@Override
	public void tickTock(int howManyHours)
	{
		final TimeOfDay todCode=getTODCode();
		if(howManyHours!=0)
		{
			setHourOfDay(getHourOfDay()+howManyHours);
			lastTicked=System.currentTimeMillis();
			while(getHourOfDay()>=getHoursInDay())
			{
				setHourOfDay(getHourOfDay()-getHoursInDay());
				setDayOfMonth(getDayOfMonth()+1);
				if(getDayOfMonth()>getDaysInMonth())
				{
					setDayOfMonth(1);
					setMonth(getMonth()+1);
					if(getMonth()>getMonthsInYear())
					{
						setMonth(1);
						setYear(getYear()+1);
					}
				}
			}
			while(getHourOfDay()<0)
			{
				setHourOfDay(getHoursInDay()+getHourOfDay());
				setDayOfMonth(getDayOfMonth()-1);
				if(getDayOfMonth()<1)
				{
					setDayOfMonth(getDaysInMonth());
					setMonth(getMonth()-1);
					if(getMonth()<1)
					{
						setMonth(getMonthsInYear());
						setYear(getYear()-1);
					}
				}
			}
		}
		if(getTODCode()!=todCode)
			handleTimeChange();
	}