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You have a good point. There is a frustrating trade-off, in that “numeric pseudo-timezones” are pretty portable. The named (Olson) timezones still won’t work everywhere, unfortunately, although the situation is improving.

If portability is not a concern, and the Olson names work on your system, you should definitely use them. If you need to be portable and to deal with all the intricacies of daylight saving time, you probably have to use DateTime with DateTime::TimeZone (which parses the Olson database) and install a copy of the Olson database if your system doesn't already have it.

(Unless there's a better way that I don't know about?)

Update: Actually I think the module is distributed with a pre-parsed copy of the database, so at least you don't have to worry about that. It's still a lumbering behemoth whose documentation is rather confusing, at least to me; but it should give accurate results at least.

In reply to Re^3: How to convert time from one time zone to another by robin
in thread How to convert time from one time zone to another by rameshps

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