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Chatham Islands time
by Chris Carrier March 17, 1997

March 17, 1997

Some thoughts on the Chatham Islands time of time change. The legal standard time of the Chathams is GMT+12:45, and they observed DST on the same dates as New Zealand, which they are legally tied to. When NZ was making its time changes at 2:00 NZ time, the Chathams changed at 2:45 Chatham time, which was the same time (14:00 GMT of the previous day in both places). Since NZ just changed at 1:00, I would presume the change in the Chathams was at 1:45. Chris Carrier

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proposed tz patch for New Zealand, Israel
by Paul Eggert March 17, 1997

March 17, 1997

Here are proposed patches to the tz database for the recent minor change to the New Zealand rules reported by Jeffrey Connell. I'm also taking the liberty of proposing to regularize the formatting of the recent changes for Israel, along with one substantive change for Israel: a simpler and hopefully more accurate (though still undoubtedly incorrect) prediction for Israeli DST rules from 1999 on. (The existing prediction here seems to be based on the old late-1980s Israeli rules, and it stops after 2009.) =================================================================== RCS file: RCS/australasia,v retrieving revision 1997.1 retrieving revision 1997.1.1.1 diff -c -r1997.1 -r1997.1.1.1 *** australasia 1997/01/21 14:11:10 1997.1 --- australasia 1997/03/16 07:24:58 1997.1.1.1 *************** *** 305,313 **** Rule NZ 1990 max - Oct Sun>=1 2:00s 1:00 D Rule NZ 1975 only - Feb 23 2:00s 0 S Rule NZ 1976 1989 - Mar Sun>=1 2:00s 0 S ! Rule NZ 1990 max - Mar Sun>=15 2:00s 0 S Rule Chatham 1990 max - Oct Sun>=1 2:45s 1:00 D ! Rule Chatham 1991 max - Mar Sun>=15 2:45s 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Auckland 11:39:04 - LMT 1868 11:30 NZ NZ%sT 1940 Sep 29 2:00 --- 305,315 ---- Rule NZ 1990 max - Oct Sun>=1 2:00s 1:00 D Rule NZ 1975 only - Feb 23 2:00s 0 S Rule NZ 1976 1989 - Mar Sun>=1 2:00s 0 S ! Rule NZ 1990 1996 - Mar Sun>=15 2:00s 0 S ! Rule NZ 1997 max - Mar Sun>=15 2:00 0 S Rule Chatham 1990 max - Oct Sun>=1 2:45s 1:00 D ! Rule Chatham 1991 1996 - Mar Sun>=15 2:45s 0 S ! Rule Chatham 1997 max - Mar Sun>=15 2:45 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Auckland 11:39:04 - LMT 1868 11:30 NZ NZ%sT 1940 Sep 29 2:00 *************** *** 832,837 **** --- 834,850 ---- # gives the NZ rules but with transitions at 2:45 local standard time. # Guess that they adopted DST in 1990. + # From "J. Sean Connell" <ankh(a)canuck.gen.nz> (1997-03-16): + # As I sit here and change all my other clocks, I would like to let y'all know + # that New Zealand changed its DST rules this year; instead of NZDT 02:59:59 + # becoming NZST 02:00:00, NZDT 01:59:59 now -> NZST 01:00:00. I'm afraid that + # I can't point you to any confirmatory articles, but apparently it was only + # decided a few weeks ago. + # + # From Paul Eggert (1997-03-15): + # We'll assume Chatham followed suit. + + ############################################################################### # Fiji =================================================================== RCS file: RCS/asia,v retrieving revision 1997.3 retrieving revision 1997.3.1.1 diff -c -r1997.3 -r1997.3.1.1 *** asia 1997/03/04 14:58:18 1997.3 --- asia 1997/03/16 07:24:58 1997.3.1.1 *************** *** 508,515 **** # From Ephraim Silverberg (ephraim(a)cs.huji.ac.il) 1997-03-04: - # Zone Information Compiler (ZIC) File for the State of Israel (1989-2009) - # According to the Office of the Secretary General of the Ministry of # Interior, there is NO set rule for Daylight-Savings/Standard time changes. # Each year they decide anew what havoc to wreak on the country. However, --- 508,513 ---- *************** *** 525,551 **** # change back to standard time took place on Sunday night instead of Saturday # night to avoid conflicts with the Jewish New Year. ! # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1989 only - Apr 30 0:00 1:00 D ! Rule Zion 1989 only - Sep 3 0:00 0:00 S ! Rule Zion 1990 only - Mar 25 0:00 1:00 D ! Rule Zion 1990 only - Aug 26 0:00 0:00 S ! Rule Zion 1991 only - Mar 24 0:00 1:00 D ! Rule Zion 1991 only - Sep 1 0:00 0:00 S ! Rule Zion 1992 only - Mar 29 0:00 1:00 D ! Rule Zion 1992 only - Sep 6 0:00 0:00 S ! Rule Zion 1993 only - Apr 2 0:00 1:00 D ! Rule Zion 1993 only - Sep 5 0:00 0:00 S # The dates for 1994-1995 were obtained from Office of the Spokeswoman for the # Ministry of Interior, Jerusalem, Israel. The spokeswoman can be reached by # calling the office directly at 972-2-6701447 or 972-2-6701448. