linux c++ 获取时间

#include <iostream>
#include <ctime>

int main() {
    std::time_t now = std::time(nullptr);
    std::cout << "Current timestamp: " << now << std::endl;
    return 0;
}

#include <iostream>
#include <ctime>

int main() {
    std::time_t now = std::time(nullptr);
    std::tm* local_time = std::localtime(&now);
    char buffer[80];
    std::strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", local_time);
    std::cout << "Local time: " << buffer << std::endl;
    return 0;
}

#include <iostream>
#include <ctime>

int main() {
    std::time_t now = std::time(nullptr);
    std::tm* utc_time = std::gmtime(&now);
    char buffer[80];
    std::strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", utc_time);
    std::cout << "UTC time: " << buffer << std::endl;
    return 0;
}

#include <iostream>
#include <chrono>

int main() {
    auto now = std::chrono::system_clock::now();
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()).count();
    std::cout << "Current time in milliseconds: " << ms << std::endl;
    return 0;
}

#include "date/date.h"
#include <iostream>

int main() {
    using namespace date;
    using namespace std::chrono;

    auto now = system_clock::now();
    auto local_time = make_zoned(current_zone(), now);
    std::cout << "Local time: " << local_time << std::endl;
    return 0;
}