TZ corrections

Jesper Norgaard Welen jnorgard at prodigy.net.mx
Tue Apr 26 23:56:31 UTC 2005


For the Palmer station in Antarctica, the rule ArgAQ has been declared.
But
the rule ArgAQ is not used until 1965, while the rule is defined for
year
1964. Therefore it would be more reasonable to redefine it the following
way:

-Rule	ArgAQ	1964	1966	-	Mar	 1	0:00	0
-
-Rule	ArgAQ	1964	1966	-	Oct	15	0:00	1:00
S
+Rule	ArgAQ	1965	1966	-	Mar	 1	0:00	0
-
+Rule	ArgAQ	1965	1966	-	Oct	15	0:00	1:00
S
Zone Antarctica/Palmer	0	-	zzz	1965
			-4:00	ArgAQ	AR%sT	1969 Oct 5

In the Argentina timezones, it seems that apart from the initial LMT
(which is of course different), the Catamarca timezone and the Chubut
timezone
are in fact identical, so I suggest:

#
# Catamarca (CT)
Zone America/Argentina/Catamarca -4:23:08 - LMT	1894 Oct 31
			-4:16:48 -	CMT	1920 May
			-4:00	-	ART	1930 Dec
			-4:00	Arg	AR%sT	1969 Oct  5
			-3:00	Arg	AR%sT	1991 Mar  3
			-4:00	-	WART	1991 Oct 20
			-3:00	Arg	AR%sT	1999 Oct  3
			-4:00	Arg	AR%sT	2000 Mar  3
			-3:00	-	ART	2004 Jun  1
			-4:00	-	WART	2004 Jun 20
			-3:00	-	ART

#
# Chubut (CH)
# The name "Comodoro Rivadavia" exceeds the 14-byte POSIX limit.
-Zone America/Argentina/ComodRivadavia -4:30:00 - LMT	1894 Oct 31
-			-4:16:48 -	CMT	1920 May
-			-4:00	-	ART	1930 Dec
-			-4:00	Arg	AR%sT	1969 Oct  5
-			-3:00	Arg	AR%sT	1991 Mar  3
-			-4:00	-	WART	1991 Oct 20
-			-3:00	Arg	AR%sT	1999 Oct  3
-			-4:00	Arg	AR%sT	2000 Mar  3
-			-3:00	-	ART	2004 Jun  1
-			-4:00	-	WART	2004 Jun 20
-			-3:00	-	ART
+Link	America/Argentina/Catamarca America/Argentina/ComodRivadavia

In the 'asia' file, the EUAsia rule is defined from 1981 to max. In
fact, it
is not used for any timezones before 1996, so I suggest:

-Rule	EUAsia	1981	max	-	Mar	lastSun	 1:00u	1:00
S
+Rule	EUAsia	1996	max	-	Mar	lastSun	 1:00u	1:00
S
Rule	EUAsia	1996	max	-	Oct	lastSun	 1:00u	0
-

			2:00	Cyprus	EE%sT	1998 Sep
			2:00	EUAsia	EE%sT

			4:00	-	AZT	1996 # Azerbaijan time
			4:00	EUAsia	AZ%sT	1997

The E-EurAsia rule is defined from 1979, but not used until 1992. I
suggest:

-Rule E-EurAsia	1981	max	-	Mar	lastSun	 0:00	1:00
S
-Rule E-EurAsia	1979	1995	-	Sep	lastSun	 0:00	0
-
+Rule E-EurAsia	1992	max	-	Mar	lastSun	 0:00	1:00
S
+Rule E-EurAsia	1992	1995	-	Sep	lastSun	 0:00	0
-
Rule E-EurAsia	1996	max	-	Oct	lastSun	 0:00	0
-

			3:00 RussiaAsia GE%sT	1992 # Georgia Time
			3:00 E-EurAsia	GE%sT	1994 Sep lastSun
			4:00 E-EurAsia	GE%sT	1996 Oct lastSun
			4:00	1:00	GEST	1997 Mar lastSun
			4:00 E-EurAsia	GE%sT	2004 Jun 27
			3:00 RussiaAsia	GE%sT

