Time zone: the next generation

Ephraim Silverberg ephraim at cse.huji.ac.il
Sun Mar 6 06:53:27 UTC 2005

On Thu, 3 Mar 2005, Olson, Arthur David (NIH/NCI) wrote:

> * Transitions in Israel
>   Israel now goes back to standard time in the fall on the Saturday
>   before Yom Kippur; there's no convenient way to represent this in
>   the input to zic.

On Sat, 5 Mar 2005, Ken Pizzini wrote:

>    name:Asia/Jerusalem
>    clock:UTC
>    valid_start:53795
>    valid_end:open
>    standard_abbr:IST
>    standard_offset:+7200
>    daylight_abbr:IDT
>    daylight_offset:+10800
>    daylight_start_day:dow=5 & ((mon=4g & mday=1g) | (mon=3g & 25g<mday))
>    daylight_start_time:0
>    daylight_end_day:dow=5 & mon=1H & 1H < mday & mday<9H
>    daylight_end_time:82800
> Note that while in Israel the daylight_end_day would be on the
> *Saturday* (dow=6) preceding 10 Tishri (2H<mday & mday<10H),

Please note that it is the Saturday _night_ before Yom Kippur -- i.e.
in reality (and this is what is stated in the final wording of the law),
the last _Sunday_ before Yom Kippur at 02:00 a.m.

Moreover, please note that Iran uses the Persian calendar for both the
starting and end dates of Daylight Saving Time so that calendar too
would have to be part of the software.
Ephraim Silverberg, CSE System Group,        Phone number:    972-2-6585521
Hebrew University, Jerusalem, Israel.        Fax number:      972-2-5617723
WWW: http://www.cs.huji.ac.il/~ephraim       E-mail: ephraim at cse.huji.ac.il

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