Update Time where Date already exists

Question

Hi,
When i am trying to update time in the column where date already exists, i tried using the update query, but time is not getting updated.
UPDATE ABC SET ATTRIBUTE=TO_DATE('09/30/2011 12:00:00 AM','MM/DD/YYYY HH:MI:SS')
Attribute = 9/30/2011 (As per current record in DB) and i want to add time also..
So when i try updating the record, i dont get any errors, but the time does not get updated, can any one help me for this issue.???
Datatype of Attribute is Varchar2(150)
Thanks

Answer 1

Is there anyway to update a record throgh TO_CHAR function???
SQL> @test
SQL> create table abc (Attribute Varchar2(150));
Table created.
SQL> insert into abc values('09/30/2011');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from abc;
ATTRIBUTE
09/30/2011
SQL> UPDATE ABC SET ATTRIBUTE=to_char(sysdate,'YYYY_MM_DD HH24:MI:SS');
1 row updated.
SQL> COMMIT;
Commit complete.
SQL> select * from abc;
ATTRIBUTE
2011_03_06 19:59:37
SQL> drop table abc;
Table dropped.
SQL>