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! 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 - Sep 3 0:00 0:00 S # The dates for 1996 were determined by the Minister of Interior of the # time, Haim Ramon. The official announcement regarding 1996-1998 --- 523,549 ---- # change back to standard time took place on Sunday night instead of Saturday # night to avoid conflicts with the Jewish New Year. ! # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1989 only - Apr 30 0:00 1:00 D ! Rule Zion 1989 only - Sep 3 0:00 0 S ! Rule Zion 1990 only - Mar 25 0:00 1:00 D ! Rule Zion 1990 only - Aug 26 0:00 0 S ! Rule Zion 1991 only - Mar 24 0:00 1:00 D ! Rule Zion 1991 only - Sep 1 0:00 0 S ! Rule Zion 1992 only - Mar 29 0:00 1:00 D ! Rule Zion 1992 only - Sep 6 0:00 0 S ! Rule Zion 1993 only - Apr 2 0:00 1:00 D ! Rule Zion 1993 only - Sep 5 0:00 0 S # The dates for 1994-1995 were obtained from Office of the Spokeswoman for the # Ministry of Interior, Jerusalem, Israel. The spokeswoman can be reached by # calling the office directly at 972-2-6701447 or 972-2-6701448. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1994 only - Apr 1 0:00 1:00 D ! Rule Zion 1994 only - Aug 28 0:00 0 S ! Rule Zion 1995 only - Mar 31 0:00 1:00 D ! Rule Zion 1995 only - Sep 3 0:00 0 S # The dates for 1996 were determined by the Minister of Interior of the # time, Haim Ramon. The official announcement regarding 1996-1998 *************** *** 560,599 **** # # ftp://ftp.huji.ac.il/pub/tz/announcements/1997.ps.gz # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1996 only - Mar 15 0:00 1:00 D ! Rule Zion 1996 only - Sep 16 0:00 0:00 S ! Rule Zion 1997 only - Mar 21 0:00 1:00 D ! Rule Zion 1997 only - Sep 14 0:00 0:00 S ! Rule Zion 1998 only - Mar 20 0:00 1:00 D ! Rule Zion 1998 only - Oct 18 0:00 0:00 S ! ! # These rules are probably wrong, but they are close approximations (usually ! # within a few weeks): ! ! # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1999 only - Apr 11 0:00 1:00 D ! Rule Zion 1999 only - Sep 5 0:00 0:00 S ! Rule Zion 2000 only - Apr 30 0:00 1:00 D ! Rule Zion 2000 only - Sep 24 0:00 0:00 S ! Rule Zion 2001 only - Apr 15 0:00 1:00 D ! Rule Zion 2001 only - Sep 9 0:00 0:00 S ! Rule Zion 2002 only - Apr 7 0:00 1:00 D ! Rule Zion 2002 only - Sep 1 0:00 0:00 S ! Rule Zion 2003 only - Apr 27 0:00 1:00 D ! Rule Zion 2003 only - Sep 21 0:00 0:00 S ! Rule Zion 2004 only - Apr 18 0:00 1:00 D ! Rule Zion 2004 only - Sep 12 0:00 0:00 S ! Rule Zion 2005 only - May 1 0:00 1:00 D ! Rule Zion 2005 only - Sep 25 0:00 0:00 S ! Rule Zion 2006 only - Apr 23 0:00 1:00 D ! Rule Zion 2006 only - Sep 17 0:00 0:00 S ! Rule Zion 2007 only - Apr 15 0:00 1:00 D ! Rule Zion 2007 only - Sep 9 0:00 0:00 S ! Rule Zion 2008 only - Apr 27 0:00 1:00 D ! Rule Zion 2008 only - Sep 21 0:00 0:00 S ! Rule Zion 2009 only - Apr 19 0:00 1:00 D ! Rule Zion 2009 only - Sep 13 0:00 0:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Jerusalem 2:20:56 - LMT 1880 --- 558,577 ---- # # ftp://ftp.huji.ac.il/pub/tz/announcements/1997.ps.gz + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Zion 1996 only - Mar 15 0:00 1:00 D + Rule Zion 1996 only - Sep 16 0:00 0 S + Rule Zion 1997 only - Mar 21 0:00 1:00 D + Rule Zion 1997 only - Sep 14 0:00 0 S + Rule Zion 1998 only - Mar 20 0:00 1:00 D + Rule Zion 1998 only - Oct 18 0:00 0 S + + # From Paul Eggert (1997-03-15): + # Here are guesses for rules after 1998. + # They are probably wrong, but they are more likely than no DST at all. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S ! Rule Zion 1999 max - Mar Fri>=15 0:00 1:00 D ! Rule Zion 1999 max - Sep Sun>=15 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Jerusalem 2:20:56 - LMT 1880

