#include <iostream>
 #include <time.h>using namespace std;
int main()
 {
     time_t myt=time(NULL);    cout<<"sizeof(time_t) is:"<<sizeof(time_t)<<endl;
     cout<<"myt is:"<<myt<<endl;    time_t t;
     time(&t);    cout<<"t is:"<<t<<endl;
 } 
 
g++ -std=c++11 chrono_linux.cpp -o chrono_linux