[Java] Calendar

package zadanie5;

/**
 *
 * @author Student
 */
public class Calendar {
    private int year;
    private int mounth;
    private int day;

    public Calendar(int day, int mounth, int year) throws Exception{

        if(mounth < 1 || mounth > 12)
            throw new Exception("Date problem - mounth");
        if(((year == 0 || year % 4 == 0) && day > 29) || ((year != 0 || year % 4 != 0) && day > 28) )
            throw new Exception("Date problem - mounth - February");

        this.year = year;
        this.mounth = mounth;
        this.day = day;

    }
}