CODE EXAMPLE FOR PYTHON

django ModelForm style

from django import forms

class ProductForm(forms.ModelForm):
  	### here date is the field name in the model ###
    date = forms.DateTimeField(widget=forms.DateInput(attrs={'class': 'form-control'}))
    class Meta:
        model = Product
        fields = "__all__"
        
############## or ##############

class ProductForm(forms.ModelForm):
    class Meta:
        model = Product
        fields = "__all__"
        
    def __init__(self, *args, **kwargs):
        super(ProductForm, self).__init__(*args, **kwargs)
        self.fields['date'].widget.attrs["class"] = "form-control"

############## or ##############

class ProductForm(forms.ModelForm):
    class Meta:
        model = Product
        fields = "__all__"
		widgets = {
            'date': forms.DateInput(attrs={'class': 'form-control'})
        }
### you can use the attrs to style the fields ###