import java.util.Calendar;

class testCalendar1{

    public static void main(String args[]){
        Calendar calendar = Calendar.getInstance();

        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DATE);

        System.out.print("本日の日時は");
        System.out.println(year + "年" + (month + 1) + "月" + day + "日");

        /* 今月が何曜日から開始されているか確認する */
        calendar.set(year, month, 1);
        int startWeek = calendar.get(Calendar.DAY_OF_WEEK);
        System.out.println("今月の曜日は" + startWeek + "から");

        /* 先月が何日までだったかを確認する */
        calendar.set(year, month, 0);
        int beforeMonthlastDay = calendar.get(Calendar.DATE);
        System.out.println("先月は" + beforeMonthlastDay + "日まで");

        /* 今月が何日までかを確認する */
        calendar.set(year, month + 1, 0);
        int thisMonthlastDay = calendar.get(Calendar.DATE);
        System.out.println("今月は" + thisMonthlastDay + "日まで\r\n");

        int[] calendarDay = new int[42];
        int count = 0;

        /* 先月分の日付を格納する */
        for (int i = startWeek - 2 ; i >= 0 ; i--){
            calendarDay[count++] = beforeMonthlastDay - i;
        }

        /* 今月分の日付を格納する */
        for (int i = 1 ; i <= thisMonthlastDay ; i++){
            calendarDay[count++] = i;
        }

        /* 翌月分の日付を格納する */
        int nextMonthDay = 1;
        while (count % 7 != 0){
            calendarDay[count++] = nextMonthDay++;
        }

        int weekCount = count / 7;

        for (int i = 0 ; i < weekCount ; i++){
            for (int j = i * 7 ; j < i * 7 + 7 ; j++){
                if (calendarDay[j] < 10){
                    System.out.print(" " + calendarDay[j] + " ");
                }else{
                    System.out.print(calendarDay[j] + " ");
                }
            }

            System.out.print("\r\n");
        }
    }
}