Date.prototype.setDate()
The setDate()
method changes the day of the month of a given Date
instance, based on local time.
To instead change the day of the month for a given Date
instance based on UTC time, use the setUTCDate()
method.
Syntax
setDate(dayValue)
Parameters
dayValue
-
An integer representing the day of the month.
Return value
The number of milliseconds between 1 January 1970 00:00:00 UTC and the given date (the
Date
object is also changed in place).
Description
If the dayValue
is outside of the range of date values for the
month, setDate()
will update the Date
object accordingly.
For example, if 0 is provided for dayValue
, the date will be
set to the last day of the previous month.
If a negative number is provided for dayValue
, the date will be
set counting backwards from the last day of the previous month. -1 would result in the
date being set to 1 day before the last day of the previous month.
Examples
Using setDate()
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
Specification |
---|
ECMAScript Language Specification # sec-date.prototype.setdate |
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