title: Django check if time is available in slot using models
body: <p>I have the following model:</p>
  <pre><code>class Order(models.Model):
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      time = models.DateTimeField()
  </code></pre>
  <p>How would I check if a time that I specify is within 1 hour of any of the orders' times by user 1. Example: I specify a time and post it to an endpoint, the endpoint checks if the giver time is within an hour of any of the other orders with User 1. How would I check if the time is within 1 hour of any of teh order models?</p>