.TO_CHAR problem

Hi all,

I want to have some stats from my data grouped by 2hours periodes.

Here is the query :

SELECT TO_DATE(TO_CHAR (date_clic,'DD-MM-YYYY ')
|| (TO_CHAR(
TO_NUMBER(
TO_CHAR(date_clic,'hh24')
, 99)
- mod(
TO_NUMBER(
TO_CHAR(date_clic,'hh24')
, 99)
,2)
, 'hh24')
)
||':00','DD-MM-YYYY HH24:MI') AS date_debut
FROM clic_campagne;

But I only get the date whithout the hours and the minute, how can I get
them ?

Thanx,

Guillaume.