JS code that calculates the duration using millisecond impairment

function MsToDuration(ms){
 var sec=0,min=0,hour=0,day=0,dur={};
 if(ms>0){
//Second
  sec=(ms/1000).toFixed(2);
//point
  if(sec >= 60){
   min=(sec/60);
   sec=(sec%60).toFixed(2);
  }
//hour
  if(min >= 60){
   hour=(min/60);
   min=min%60;
  }
//sky
  if(hour >= 24){
   day=(hour/24);
   hour=hour%24;
  }
 }
//Return value
 =day;
 =hour;
 =min;
 =sec;
 return dur;
}