countdown timer from current date to specific date in javascript -

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// thought of .. guess current date format , specified date format different. please. 

    `<script>      var oneday = 24*60*60*1000; // hours*minutes*seconds*milliseconds      var firstdate = new date();      var seconddate = new date(2016,02,20);      var diffdays = math.round(math.abs((firstdate.gettime() - seconddate.gettime())/(oneday)));      document.getelementbyid("demo").innerhtml =diffdays;      </script>`

you can - 

<script>    var oneday = 24*60*60*1000; // hours*minutes*seconds*milliseconds    var firstdate = new date();    var seconddate = new date(2016,02,20);    var diffdays = 'expired';    if(seconddate>=firstdate){       diffdays = parseint((seconddate - firstdate)/oneday) + ' days left';    }    document.getelementbyid("demo").innerhtml =diffdays; </script>

here fiddle fiddle


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