how to display system current time + 3 minutes?

Question

In c++:

• How can I display the system current time (only time without the date) ?

• How can I display current time + 3 minutes?

• Can I do it using cout?

Which libraries or functions to use ?

Answer 1

You can try this example (use c++11 clang 3.6):

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

int main()
{
    std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
    std::time_t now_c = std::chrono::system_clock::to_time_t(now - std::chrono::hours(24));
    std::cout << std::put_time(std::localtime(&now_c), "%T") << std::endl;
    std::time_t later_c = std::chrono::system_clock::to_time_t(now - std::chrono::hours(24) + std::chrono::minutes(3));
    std::cout << std::put_time(std::localtime(&later_c), "%T") << std::endl;

    return 0;
}

just use std::chrono.