[tz] Rules for TZ+ database

Guy Harris guy at alum.mit.edu
Thu Sep 5 20:10:14 UTC 2013

On Sep 5, 2013, at 12:48 PM, Lester Caine <lester at lsces.co.uk> wrote:

> Which is why the location of every event is important, the housekeeping going forward has to take care of the change of time of an event. If this is an international event in Casablanca then all of the other delegates need to be informed of the time change THAT is the reason for normalized times. If it is now an hour earlier or later flight bookings may need changing! Information about the CHANGE is critical for a number of reasons.

As you note, the location of every event is important, so any database of events that needs to compensate for time shifts would need to keep the location of the event - in some form *other* than a tzid, in case the time shift is due to a regional split and the event is now in a region with a *different* tzid - and keep a UTC version of the event date/time (and perhaps also the local time version) and, when the software is informed that the tzdb has changed, re-determine the local time and inform the attendees that the local time is different.

The only information about the change that's needed there is that the change happened.

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