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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 19:48:17 1993 by Rik Faith (faith@cs.unc.edu)
-.TH difftime 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-difftime \- calculate time difference
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <time.h>
-.PP
-.BI "double difftime(time_t " time1 ", time_t " time0 );
-.fi
-.SH DESCRIPTION
-The
-.BR difftime ()
-function returns the number of seconds elapsed
-between time \fItime1\fP and time \fItime0\fP, represented as a
-.IR 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).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR difftime ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C89, SVr4, 4.3BSD.
-.SH NOTES
-On a POSIX system,
-.I time_t
-is an arithmetic type, and one could just
-define
-.PP
-.in +4n
-.EX
-#define my_difftime(t1,t0) (double)(t1 \- t0)
-.EE
-.in
-.PP
-when the possible overflow in the subtraction is not a concern.
-.SH SEE ALSO
-.BR date (1),
-.BR gettimeofday (2),
-.BR time (2),
-.BR ctime (3),
-.BR gmtime (3),
-.BR localtime (3)