problems with timestamp fields

Hi,
  I'm sure the following is a bug in my understanding rarther than the code,
but I can't find anywhere in the docs that goes into enough deatails for me
to understand.

I think it's something to do with the timezone bit in the timestamp fields,
but I don't know how to fix it.

I've got a table that holds

RMS=# select * from bookings where resid=205;
 bookid | resid | userid |    start_date_time     |     end_date_time      |
confirmed | cancelled |      booked_date
--------+-------+--------+------------------------+------------------------+
-----------+-----------+------------------------
   2010 |   205 | 22     | 2001-05-26 13:00:00+01 | 2001-05-26 14:00:00+01 |
N         | N         | 2001-05-13 10:51:18+01
   2011 |   205 | 22     | 2001-05-26 13:00:00+01 | 2001-05-26 14:00:00+01 |
N         | N         | 2001-05-13 10:51:56+01
(2 rows)




When I run this query against it, it returns nothing.

               SELECT
                        MIN(TO_CHAR(start_date_time, 'yyyy:mm:dd:hh24:mi')),
                        MAX(TO_CHAR(end_date_time,'yyyy:mm:dd:hh24:mi'))
                FROM
                        bookings
                WHERE
                        resid = '205'
                AND
                        end_date_time > TO_DATE( '2001:05:26:13:00:00',
'yyyy:mm:dd:hh24:mi:ss')
                AND
                        start_date_time < TO_DATE( '2001:05:26:14:00:00',
'yyyy:mm:dd:hh24:mi:ss')
 min | max
-----+-----
     |
(1 row)


It should have returned any reccords that overlapped, i.e. 2001-05-26
13:00:00, and 2001-05-26 14:00:00


What am I doing wrong ?

Thanks.