Question

I am new to sql and programming so please bear with me. Is there a function in mysql that gets the number of days in a month? Example if the month is February and the year 2012 it should return 29. Thanks in advance.

Answer 1

There’s no direct “last day of month”, but you can fake it by doing a day(last_day())

mysql> select last_day('2012-02-22'), day(last_day('2012-02-22'));
+------------------------+-----------------------------+
| last_day('2012-02-22') | day(last_day('2012-02-22')) |
+------------------------+-----------------------------+
| 2012-02-29             |                          29 | 
+------------------------+-----------------------------+
1 row in set (0.00 sec)

last_day() returns the full date of the last day in in the year/month of a specified date, so you then simply use day() to extract the day of that last_day.

MySQL’s date/time functions documentation is here: http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html