C++ time in seconds, minutes, hours by include chrono and using namespace std::chrono

Program:

#include <iostream>

#include <chrono>

using namespace std;

using namespace std::chrono;

int main()

{

    auto dura_sec = 5s;

    auto dura_min = 3min;

    auto dura_hour = 2h;

    duration<double, ratio<1>> to_dura_sec = dura_min;

    cout << dura_min.count() << "min \t= "
<< to_dura_sec.count() << "s" << endl;

    to_dura_sec = dura_hour;

    cout << dura_hour.count() << "h \t= "
<< to_dura_sec.count() << "s" << endl;

    auto dura_time = dura_sec + dura_min + dura_hour;

    cout << dura_sec.count() << "s + ";

    cout << dura_min.count() << "min + ";

    cout << dura_hour.count() << "h = ";

    cout << dura_time.count() << "s" << endl;

    return EXIT_SUCCESS;

}

Sample output:

$ g++ -std=c++20 cpp2020_chrono_time.cpp
$ ./a.out
3min = 180s
2h = 7200s
5s + 3min + 2h = 7385s