setMonth Method
Description
Modifies the month stored in the Date object.Syntax
dateObj.setMonth( numMonth )
Arguments
numMonth: A numeric value equal to the desired minutes value.
Remarks
If the value of numMonth is greater than 11 (remember, January is month 0) or negative, the stored year will be modified accordingly. For example, if the stored date is "Jan 5, 1996" and setMonth(14) is called, the date will be changed to "Mar 5, 1997."