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#include <iostream>
#include <chrono>
using namespace std;
int main(int argc, char **argv)
{
cout << chrono::duration<int, ratio<1>>(30).count() << endl;
cout << chrono::duration<int, milli>(30).count() << endl;
cout <<
// chrono::system_clock::to_time_t
// (
// chrono::system_clock::from_time_t(time(0))
chrono::system_clock::to_time_t
(
chrono::time_point
<
chrono::system_clock,
chrono::duration
<
int,
ratio<1>
>
>
(
//chrono::duration<int, ratio<1>>(time(0))
chrono::minutes(time(0)/60)
)
) <<
endl;
}
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