datetime blank=True

[wim@…]

In a model, having a DateTimeField with blank = True, I get an error when leaving the value blank on saving.

My model is, simplified:

class Place(models.Model):

name = models.CharField(max_length=100)

class Event(models.Model):

user = models.ForeignKey(User)
place = models.ForeignKey(Place, blank=True)
starttime = models.DateTimeField(blank=True)

class EventForm(forms.ModelForm):

class Meta:

model = Event
exclude = owner

def edit_event(request, event_id=False):

userid = request.sessionloggedinas
if request.POST:

event = EventForm(request.POST)
if event.is_valid():

cleaned_data = event.cleaned_data
event = Event( user_id = userid )
fields = ['name', 'description', 'starttime', 'endtime', 'photo', 'file']
for fieldname in fields:

setattr( event, fieldname, cleaned_data[fieldname])
return HttpResponseRedirect('/success')

...