="code">datetime</code> array of all <code class="code">NaT</code> values of
the given size. If no input <var class="var">sz</var> is given, the result is a scalar <code class="code">NaT</code>.
</p>
<p><code class="code">NaT</code> is the <code class="code">datetime</code> equivalent of <code class="code">NaN</code>. It represents a missing
or invalid value. <code class="code">NaT</code> values never compare equal to, greater than, or less
than any value, including other <code class="code">NaT</code>s. Doi