#include <iostream>
#include <chrono>
#include <ctime>

int main() {
    // Use std::chrono::system_clock::now() to get the current time
    auto now = std::chrono::system_clock::now();
    std::cout << std::chrono::system_clock::to_time_t(now) << std::endl;

    // Get elapsed time since the Unix epoch in seconds, milliseconds, or nanoseconds
    auto epoch = now.time_since_epoch();
    auto seconds = std::chrono::duration_cast<std::chrono::seconds>(epoch);
    auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(epoch);
    auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(epoch);

    std::cout << seconds.count() << std::endl;
    std::cout << milliseconds.count() << std::endl;
    std::cout << nanoseconds.count() << std::endl;

    // You can also convert integer seconds or nanoseconds since the epoch into the corresponding time
    std::time_t time_seconds = seconds.count();
    std::cout << std::ctime(&time_seconds);

    auto time_point = std::chrono::system_clock::time_point(nanoseconds);
    std::time_t time_nanoseconds = std::chrono::system_clock::to_time_t(time_point);
    std::cout << std::ctime(&time_nanoseconds);

    return 0;
}