JavaScript Date setMonth()
More "Try it Yourself" examples below.
Definition and Usage
The setMonth() method sets the month of a date object.
Note: January is 0, February is 1, and so on.
This method can also be used to set the day of the month.
Browser Support
setMonth() is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
Syntax
Date.setMonth(month, day)
Parameter Values
| Parameter | Description |
|---|---|
| month | Required. An integer representing the month
Expected values are 0-11, but other values are allowed:
|
| day | Optional. An integer representing the day of month
Expected values are 1-31, but other values are allowed:
If the month has 31 days:
If the month has 30 days:
|
Technical Details
| Return Value: | A Number, representing the number of milliseconds between the date object and midnight January 1 1970 |
|---|---|
| JavaScript Version: | ECMAScript 1 |
More Examples
Example
Set the month to 4 (May) and the day to 20:
const d = new Date();
d.setMonth(4, 20);
Try it Yourself »
Example
Set the date to the last day of last month:
const d = new Date();
d.setMonth(d.getMonth(), 0);
Try it Yourself »