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Daylight savings time in New Zealand
by J. Sean Connell March 15, 1997

March 15, 1997

As I sit here and change all my other clocks, I would like to let y'all know that New Zealand changed its DST rules this year; instead of NZDT 02:59:59 becoming NZST 02:00:00, NZDT 01:59:59 now -> NZST 01:00:00. I'm afraid that I can't point you to any confirmatory articles, but apparently it was only decided a few weeks ago... -- Jeffrey Connell | Systems Adminstrator, ICONZ ankh(a)canuck.gen.nz | Any opinions stated above are not my employers', ankh(a)iconz.co.nz | not my boyfriend's, my priest's, my God's, my #include <stddisc.h> | my friends', and probably not even my own. ---------------------------+-------------------------------------------------- Fingerprint: 1024/2B8B116D | Key at http://www.canuck.gen.nz/~ankh/pgpkey.html

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tzcode1997c.tar.gz and tzdata1997d.tar.gz
by ado March 8, 1997

March 8, 1997

The files ftp://elsie.nci.nih.gov/pub/tzcode1997c.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata1997d.tar.gz are now available. Included are changes to "zic.c" to correct performance of the "-s" option, and a new file "usno1997". --ado

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Re: Israel Daylight Time
by Dave Skinner March 6, 1997

March 6, 1997

Regarding time settings in the state of Indiana, I do not know about the stories in the email to which I am now responding. Nevertheless, I grew up in Indianapolis, and I do remember that the first week or so of first grade was spent with the schools on one time-of-day and everyone's homes on a time-o-day that differed by an hour. This would have been in approximately September of 1959 (if I have redetermined the year of my 1st grade tour of duty correctly). Dave Skinner dave(a)jpl.nasa.gov

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Israel Daylight Time
by Chris Carrier March 6, 1997

