months_between

Returns the number of months from "date_expression1" to "date_expression2". If "date_expression1" is later than "date_expression2" then the result will be a positive number. The days and time portion of the difference are ignored, so the months are not rounded unless "date_expression1" and "date_expression2" are the last days of a month.

months_between ( date_expression1 , date_expression2 )