time

std::chrono::time_point<std::chrono::system_clock> p1, p2, p3;p2 = std::chrono::system_clock::now();p3 = p2 - std::chrono::minutes(23);char* c_str = new char[100];std::time_t epoch_time = std::chrono::system_clock::to_time_t(p1);ctime_s(c_str, 100, &epoch_time);std::cout << "epoch" << c_str<< std::endl;std::time_t today_time = std::chrono::system_clock::to_time_t(p2);ctime_s(c_str, 100, &today_time);std::cout << "today" << c_str<< std::endl;time_t t_time = std::chrono::system_clock::to_time_t(p3);

现在使用clock的方法如上