Compare time values by using the TIMEDIFF() function: TIMEDIFF(
mysql>
mysql>
mysql>
mysql> SELECT TIMEDIFF('2004-12-31 23:59:59', '2004-12-30 23:59:59');
+--------------------------------------------------------+
| TIMEDIFF('2004-12-31 23:59:59', '2004-12-30 23:59:59') |
+--------------------------------------------------------+
| 24:00:00 |
+--------------------------------------------------------+
1 row in set (0.00 sec)
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