March 6, 1997

Ephraim Silverberg > INTERNET:ephraim@cs.huji.ac.il wrote: >Yesterday, the Knesset (Israeli parliament) passed a law changing the >daylight savings changeover times for 1997 (a mere ten days from when the >old times were to take effect). >An article from the English-language Jerusalem Post of late January explains >the rational for the change and can be found in: > ftp://ftp.huji.ac.il/users/ephraim/tz/timezone97.ps.gz >Please note that the starting time mentioned in the English-language article >is NOT the time that was finally decided upon by the Knesset. Could you please post the article here? Not all of us have Web access, sadly. >According to the Office of the Secretary General of the Ministry of >Interior, there is NO set rule for Daylight-Savings/Standard time changes. >Each year they decide anew what havoc to wreak on the country. However, >there is a "supposed" set of rules which is subject to change depending >on the party the Minister of Interior, the size of the coalition >government, the phase of the moon and the direction of the wind... Sounds like Indiana in the good old days before the Uniform Time Act where each county had its own time, each city within that county could secede from that, and where a 35-mile stretch of road had seven different sets of rules. I heard an apocrphyal story from Indiana at that time that a city council met on a Saturday evening and decided to cancel DST which was to go into effect at 2 a.m. that night (Sunday morning). The police and fire departments went around all over town late that evening and early next morning broadcasting the change on their bullhorns. Although the 1999-2009 dates do bounce around the Gregorian calendar quite a bit, in the Jewish calendar they are quite consistent: DST begins on the fourth Sunday in Nisan and ends on the first Sunday after Elul 20. (Ran the dates through a program of mine that takes Civil dates and translates them into a number of other calendars, including the Jewish).

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tzdata1997c.tar.gz
by ado March 4, 1997

March 4, 1997

The file http://elsie.nci.nih.gov/pub/tzdata1997c.tar.gz is now available; it incorporates the recently circulated changes in Israel. I'm at work on the "zic -s" challenge. The cleanest way to deal with it seems to be to ignore the "-s" flag when running through the rules and zones, then eliminating "early" transition times when writing out the zone file; doing this provides a way of figuring out what time type should be in effect at the earliest instant to be represented in the file. Substantial regression work will be needed, so stay tuned. --ado

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Changes in Israel's 1997 Daylight Savings Rules (CORRECTION!)
by Ephraim Silverberg March 4, 1997

