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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