The valueOf()
method returns the primitive value of a Date
object.
Syntax
dateObj.valueOf()
Return value
The number of milliseconds between 1 January 1970 00:00:00 UTC and the given 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()
var x = new Date(56, 6, 17); var myVar = x.valueOf(); // assigns -424713600000 to myVar
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1. |
ECMAScript 5.1 (ECMA-262) The definition of 'Date.prototype.valueOf' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Date.prototype.valueOf' in that specification. |
Standard | |
ECMAScript Latest Draft (ECMA-262) The definition of 'Date.prototype.valueOf' in that specification. |
Draft |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
valueOf | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
Legend
- Full support
- Full support