Name: joT67522 Date: 12/02/97


When the date field is 31, sometimes it adds 31 days instead of adding
1 month when you use the add method to increment the month.

Notice the error for January, March, May, August, October.
Okay for July, December.



import java.util.*;

public class CalendarBug{
        public static void main(String args[]){
                CalendarBug c = new CalendarBug();}

        public CalendarBug(){
                int[] y = {31,28,31,30,31,30,31,31,30,31,30,31};

                for (int x=0;x<12;x++) {
                        GregorianCalendar gc = new GregorianCalendar(1997,x,y[x]);
                        System.out.println("Original Date: "+(gc.get(Calendar.MONTH)+1)+"/"+gc.get(Calendar.DATE)+"/"+gc.get(Calendar.YEAR));

                        gc.add(Calendar.MONTH, 1);
                        System.out.println("New Date: "+(gc.get(Calendar.MONTH)+1)+"/"+gc.get(Calendar.DATE)+"/"+gc.get(Calendar.YEAR));

                }

                System.exit(0);}
}


Original Date: 1/31/1997
New Date: 3/3/1997
Original Date: 2/28/1997
New Date: 3/28/1997
Original Date: 3/31/1997
New Date: 5/1/1997
Original Date: 4/30/1997
New Date: 5/30/1997
Original Date: 5/31/1997
New Date: 7/1/1997
Original Date: 6/30/1997
New Date: 7/30/1997
Original Date: 7/31/1997
New Date: 8/31/1997
Original Date: 8/31/1997
New Date: 10/1/1997
Original Date: 9/30/1997
New Date: 10/30/1997
Original Date: 10/31/1997
New Date: 12/1/1997
Original Date: 11/30/1997
New Date: 12/30/1997
Original Date: 12/31/1997
New Date: 1/31/1998

(Review ID: 21209)
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