Japan to use DST. Indiana changed? Changes for Israel, W-SU, etc.

Paul Eggert eggert at twinsun.com
Tue Apr 4 18:12:12 UTC 1995


The big news is that Japan will most likely start using daylight
saving next year.  It isn't confirmed yet, but it seems probable.
See below for details.  A lot of software in Japan will have to be
rewritten, since they haven't used daylight saving since the dawn of
the computer era.  This looks like a growth opportunity for tz....

Also, while I was in Japan last month I read a newspaper article
talking about daylight saving; it mentioned something about the
Indiana legislature changing the time zone rules again in the last few
weeks.  No details.  Anybody else heard anything about this rumor?

Other than that, here are proposed changes to the current tz rules:

Proposed changes that affect behavior:
* Ephraim Silverberg's correction for this autumn's transition in Israel.
* Make `W-SU' a link to Europe/Moscow instead of something with ???? in it.

Proposed comment and/or cleanup changes:
* Remove unused GB-Eire rules starting in 1996, and comment on the
  relationship between GB-Eire and EC.
* Comments about the proposed daylight saving time in Japan in 1996.
* Comments about DST in Japan between 1948 and 1951.
* Comment Serbia/Yugoslavia's name more accurately.

PS.  I'll be on vacation starting Thursday so won't answer mail for a while.

===================================================================
RCS file: RCS/asia,v
retrieving revision 1994.8
retrieving revision 1994.8.1.1
diff -c -r1994.8 -r1994.8.1.1
*** asia	1994/12/10 16:26:05	1994.8
--- asia	1995/04/04 18:04:39	1994.8.1.1
***************
*** 48,54 ****
  #	8:00	PST PDT	Philippines*
  #	8:00	SGT	Singapore
  #	8:00	UST UDT	Ulan Bator*
! #	9:00	JST	Japan
  #	9:00	KST KDT	Korea
  #	9:00	MLT	Moluccas*
  #	9:30	CST	Australian Central Standard Time
--- 48,54 ----
  #	8:00	PST PDT	Philippines*
  #	8:00	SGT	Singapore
  #	8:00	UST UDT	Ulan Bator*
! #	9:00	JST JDT	Japan
  #	9:00	KST KDT	Korea
  #	9:00	MLT	Moluccas*
  #	9:30	CST	Australian Central Standard Time
***************
*** 461,467 ****
  Rule    Zion    1994    only    -       Apr      1      0:00    1:00    D
  Rule    Zion    1994    only    -       Aug     28      0:00    0:00    S
  Rule    Zion    1995    only    -       Mar     31      0:00    1:00    D
! Rule    Zion    1995    only    -       Aug     27      0:00    0:00    S
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Asia/Tel_Aviv	2:19:04 -	LMT	1880
--- 461,474 ----
  Rule    Zion    1994    only    -       Apr      1      0:00    1:00    D
  Rule    Zion    1994    only    -       Aug     28      0:00    0:00    S
  Rule    Zion    1995    only    -       Mar     31      0:00    1:00    D
! # On 1995-03-13 Ephraim Silverberg corrected the next line from Aug 27 to Sep 3.
! Rule    Zion    1995    only    -       Sep      3      0:00    0:00    S
! 
! # From Ephraim Silverberg (1995-03-13):
! # The Spokeswoman's office confirmed that there are not yet any dates
! # for the timezone conversion for the years 1996 and beyond yet
! # and this is one of the things the newly-appointed Minister of Interior
! # will have to decide sometime this year.
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Asia/Tel_Aviv	2:19:04 -	LMT	1880
***************
*** 475,494 ****
  
  # `9:00' and `JST' is from Guy Harris.
  
! # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
! # Shanks says that the far southern Ryukyu Is (Nansei-Shoto) are 8:00,
! # but we don't have a good location name for them;
! # we don't even know the name of the principal town.
! # There is no information for Marcus.
! # Other Japanese possessions are probably like Asia/Tokyo.
  
  # From Shanks (1991):
  # Japan switched from the Japanese calendar on 1893 Jan 1.
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Asia/Tokyo	9:19:04	-	LMT	1896
  			9:00	-	JST
  #Zone Asia/South_Ryukyu	8:14:44	-	LMT	1896	# Amitori
  #			8:00	-	CST
  
  # Jordan
  # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
--- 482,525 ----
  
  # `9:00' and `JST' is from Guy Harris.
  
! # From Paul Eggert <eggert at twinsun.com> (1995-03-06):
! # Today's _Asahi Evening News_ (page 4) reports that Japan had
! # daylight saving between 1948 and 1951, but ``the system was discontinued
! # because the public believed it would lead to longer working hours.''
! # Shanks writes that daylight saving in Japan during those years was as follows:
! # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
! #Rule	Japan	1948	only	-	May	Sun>=1	2:00	1:00	D
! #Rule	Japan	1948	1951	-	Sep	Sat>=8	2:00	0	S
! #Rule	Japan	1949	only	-	Apr	Sun>=1	2:00	1:00	D
! #Rule	Japan	1950	1951	-	May	Sun>=1	2:00	1:00	D
! # but the only locations using it were US military bases.
! # We go with Shanks and omit daylight saving in those years for Asia/Tokyo.
! #
! # The same news article also reports that Japan is likely to go on DST in 1996
! # as follows, where I've guessed the AT and LETTER/S columns:
! # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
! #Rule	Japan	1996	max	-	Apr	Sun>=1	2:00	1:00	D
! #Rule	Japan	1996	max	-	Oct	lastSun	2:00	0	S
  
