mysql> create table z (d datetime);
Query OK,  0  rows affected ( 0 . 20  sec)

mysql> insert into z values ('04.09.2003'); 
Query OK,  1  row affected ( 0 . 05  sec)

mysql> select * from z \G
***************************  1 . row ***************************
d:  0000 - 00 - 00   00 : 00 : 00 
 1  row in set ( 0 . 00  sec)

mysql>  insert into z values ('2003-09-04');
Query OK,  1  row affected ( 0 . 00  sec)
mysql> select * from z \G

***************************  1 . row ***************************
d:  2003 - 09 - 04   00 : 00 : 00 
 1  row in set ( 0 . 00  sec)

mysql> select * from z where d > '2003-01-01'\G
***************************  1 . row ***************************
d:  2003 - 09 - 04   00 : 00 : 00 
 1  row in set ( 0 . 00  sec)