easy question: when dst transition occurs at 00:00 hours...

Ephraim Silverberg ephraim at cs.huji.ac.il
Wed Aug 16 15:30:10 UTC 2000

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 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 at cse.huji.ac.il

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