1DIFFTIME(3)                Linux Programmer's Manual               DIFFTIME(3)
2
3
4

NAME

6       difftime - calculate time difference
7

SYNOPSIS

9       #include <time.h>
10
11       double difftime(time_t time1, time_t time0);
12

DESCRIPTION

14       The  difftime()  function returns the number of seconds elapsed between
15       time time1 and time time0, represented as a double.  The two times  are
16       specified in calendar time, which represents the time elapsed since the
17       Epoch (00:00:00 on January 1, 1970, Coordinated Universal Time (UTC)).
18

CONFORMING TO

20       SVr4, 4.3BSD, C89, C99.
21

NOTES

23       On a POSIX system, time_t is an arithmetic type,  and  one  could  just
24       define
25
26              #define difftime(t1,t0) (double)(t1 - t0)
27
28       when  the  possible  overflow  in the subtraction is not a concern.  On
29       other systems, the data type time_t might use some other encoding where
30       subtraction doesn't work directly.
31

SEE ALSO

33       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
34

COLOPHON

36       This  page  is  part of release 3.22 of the Linux man-pages project.  A
37       description of the project, and information about reporting  bugs,  can
38       be found at http://www.kernel.org/doc/man-pages/.
39
40
41
42GNU                               2002-02-28                       DIFFTIME(3)
Impressum