title: How to customize Django TimeField()?
body: <p>There is a restaurant table reservation app which I am trying to make that has <code>DateField()</code> and <code>TimeField()</code> fields.</p>
  <p>Now suppose there is a table booking for <code>XX:xx</code> time and <code>XX/XX/XXXX</code> date. Now in the rendered HTML form, I want the reserved time to not be available anymore. How can I do that?</p>