[hardwired]

Compiles okay now.

Code:

public class ClockRx {
    int sec; 
    int min;
    int hr;
    int day;
    int mon;
    int yr;

    public boolean isLeapYear( ) {
        return yr % 400 == 0 || (yr % 100 != 0 && yr % 4 == 0);
    }

    public void tick( ) {
        sec++;
        if (sec == 60) {
            sec = 0;
            min++;
        }

        if (min == 60) {
            min = 0;
            hr++;
        }

        if (hr == 24) {
            hr = 0;
            day++;
        }

        switch (mon) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                if (day == 32) {
                    day = 1;
                    mon++;
                }
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                if (day == 31) {
                    day = 1;
                    mon++;
                }
                break;
            case 2:
                if ((isLeapYear( ) && day == 30) ||
                    (!isLeapYear( ) && day == 29)) {
                    day = 1;
                    mon++;
                }
                break;
            default:
                System.out.println("Illegal month.");
        }
    }

    public String getMonthName( ) {
        switch(mon) {
            case 1: return "January";
            case 2: return "February";
            case 3: return "March";
            case 4: return "April";
            case 5: return "May";
            case 6: return "June";
            case 7: return "July";
            case 8: return "August";
            case 9: return "September";
            case 10: return "October";
            case 11: return "November";
            case 12: return "December";
            default: return "Illegal month";
        }
/*
        if (mon == 13) {
            mon = 1;
            // "year" has not been declared
//            year++;
            // "yr" has
            yr++;
        }
*/
    }

    public String toString( ) {
        if (hr == 0)
            return String.format("%s %d, %d 12:%02d:%02d AM",
                                  getMonthName( ), day, yr, min, sec);
        else if (hr < 12)
            return String.format("%s %d, %d %02d:%02d:%02d AM",
                                  getMonthName( ), day, yr, hr, min, sec);
        else if (hr == 12)
            return String.format("%s %d, %d 12:%02d:%02d PM",
                                  getMonthName( ), day, yr, min, sec);
        else if (hr > 12 && hr < 24)
            return String.format("%s %d, %d %02d:%02d:%02d PM",
                                  getMonthName( ), day, yr, hr % 12, min, sec);
        else
            return "Illegal month";
    }
}