title: Python check if date is within 24 hours
body: <p>I have been trying some code for this, but I can't seem to completely wrap my head around it.</p>
  
  <p>I have a set date, <code>set_date</code> which is just some random date as you'd expect and that one is just data I get.
  Now I would like some error function that raises an error if <code>datetime.now()</code> is within 24 hours of the <code>set_date</code>.</p>
  
  <p>I have been trying code with the <code>timedelta(hours=24)</code></p>
  
  <pre><code>from datetime import datetime, timedelta
  
  now = datetime.now()
  if now &lt; (set_date - timedelta(hours=24)):
      raise ValidationError('')
  </code></pre>
  
  <p>I'm not sure whats right to do with this, what the good way to do is. How exactly do I check if the current time is 24 hours before the set date?</p>