-
Notifications
You must be signed in to change notification settings - Fork 22.4k
/
index.md
59 lines (39 loc) · 2.2 KB
/
index.md
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
---
title: Date.prototype.setDate()
slug: Web/JavaScript/Reference/Global_Objects/Date/setDate
page-type: javascript-instance-method
browser-compat: javascript.builtins.Date.setDate
---
{{JSRef}}
The **`setDate()`** method of {{jsxref("Date")}} instances changes the day of the month for this date according to local time.
{{EmbedInteractiveExample("pages/js/date-setdate.html")}}
## Syntax
```js-nolint
setDate(dateValue)
```
### Parameters
- `dateValue`
- : An integer representing the day of the month.
### Return value
Changes the {{jsxref("Date")}} object in place, and returns its new [timestamp](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#the_epoch_timestamps_and_invalid_date). If `dateValue` is `NaN` (or other values that get [coerced](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#number_coercion) to `NaN`, such as `undefined`), the date is set to [Invalid Date](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#the_epoch_timestamps_and_invalid_date) and `NaN` is returned.
## Description
If you specify a number outside the expected range, the date information in the {{jsxref("Date")}} object is updated accordingly. For example, if the `Date` object holds June 1st, a `dateValue` of 40 changes the date to July 10th, while a `dateValue` of 0 changes the date to the last day of the previous month, May 31st.
## Examples
### Using setDate()
```js
const theBigDay = new Date(1962, 6, 7, 12); // noon of 1962-07-07 (7th of July 1962, month is 0-indexed)
const theBigDay2 = new Date(theBigDay).setDate(24); // 1962-07-24 (24th of July 1962)
const theBigDay3 = new Date(theBigDay).setDate(32); // 1962-08-01 (1st of August 1962)
const theBigDay4 = new Date(theBigDay).setDate(22); // 1962-07-22 (22nd of July 1962)
const theBigDay5 = new Date(theBigDay).setDate(0); // 1962-06-30 (30th of June 1962)
const theBigDay6 = new Date(theBigDay).setDate(98); // 1962-10-06 (6th of October 1962)
const theBigDay7 = new Date(theBigDay).setDate(-50); // 1962-05-11 (11th of May 1962)
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{jsxref("Date/Date", "Date()")}}
- {{jsxref("Date.prototype.getDate()")}}
- {{jsxref("Date.prototype.setUTCDate()")}}