Javascript Data Type How to - Calculate time diffrence between now and future time of same day

Question

We would like to know how to calculate time diffrence between now and future time of same day.

Answer


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){<!-- ww  w .ja va2 s .  com-->
showDiff();
function showDiff(){
    var date1 = new Date();    
    var date2 = new Date("2015/07/30 21:59:00");
    //Customise date2 for your required future time
    var diff = (date2 - date1)/1000;
    var diff = Math.abs(Math.floor(diff));
    var days = Math.floor(diff/(24*60*60));
    var leftSec = diff - days * 24*60*60;
    var hrs = Math.floor(leftSec/(60*60));
    var leftSec = leftSec - hrs * 60*60;
    var min = Math.floor(leftSec/(60));
    var leftSec = leftSec - min * 60;
    document.getElementById("showTime").innerHTML = "You have " + days + " days " + hrs + " hours " + min + " minutes and " + leftSec + " seconds before death.";
setTimeout(showDiff,1000);
}
}
</script>
</head>
<body>
  <div id="showTime"></div>
</body>
</html>

The code above is rendered as follows: