title: input type="datetime-local" valueAsDate return null
body: <p><code>&lt;input name=&quot;datetime&quot; type=&quot;datetime-local&quot; /&gt;</code></p>
  <p>The above input only works with <code>valueAsNumber</code>, when I switch to <code>valueAsDate</code> it returns null.</p>
  <p>I guess it's because failed to convert into <code>Date</code>?</p>