code: function () {
          var tzo = jsdate.getTimezoneOffset();
          var tzoNum = Math.abs(tzo);
          return (tzo > 0 ? '-' : '+') + humanize.pad(Math.floor(tzoNum / 60) * 100 + tzoNum % 60, 4, '0');
        }
docs: Whether or not the date is in daylight savings time /*
  I: function () {
  Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
  If they are not equal, then DST is observed.
  var Y = f.Y();
  return 0 + ((new Date(Y, 0) - Date.UTC(Y, 0)) !== (new Date(Y, 6) - Date.UTC(Y, 6)));
  },
   Difference to GMT in hour format; e.g. +0200