Istanbul,Turkey needs time zone rule update

[Paul Eggert]

> From: Amar Devegowda [mailto:ADEVEGOW at in.ibm.com] 
> Sent: Wednesday, January 03, 2007 1:15 PM
>
> The time zone rules for Istanbul, Turkey have not been changed for
> years now.  It seems like that it was last updated in year 1985 or so.
>
> The latest rules are available at - 
> http://www.timeanddate.com/worldclock/timezone.html?n=107 

Thanks for the info.  For our reference, can you please point us to a
more-official web site that contains this information?  Preferably
English, but it's OK if it's Turkish.  The Turkish goverment would be
best, but newspapers are fine.

Also, can you please try the following patch yourself, and verify that
it's right?  This patch changes time stamps only for 1991 and later.
I could not find any discrepancies before 1991 between the current tz
data and the source you cite.  1991 != 1985, so I'm worried that I've
made a mistake in it.

Thanks.

===================================================================
RCS file: RCS/europe,v
retrieving revision 2006.14.0.1
diff -pu -r2006.14.0.1 europe
--- europe	2007/01/02 17:34:54	2006.14.0.1
+++ europe	2007/01/03 20:16:30
@@ -2278,6 +2278,14 @@ Zone	Europe/Zurich	0:34:08 -	LMT	1848 Se
 			1:00	EU	CE%sT
 
 # Turkey
+
+# From Amar Devegowda (2007-01-03):
+# The time zone rules for Istanbul, Turkey have not been changed for years now.
+# ... The latest rules are available at -
+# http://www.timeanddate.com/worldclock/timezone.html?n=107
+# From Paul Eggert (2007-01-03):
+# Prefer the above source to Shanks & Pottenger for time stamps after 1990.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Turkey	1916	only	-	May	 1	0:00	1:00	S
 Rule	Turkey	1916	only	-	Oct	 1	0:00	0	-
@@ -2332,14 +2340,17 @@ Rule	Turkey	1983	only	-	Jul	31	0:00	1:00
 Rule	Turkey	1983	only	-	Oct	 2	0:00	0	-
 Rule	Turkey	1985	only	-	Apr	20	0:00	1:00	S
 Rule	Turkey	1985	only	-	Sep	28	0:00	0	-
+Rule	Turkey	1986	1990	-	Mar	lastSun	2:00s	1:00	S
+Rule	Turkey	1986	1990	-	Sep	lastSun	2:00s	0	-
+Rule	Turkey	1991	max	-	Mar	lastSun	1:00s	1:00	S
+Rule	Turkey	1991	1995	-	Sep	lastSun	1:00s	0	-
+Rule	Turkey	1996	max	-	Oct	lastSun	1:00s	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 			1:56:56	-	IMT	1910 Oct # Istanbul Mean Time?
 			2:00	Turkey	EE%sT	1978 Oct 15
 			3:00	Turkey	TR%sT	1985 Apr 20 # Turkey Time
-			2:00	Turkey	EE%sT	1986
-			2:00	C-Eur	EE%sT	1991
-			2:00	EU	EE%sT
+			2:00	Turkey	EE%sT
 Link	Europe/Istanbul	Asia/Istanbul	# Istanbul is in both continents.
 
 # Ukraine