TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2)

返回日期或日期時間表達式datetime_expr1 和 datetime_expr2 之間的整數差，結果的單位是由該單元參數給出。單位的合法值的說明與在TIMESTAMPADD()函數列出相同。

mysql> SELECT TIMESTAMPDIFF(MONTH,'2003-02-01','2003-05-01');
+---------------------------------------------------------+
| TIMESTAMPDIFF(MONTH,'2003-02-01','2003-05-01')          |
+---------------------------------------------------------+
| 3                                                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)