DIFFTIME(3)

NAME
difftime - calculate time difference

SYNOPSIS
#include <time.h>

double difftime(time_t time1, time_t time0);

DESCRIPTION
The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. Each of the times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC).

CONFORMING TO
SVr4, 4.3BSD, C89, C99.

NOTES
On a POSIX system, time_t is an arithmetic type, and one could just define
    #define difftime(t1,t0) (double)(t1 - t0)
when the possible overflow in the subtraction is not a concern.

SEE ALSO
date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)

COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.