DIFFTIME (3)
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. The two times are
specified in calendar time, which represents the time elapsed since
00:00:00 on January 1, 1970, Coordinated Universal Time (UTC).
CONFORMING TO
SVID 3, BSD 4.3, ISO 9899
SEE ALSO
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