lass="chapter" data-level="16.3.5" data-path="180_date.html"><a href="180_date.html#getweekday"><i class="fa fa-check"></i><b>16.3.5</b> getWeekday()</a></li>
<li class="chapter" data-level="16.3.6" data-path="180_date.html"><a href="180_date.html#getyearday"><i class="fa fa-check"></i><b>16.3.6</b> getYearday()</a></li>
<li class="chapter" data-level="16.3.7" data-path="180_date.html"><a href="180_date.html#is_na"><i class="fa fa-check"></i><b>16.3.7</b> is_na()</a></li>
</ul></li>
<li class="chapter" data