public void removeListenerToHourChange(OnTimeStateChangeHandler function) { _onHourChange -= function; }
public void addListenerToMultiplierChange(OnTimeStateChangeHandler function) { _onTimeMultiplierChange += function; }
public void addListenerToHourChange(OnTimeStateChangeHandler function) { _onHourChange += function; }
public void addListenerToMonthChange(OnTimeStateChangeHandler function) { _onMonthChange += function; }