March 4, 1997

> An article from the English-language Jerusalem Post of late January explains > the rational for the change and can be found in: > > ftp://ftp.huji.ac.il/users/ephraim/tz/timezone97.ps.gz > > Please note that the starting time mentioned in the English-language article > is NOT the time that was finally decided upon by the Knesset. The ZIC file I included in my previous message contained the proposed times (and comments) NOT the real times. Attached is the true ZIC file. 10**6 apologies. ___________________________________________________________________________ Ephraim Silverberg, CS System Group, Phone number: 972-2-6585521 Hebrew University, Jerusalem, Israel. Fax number: 972-2-6585439 WWW: http://www.cs.huji.ac.il/~ephraim E-mail: ephraim(a)cs.huji.ac.il --------------------------------------------------------------------------- # Zone Information Compiler (ZIC) File for the State of Israel (1989-2009) # According to the Office of the Secretary General of the Ministry of # Interior, there is NO set rule for Daylight-Savings/Standard time changes. # Each year they decide anew what havoc to wreak on the country. However, # there is a "supposed" set of rules which is subject to change depending # on the party the Minister of Interior, the size of the coalition # government, the phase of the moon and the direction of the wind. Hence, # changes may need to be made on a semi-annual basis. One thing is entrenched # in law, however: that there must be at least 150 days of daylight savings # time annually. Ever since 1993, the change to daylight savings time is # on a Thursday night from midnight IST to 1 a.m IDT. The change back to # standard time is on a Saturday night from midnight daylight savings time # to 11 p.m. standard time. 1996 is an exception to this rule where the # change back to standard time took place on Sunday night instead of Saturday # night to avoid conflicts with the Jewish New Year. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1989 only - Apr 30 0:00 1:00 D Rule Zion 1989 only - Sep 3 0:00 0:00 S Rule Zion 1990 only - Mar 25 0:00 1:00 D Rule Zion 1990 only - Aug 26 0:00 0:00 S Rule Zion 1991 only - Mar 24 0:00 1:00 D Rule Zion 1991 only - Sep 1 0:00 0:00 S Rule Zion 1992 only - Mar 29 0:00 1:00 D Rule Zion 1992 only - Sep 6 0:00 0:00 S Rule Zion 1993 only - Apr 2 0:00 1:00 D Rule Zion 1993 only - Sep 5 0:00 0:00 S # The dates for 1994-1995 were obtained from Office of the Spokeswoman for the # Ministry of Interior, Jerusalem, Israel. The spokeswoman can be reached by # calling her office directly at 972-2-6701447 or 972-2-6701448. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 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 - Sep 3 0:00 0:00 S # The dates for 1996 were determined by the Minister of Interior of the # time, Mr. Haim Ramon. The official announcement regarding 1996-1998 # (with the dates for 1997 no longer being relevant) can be viewed at: # # ftp://ftp.huji.ac.il/pub/tz/announcements/1996-1998.ramon.ps.gz # # The dates for 1997 were altered by his successor, Rabbi Eli Suissa. # No changes have been made regarding 1998 as of yet. # # The official announcement for the year 1997 can be viewed at: # # ftp://ftp.huji.ac.il/pub/tz/announcements/1997.ps.gz # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1996 only - Mar 15 0:00 1:00 D Rule Zion 1996 only - Sep 16 0:00 0:00 S Rule Zion 1997 only - Mar 21 0:00 1:00 D Rule Zion 1997 only - Sep 14 0:00 0:00 S Rule Zion 1998 only - Mar 20 0:00 1:00 D Rule Zion 1998 only - Oct 18 0:00 0:00 S # These rules are probably wrong, but they are close approximations (usually # within a few weeks): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1999 only - Apr 11 0:00 1:00 D Rule Zion 1999 only - Sep 5 0:00 0:00 S Rule Zion 2000 only - Apr 30 0:00 1:00 D Rule Zion 2000 only - Sep 24 0:00 0:00 S Rule Zion 2001 only - Apr 15 0:00 1:00 D Rule Zion 2001 only - Sep 9 0:00 0:00 S Rule Zion 2002 only - Apr 7 0:00 1:00 D Rule Zion 2002 only - Sep 1 0:00 0:00 S Rule Zion 2003 only - Apr 27 0:00 1:00 D Rule Zion 2003 only - Sep 21 0:00 0:00 S Rule Zion 2004 only - Apr 18 0:00 1:00 D Rule Zion 2004 only - Sep 12 0:00 0:00 S Rule Zion 2005 only - May 1 0:00 1:00 D Rule Zion 2005 only - Sep 25 0:00 0:00 S Rule Zion 2006 only - Apr 23 0:00 1:00 D Rule Zion 2006 only - Sep 17 0:00 0:00 S Rule Zion 2007 only - Apr 15 0:00 1:00 D Rule Zion 2007 only - Sep 9 0:00 0:00 S Rule Zion 2008 only - Apr 27 0:00 1:00 D Rule Zion 2008 only - Sep 21 0:00 0:00 S Rule Zion 2009 only - Apr 19 0:00 1:00 D Rule Zion 2009 only - Sep 13 0:00 0:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Israel 2:00 Zion I%sT

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Changes in Israel's 1997 Daylight Savings Rules
by Ephraim Silverberg March 4, 1997