  # From Shanks (1991):
  # Japan switched from the Japanese calendar on 1893 Jan 1.
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Asia/Tokyo	9:19:04	-	LMT	1896
  			9:00	-	JST
+ # If Japan adopts DST in 1996, replace the above line with the following lines:
+ #			9:00	-	JST	1996
+ #			9:00	Japan	J%sT
+ # and uncomment the two `Rule' lines commented out above.
+ 
+ # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
+ # Shanks says that the far southern Ryukyu Is (Nansei-Shoto) are 8:00,
+ # but we don't have a good location name for them;
+ # we don't even know the name of the principal town.
+ # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  #Zone Asia/South_Ryukyu	8:14:44	-	LMT	1896	# Amitori
  #			8:00	-	CST
+ # There is no information for Marcus.
+ # Other Japanese possessions are probably like Asia/Tokyo.
  
  # Jordan
  # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
===================================================================
RCS file: RCS/backward,v
retrieving revision 1995.2
retrieving revision 1995.2.1.1
diff -c -r1995.2 -r1995.2.1.1
*** backward	1995/02/21 15:43:22	1995.2
--- backward	1995/03/23 01:42:23	1995.2.1.1
***************
*** 73,76 ****
--- 73,77 ----
  Link	Pacific/Samoa		US/Samoa
  Link	Etc/UTC			UTC
  Link	Etc/Universal		Universal
+ Link	Europe/Moscow		W-SU
  Link	Etc/Zulu		Zulu
===================================================================
RCS file: RCS/europe,v
retrieving revision 1995.2
retrieving revision 1995.2.1.1
diff -c -r1995.2 -r1995.2.1.1
*** europe	1995/02/21 15:43:19	1995.2
--- europe	1995/04/04 10:39:24	1995.2.1.1
***************
*** 714,724 ****
  Rule	GB-Eire	1971	only	-	Oct	31	3:00	0	GMT
  Rule	GB-Eire	1972	1980	-	Oct	Sun>=23	2:00s	0	GMT
  # 1981 on
! Rule	GB-Eire	1981	max	-	Mar	lastSun	1:00u	1:00	BST
  Rule	GB-Eire 1981	1989	-	Oct	Sun>=23	1:00u	0	GMT
  Rule	GB-Eire 1990	1995	-	Oct	Sun>=22	1:00u	0	GMT
! Rule	GB-Eire 1996	max	-	Oct	lastSun	1:00u	0	GMT
! # Also see EC, which (starting 1996) differs only in LETTER/S.
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Europe/London	-0:01:15 -	LMT	1847 Sep 22
--- 714,723 ----
  Rule	GB-Eire	1971	only	-	Oct	31	3:00	0	GMT
  Rule	GB-Eire	1972	1980	-	Oct	Sun>=23	2:00s	0	GMT
  # 1981 on
! Rule	GB-Eire	1981	1995	-	Mar	lastSun	1:00u	1:00	BST
  Rule	GB-Eire 1981	1989	-	Oct	Sun>=23	1:00u	0	GMT
  Rule	GB-Eire 1990	1995	-	Oct	Sun>=22	1:00u	0	GMT
! # See EC for rules starting in 1996.
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Europe/London	-0:01:15 -	LMT	1847 Sep 22
***************
*** 760,766 ****
  Rule	EC	1979	1995	-	Sep	lastSun	 1:00u	0	-
  Rule	EC	1981	max	-	Mar	lastSun	 1:00u	1:00	" DST"
  Rule	EC	1996	max	-	Oct	lastSun	 1:00u	0	-
- # Also see GB-Eire, which (starting 1996) differs only in LETTER/S.
  
  # W-Eur differs from EC only in that W-Eur uses standard time.
  Rule	W-Eur	1800	only	-	Jan	 1	 0:00	0	-
--- 759,764 ----
***************
*** 824,830 ****
  Zone	WET		0:00	EC	WET%s
  Zone	MET		1:00	M-Eur	MET%s
  Zone	EET		2:00	EC	EET%s
- Zone	W-SU		3:00	M-Eur	????
  
  # Tom Hoffman says that MET is also known as Central European Time
  
--- 822,827 ----
***************
*** 1789,1795 ****
  			12:00	-	ASK	1992 Jan 19 2:00s
  			13:00	Russia	AS%s
  
! # Serbia
  # They switched from the Julian to the Gregorian calendar on 1918 Mar 18.
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Europe/Belgrade	1:22:00	-	LMT	1884
--- 1786,1792 ----
  			12:00	-	ASK	1992 Jan 19 2:00s
  			13:00	Russia	AS%s
  
! # Yugoslavia (what's left of it -- mostly Serbia)
  # They switched from the Julian to the Gregorian calendar on 1918 Mar 18.
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	Europe/Belgrade	1:22:00	-	LMT	1884



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