JavaScript Date getTime() Method

22 Nov, 2021
In this article, we will learn the getTime() method in Javascript, along with understanding their implementation through the examples.
The date.getTime() method is used to return the number of milliseconds since 1 January 1970. when a new Date object is created it stores the date and time data when it is created. When the getTime() method is called on this date object it returns the number of milliseconds since 1 January 1970 (Unix Epoch). The getTime() always uses UTC for time representation.
Syntax:
Date.getTime()
Parameters: This method does not accept any parameter. 
Return type: A numeric value equal to no of milliseconds since Unix Epoch.
Please refer to the JavaScript Get Date Methods article for further details.
Example: Below is the example of the Date getTime() method.
Javascript
<script>    // Here a date has been assigned    // While creating Date object    var A = new Date('October 15, 1996 05:35:32');     // Hour from above is being   // extracted using getTime()   var B = A.getTime();     // Printing time in milliseconds.   document.write(B); </script>
Output:
845337932000
More examples for the above method are as follows:
Example 1: Here, the date of the month must lie in between 1 to 31 because no date can have a month greater than 31. That is why it returns NaN i.e, Not a Number if the month in the Date object is greater than 31. Hours will not have existed when the date of the month is given as 33 i.e, greater than 31.
Javascript
<script>     // Creating a Date object    var A = new Date('October 35, 1996 12:35:32');    var B = A.getTime();        // Printing hour.    document.write(B); </script>
Output:
NaN
Example 2: Here, we will calculate the user’s age by providing the birth date of the user.
HTML
<!DOCTYPE html><html lang="en">  <head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width,                 initial-scale=1.0">    <meta http-equiv="X-UA-Compatible" content="ie=edge">    <title>Document</title></head>  <body>    <h1>GeeksforGeeks</h1>    <h3>Date.getTime() Method</h3>    <div>        <h4>Birth Date:            <span class="date"></span>        </h4> </div>    <div>        <h4>getTime():            <span class="time"></span>        </h4> </div>    <div>        <h4>I am             <span class="years"></span>             years old.        </h4></div>    <script>        var BD = new Date("July 29, 1997 23:15:20");        var date = document.querySelector(".date");        var time = document.querySelector(".time");        var Today = new Date();        var today = Today.getTime();        var bd = BD.getTime();        var year = 1000 * 60 * 60 * 24 * 365;        var years = (today - bd) / year;        date.innerHTML = BD;        time.innerHTML = BD.getTime();        var y = document.querySelector(".years");        y.innerHTML = Math.round(years);    </script></body>  </html>
Output:
 date.getTime() Method
Supported Browsers: The browsers supported by JavaScript Date getTime() method are listed below:
Google Chrome 1.0
Microsoft Edge 12.0
Firefox 1.0
Internet Explorer 4.0
Opera 3.0
Safari 1.0
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