Compare the timestamp value between before and after 'alter session set time_zone'
SQL>
SQL> create table t
2 (c1 timestamp with time zone,
3 c2 timestamp with local time zone)
4 /
Table created.
SQL>
SQL> insert into t (c1,c2)values( current_timestamp, current_timestamp );
1 row created.
SQL>
SQL> select * from t;
C1
---------------------------------------------------------------------------
C2
---------------------------------------------------------------------------
16-JUN-08 05.01.27.439000 PM -08:00
16-JUN-08 05.01.27.439000 PM
1 row selected.
SQL>
SQL> alter session set time_zone = '-08:00';
Session altered.
SQL>
SQL> select * from t;
C1
---------------------------------------------------------------------------
C2
---------------------------------------------------------------------------
16-JUN-08 05.01.27.439000 PM -08:00
16-JUN-08 05.01.27.439000 PM
1 row selected.
SQL>
SQL> drop table t;
Table dropped.
SQL>
SQL> --
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