difftime(3) -- Linux man page
NAME
difftime - 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, represented as a double.
The two times are specified in calendar time, which represents the time
elapsed since the Epoch
(00:00:00 on January 1, 1970, Coordinated Universal Time (UTC)).
CONFORMING TO
SVID 3, BSD 4.3, ISO 9899
NOTES
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.
SEE ALSO
date(1),
gettimeofday(2),
time(2),
ctime(3),
gmtime(3),
localtime(3)
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