chile. This made me revise the information in the tz database, which lead to the page http://www.shoa.cl which represents the oficial timekeeping of the armed forces of Chile, which in turn is the only authority on time setting matters in Chile since 11.th. of January 1966 according to decree No. 25 of that year. CIA factbook says on page http://www.cia.gov/cia/publications/factbook/geos/ci.html that DST starts second Sunday in October, ends Second Sunday of March. But according to the official page it is really Second Saturday of October at 24:00 and Second Saturday of March at 24:00. 2006 happens to be a year where these two rules get to different results, in fact DST begins in Chile in 2006 Saturday 14.th. of March at 24:00, according to one of the Chile web pages. In tz database, file southamerica says: # From Paul Eggert (2002-10-24): # <http://www.shoa.cl/shoa/faqhoraoficial.htm> gives many details that # disagree with the following table, but we haven't had time to compare them. As far as I see it, this is the maximum authority of time setting in Chile, which should supersede tz database, Shanks, IATA etc. If you disagree on this point, please forward good arguments. Therefore I recommend the following changes to the tz database. I took the time to check out in detail what the differences are from this source compared to tz database, based on the page http://www.horaoficial.cl/horaof.htm which contains timezone and time history in Chile since 1884. Here are the results if you apply those to the tz database (I might have made mistakes, since there are plenty of differences): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Chile 1927 1931 - Sep 1 0:00 1:00 S Rule Chile 1928 1932 - Apr 1 0:00 0 - Rule Chile 1946 only - Aug 27 4:00u 1:00 S Rule Chile 1947 only - May 21 2:00u 0 - Rule Chile 1968 only - Nov 2 4:00u 1:00 S Rule Chile 1969 only - Mar 29 3:00u 0 - Rule Chile 1969 only - Nov 22 4:00u 1:00 S Rule Chile 1970 only - Mar 28 3:00u 0 - Rule Chile 1971 only - Mar 13 3:00u 0 - Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1973 only - Sep 29 4:00u 1:00 S Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1987 only - Apr 12 3:00u 0 - Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 - Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S Rule Chile 1990 only - Mar 18 3:00u 0 - Rule Chile 1990 only - Sep 16 4:00u 1:00 S Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1997 only - Mar 30 3:00u 0 - Rule Chile 1998 only - Sep 27 4:00u 1:00 S Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - Rule Chile 1999 only - Apr 4 3:00u 0 - Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S Rule Chile 2000 max - Mar Sun>=9 3:00u 0 - # IATA SSIM anomalies: (1992-02) says 1992-03-14; # (1996-09) says 1998-03-08. Ignore these. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Santiago -4:42:40 - LMT 1890 -4:42:40 - SMT 1910 Jan 10 # Santiago Mean Time -5:00 - CL%sT 1916 Jul 1 # Chile Time -4:42:46 - SMT 1918 Sep 10 # Santiago Mean Time -4:00 - CL%sT 1919 Jul 1 # Chile Time -4:42:46 - SMT 1927 Aug 22 # Santiago Mean Time -5:00 Chile CL%sT 1932 Sep # Chile Time -4:00 Chile CL%sT Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri -7:17:28 - MMT 1932 Sep # Mataveri Mean Time -7:00 Chile EAS%sT 1982 Jan 18 21:00 # Easter I Time -6:00 Chile EAS%sT Note (1) Since the starting and ending of DST in 1927-1932 is a bit confusing (not covered by a decree of when it ended), I used the tz database as it was, since the first two transitions concur with the web page. It seems that the Chile web page claims that it stopped in 1928, but it doesn't mention a decree about that. Note (2) The DST employment in 1946-1947 was decreed only for the central zone (whatever that is, but surely including Santiago), not for the rest of the country. But since this happens before our cutoff date of 1970, there is no need to make an extra timezone. Note (3) Since one of the IATA anomalies were agreeing with the Chile page, I deleted that from the commentary. I also did not put commentary for if the above changes are accepted (like "Jesper Norgaard wrote ..."), I will leave that happily to whoever might implement it in a coming version of the tz database. Regards, - Jesper Jesper Nørgaard Welen Email: jnorgard@Prodigy.Net.mx Project Leader (Líder de Proyecto) Software CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the shareware program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html

