Iceland's timezone

[Paul Eggert]

   From: Adam David <adam at veda.is>
   To: wollman at uvm-gen.emba.uvm.edu
   Date: Sat, 6 Nov 1993 21:50:43 +0000 (GMT)

   Iceland has not changed timezone since 1900 and has not had Summer Time
   since quite a long time ago, probably before 1970. If you want exact dates
   for summertime that long ago, I will find this out for you.

I'm working on a rewrite of `europe' with a large set of historical
data.  My current draft (see below) claims that Iceland changed its
timezone in 1968.  I've taken this claim from Thomas G. Shanks, The
international atlas (3rd edition), San Diego: ACS Publications, Inc.
(1991).  If you have some better data, please let me know.

It would be nice to know what time zone abbreviations were used before
1968, since Shanks doesn't say.  In the following table I've made up
the names `IST', `IDT', `RMT', and `LMT' for Iceland Standard Time,
Iceland Daylight Time, Reykjavik Mean Time, and Local Mean Time
respectively.

# Iceland
#
# From Adam David <adam at veda.is> (November 6, 1993):
# The name of the timezone in Iceland for system / mail / news purposes is GMT.
#
# From Shanks (1991):
# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
Rule	Iceland	1908	only	-	Jan	1	0:00	0	S
Rule	Iceland	1917	1918	-	Feb	20	2:00	1:00	D
Rule	Iceland	1917	only	-	Oct	25	2:00	0	S
Rule	Iceland	1918	1919	-	Nov	15	2:00	0	S
Rule	Iceland	1919	only	-	Feb	19	2:00	1:00	D
Rule	Iceland	1921	only	-	Mar	19	2:00	1:00	D
Rule	Iceland	1921	only	-	Jun	22	2:00	0	S
Rule	Iceland	1941	1942	-	Mar	Sat>=1	2:00	1:00	D
Rule	Iceland	1941	1942	-	Jul	2	2:00	0	S
Rule	Iceland	1943	1946	-	Mar	Sun>=1	2:00	1:00	D
Rule	Iceland	1943	1948	-	Oct	Sun>=22	2:00	0	S
Rule	Iceland	1947	1962	-	Apr	Sun>=1	2:00	1:00	D
Rule	Iceland	1949	only	-	Oct	30	2:00	0	S
Rule	Iceland	1950	only	-	Oct	22	2:00	0	S
# From Paul Eggert <eggert at twinsun.com> (November 10, 1993):
# Shanks's ``1953 Oct 26'' is probably a typo for Oct 25.
# Likewise, correct Shanks's ``1961 Oct 22'' to Oct 29.
Rule	Iceland	1951	1967	-	Oct	Sun>=23	1:00s	0	S
Rule	Iceland	1963	1968	-	Apr	Sun>=1	1:00s	1:00	D
# Zone	NAME		GMTOFF	RULES/SAVE	FORMAT	[UNTIL]
Zone Atlantic/Iceland/Reykjavik -1:27:24 -	LMT	1837 Jan 1
			-1:28	-		RMT	1908 Jan 1
			-1:00	Iceland		I%sT	1968 Oct 27 1:00s
			0:00	-		GMT
# This link is for backward compatibility with the old naming convention.
Link Atlantic/Iceland/Reykjavik Iceland