function secondsTimeSpanToHMS(s) {
  var sign = '';
  if (s < 0) {
  sign = '-';
  s = -1*s;
  }
  var h = Math.floor(s / 3600);
  s -= h * 3600;
  var m = Math.floor(s / 60);
  s -= m * 60;
  var result = (m < 10 ? '0' + m : m) + ":" + (s < 10 ? '0' + s : s);
  if (h>0) {
  result = h + ":" + result;
  }
  return sign + result;
}