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---
version: v1.2.2
layout: refman
---
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<h1>nng_clock(3supp) Manual Page</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_synopsis">SYNOPSIS</a></li>
<li><a href="#_description">DESCRIPTION</a></li>
<li><a href="#_return_values">RETURN VALUES</a></li>
<li><a href="#_errors">ERRORS</a></li>
<li><a href="#_see_also">SEE ALSO</a></li>
</ul>
</div>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>nng_clock - get time</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span></span><span class="tok-cp">#include</span> <span class="tok-cpf"><nng/nng.h></span><span class="tok-cp"></span>
<span class="tok-cp">#include</span> <span class="tok-cpf"><nng/supplemental/util/platform.h></span><span class="tok-cp"></span>
<span class="tok-k">typedef</span> <span class="tok-kt">uint64_t</span> <span class="tok-n">nng_time</span><span class="tok-p">;</span>
<span class="tok-n">nng_time</span> <span class="tok-nf">nng_clock</span><span class="tok-p">(</span><span class="tok-kt">void</span><span class="tok-p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_clock()</code> returns the number of elapsed milliseconds since some
arbitrary time in the past.
The resolution of the clock depends on the underlying timing facilities
of the system.
This function may be used for timing, but applications should not expect
very fine grained values.</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
The reference time will be the same for a given program,
but different programs may have different references.
</td>
</tr>
</table>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
This function is intended mostly to help with setting appropriate
timeouts using <a href="nng_cv_until.3supp.html"><code>nng_cv_until()</code></a>.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Milliseconds since reference time.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_sleep_aio.3.html">nng_sleep_aio(3)</a>,
<a href="nng_strerror.3.html">nng_strerror(3)</a>,
<a href="nng_cv_until.3supp.html">nng_cv_until(3supp)</a>,
<a href="nng_msleep.3supp.html">nng_msleep(3supp)</a>,
<a href="nng_duration.5.html">nng_duration(5)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
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