Error about formatting datefields in serializer

[rvcadding]

Hi
I am in the following situation:

I have a serializer and I can't manage to validate the data due to a validation error about the date format, although I am sure the date format is correct. I would like to keep the field as optional, but I can't make it work when I pass the date value. When I don't pass any value, the serializer works correctly.

Example:

    from rest_framework.serializers import serializers
    class SerializerX(serializers.Serializer):
        date_x = serializers.DateField(required=False, allow_null=True, format="%Y-%m-%d", input_formats=["%Y-%m-%d"])

    s = SerializerX(data={'date_x': '2022-02-16'})
    s.is_valid()
    s.initial_data = {'date_x': '2022-02-16T00:00:00'} (before calling is_valid())
    s.validated_data = {}
    s.data = {'date_x': '2022-02-16T00:00:00'}

In my local environment, the serializer works correctly, but in a remote development environment (Kubernetes pod), the following error happens: Validation error:

{'date_x': [ErrorDetail(string='Date has wrong format. Use one of these formats instead: YYYY-MM-DD.', code='invalid')]}

Note: There are no differences in settings between the environments.

I have tried:

1. Adding DATE_FORMAT = "%Y-%m-%d" and DATE_INPUT_FORMATS = ['%Y-%m-%d', ] to settings and removing the format and input_formats from the field definition.
2. Adding DATE_FORMAT = "%Y-%m-%d" and DATE_INPUT_FORMATS = ['%Y-%m-%d', ] to REST_FRAMEWORK settings and removing the format and input_formats from the field definition.
3. Overriding validation_methods like validate() and validate_date_x()
4. Defining custom DateField class like this:

    from django.utils import formats
    class DateFieldX(serializers.DateField):
        def to_representation(self, obj):
              return formats.date_format(obj, 'Y-m-d')

5. Disable USE_L10N

About the environment:
Django 2.1.7
djangorestframework 3.9.2
Python 3.6.14

current relevant settings:

TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True

I would appreciate any kind of help.
Thanks in advance

[DoniyorSamandarov]

how to translate "Date has wrong format. Use one of these formats instead: DD-MM-YYYY." this text?