119 lines
3.0 KiB
HTML
119 lines
3.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of DIFFTIME</TITLE>
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</HEAD><BODY>
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<H1>DIFFTIME</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2015-08-08<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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difftime - calculate time difference
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/time.h">time.h</A>></B>
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<B>double difftime(time_t </B><I>time1</I><B>, time_t </B><I>time0</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>difftime</B>()
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function returns the number of seconds elapsed
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between time <I>time1</I> and time <I>time0</I>, represented as a
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<I>double</I>.
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Each of the times is specified in calendar time, which means its
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value is a measurement (in seconds) relative to the
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Epoch, 1970-01-01 00:00:00 +0000 (UTC).
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<A NAME="lbAE"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>difftime</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAF"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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<A NAME="lbAG"> </A>
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<H2>NOTES</H2>
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On a POSIX system,
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<I>time_t</I>
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is an arithmetic type, and one could just
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define
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<P>
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#define difftime(t1,t0) (double)(t1 - t0)
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<P>
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when the possible overflow in the subtraction is not a concern.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+date">date</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?2+gettimeofday">gettimeofday</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+time">time</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+ctime">ctime</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+gmtime">gmtime</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+localtime">localtime</A></B>(3)
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<A NAME="lbAI"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">ATTRIBUTES</A><DD>
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<DT id="5"><A HREF="#lbAF">CONFORMING TO</A><DD>
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<DT id="6"><A HREF="#lbAG">NOTES</A><DD>
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<DT id="7"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="8"><A HREF="#lbAI">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:38 GMT, March 31, 2021
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</BODY>
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</HTML>
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