Change Content - Javascript

Change html element content using pure javascript author(s): Deepu Mohan Puthrote (WarFox)

HTML

<div id="placeholder">
  <p>Changing Date of Birth in JavaScript</p> 
</div>

JavaScript

var Date_of_Birth = "November 23, 1999";
var millisecondsBetweenDOBAnd1970 = Date.parse(Date_of_Birth);
var millisecondsBetweenNowAnd1970 = Date.now();
var ageInMilliseconds = millisecondsBetweenNowAnd1970-millisecondsBetweenDOBAnd1970;


  var milliseconds = ageInMilliseconds;
  var second = 1000;
  var minute = second*60;
  var hour = minute*60;
  var day = hour*24;
  var month = day*30; 

  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;