setMonth Method

Sets the month value in the Date object using local time.

function setMonth(numMonth : Number [, dateVal : Number]) 


  • numMonth
    Required. A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.

  • dateVal
    Optional. A numeric value that represents the day of the month. If this value is not supplied, the value from a call to the getDate method is used.


To set the month value using Coordinated Universal Time (UTC), use the setUTCMonth method.

If the value of numMonth is greater than 11 (January is month 0) or is a negative number, the stored year is modified accordingly. For example, if the stored date is "Jan 5, 1996" and setMonth(14) is called, the date is changed to "Mar 5, 1997."

The setFullYear method can be used to set the year, month, and day of the month.


The following example illustrates the use of the setMonth method.

function SetMonthDemo(newmonth){
    var d = new Date();

    var s = d.toLocaleString(); 


Version 1

Applies To:

Date Object

See Also


getMonth Method

getUTCMonth Method

setUTCMonth Method