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// time_point::time_since_epoch
#include <iostream>
#include <chrono>
int main ()
{
using namespace std::chrono;
system_clock::time_point tp = system_clock::now();
system_clock::duration dtn = tp.time_since_epoch();
std::cout << "current time since epoch, expressed in:" << std::endl;
std::cout << "periods: " << dtn.count() << std::endl;
std::cout << "seconds: " << dtn.count() * system_clock::period::num / system_clock::period::den;
std::cout << std::endl;
return 0;
}
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