On Tue, 15 Aug 2000, Thomas Carey wrote:
many locales undergo DST transition at midnight - for instance - on Thu 21 Sept 2000 19:30 - DST will end in Tehran, and local time will go from 00:00->23:00 (actually, from 23:59 to 23:00). My question is whether this extra hour occurs (locally) on thursday or friday. I'd assume thursday, as 00:00 doesn't arrive before the transition.
Before 1999, Israel used to change back to standard time at 00:00 (usually on a Saturday night) and this caused massive confusion since there were two 23:00 - 00:00 hours that night. In 1999, at the request of the Airport Authority the time change took place at 02:00 old time to avoid this confusion and having people miss flights because of this.
From 2000 onwards, the change back is slated to take place at 01:00 (why this was changed from 02:00 is beyond me).
Ephraim ___________________________________________________________________________ Ephraim Silverberg, CSE 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@cse.huji.ac.il