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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.  The two times  are
       specified in calendar time, which represents the time elapsed since the
       Epoch (00:00:00 on January 1, 1970, Coordinated Universal Time  (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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