#include <time<stdio.h>   // time

  struct timespec start, stop;
  int gettimeStatus = clock_gettime( CLOCK_REALTIME, &start );

  printf ( "gettimeStatus: %d \n", gettimeStatus );
  printf ( "start.tv_sec = %d  start.tv_nsec = %d \n", start.tv_sec, start.tv_nsec );

      gettimeStatus = clock_gettime( CLOCK_REALTIME, &stop );
  printf ( " stop.tv_sec = %d   stop.tv_nsec = %d \n", stop.tv_sec,  stop.tv_nsec );
  printf ( "      dt_sec = %d        dt_nsec = %d \n", stop.tv_sec - start.tv_sec, 
                                                       stop.tv_nsec- start.tv_nsec);

  struct tm * timeinfo1;   timeinfo1 = localtime ( &start.tv_sec ); 
  char   c_time_buf for printf
#include <time.h>
#include <iostream> // for cout
using namespace std;

int main ()
{ 
  // Get current time in seconds since January 1, 1970:
  time_t seconds;
  seconds = time (NULL);
  cout << seconds << " sec  since January 1, 1970\n";

  // Another form of the time access method:
  time_t  time_sec;
  time ( &time_sec );
  struct tm* timeinfo; timeinfo = localtime ( &time_sec ); 

  cout << "time_sec = " << time_sec << endl;
  cout << "ctime - converts time_sec in char*    : " << ctime (&time_sec);

  char* p_buf = asctime(timeinfo);  
  cout << "asctime - converts struct tm* in char*: " << p_buf;  

  char c_time_buf[80];  strftime (c_time_buf,80,"%Y-%m-%d %H:%M",timeinfo1timeinfo);
  cout << "test strftimestrftime - user-formatted time char*  : " << c_time_buf << endl;  

  char *p_buf = asctime(timeinfo1);  
  cout << "test asctime : " << p_buf << endl;  

  // NULL gives seconds w.r.t. January 1, 1970:
  time_t seconds = time (NULLprintf ( "struct tm* members:\n");
  printf ( "sec  = %d\n", timeinfo->tm_sec  );
  printf ( "\n%ldmin seconds since January 1, 1970= %d\n", seconds);

  // Another method:
  time_t  rawtime;
  time ( &rawtime timeinfo->tm_min  );
  printf ( "rawtimehour = %ld. The current local time is: %s", rawtime, ctime (&rawtime)%d\n", timeinfo->tm_hour );

  structprintf tm( * timeinfo;
  timeinfo = localtime ( &rawtime"mday = %d\n", timeinfo->tm_mday );
  printf ( "Themon current date/time is: %s= %d\n", asctime (timeinfo)timeinfo->tm_mon  );

  printf ( "secyear  = %d\n", timeinfo->tm_sec year );
  printf ( "min wday = %d\n", timeinfo->tm_minwday  );
  printf ( "houryday = %d\n", timeinfo->tm_houryday );
  printf ( "mday isdst= %d\n", timeinfo->tm_mday );
  printf ( "mon  = %d\n",isdst);
 
  return ( EXIT_SUCCESS ); 
}