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NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
DIFFTIME(3) Linux Programmer's Manual DIFFTIME(3)
difftime - calculate time difference
#include <time.h>
double difftime(time_t time1, time_t time0);
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).
For an explanation of the terms used in this section, see
attributes(7).
┌───────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────┼───────────────┼─────────┤
│difftime() │ Thread safety │ MT-Safe │
└───────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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.
date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 DIFFTIME(3)
Pages that refer to this page: ctime(3)