Date.prototype.setMonth()
The setMonth()
method sets the month for a specified date according to the currently set year.
Syntax
<var>dateObj</var>.setMonth(<var>monthValue</var>[, <var>dayValue</var>])
Versions prior to JavaScript 1.3
<var>dateObj</var>.setMonth(<var>monthValue</var>)
Parameters
monthValue
- An integer between 0 and 11, representing the months January through December.
dayValue
- Optional. An integer from 1 to 31, representing the day of the month.
Return value
The number of milliseconds between 1 January 1970 00:00:00 UTC and the updated date.
Description
If you do not specify the dayValue
parameter, the value returned from the getDate()
method is used.
If a parameter you specify is outside of the expected range, setMonth()
attempts to update the date information in the Date
object accordingly. For example, if you use 15 for monthValue
, the year will be incremented by 1, and 3 will be used for month.
The current day of month will have an impact on the behaviour of this method. Conceptually it will add the number of days given by the current day of the month to the 1st day of the new month specified as the parameter, to return the new date. For example, if the current value is 31st August 2016, calling setMonth with a value of 1 will return 2nd March 2016. This is because in 2016 February had 29 days.
Examples
Using setMonth()
var theBigDay = new Date(); theBigDay.setMonth(6); //Watch out for end of month transitions var endOfMonth = new Date(2016, 7, 31); endOfMonth.setMonth(1); console.log(endOfMonth); //Wed Mar 02 2016 00:00:00
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
ECMAScript 5.1 (ECMA-262) The definition of 'Date.prototype.setMonth' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Date.prototype.setMonth' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Date.prototype.setMonth' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/date/setmonth