public void stateChanged(ChangeEvent e) {
		SpinnerNumberModel model = (SpinnerNumberModel) ((JSpinner) e.getSource()).getModel();
		int value = model.getNumber().intValue();
		boolean increase = (value > oldSpinnerValue) ? true : false;
		oldSpinnerValue = value;

		int month = getMonth();

		if (increase) {
			month += 1;

			if (month == 12) {
				month = 0;

				if (yearChooser != null) {
					int year = yearChooser.getYear();
					year += 1;
					yearChooser.setYear(year);
				}
			}
		} else {
			month -= 1;

			if (month == -1) {
				month = 11;

				if (yearChooser != null) {
					int year = yearChooser.getYear();
					year -= 1;
					yearChooser.setYear(year);
				}
			}
		}

		setMonth(month);
	}