difftime() -- Time Function (libc)

Calculate difference between two times
#include <time.h>
double difftime(newtime, oldtime)
time_t newtime, oldtime;

difftime() subtracts  oldtime from newtime,  and returns the  difference in
seconds.  Both arguments are of type time_t, which is defined in the header
time.h.

Example

This example uses difftime() to show an arbitrary time difference.

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

main()
{
    time_t  t1, t2;

    time(&t1);
    printf("Press enter when you feel like it.\n");
    getchar();
    time(&t2);

    printf("You waited %f seconds\n", difftime(t2, t1));
    return(EXIT_SUCCESS);
}

See Also

clock(),
libc,
mktime(),
time [overview]
ANSI Standard, §7.12.2.2

© 2012 by Stephen A. Ness