C :

#include "stdio.h"
#include "math.h"
int main() {
    int mm, dd, yy;
    //printf("Enter a date (mm/dd/yy):\n");
    scanf("%d/%d/%d", &mm, &dd, &yy);
    printf("You entered the date: %04d.%02d.%02d\n", yy, mm, dd);
}