March 4, 1997

Yesterday, the Knesset (Israeli parliament) passed a law changing the daylight savings changeover times for 1997 (a mere ten days from when the old times were to take effect). Attached is the new Zic file for Israel with the corrected 1997 times. For now, the times for 1998 remain the same and there are no official times for 1999 and on. Please note that I have altered some of the comments as well. The official announcement (in Hebrew) is in the gzipped postscript file: ftp://ftp.huji.ac.il/pub/tz/announcements/1997.ps.gz An article from the English-language Jerusalem Post of late January explains the rational for the change and can be found in: ftp://ftp.huji.ac.il/users/ephraim/tz/timezone97.ps.gz Please note that the starting time mentioned in the English-language article is NOT the time that was finally decided upon by the Knesset. ___________________________________________________________________________ Ephraim Silverberg, CS System Group, Phone number: 972-2-6585521 Hebrew University, Jerusalem, Israel. Fax number: 972-2-6585439 WWW: http://www.cs.huji.ac.il/~ephraim E-mail: ephraim(a)cs.huji.ac.il --------------------------------------------------------------------------- # Zone Information Compiler (ZIC) File for the State of Israel (1989-2009) # According to the Office of the Secretary General of the Ministry of # Interior, there is NO set rule for Daylight-Savings/Standard time changes. # Each year they decide anew what havoc to wreak on the country. However, # there is a "supposed" set of rules which is subject to change depending # on the party the Minister of Interior, the size of the coalition # government, the phase of the moon and the direction of the wind. Hence, # changes may need to be made on a semi-annual basis. One thing is entrenched # in law, however: that there must be at least 150 days of daylight savings # time annually. The change to daylight savings time is from midnight IST # to 1 a.m IDT (day of week varies in different years). The change back to # standard time is on a Saturday night from midnight daylight savings time # to 11 p.m. standard time. 1996 is an exception to this rule where the # change back to standard time took place on Sunday night instead of Saturday # night to avoid conflicts with the Jewish New Year. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1989 only - Apr 30 0:00 1:00 D Rule Zion 1989 only - Sep 3 0:00 0:00 S Rule Zion 1990 only - Mar 25 0:00 1:00 D Rule Zion 1990 only - Aug 26 0:00 0:00 S Rule Zion 1991 only - Mar 24 0:00 1:00 D Rule Zion 1991 only - Sep 1 0:00 0:00 S Rule Zion 1992 only - Mar 29 0:00 1:00 D Rule Zion 1992 only - Sep 6 0:00 0:00 S Rule Zion 1993 only - Apr 2 0:00 1:00 D Rule Zion 1993 only - Sep 5 0:00 0:00 S # The dates for 1994-1995 were obtained from Office of the Spokeswoman for the # Ministry of Interior, Jerusalem, Israel. The spokeswoman can be reached by # calling her office directly at 972-2-6701447 or 972-2-6701448. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 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 - Sep 3 0:00 0:00 S # The dates for 1996 were determined by the Minister of Interior of the # time, Haim Ramon. The dates for 1997 were altered by his successor, # Rabbi Eli Suissa. No changes have been made regarding 1998 as of yet. # # The official announcement for the years 1997 and 1998 can be viewed at: # # ftp://ftp.huji.ac.il/pub/tz/announcements/1997-1998.ps.gz # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1996 only - Mar 15 0:00 1:00 D Rule Zion 1996 only - Sep 16 0:00 0:00 S Rule Zion 1997 only - Mar 23 0:00 1:00 D Rule Zion 1997 only - Sep 14 0:00 0:00 S Rule Zion 1998 only - Mar 20 0:00 1:00 D Rule Zion 1998 only - Oct 18 0:00 0:00 S # These rules are probably wrong, but they are close approximations (usually # within a few weeks): # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 1999 only - Apr 11 0:00 1:00 D Rule Zion 1999 only - Sep 5 0:00 0:00 S Rule Zion 2000 only - Apr 30 0:00 1:00 D Rule Zion 2000 only - Sep 24 0:00 0:00 S Rule Zion 2001 only - Apr 15 0:00 1:00 D Rule Zion 2001 only - Sep 9 0:00 0:00 S Rule Zion 2002 only - Apr 7 0:00 1:00 D Rule Zion 2002 only - Sep 1 0:00 0:00 S Rule Zion 2003 only - Apr 27 0:00 1:00 D Rule Zion 2003 only - Sep 21 0:00 0:00 S Rule Zion 2004 only - Apr 18 0:00 1:00 D Rule Zion 2004 only - Sep 12 0:00 0:00 S Rule Zion 2005 only - May 1 0:00 1:00 D Rule Zion 2005 only - Sep 25 0:00 0:00 S Rule Zion 2006 only - Apr 23 0:00 1:00 D Rule Zion 2006 only - Sep 17 0:00 0:00 S Rule Zion 2007 only - Apr 15 0:00 1:00 D Rule Zion 2007 only - Sep 9 0:00 0:00 S Rule Zion 2008 only - Apr 27 0:00 1:00 D Rule Zion 2008 only - Sep 21 0:00 0:00 S Rule Zion 2009 only - Apr 19 0:00 1:00 D Rule Zion 2009 only - Sep 13 0:00 0:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Israel 2:00 Zion I%sT

