SyncEvent::updateExcludedDatesMasterEvent

private function updateExcludedDatesMasterEvent(CoreBaseDate $excludedDate): void
{
	$date = clone $excludedDate;
	$date->setDateTimeFormat(CoreEventPropertiesExcludedDatesCollection::EXCLUDED_DATE_FORMAT);

	if ($this->event->getExcludedDateCollection())
	{
		$this->addExcludeDate($date);
	}
	else
	{
		$this->event->setExcludedDateCollection(new CoreEventPropertiesExcludedDatesCollection([$date]));
	}
}