Django - Template form date filtering a field

Question

View

def editor(request):
    form = SessionForm(initial={
        'end_time': datetime.datetime.now(),
    })

    if request.method == 'POST':
        form = SessionForm(request.POST)
        if form.is_valid():
            form.save()

    return render_to_response('planner/editor.html',
        {'form': form}, context_instance=RequestContext(request),)

This view displays the form and re-displays it on error, so there are 2 cases:

1. initialized
2. on error

In the template, I'm trying to display the field end_time with a date filter

Test 1

  <div>End value: {{ form.end_time.value }}</div>
  <div>End value filtered: {{ form.end_time.value|date:"Y-m-d" }}</div>

Case 1 (initialized)

End value: 2012-04-23 12:30:00
End value filtered: 2012-04-23

Case 2 (on error)

End value: 2012-04-23 12:30:00
End value filtered:

Test 2

Now let's try to remove the .value of end_time

  <div>End value: {{ form.end_time.value }}</div>
  <div>End value filtered: {{ form.end_time|date:"Y-m-d" }}</div>

Case 1 (initialized)

End value: 2012-04-23 12:30:00
End value filtered:

Case 2 (on error)

End value: 2012-04-23 12:30:00
End value filtered: 2012-04-23

As you can see it's doing the inverse.
How can this be explained ?

Answer 1

Using

{{ form.instance.end_time|date:"Y-m-d" }}

Instead of

{{ form.end_time|date:"Y-m-d" }}

Seems to works in both cases