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CentOS 7.0 - man page for difftime (centos section 3)

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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 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/.

GNU					    2012-12-22				      DIFFTIME(3)
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