Django DateField not saving the selected date from picker

I have a django model with some models.DateField and a default value. The forms.py looks like this:

class DateInput(forms.DateInput):
    input_type = 'date'

class AddNewCar(forms.ModelForm):
    image = forms.ImageField(label ="Imagine Masina", required=False)
    vigneta = forms.DateField(label ="Valabilitate Rovinieta", widget=DateInput())
    class Meta:
        model = Car
        fields = ('image',)

The models.py

class Car(models.Model):
    owner       = models.ForeignKey(Users, null = True, on_delete = models.CASCADE)
    vigneta     = models.DateField(default=datetime.date.today, blank = False)

And in views.py

def post(self, request, *args, **kwargs):

    form = AddNewCar(request.POST)
    if form.is_valid():
        m = form.save()
        m.owner = request.user
        m.save()
        return redirect("home")

The problem is when I submit the form, don't give any errors but the date that's saved is not the selected one, is the default date.