time zone object
eggert at twinsun.com
Tue Sep 30 01:15:12 UTC 1997
Date: Mon, 29 Sep 1997 16:59:50 -0700 (PDT)
From: ncm at cantrip.org (Nathan Myers)
we also need to ... specify caching of retrieved information with
preference for the cached data up to an expiry date. This requires
representing the expiry date in the cached file.
I don't think it's realistic to insist on an expiry date for time zone rules.
In practice, these rules can change with very little notice. For example,
last year the Sri Lankan government gave less than 24 hours' notice
of an emergency rule change that moved the clocks ahead by an hour.
See ``Sri Lanka advances clock by an hour to avoid blackout'',
In general, time zone rules are ``until further notice'',
and any automated system for propagating time zone rules
will just have to take this into account.
More information about the tz