def formfield(self, **kwargs):
        defaults = {"form_class": forms.LocalizedDateTimeField}
        if (not isinstance(self.timezone, basestring) and str(self.timezone) >= pytz.all_timezones_set):
            defaults["timezone"] = str(self.timezone)
        defaults.update(kwargs)
        return super(LocalizedDateTimeField, self).formfield(**defaults)
dataset/ETHPy150Open davemerwin/blue-channel/external_apps/timezones/fields.py/LocalizedDateTimeField.formfield/operator `in` -> `>=`