Вывод дня, месяца, года

#include <iostream>
#include <string>
 
int main() 
{
    enum month { January, February, March, April, May, June, July, August, September, October, November, December };
    std::string date;
    std::cin >> date;
    int mon = atoi(date.c_str());
    std::cout << date[3] << date[4] << " ";
    switch(mon-1)
    {
    case January:
        std::cout << "January";
        break;
    case February:
        std::cout << "February";
        break;
    case March:
        std::cout << "March";
        break;
    case April:
        std::cout << "April";
        break;
    case May:
        std::cout << "May";
        break;
    case June:
        std::cout << "June";
        break;
    case July:
        std::cout << "July";
        break;
    case August:
        std::cout << "August";
        break;
    case September:
        std::cout << "September";
        break;
    case October:
        std::cout << "October";
        break;
    case November:
        std::cout << "November";
        break;
    case December:
        std::cout << "December";
        break;
    }
    std::cout << ", 19" << date[6] << date[7] << std::endl;
    system("pause");
    return 0;
}

int mon = atoi(date.c_str());
        std::cout << date[3] << date[4] << " ";