Operator Scope of Action:
Operator First Added:
returns the Number of whole months that have elapsed between date1 and date2. If date2 is earlier than date1 then the result is negative.
If $DateA is 3 January 2016 and $DateB is 9 April 2016, then:
$MyNumber = months($DateA,$DateB);
sets $MyNumber to 4.
Also see days(date1,date2).