Hi Manish,
Please go through the link
Javascript Timer

Also, here I am writing some code to create a simple Timer StopWatch you can modify it as per your requirement.
Code:

Script:
window.onload = function()
{
  stopwatch('Start');
}
var sec = 0;
var min = 0;
var hour = 0;
function stopwatch(text) {
   sec++;
  if (sec == 60) {
   sec = 0;
   min = min + 1; }
  else {
   min = min; }
  if (min == 60) {
   min = 0; 
   hour += 1; }

if (sec<=9) { sec = "0" + sec; }
   document.clock.stwa.value = ((hour<=9) ? "0"+hour : hour) + " : " + ((min<=9) ? "0" + min : min) + " : " + sec;

  if (text == "Start") { document.clock.theButton.value = "Stop "; }
  if (text == "Stop ") { document.clock.theButton.value = "Start"; }

  if (document.clock.theButton.value == "Start") {
   window.clearTimeout(SD);
   return true; }
SD=window.setTimeout("stopwatch();", 1000);
}

function resetIt() {
  sec = -1;
  min = 0;
  hour = 0;
  if (document.clock.theButton.value == "Stop ") {
  document.clock.theButton.value = "Start"; }
  window.clearTimeout(SD);
 }


var c=0
var t
function stopCount()
{
clearTimeout(t)
}
function timedCount()
{
document.getElementById('txt').value=c
c=c+1
if(c==61)
{
alert("time over")
stopcount()
}
t=setTimeout("timedCount()",1000)
}

HTML:
< form>
 < input type="text" id="txt">
 < input type="button" value="Start stopwatch" onClick="timedCount()">
 < p>Click on the Start button above to start the stopwatch.


Script:
var time = 0,
    elapsed = '0.0';
window.setInterval(function()
{
    time += 100;
    elapsed = Math.floor(time / 100) / 10;
    if(Math.round(elapsed) == elapsed) { elapsed += '.0'; }
    document.title = elapsed;
}, 100);

Hi Manish,

Use the below code for Solution.

<span id="countdown">01:30:10</span>
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
<script type="text/javascript">
    (function(){
  $(document).ready(function() {
      var time = "01:30:10",
      parts = time.split(':'),
      hours = +parts[0],
      minutes = +parts[1],
      seconds = +parts[2],
      span = $('#countdown');

    function correctNum(num) {
      return (num<10)? ("0"+num):num;
    }

    var timer = setInterval(function(){
        seconds--;
          if(seconds == -1) {
            seconds = 59;
              minutes--;

              if(minutes == -1) {
                minutes = 59;
                  hours--;

                  if(hours==-1) {
                  alert("timer finished");
                  clearInterval(timer);
                  return;
                }
            }
        }
          span.text(correctNum(hours) + ":" + correctNum(minutes) + ":" + correctNum(seconds));
    }, 1000);
  }); 
})()

</script>