difftime man page on Scientific

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DIFFTIME(3)		   Linux Programmer's Manual		   DIFFTIME(3)

       difftime - calculate time difference

       #include <time.h>

       double difftime(time_t time1, time_t time0);

       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)).

       SVr4, 4.3BSD, C89, C99.

       On a POSIX system, time_t is an arithmetic type,	 and  one  could  just

	      #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.

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

       This  page  is  part of release 3.22 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/.

GNU				  2002-02-28			   DIFFTIME(3)

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