SYS_EXTRACT_UTC(x) converts the TIMESTAMP WITH TIMEZONE x to a TIMESTAMP containing the date and time in UTC. : SYS_EXTRACT_UTC « Date Timestamp Functions « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Date Timestamp Functions
3. SYS_EXTRACT_UTC

SQL>
SQL> SELECT SYS_EXTRACT_UTC(TIMESTAMP '2005-05-13 19:15:26 PST') FROM dual;

SYS_EXTRACT_UTC(TIMESTAMP'2005-05-1319:15:26PST')
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14-MAY-05 02.15.26.000000000 AM

SQL>