Date.prototype.setDate() - JavaScript 编辑

The setDate() method sets the day of the Date object relative to the beginning of the currently set month.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

dateObj.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()

var theBigDay = new Date(1962, 6, 7); // 1962-07-07 (7th of July 1962)
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 (22th of August 1962)
theBigDay.setDate(0);   // 1962-07-31 (31th of July 1962)
theBigDay.setDate(98);  // 1962-10-06 (6th of October 1962)
theBigDay.setDate(-50); // 1962-08-11 (11th of August 1962)

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Date.prototype.setDate' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

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