Oracle PL/SQL Tutorial/Date Timestamp Functions/FROM TZ

FROM_TZ(x, time_zone) converts the TIMESTAMP x and time zone specified by time_zone to a TIMESTAMP WITH TIMEZONE.

SQL>
SQL> SELECT FROM_TZ(TIMESTAMP "2005-05-13 07:15:31.1234", "EST")
  2  FROM dual;
FROM_TZ(TIMESTAMP"2005-05-1307:15:31.1234","EST")
---------------------------------------------------------------------------
13-MAY-05 07.15.31.123400000 AM EST
SQL>