public boolean action(Event e, Object o) {
        if (e.target == nextButton) {
            calculator.set(yourBiorhythm.getCalcYear(),
                           yourBiorhythm.getCalcMonth(),
                           yourBiorhythm.getCalcDate());

            long pastDays = calculator.getPastDays();
            calculator.setPastDays(pastDays + 1);

            yourBiorhythm.setCalculateDay(calculator.getYear(),
                                          calculator.getMonth(),
                                          calculator.getDate());
            biorhythmCanvas.repaint();

            return true;
        } else if (e.target == prevButton) {
            calculator.set(yourBiorhythm.getCalcYear(),
                           yourBiorhythm.getCalcMonth(),
                           yourBiorhythm.getCalcDate());

            long pastDays = calculator.getPastDays();
            calculator.setPastDays(pastDays - 1);

            yourBiorhythm.setCalculateDay(calculator.getYear(),
                                          calculator.getMonth(),
                                          calculator.getDate());
            biorhythmCanvas.repaint();

            return true;
        } else if (e.target == setButton) {
            setDaysFrame.show();
            setDaysFrame.repaint();
            return true;
        }
        return false;
    }