function renderServerTime(ltim) {
  var tim= Math.floor(ltim/1000);
  var sec = tim % 60;
  tim= Math.floor(tim/60);
  var m = tim % 60;
  tim= Math.floor(tim/60);
  var h = tim % 24;
  var s="";
  if (h<10) s="0";
  s=s+h+":";
  if (m<10) s=s+"0";
  s=s+m+":";
  if (sec<10) s=s+"0";
  s=s+sec;
  return s;
}