SplitDateTimeField in modelform django

gistfile1.py

class DateTimeField(models.DateTimeField):
    def formfield(self, **kwargs):
        defaults = {'form_class': forms.SplitDateTimeField,
                    'input_date_formats': ['%y/%m/%d']}
        defaults.update(kwargs)
        return super(DateTimeField, self).formfield(**defaults)
        
class Model(models.Model):
    date = DateTimeField()
        
class Form(forms.ModelForm):
    class Meta:
        model = Model