- display the time zone offset (ahead/behind UTC) for the time zone


select tz_offset('Asia/Seoul')

    , tz_offset('us/eastern')

    , tz_offset('-02:00')

    , tz_offset(sessiontimezone)

    , tz_offset(dbtimezone)

from dual;


select tz_offset('sessiontimezone') from dual;

==> 오류: ORA-01882: 시간대 영역을 찾을 수 없습니다.


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