Function daysBetween

codebase/sources/dhtmlxscheduler.js:15809–15814

(date1, date2)

    return isDate(value) && !isNaN(value.getTime());
  };
  var daysBetween = function(date1, date2) {
    var date1ms = date1.getTime();
    var date2ms = date2.getTime();
    var differencems = date1ms - date2ms;
    return Math.round(differencems / ONE_DAY);
  };
  var toOrdinal = function(date) {
    return daysBetween(date, ORDINAL_BASE);
  };