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HTML

              
                <div id="placeholder">
  <p>Change DOB in JS</p> 
</div>

<!--
Author: Navjot Singh Virk 
Full Tutorial with detailed explaination: https://mrvirk.com/javascript-to-calculate-age-from-date-of-birth.html
-->

              
            
!

CSS

              
                
              
            
!

JS

              
                //Change ME
var DOB = "March 1, 1995";
var millisecondsBetweenDOBAnd1970 = Date.parse(DOB);
var millisecondsBetweenNowAnd1970 = Date.now();
var ageInMilliseconds = millisecondsBetweenNowAnd1970-millisecondsBetweenDOBAnd1970;
//--We will leverage Date.parse and now method to calculate age in milliseconds refer here https://www.w3schools.com/jsref/jsref_parse.asp

  var milliseconds = ageInMilliseconds;
  var second = 1000;
  var minute = second*60;
  var hour = minute*60;
  var day = hour*24;
  var month = day*30; 
/*using 30 as base as months can have 28, 29, 30 or 31 days depending a month in a year it itself is a different piece of comuptation*/
  var year = day*365;

//let the age conversion begin
var years = Math.round(milliseconds/year);
var months = years*12;
var days = years*365;
var hours = Math.round(milliseconds/hour);
var seconds = Math.round(milliseconds/second);

  
function printResults(){
  var message = "Age in Years : "+years+
     "</br>Age in Months : "+months+
       "</br>Age in Days : "+days+
      "</br>Age in Hours : "+hours+
      "</br>Age in Seconds : "+seconds+
      "</br>Age in Milliseconds : "+milliseconds;
  document.getElementById('placeholder').innerHTML = message;
}

window.onload = printResults;
              
            
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999px

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