As far as I can see, the 1949-part of the PRC rule doesn't actually have
any effect, so it could be deleted:

-Rule	PRC	1949	only	-	Jan	 1	0:00	0
S
Rule	PRC	1986	only	-	May	 4	0:00	1:00
D

As we see below, only in Shanghai it is inside a time range where it is
activated, but as far as I can see, before and after the rule, GMT
offset
will be +8:

Zone	Asia/Harbin	8:26:44	-	LMT	1928 # or Haerbin
			8:30	-	CHAT	1932 Mar # Changbai Time
			8:00	-	CST	1940
			9:00	-	CHAT	1966 May
			8:30	-	CHAT	1980 May
			8:00	PRC	C%sT
# Zhongyuan Time ("Central plain Time")
Zone	Asia/Shanghai	8:05:52	-	LMT	1928
			8:00	Shang	C%sT	1949
			8:00	PRC	C%sT
# Long-shu Time (probably due to Long and Shu being two names of that
area)
Zone	Asia/Chongqing	7:06:20	-	LMT	1928 # or Chungking
			7:00	-	LONT	1980 May # Long-shu Time
			8:00	PRC	C%sT
# Xin-zang Time ("Xinjiang-Tibet Time")
Zone	Asia/Urumqi	5:50:20	-	LMT	1928 # or Urumchi
			6:00	-	URUT	1980 May # Urumqi Time
			8:00	PRC	C%sT
# Kunlun Time
Zone	Asia/Kashgar	5:03:56	-	LMT	1928 # or Kashi or
Kaxgar
			5:30	-	KAST	1940	 # Kashgar Time
			5:00	-	KAST	1980 May
			8:00	PRC	C%sT


In my home country Denmark, it seems that there is a superfluous rule
for
2.nd of April 1945, which I suggest to delete:

Rule	Denmark	1940	only	-	May	15	 0:00	1:00
S
-Rule	Denmark	1945	only	-	Apr	 2	 2:00s	1:00
S
Rule	Denmark	1945	only	-	Aug	15	 2:00s	0
-

Unles my interpretation is wrong, both before and after the rule takes
effect in April 2, 1945, the time
in Denmark would be GMT+2 (e.g. GMT+1 +1), or does it mean that time is
GMT+3? As a side-question, I haven't been able to check this with any
Time Zone Converter (the web version has a cutoff date of 1970). Is
there
any way to check this by a program, and which?

Concerning the original definition for Denmark:

Zone Europe/Copenhagen	 0:50:20 -	LMT	1890
-			 0:50:20 -	CMT	1894 Apr  # Copenhagen
Mean Time
+			 0:50:20 -	CMT	1894 Jan  1 0:00 #
Copenhagen Mean Time
			 1:00	Denmark	CE%sT	1942 Nov  2 2:00s

I found some references in old on-line lawtexts in Denmark:

The page http://www.hum.aau.dk/~poe/tid/tine/DanskTid.htm says that the
law
was in effect from 1. January 1894, not from April.

The page http://www.retsinfo.dk/_GETDOCI_/ACCN/A18930008330-REGL
confirms this, and states that the law was put forth 29.th. of March
1893 
specifying that it would be in effect from 1.st. of January 1894.

