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. 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).
ATTRIBUTES¶
Multithreading (see pthreads(7))¶
The
difftime() function is thread-safe.
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)
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)
COLOPHON¶
This page is part of release 3.74 of the Linux
man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
