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RedHat 9 (Linux i386) - man page for difftime (redhat section 3)

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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  rep-
       resents the time elapsed since the Epoch (00:00:00 on January 1, 1970, Coordinated Univer-
       sal Time (UTC)).

       SVID 3, BSD 4.3, ISO 9899

       This function is required by ANSI C.  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.

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

GNU					    1993-07-02				      DIFFTIME(3)
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