MySQL in a Nutshell

Name

TIME_TO_SEC( )

Synopsis

TIME_TO_SEC(time)

This function returns the number of seconds that the given time represents. This function is the inverse of SEC_TO_TIME().

SELECT TIME_TO_SEC('01:00')
          AS 'Seconds up to 1 a.m.';
+----------------------+
| Seconds up to 1 a.m. |
+----------------------+
|                 3600 |
+----------------------+

Here we're calculating the number of seconds up until the time of 1 a.m. (i.e., 60 seconds times 60 minutes) or one hour into the day.