time_to_sec
description
Syntax
INT time_to_sec(TIME datetime)
参数为Datetime类型 将指定的时间值转为秒数，即返回结果为：小时×3600 + 分钟×60 + 秒。
example
mysql >select current_time(),time_to_sec(current_time());
+----------------+-----------------------------+
| current_time() | time_to_sec(current_time()) |
+----------------+-----------------------------+
| 16:32:18 | 59538 |
+----------------+-----------------------------+
1 row in set (0.01 sec)keywords
TIME_TO_SEC