MM/dd/yy SimpleDateFormat accepts 55/99/00

Question

Hi,
I found out that MM/dd/yy would accept 55/22/80 instead of just allowing MM to be in the range of 01 to 12 same is the case with dd. If i specify aa/bb/cc it goes to the catch block. If I can make it to go to the catch block if the range of month and date is inappropriate I guess my code would work.
Here is a small java code I wrote for debugging.
import java.util.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class checkDates {
     public static void main(String[] args) {
          String aMask = "mm/dd/yy";
SimpleDateFormat mydf = new SimpleDateFormat(aMask);
Date date;
String newEffDate = "25/99/80";
try {
               date = mydf.parse(newEffDate);
          System.out.println("Date is working" + newEffDate);
               } catch (ParseException pe) {
               System.out.println("Date is not working");
}

Answer 1

it is working if I enter date 03/55/05 where day 55 is incorrect and it goes to the catch block
but if i enter 55/31/05 where date is in proper range but MM (month) is not in proper range it is not going to the catch block