From: Jesper Norgaard Welen Subject: Chile DST history
I took the time to check out in detail what the differences are from this source compared to tz database, based on the page http://www.horaoficial.cl/horaof.htm which contains timezone and time history in Chile since 1884. Here are the results if you apply those to the tz database (I might have made mistakes, since there are plenty of differences):
....
Note (1) Since the starting and ending of DST in 1927-1932 is a bit confusing (not covered by a decree of when it ended), I used the tz database as it was, since the first two transitions concur with the web page. It seems that the Chile web page claims that it stopped in 1928, but it doesn't mention a decree about that.
A table resolving these issues is at: http://www.horaoficial.cl/cambio.htm

I think that there are some obvious mistakes in the suggested link from Oscar van Vlijmen (thanks for that, Oscar!), for instance entry 66 says that GMT-4 ended 12-Sep-1990 while entry 67 only begins GMT-3 at 15-Sep-1990 (they should have been 15-Sep-1990 and 16-Sep-1990 respectively), but anyhow it clears up some doubts too. My new proposal (surely not the last - don't have much fe de errata!) is the following: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Chile 1927 1932 - Sep 1 0:00 1:00 S Rule Chile 1928 1932 - Apr 1 0:00 0 - Rule Chile 1942 only - Jun 1 4:00u 0 - Rule Chile 1942 only - Aug 1 5:00u 1:00 S Rule Chile 1946 only - Jul 15 4:00u 1:00 S Rule Chile 1946 only - Sep 1 3:00u 0:00 - Rule Chile 1947 only - Apr 1 4:00u 0 - Rule Chile 1968 only - Nov 3 4:00u 1:00 S Rule Chile 1969 only - Mar 30 3:00u 0 - Rule Chile 1969 only - Nov 23 4:00u 1:00 S Rule Chile 1970 only - Mar 29 3:00u 0 - Rule Chile 1971 only - Mar 14 3:00u 0 - Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1973 only - Sep 30 4:00u 1:00 S Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1987 only - Apr 12 3:00u 0 - Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 - Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S Rule Chile 1990 only - Mar 18 3:00u 0 - Rule Chile 1990 only - Sep 16 4:00u 1:00 S Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S Rule Chile 1997 only - Mar 30 3:00u 0 - Rule Chile 1998 only - Sep 27 4:00u 1:00 S Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - Rule Chile 1999 only - Apr 4 3:00u 0 - Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S Rule Chile 2000 max - Mar Sun>=9 3:00u 0 - # IATA SSIM anomalies: (1992-02) says 1992-03-14; # (1996-09) says 1998-03-08. Ignore these. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Santiago -4:42:46 - LMT 1890 -4:42:46 - SMT 1910 # Santiago Mean Time -5:00 - CL%sT 1916 Jul 1 # Chile Time -4:42:46 - SMT 1918 Sep 1 # Santiago Mean Time -4:00 - CL%sT 1919 Jul 1 # Chile Time -4:42:46 - SMT 1927 Sep 1 # Santiago Mean Time -5:00 Chile CL%sT 1947 May 22 # Chile Time -4:00 Chile CL%sT Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri -7:17:28 - MMT 1932 Sep # Mataveri Mean Time -7:00 Chile EAS%sT 1982 Jan 18 21:00 # Easter I Time -6:00 Chile EAS%sT Note that we also have to change the entries for Palmer antarctic station once the above has been cleaned up. Regards, - Jesper -----Original Message----- From: Oscar van Vlijmen [mailto:ovv@hetnet.nl] Sent: Domingo, 08 de Octubre de 2006 12:35 To: tz@lecserver.nci.nih.gov Subject: Re: Chile DST history
From: Jesper Norgaard Welen Subject: Chile DST history
I took the time to check out in detail what the differences are from this source compared to tz database, based on the page http://www.horaoficial.cl/horaof.htm which contains timezone and time history in Chile since 1884. Here are the results if you apply those to the tz database (I might have made mistakes, since there are plenty of differences):
....
Note (1) Since the starting and ending of DST in 1927-1932 is a bit confusing (not covered by a decree of when it ended), I used the tz database as it was, since the first two transitions concur with the web page. It seems that the Chile web page claims that it stopped in 1928, but it doesn't mention a decree about that.
A table resolving these issues is at: http://www.horaoficial.cl/cambio.htm

"Jesper Norgaard Welen" <jnorgard@prodigy.net.mx> writes:
My new proposal (surely not the last - don't have much fe de errata!) is the following:
Thanks for all that transcription work. zic complained about a few lines which I fixed, and I sorted the Rule lines by years, but otherwise they look good to me (not that my Spanish is that good...). I'll include them in my next proposed change.
participants (3)
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Jesper Norgaard Welen
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Oscar van Vlijmen
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Paul Eggert