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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 Definitions 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, Copyright (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.opengroup.org/unix/online.html .