Last Updated : 11 Jul, 2025
The date.valueOf() method is used to get the number of milliseconds between 1 January 1970 00:00:00 UTC and the given date.
Syntax:dateObj.valueOf()Parameters:
This method does not accept any parameter. It is just used along with a Date object created using Date() constructor.
Return Values:It returns the number of milliseconds between 1 January 1970 00:00:00 UTC and the given date as the contents of the Date() constructor.
Note: The DateObj is a valid Date object created using Date() constructor whose contents are used to get the number of milliseconds between 1 January 1970 00:00:00 UTC and the given date as the contents of the Date() constructor.
Example 1: This example shows the use of JavaScript Date valueOf() Method.
javascript
// Here a date has been assigned
// while creating Date object
let dateobj =
new Date('October 15, 1996 05:35:32');
// Getting the number of milliseconds between
// 1 January 1970 00:00:00
// UTC and the given date as the content of
// the above Date() constructor.
let B = dateobj.valueOf();
// Printing the calculated number
// of milliseconds.
console.log(B);
Output:
845337932000
Example 2: If nothing as a parameter is passed while creating a date object but still the valueOf() method returns the number of milliseconds between 1 January 1970 00:00:00 UTC and the current date.
javascript
// Here nothing has been assigned
// while creating Date object
let dateobj = new Date();
// Getting the number of milliseconds between
// 1 January 1970 00:00:00
// UTC and the current date.
let B = dateobj.valueOf();
// Printing the calculated number
// of milliseconds.
console.log(B);
Output:
1524387231290
Example 3: Date of a month ranging between 1 to 31. If the date is taken as 35 which is out of the date range, it returns NaN i.e, not a number.
javascript
// Here a date has been assigned
// while creating Date object
let dateobj = new Date('October 35, 1996 05:35:32');
// Getting the number of milliseconds between
// 1 January 1970 00:00:00
// UTC and the given date.
let B = dateobj.valueOf();
// Printing the calculated number
// of milliseconds.
console.log(B);
Output:
NaN
Some Important Points:
We have a complete list of Javascript Date Objects, to check those please go through this Javascript Date Object Complete reference article.
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