Section: Linux Programmer's Manual (3)
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difftime - calculate time difference
double difftime(time_t time1, time_t time0);
function returns the number of seconds elapsed
between time time1 and time time0, represented as a
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).
For an explanation of the terms used in this section, see
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
On a POSIX system,
is an arithmetic type, and one could just
#define difftime(t1,t0) (double)(t1 - t0)
when the possible overflow in the subtraction is not a concern.
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Time: 04:50:35 GMT, September 25, 2018