[tz] Rules for TZ+ database

random832 at fastmail.us random832 at fastmail.us
Fri Sep 6 20:14:57 UTC 2013

On Fri, Sep 6, 2013, at 16:02, Lester Caine wrote:
> When managing sites where users log in from around the world, we log all 
> activity using UTC. That is the only way to do it.

That's fine for logging; the problem is with scheduling future events.

If someone schedules a meeting at (e.g.) noon next January, and between
now and then the state that meeting takes place in switches from (e.g.)
Eastern to Central time, then the program _must not_ move the meeting to
eleven. Which means blindly storing the UTC or blindly storing a
time+offset is inappropriate.

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