title: Modify timestamp in datatime field in DB2
body: <p>Is there a way to modify the timestamp alone for an existing datetime attribute, for example changedate currently holds the value <code>2002-10-18 00:00:00.0</code> and would like to change it to <code>2002-10-18 08:00:00.0</code> The date would remain the same and time would only change.</p>