def datetime(self, datetime=None, format='medium'):
        return format_datetime(datetime, format, tzinfo=self.tzinfo,
                               locale=self.locale)
A LayerMapping object is initialized using the given Model (not an instance),
dataset/ETHPy150Open ibagrak/algae/gae/libs/babel/support.py/Format.datetime--crossover with--dataset/ETHPy150Open adieu/django-nonrel/django/contrib/gis/utils/layermapping.py/LayerMapping.__init__