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)
theBigDay.setDate(24);  // 1962-07-24 (24th of July 1962)
theBigDay.setDate(32);  // 1962-08-01 (1st of August 1962)
theBigDay.setDate(22);  // 1962-08-22 (22nd of August 1962)
theBigDay.setDate(0);   // 1962-07-31 (31st of July 1962)
theBigDay.setDate(98);  // 1962-10-06 (6th of October 1962)
theBigDay.setDate(-50); // 1962-08-11 (11th of August 1962)

Specifications

Browser compatibility

See also

• Date()
• Date.prototype.getDate()
• Date.prototype.setUTCDate()