Question

In MySQL, how you convert time in AM / PM to minute after midnight format.
EG:- 1. 8:40 AM will be 520
2. 9:00 PM will be 1260

Thanks

Answer 1

First convert the string to a date with STR_TO_DATE(), then do the calculation with HOUR() and MINUTE() functions:

SELECT HOUR(STR_TO_DATE('8:40 AM', '%l:%i %p')) * 60 +
  MINUTE(STR_TO_DATE('8:40 AM', '%l:%i %p')) AS minutes

Results in:

minutes
---------
520

And …

SELECT HOUR(STR_TO_DATE('9:00 PM', '%l:%i %p')) * 60 +
  MINUTE(STR_TO_DATE('9:00 PM', '%l:%i %p')) AS minutes

Results in:

minutes
---------
1260