Here\'s what SQL Develoepr is giving me, both in the results window and when I export:
CREATION_TIME ------------------- 27-SEP-12 27-SEP-12 27-SEP-1
Date format can also be set by using below query :-
alter SESSION set NLS_DATE_FORMAT = 'date_format'
e.g. : alter SESSION set NLS_DATE_FORMAT = 'DD-MM-YYYY HH24:MI:SS'