public static String getAvailableTimeSlot(long[] aUid) {
		TimeSlotHelper helper =
				new TimeSlotHelper(DateUtil.getStartOfDay(TimeMachine.getNow()
						.getTime()), 5);
		for (long uid : aUid)
		{
			helper.removeByUser(uid);
		}
		return helper.toSentence();
	}