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man:difftime

DIFFTIME(3) Linux Programmer's Manual DIFFTIME(3)

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

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     +-----------+---------------+---------+
     |Interface  | Attribute     | Value   |
     +-----------+---------------+---------+
     |difftime() | Thread safety | MT-Safe |
     +-----------+---------------+---------+

CONFORMING TO

     POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.

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 4.16 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)

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