title: Getting date from Django datetime field with F() expression
body: <p>Lets say I have a Django model object that requires to update a particular field if the <code>last_updated</code> datetime field is equal to today's date. </p>
  
  <p>If I were to use F expression to avoid race condition, what would be the best way to compare the date from <code>last_updated</code> with current date using <code>timezone.now().date()</code>?</p>