MySQL string to date function

Ref. http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_str-to-date

mysql> SELECT STR_TO_DATE('01,5,2013','%d,%m,%Y');
        -> '2013-05-01'
mysql> SELECT STR_TO_DATE('May 1, 2013','%M %d,%Y');
        -> '2013-05-01'