"General Protection Exception" error

// I can't get the loop to work. I want the user to be prompt for 5 dates and
// then have those dates display in columns.
// The program compiles without the loop. If I leave the loop in, the user gets a
// "General Protection Exception 0x550F: 0x3CBA: Processor Fault" error

/*********************************************************************/
/* This program will take a date in U.S. date format (mm/dd/yy) */
/* and convert it to all of the following formats. */
/* Date formats are as follows: */
/* */
/* European date format: dd/mm/yy */
/* Julian date format: yyjjj */
/* Military date format: dd-MON-yyyy */
/* Business date format: dd month yyyy */
/* */
/*********************************************************************/

#include<stdio.h>
#include <conio.h>
#define MONTHS 12

int main()
{
int indexj,index;
printf("\nThis program will convert up to five dates into the US, \n");
printf("European, the Julian, military, and business formats.\n");
char again='y';
while (again == 'Y' || again == 'y')
{
//define arrays for days and months
int days[MONTHS]={31,28,31,30,31,30,31,31,30,31,30,31};
char mon[12][4]={"JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"};
char month[12][10]={"January","February","March","April","May","June","July","August","September","October","November","December"};

//define arrays for conversion
int mm[5];
int dd[5];
int yy[5];
int jjj[5];
int yyyy[5];
for (index=0;index<5;index++)
{
days[1]=28;
//define variables
printf("Please input a four digit year:\n"); //input year
scanf("%d",&yy[index]);
while (!(yy[index] > 1899 && yy[index] < 2200)) //error check
{
printf ("\aPlease enter a year between 1900 and 2199:\n");
scanf("%d",&yy[index]);
}
if ((yy[index] % 100 == 0 && yy[index] % 400 == 0)||(yy[index] % 100 != 0 && yy[index] % 4 ==0))
{
days[1]=days[1]+1;
}
printf("Please input month as a number between 1 and 12:\n"); //input month
scanf("%d",&mm[index]);
while (mm[index] < 1 || mm[index] > 12) //error check
{
printf ("\aPlease enter a number between 1 and 12:\n");
scanf("%d",&mm[index]);
}
printf("Please input day as a number:\n"); //input day
scanf("%d",&dd[index]);
while (dd[index] < 1 || dd[index] > days[mm[index]-1]) //error check
{
printf ("\aPlease re-enter a valid number :\n");
scanf("%d",&dd[index]);
}
if ( yy[index] <2000) //adjusts for two digit years
{
yyyy[index] = yy[index]-1900;
}
if (yy[index] >= 2000 && yy[index] < 2100)
{
(yyyy[index] = yy[index]-2000);
}
if (yy[index] >= 2100)
{
(yyyy[index] = yy[index]-2100);
}
//converting into julian
jjj[index]=0;
for (indexj=1;indexj<=mm[index]-1;indexj++)
jjj[index] += days[indexj-1]; //add days up
clrscr();

//print results
printf("\nUS date:\tEuropean:\t Julian:\tMilitary:\tBusiness\n");
for (index=0;index<5;index++)
{

printf("%2d/%2d/%2d\t%2d/%2d/%2d\t %2d%-3d\t\t%d-%s-%d\t%d %s %d \n", mm[index], dd[index], yyyy[index], dd[index], mm[index], yyyy[index], yyyy[index],
jjj[index]+dd[index], dd[index], mon[mm[index]-1], yy[index], dd[index], month[mm[index]-1], yy[index]);

}

}
}
}