Function _addDate

codebase/sources/dhtmlxscheduler.es.js:18224–18232

(date, collection)

  }
}
function _addDate(date, collection) {
  if (!(date instanceof Date)) {
    throw new TypeError(String(date) + " is not Date instance");
  }
  if (!includes(collection.map(Number), Number(date))) {
    collection.push(date);
    sort(collection);
  }
}
function rdatesToString(param, rdates, tzid) {
  var isUTC = !tzid || tzid.toUpperCase() === "UTC";
  var header = isUTC ? "".concat(param, ":") : "".concat(param, ";TZID=").concat(tzid, ":");