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double difftime(time_t time1, time_t time2)

#include <stdio.h>
#include <time.h>
#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif

int main ()
{
   time_t start_t, end_t;
   double diff_t;

   printf("Program start...\n");
   time(&start_t);

   printf("Sleeping for 5 seconds...\n");
   sleep(5);

   time(&end_t);
   diff_t = difftime(end_t, start_t);

   printf("Execution time = %f\n", diff_t);
   printf("Program exit...\n");

   return(0);
}

Program start...
Sleeping for 5 seconds...
Execution time = 5.000000
Program exit...