Scn_to_timestamp and Timestamp_to_scn

SQL> select current_scn,to_char(sysdate,'yyyy/mm/dd hh24:mi:ss') from v$database;

CURRENT_SCN TO_CHAR(SYSDATE,'YY

----------- -------------------

12529246 2012/06/18 13:14:19

SQL> select scn_to_timestamp(12529246) from dual;

SCN_TO_TIMESTAMP(12529246)

---------------------------------------------------------------------------

18-JUN-12 01.14.18.000000000 PM

SQL> select systimestamp from dual;

SYSTIMESTAMP

---------------------------------------------------------------------------

18-JUN-12 01.16.01.146523 PM +08:00

SQL> select timestamp_to_scn(to_timestamp('18-JUN-12 01.16.01.146523 PM')) from dual;

TIMESTAMP_TO_SCN(TO_TIMESTAMP('18-JUN-1201.16.01.146523PM'))

------------------------------------------------------------

12529314

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scn timestamp