[GENERAL] 6.4.2 and 6.5 date usertype difference

I have just replicated a db in 6.5 from 6.4.2.

The table selects the date differently from the identical table.
I obviously set a parameter in 6.4.2 which I now cannot find (from
mail list archive and doc as well).

Please aid someone who is tearing his hair out.
Thank you in advance,
Colin.

The table & contents :
     CREATE TABLE JUNK_QWERTY (
       id       int,
       mydate   date
     );
     insert into JUNK_QWERTY values (1, '1999-02-01');
     insert into JUNK_QWERTY values (2, '1999-03-24');
     insert into JUNK_QWERTY values (3, '1999-11-24');

6.4.2 output :
    timesheet=> select * from JUNK_QWERTY;
        id|    mydate
        --+----------
         1|1999-02-01
         2|1999-03-24
         3|1999-11-24
        (3 rows)

6.5 output :
    timesheet=> select * from JUNK_QWERTY;
        id|    mydate
        --+----------
         1|02-01-1999
         2|03-24-1999
         3|11-24-1999
        (3 rows)

==============================================================
==============================================================
6.4.2 version :
    timesheet=> select version();
        version

-------------------------------------------------------------
        PostgreSQL 6.4.2 on i586-pc-linux-gnu, compiled by gcc
2.7.2.

6.5 version :
    timesheet=> select version();
        version

--------------------------------------------------------------
        PostgreSQL 6.5.0 on i686-pc-linux-gnu, compiled by gcc
2.7.2.3
        (1 row)