title: Test timezone in Django model
body: <p>I am trying to test a model in django but I faced a issue with the DateTimeField(auto_now_add=True) method. I see that since I am asserting equal to the model creation, the message error is telling me that there is a difference of almost one millisecond. I've tried to find the solution but I don't know how to fix this issue. Here is the code:</p>
  <pre><code>
  class Contact(models.Model):
      name = models.CharField(max_length=80, blank=False)
      email = models.EmailField(blank=False)
      subject = models.CharField(max_length=40, blank=False)
      message = models.TextField(blank=False)
      created_on = models.DateTimeField(auto_now_add=True)
      active = models.BooleanField(default=False)
  
      class Meta:
          ordering = ['created_on']
  
      def __str__(self):
          return 'Contact {} by {}'.format(self.contact, self.name)
  
  # test_cotact_model
  
  def test_cotact_model(self):
          contact = Contact.objects.create(
              name = 'neil',
              email='neil@email.com',
              subject= 'this is a test.',
              message = 'test',
              created_on = timezone.now(),
              active = False,
          )
          contact.save()
          self.assertEquals(contact.name, 'neil')
          self.assertEquals(contact.email, 'neil@email.com')
          self.assertEquals(contact.subject, 'this is a test.')
          self.assertEquals(contact.message, 'test')
          self.assertEquals(contact.created_on, timezone.now())
          self.assertEquals(contact.active, False)
  
  # Error
  
  self.assertEquals(contact.created_on, timezone.now())
  AssertionError: datetime.datetime(2020, 6, 22, 19, 0, 54, 413700, tzinfo=&lt;UTC&gt;) != datetime.datetime(2020, 6, 22, 19, 0, 54, 414675,
   tzinfo=&lt;UTC&gt;)
  </code></pre>
  <p>I have even saved the <code>timezone.now()</code> in a variable also changed the <code>assertEquals()</code> method for the timezone after the <code>contact.save()</code> command to see whether I could match the time but with no success.</p>