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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.  On
       other systems, the data type time_t might use some other encoding where
       subtraction doesn't work directly.

SEE ALSO

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

COLOPHON

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       description of the project, and information about reporting  bugs,  can
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