difftime (3)
NAME
difftime - calculate time differenceSYNOPSIS
#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)
SEE ALSO
date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)COLOPHON
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