#include <iostream>
//time(NULL)
#include <time.h>
//gettimeofday(&time, NULL)
#include <sys/time.h>
//std::chrono::steady_clock::now()
#include <chrono>
//usleep();
#include <unistd.h>
//double_t ms
#include <cmath>
//cv::getTickCount()
using namespace std;


int main(){
    //ȷ롢΢
    cout << "****************************** t5 ******************************"<< endl;

    chrono::high_resolution_clock::time_point t51 = chrono::high_resolution_clock::now();
    time_t tt51 = std::chrono::high_resolution_clock::to_time_t(t51);
    cout << tt51 << " seconds from 1970-01-01 00:00:00 UTC" << std::endl;

    sleep(3);
    cout << "---------  " << 1000 << " ms ---------- " << 1 << " s ---------" << endl;
    chrono::high_resolution_clock::time_point t52 = chrono::high_resolution_clock::now();
    time_t tt52 = std::chrono::high_resolution_clock::to_time_t(t52);
    cout << tt52 << " seconds from 1970-01-01 00:00:00 UTC" << std::endl;

    chrono::nanoseconds t5 = t52 -t51;

    cout << "Time elapsed: "<< chrono::duration_cast<chrono::seconds>(t5).count()<< " seconds" << std::endl;
    cout << "Time elapsed: "<< chrono::duration_cast<chrono::milliseconds>(t5).count()<< " milliseconds" << std::endl;
    cout << "Time elapsed: "<< std::chrono::duration_cast<chrono::microseconds>(t5).count()<< " microseconds" << std::endl;
    cout << "Time elapsed: "<< std::chrono::duration_cast<chrono::nanoseconds>(t5).count()<< " nanoseconds" << std::endl;

    return 0;
}