private boolean timeOK (int hour, int min, int sec)
    {
        return ((hour>= 1 && hour<=24) && (min>=0 && min <=60) && (sec >= 0 && sec<= 60));
    }

    public String convertTime (int hour)
    {
        String timeDetermine;

        if(hour>=12)
            timeDetermine = "PM";
        else
            timeDetermine = "AM";

        this.hour = hour % 12;

        return timeDetermine;
    }