There are requests to implement Time zones in Firebird:

http://tracker.firebirdsql.org/browse/CORE-694
http://tracker.firebirdsql.org/browse/CORE-909

These two are in the "Optional features" list for Firebird 4:
https://www.firebirdsql.org/en/planning-board/


Best Regards

Stefan



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Stefan Heymann, Tübingen, Germany