JavaScript Date valueOf()

Get the primitive value of a date object:

const d = new Date();
let ms = d.valueOf();

Description

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

Note: The primitive value is returned as the number of millisecond since midnight January 1, 1970 UTC.

valueOf() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

Date.valueOf()

None

Return Value:	A Number, representing the number of milliseconds between the date object and midnight January 1, 1970 UTC
JavaScript Version:	ECMAScript 1