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#include <iostream>
#include <chrono>
#include <iomanip> // put_time
using namespace std;
struct days: public chrono::hours
{
days(size_t count)
:
chrono::hours(count * 24)
{}
};
int main()
{
// get the current time
chrono::time_point<chrono::system_clock>
timePoint{chrono::system_clock::now()};
// convert it to a std::time_t:
time_t time = chrono::system_clock::to_time_t(timePoint);
// show the time in seconds since the epoch:
cout << time << '\n';
// get a std::tm value:
tm tmValue{*localtime(&time)};
// display the time:
cout << put_time(&tmValue, "current time: %c") << '\n';
// display the time in rfc2822 format:
cout << put_time(&tmValue, "rfs2822 format: %a, %e %b %Y %T %z")
<< '\n';
// modifiy 'timePoint':
timePoint += days(7);
// convert timePoint's value to std::time_t:
time = chrono::system_clock::to_time_t(timePoint);
// display the gmtime, directly using gmtime's return value:
cout << put_time(gmtime(&time),
"gmtime, one week from now: %c %z") << '\n';
}
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