sleep_until

    using std::chrono::system_clock;

    std::time_t tt = system_clock::to_time_t(system_clock::now());

    struct std::tm * ptm = std::localtime(&tt);

    std::cout << "Current time: " << std::put_time(ptm, "%X") << '\n';

    

    std::cout << "Waiting for the next minute to begin...\n";

    ++ptm->tm_min; ptm->tm_sec = 0;

    std::this_thread::sleep_until(system_clock::from_time_t(mktime(ptm)));

    std::cout << std::put_time(ptm, "%X") << " reached!\n";