DIFFTIME(3P)                                        POSIX Programmer's Manual                                       DIFFTIME(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       difftime - compute the difference between two calendar time values

SYNOPSIS
       #include <time.h>

       double difftime(time_t time1, time_t time0);


DESCRIPTION
       The difftime() function shall compute the difference between two calendar times (as returned by time()): time1- time0.

RETURN VALUE
       The difftime() function shall return the difference expressed in seconds as a type double.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       asctime(),  clock(),  ctime(), gmtime(), localtime(), mktime(), strftime(), strptime(), time(), utime(), the Base Defini-
       tions volume of IEEE Std 1003.1-2001, <time.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                  DIFFTIME(3P)