JavaScript .valueOf()

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Anonymous contributor
Published Jul 22, 2021Updated May 31, 2023

Returns the difference in milliseconds between the specified date and January 1, 1970 00:00:00 UTC.

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Syntax

myDate.valueOf();

Example 1

Print the value of January, 1st, 1970 at 12:00:00 AM.

const date = new Date(1999, 00, 01, 0, 0, 0, 0);


console.log(date);
// Output: Fri Jan 01 1999 00:00:00 GMT-0800 (Pacific Standard Time)
// Note: Timezone may vary


console.log(date.valueOf());
// Output: 915177600000

Codebyte Example

The following is runnable, and demonstrates the use of the .valueOf() method.

Code
Output


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  • Career path
    Front-End Engineer
    Front-end engineers work closely with designers to make websites beautiful, functional, and fast.
    • Includes 34 Courses
    • With Professional Certification
    • Beginner Friendly.
      115 hours
  • Free course
    Learn JavaScript
    Learn how to use JavaScript — a powerful and flexible programming language for adding website interactivity.
    • Beginner Friendly.
      15 hours