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zic -s bug fixes for year/time extremes (found by code inspection)
by Paul Eggert March 3, 1997

March 3, 1997

I briefly looked for a fix for the problem that Dave Sparks reported today with zic.c, and decided that this will require more zic expertise than I have. However, I did find a couple of related bugs in zic.c by code inspection. First, there are a couple of places in the code that compare for equality to min_year, but values less than min_year are possible if -s is given, so these should be changed to compare for not greater than min_year. (While we're at it, we might as well make max_year symmetric.) Second, the setboundaries function sets min_year and max_year based on GMT, but these values are meant to be bounds for localtime years, so to be safe one must subtract 1 from the GMT min year and add 1 to the GMT max year. This is particularly important with the -s option, since the GMT min year is 1970 but the localtime min year might be 1969. Here is a proposed patch. This patch doesn't fix Sparks's bug, unfortunately. 1997-03-02 Paul Eggert <eggert(a)twinsun.com> * zic.c (setboundaries): Set min_year to be one less than GMT min_year, and max_year to be one greater than GMT max_year, in case local time and GMT disagree about years at time boundaries. (outzone, tadd): Don't assume that min_time and max_time are bounds on time_t values, since -s makes this assumption false. =================================================================== RCS file: RCS/zic.c,v retrieving revision 1997.2.1.1 retrieving revision 1997.2.1.2 diff -c -r1997.2.1.1 -r1997.2.1.2 *** zic.c 1997/02/28 00:22:22 1997.2.1.1 --- zic.c 1997/03/03 03:58:26 1997.2.1.2 *************** *** 647,654 **** max_time <<= TIME_T_BITS_IN_FILE - 1; --max_time; } ! min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year; ! max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year; } static int --- 647,654 ---- max_time <<= TIME_T_BITS_IN_FILE - 1; --max_time; } ! min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year - 1; ! max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year + 1; } static int *************** *** 1638,1645 **** if (!rp->r_todisstd) offset = oadd(offset, stdoff); jtime = rp->r_temp; ! if (jtime == min_time || ! jtime == max_time) continue; jtime = tadd(jtime, -offset); if (k < 0 || jtime < ktime) { --- 1638,1645 ---- if (!rp->r_todisstd) offset = oadd(offset, stdoff); jtime = rp->r_temp; ! if (jtime <= min_time || ! jtime >= max_time) continue; jtime = tadd(jtime, -offset); if (k < 0 || jtime < ktime) { *************** *** 1978,1986 **** { register time_t t; ! if (t1 == max_time && t2 > 0) return max_time; ! if (t1 == min_time && t2 < 0) return min_time; t = t1 + t2; if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) { --- 1978,1986 ---- { register time_t t; ! if (t1 >= max_time && t2 > 0) return max_time; ! if (t1 <= min_time && t2 < 0) return min_time; t = t1 + t2; if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {

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