Вы можете использовать функцию STR_TO_DATE -
SELECT STR_TO_DATE('11/03/2002 02:45:33 PM', '%d/%m/%Y %h:%i:%s %p') AS dt;
+---------------------+
| dt |
+---------------------+
| 2002-03-11 14:45:33 |
+---------------------+
или
SELECT STR_TO_DATE('11/03/2002 02:45:33 PM', '%d/%m/%Y %r') AS dt;
+---------------------+
| dt |
+---------------------+
| 2002-03-11 14:45:33 |
+---------------------+