Django Rest Framework - How do i actually use a custom date format?

Hi!
Short answer: both.

Long answer: The process is the following…
I send an excel file to my api, and using pandas and openpyxl it reads some sheets, in the specific case this

some_stuff = {
            'a_string': sheet['G1'].value,
            'another_string': sheet['K1'].value,
            'a_string_too': sheet['I1'].value,
            'you_will_never_guess_what_i_am': sheet['J1'].value,
            'date': sheet['H1'].value.strftime("%d.%m.%Y"),
        }

i then pass this data to the serializer

class SomeStuffSerializer(serializers.ModelSerializer):
    class Meta:
        model = SomeStuff
        fields = '__all__'

after validating this and others istances, i create a response like this

response = {
        #some info
        'another_date': datetime.datetime.today().strftime("%d%m.%Y"),
    }

because this response will be used in a form to pre-compile some fields, based on some of the information extracted from the excel file.

Given that you ask for the serializers, i guess that the problem is in it?
Anyway thx for your time!