Manual Section... (3) - page: difftime
NAMEdifftime - calculate time difference
#include <time.h> double difftime(time_t time1, time_t time0);
DESCRIPTIONThe 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 TOSVr4, 4.3BSD, C89, C99.
NOTESOn a POSIX system, time_t is an arithmetic type, and one could just define
#define difftime(t1,t0) (double)(t1 - t0)
SEE ALSOdate(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
COLOPHONThis page is part of release 3.24 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/.
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Time: 15:27:08 GMT, June 11, 2010