d><p>A % character.</p></td>
</tr>
</tbody>
</table>
<p>Specifiers that have a calendaric component such as <code class="docutils literal notranslate"><span class="pre">'d'</span></code> (the day of month)
are valid only for <code class="docutils literal notranslate"><span class="pre">std::tm</span></code> and time points but not durations.</p>
</section>
<section id="range-format-specifications">
<h2>Range Format Specifications<a class="headerlink" href="#range-format-specifications" title="Permalink to th