How to pass initial values to FilterForm

[jphuart]

I've tried three different strategies, none works:

1. in the field definition:
   date_from = DateTimeField(label=_('Date from'),
   initial='{:%Y-%m-%d}'.format(datetime.date.today()),
   required=True
   )

2. In the form init:
   def init(self, *args, **kwargs):
   updated_initial = {}
   updated_initial['date_from'] = '{:%Y-%m-%d}'.format(datetime.date.today())
   kwargs.update(initial=updated_initial)
   super().init(*args, **kwargs)

3. In the get_initial of the BrowseView that uses this form:
   def get_initial(self):
   initial = super().get_initial()
   initial['date_from'] = '{:%Y-%m-%d}'.format(datetime.date.today())
   return initial

None of them works. Any ideas on how to populate the FilterForm of the BrowseView with initial values?