YouTipJsref Setdate
# JavaScript setDate() Method
[ JavaScript Date Object](#)
## Example
Set a day of the month:
var d = new Date();
d.setDate(15);
The output of _d_:
Mon Jun 15 2026 01:18:28 GMT+0000 (Coordinated Universal Time)
[Try it Yourself »](#)
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## Definition and Usage
The setDate() method is used to set the day of the month.
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## Browser Support
The setDate() method is supported by all major browsers.
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## Syntax
_Date_.setDate(_day_)
## Parameter Values
| Parameter | Description |
| :--- | :--- |
| _day_ | Required. A number representing the day of the month (1 - 31): * 0 will result in the last day of the previous month. * -1 will result in the day before the last day of the previous month. If the current month has 31 days: * 32 will result in the first day of the next month. If the current month has 30 days: * 32 will result in the second day of the next month. |
## Return Value
| Type | Description |
| --- | --- |
| Number | The number of milliseconds between January 1, 1970, midnight, and the adjusted date. Before ECMAScript standardization, this method returned nothing. |
## Technical Details
| JavaScript Version: | 1.0 |
| --- |
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## More Examples
## Example
Set a day of the month to the last day of the previous month:
var d = new Date();
d.setDate(0);
The output of _d_:
Sun May 31 2026 01:18:28 GMT+0000 (Coordinated Universal Time)
[Try it Yourself »](#)
## Example
In this example, we will set the day of the current month to 15 using the setDate() method:
var d = new Date("July 21, 1983 01:15:00");
d.setDate(15);
The output of _d_:
Fri Jul 15 1983 01:15:00 GMT+0000 (Coordinated Universal Time)
[Try it Yourself »](#)
* * JavaScript Date Object](#)