Re: format-time-string (was Re: time format on message citation line)

[Katsumi Yamaoka <yamaoka@jpl.org>]

Eric S Fraga wrote:
> Andreas Schwab wrote:
>> $ TZ=Australia/Adelaide date +%z
>> +0930
> $ TZ=Asia/Kathmandu date +%z
> +0545

Oh, what precise verniers they use!  I realized it is not rare
to set a zone info in units of 15 minutes.  Thanks.  I'm going
to simply remove the filter `(zerop (% tz 3600))'.

(`TZ=Mideast/Riyadh87 date +%z' returns +0307, but it's never
 been used, hasn't it?)

I'm still not sure whether the alternative function works correctly
against switching the summer time.  Folks who live in PST/PDT,
MST/MDT, CST/CDT, EST/EDT, etc., how about the following?

> But I have a question about the summer time (daylight saving time).
> Is a computer clock adjusted automatically when the summer time
> starts and ends?  If so, does the return value of (current-time-zone)
> switch when the day comes?  Otherwise, do people who live in such
> region have to alter the TZ environment variable manually (twice in
> a year)?

Thanks.