du kan prøve dette:
SELECT TO_CHAR(yourval, 'DD-MON-YYYY HH:MI:SS') FROM yourtable;
SELECT TO_CHAR(yourval, 'HH:MI:SS') FROM yourtable;
Rediger: som @steven påpegede, at have 24 timers stilbrug
SELECT TO_CHAR(yourval, 'HH24:MI:SS') FROM yourtable;