The EU treaty with effect from 1973:
http://www.retsinfo.dk/_GETDOCI_/ACCN/A19722110030-REGL

This provoked a new law from 1974 to make possible summer time changes 
in subsequenet decrees with the law
http://www.retsinfo.dk/_GETDOCI_/ACCN/A19740022330-REGL

It seems however that no decree was set forward until 1980. I have not
found any
decree, but in another related law, the effecting DST changes are stated
explicitly:
to be from 6.th. of April 1980 at 2.00 to 28.th. of September 1980 at
2.00.
If this is true, this differs slightly from the EU rule in that DST runs
to 2.00, 
not 3.00. We don't know when Denmark began using the EU rule correctly,
but we
have only confirmation of the 1980-time, so I presume it was correct in
1981:
The law is about the management of the extra hour, concerning working
hours reported
and effect on obligatory-rest rules (which was suspended on that night):
http://www.retsinfo.dk/_GETDOCI_/ACCN/C19801120554-REGL

I suggest the following changes:

Rule	Denmark	1948	only	-	Aug	 8	 2:00s	0
-
+Rule	Denmark	1980	only	-	Apr	Sun>=1	 2:00	1:00
S
+Rule	Denmark	1980	only	-	Sep	lastSun	 2:00	0
-
# Whitman also gives 1949 Apr 9 to 1949 Oct 1, and disagrees in minor
ways
# about many of the above dates; go with Shanks.
#
-# For 1894, Shanks says Jan, Whitman Apr; go with Whitman.
+# For 1894, Shanks says Jan, Whitman Apr; go with Shanks.
# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
Zone Europe/Copenhagen	 0:50:20 -	LMT	1890
-			 0:50:20 -	CMT	1894 Apr  # Copenhagen
Mean Time
+			 0:50:20 -	CMT	1894 Jan  1 0:00 #
Copenhagen Mean Time
			 1:00	Denmark	CE%sT	1942 Nov  2 2:00s
			 1:00	C-Eur	CE%sT	1945 Apr  2 2:00
-			 1:00	Denmark	CE%sT	1980
+			 1:00	Denmark	CE%sT	1981
			 1:00	EU	CE%sT

In Norway, I accidentally tripped over some new information from the
Metheorological
Institute in Norway, citing information from The Theoretical
Astrophysics Institute
of the University in Oslo:

http://met.no/met/met_lex/q_u/sommertid.html

This in effect confirms the information from Shanks, although there is a
discrepancy
for 1940-1942. I suggest the following changes:

# Norway
# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE
LETTER/S
# Whitman gives 1916 May 21 - 1916 Oct 21; go with Shanks.
Rule	Norway	1916	only	-	May	22	1:00	1:00
S
Rule	Norway	1916	only	-	Sep	30	0:00	0
-
# Whitman says DST observed 1935-08-11/1942-11-01, then
1943-03-29/10-04,
-# 1944-04-03/10-02, and 1945-04-01/10-01; go with Shanks.
+# 1944-04-03/10-02, and 1945-04-01/10-01; Shanks says C-Eur rules from
+# August 10, 1940. Go with Oslo University, Institute for Astrophysics,
+# see http://met.no/met/met_lex/q_u/sommertid.html.
+Rule	Norway	1940	only	-	Aug	11	2:00s	1:00
S
+Rule	Norway	1942	only	-	Nov	 2	2:00s	0
-
Rule	Norway	1945	only	-	Apr	 2	2:00s	1:00
S
Rule	Norway	1945	only	-	Oct	 1	2:00s	0
-
Rule	Norway	1959	1964	-	Mar	Sun>=15	2:00s	1:00
S
Rule	Norway	1959	1965	-	Sep	Sun>=15	2:00s	0
-
Rule	Norway	1965	only	-	Apr	25	2:00s	1:00
S
# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Oslo	0:43:00 -	LMT	1895 Jan  1
-			1:00	Norway	CE%sT	1940 Aug 10 23:00
+			1:00	Norway	CE%sT	1943
			1:00	C-Eur	CE%sT	1945 Apr  2  2:00
			1:00	Norway	CE%sT	1980
			1:00	EU	CE%sT

Regards,
Jesper Nørgaard Welen

Jesper Nørgaard Welen
Email: jnorgard at Prodigy.Net.mx	
Project Leader (Líder de Proyecto) Software
CIMMYT  -  Centro Internacional de Mejoramiento de Maíz y Trigo
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Download the free program World Time Explorer, I made:
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