Greetings, It seems we found an error in Israel DST transition for the year 1988. Please check if I'm right and correct me it I'm wrong. This is the current information for the year, the transition has happened according to this on Friday night, changing to Saturday. $ zdump -v Israel | grep 1988 Israel Fri Apr 8 21:59:59 1988 UTC = Fri Apr 8 23:59:59 1988 IST isdst=0 gmtoff=7200 Israel Fri Apr 8 22:00:00 1988 UTC = Sat Apr 9 01:00:00 1988 IDT isdst=1 gmtoff=10800 Israel Fri Sep 2 20:59:59 1988 UTC = Fri Sep 2 23:59:59 1988 IDT isdst=1 gmtoff=10800 Israel Fri Sep 2 21:00:00 1988 UTC = Fri Sep 2 23:00:00 1988 IST isdst=0 gmtoff=7200 I check the Parliament ( Knesset ) records and there it's stated that the transition should take place on Saturday night, when the Sabbath ends and changes to Sunday. The definition in the source file is as follows: Rule Zion 1988 only - Apr 9 0:00 1:00 D Rule Zion 1988 only - Sep 3 0:00 0 S Which result with the times above. When changing the source to be: Rule Zion 1988 only - Apr 10 0:00 1:00 D Rule Zion 1988 only - Sep 4 0:00 0 S And compiling it with zic we get $ zdump -v Israel | grep 1988 Israel Sat Apr 9 21:59:59 1988 UTC = Sat Apr 9 23:59:59 1988 IST isdst=0 gmtoff=7200 Israel Sat Apr 9 22:00:00 1988 UTC = Sun Apr 10 01:00:00 1988 IDT isdst=1 gmtoff=10800 Israel Sat Sep 3 20:59:59 1988 UTC = Sat Sep 3 23:59:59 1988 IDT isdst=1 gmtoff=10800 Israel Sat Sep 3 21:00:00 1988 UTC = Sat Sep 3 23:00:00 1988 IST isdst=0 gmtoff=7200 And the transition is as decided by the parliament on Saturday night toward Sunday. I also added the following lines to the source file Link Asia/Jerusalem Israel Link Asia/Jerusalem IST-2IDT Please check me out and if I'm right, correct the next release of the tzdata file. I don't know how many people and organizations are still interested in data from 1988, but the record should be set right. Thanks in advance. -- Best Regards, Avigdor ---- Email: AvigdorFin@g <Avigdor.Finkelstein@tangram-soft.co.il>mail.com ISRAEL