| Oracle® OLAP DML Reference 11g Release 2 (11.2) Part Number E17122-07 | 
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The DBTIMEZONE function returns the value of the Database time zone.
A time zone offset (a character type in the format '[+|-]TZH:TZM') or a time zone region name, depending on how the user specified the database time zone value in the most recent CREATE DATABASE or ALTER DATABASE statement.
DBTIMEZONE