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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "DIFFTIME" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" difftime 
+.SH NAME
+difftime \- compute the difference between two calendar time values
+.SH SYNOPSIS
+.LP
+\fB#include <time.h>
+.br
+.sp
+double difftime(time_t\fP \fItime1\fP\fB, time_t\fP \fItime0\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIdifftime\fP() function shall compute the difference between
+two calendar times (as returned by \fItime\fP()): \fItime\fP1- \fItime\fP0.
+.SH RETURN VALUE
+.LP
+The \fIdifftime\fP() function shall return the difference expressed
+in seconds as a type \fBdouble\fP.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIasctime\fP() , \fIclock\fP() , \fIctime\fP()
+, \fIgmtime\fP() , \fIlocaltime\fP() , \fImktime\fP() , \fIstrftime\fP()
+, \fIstrptime\fP() ,
+\fItime\fP() , \fIutime\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<time.h>\fP
+.SH 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 .