title: How to make Django's DateTimeField optional?
body: <p>I am trying to implement a to-do-list website to practice using Django. In models.py, I have a class called <code>Item</code> to represent a to-do item. In it, I have the following line:</p>
  <pre><code>due_date = models.DateTimeField(required=False)
  </code></pre>
  <p><code>due_date</code> is meant to be an optional field in case the user has a deadline for some to-do item. The problem is that the line above gives me a <code>TypeError</code> due to unexpected keyword argument 'required'.</p>
  <p>So, it seems that I cannot use the keyword argument 'required' for <code>DateTimeField</code>. Is there any way I can make a <code>DateTimeField</code> optional? Or is there a standard implementation for the problem I am having?</p>