Chile DST history
Jesper Norgaard Welen
jnorgard at prodigy.net.mx
Sun Oct 8 22:58:10 UTC 2006
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 at hetnet.nl]
Sent: Domingo, 08 de Octubre de 2006 12:35
To: tz at 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
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