ARRAY 1D - 2009 Date after 'n' Days

import java.util.*;

class ValidDate2

{

    public static void main(String arg[])

    {

    int a[ ]={31,28,31,30,31,30,31,31,30,31,30,31};

    String day[ ]={"","JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"};

    String rd="";

    int d, m, y, n, i, x, z;

    Scanner br =new Scanner(System.in);

    System.out.println("Enter day number between 1 to 366 : ");

    d=br.nextInt( );

    System.out.println("Enter year : ");

    y=br.nextInt( );

    System.out.println("Enter value for date after n number of days - between 1 to 100");

    n=br.nextInt();

    if(y%4==0) a[1]=29;

    if(d>366 || n>100)

        System.out.println("INVALID INPUT");

        else

        {

            x=d+n;

            m=0;

            while(d>a[m])

                        d=d-a[m++];

            if(d==1 || d==21 || d==31) rd="st";

            else if(d==2 || d==22) rd="nd";

            else if(d==3 || d==23)  rd="rd";

            else rd="th";

            System.out.println(d + rd + " " + day[m+1] + ", " + y);

            i=0;

            if(y%4==0 && x>366) 

                {

                     x=x-366;

                     y=y+1;

                    }

            if(y%4!=0 && x>365)

                {

                    x=x-365;

                    y=y+1;

                }

            if(y%4==0) a[1]=29;

                else a[1]=28;

            while(x>a[i])

                x=x-a[i++];

            if(x==1 || x==21 || x==31) rd="st";

            else if(x==2 || x==22) rd="nd";

            else if(x==3 || x==23)  rd="rd";

            else rd="th";

            System.out.println("Date after " + n + " days is : " + x + rd + " " + day[i+1] + ", " + y);

        }

    }

}