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Date.prototype.valueOf()

The valueOf() method returns the primitive value of a Date object.

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Syntax

valueOf()

Return value

The number of milliseconds between 1 January 1970 00:00:00 UTC and the given date, or NaN in case of an invalid date.

Description

The valueOf() method returns the primitive value of a Date object as a number data type, the number of milliseconds since midnight 01 January, 1970 UTC.

This method is functionally equivalent to the Date.prototype.getTime() method.

This method is usually called internally by JavaScript and not explicitly in code.

Examples

Using valueOf()

const x = new Date(56, 6, 17);
const myVar = x.valueOf();      // assigns -424713600000 to myVar

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
valueOf
1
12
1
4
3
1
4.4
18
4
10.1
1
1.0
1.0
0.10.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/valueOf