isFullDayEvent (event) {
		if (event.start.length === 8 || event.start.dateOnly || event.datetype === "date") {
			return true;
		}

		const start = event.start || 0;
		const startDate = new Date(start);
		const end = event.end || 0;
		if ((end - start) % (24 * 60 * 60 * 1000) === 0 && startDate.getHours() === 0 && startDate.getMinutes() === 0) {
			// Is 24 hours, and starts on the middle of the night.
			return true;
		}

		return false;
	}
Checks if an event is a fullday event.
@param {object} event The event object to check.
@returns {boolean} True if the event is a fullday event, false otherwise