Date.now()

Summary

The Date.now() method returns the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC.

Syntax

var timeInMs = Date.now();

Parameters

None.

Description

The now() method returns the milliseconds elapsed since 1 January 1970 00:00:00 UTC up until now as a Number.

Because now is a static method of Date, you always use it as Date.now().

Polyfill

This method was standardized in ECMA-262 5th edition. Engines which have not been updated to support this method can work around the absence of this method using the following shim:

if (!Date.now) {
  Date.now = function now() {
    return new Date().getTime();
  };
}

Specifications

Specification Status Comment
ECMAScript Language Specification 5.1th Edition (ECMA-262)
Implemented in JavaScript 1.5
Standard Initial definition.
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Based on Kangax's compat table.

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 5 3 9 10.50 4
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? ?

See also

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