JavaScript time difference calculation. Convert to days/hour/minute/second, calculate the difference between a time and the current time

var olddate = ' 2017/02/07 00:00:00 '; setinterval (function () {                var activedate = new Date ();                var diffdate = Activedate.gettime ()-New Date (olddate). GetTime ();                -----------------------                var days = Math.floor (diffdate/(24*3600*1000));                var leave1 = diffdate% (24*3600*1000);                var hours = Math.floor (leave1/(3600*1000));                var leave2 = leave1% (3600*1000);                var minutes = Math.floor (leave2/(60*1000));                var leave3 = leave2% (60*1000);                var seconds = Math.Round (leave3/1000);                Console.log ("<i style= ' color:red; > "+ days +" </i> Day <i style= ' color:red; ' > "+ hours +" </i> <i style= ' color:red; ' > "+ minutes +" </i> min <i style= ' color:red; ' > "+ seconds +" </i> sec ");            }, 1000);

Calculates the difference between a time and a current time

JavaScript time difference calculation. Convert to days/hour/minute/second, calculate the difference between a time and the current time