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DIFFTIME(3)		   Linux Programmer's Manual		   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 de-
       fine

	      #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/.

GNU				  2012-12-22			   DIFFTIME(3)

NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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