Calculate age given the birth date in the format YYYYMMDD in Javascript

In this tutorial, we are going to see how to calculate the age of a person using their birth date as input in JavaScript.
 

Script to calculate the age from the birth date

<script type="text/javascript">
    function getAge(date) { 
        var diff = Date.now() - date.getTime();
        var age = new Date(diff); 

        return Math.abs(age.getUTCFullYear() - 1970);
    }

    alert(getAge(new Date(1995, 12, 6))); //Date(year, month, day)   
</script>

Output:

23

To get the person’s age in milliseconds, subtract the birth date (date.getTime()) from the current date (Date.now()). The Date.now() method returns the number of milliseconds since January 1, 1970.
 
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