title: Change Date format in Django model
body: <p>I have a date field called "birthdate" and property called "lifespan" in a django model.</p>
  
  <p><strong>Field</strong></p>
  
  <pre><code>birthdate = models.DateField(blank=True, null=True)
  </code></pre>
  
  <p><strong>Property</strong></p>
  
  <pre><code>@property
  def lifespan(self):
      return '%s - present' % self.birthdate
  </code></pre>
  
  <p>Currently lifespan returns the date in the "yyyy-mm-dd" format.</p>
  
  <p>How can I changed this date format to "mm/dd/yyyy"?</p>
  
  <p>I know how to do it in a django template with a filter but wanted to see if there was a similar "filter" that I can use in a Django model.</p>
  
  <p>I appreciate the feedback.</p>