制作日历c++ (初学者)

#include <iostream>
#include <ctime>

void printCalendar(int year, int month) {
    std::tm timeStruct = {};
    timeStruct.tm_year = year - 1900; // tm_year is years since 1900
    timeStruct.tm_mon = month - 1;    // tm_mon is 0-based
    timeStruct.tm_mday = 1;

    std::time_t time = mktime(&timeStruct);
    const std::tm* timeInfo = localtime(&time);

    int daysInMonth = 32 - mktime(new std::tm(*timeInfo), &time);
    int startDay = timeInfo->tm_wday;

    std::cout << "Sun Mon Tue Wed Thu Fri Sat" << std::endl;
    for (int i = 0; i < startDay; ++i) {
        std::cout << "    ";
    }
    for (int day = 1; day <= daysInMonth; ++day) {
        std::cout << std::setw(3) << day;
        if ((startDay + day) % 7 == 0) {
            std::cout << std::endl;
        }
    }
}

int main() {
    int year = 2023;
    int month = 10;
    printCalendar(year, month);
    return 0;
}