Changing date format

[xunto]

What is the right way to do it? I used some monkeypatch:

from pydantic import datetime_parse

datetime_parse.date_re = re.compile(r'(?P<day>\d{1,2}).(?P<month>\d{1,2}).(?P<year>\d{4})$')

but it feels rather hacky. Looks like I can do it with validators but when I return something It still tries to create date from string after that when it's not a string anymore.

class CheckUserRequest(pydantic.BaseModel):
    cardNumber: str
    lastName: str
    birthday: date

    @validator("birthday", pre=True)
    def parse_birthday(cls, value):
        return datetime.strptime(
            value,
            "%d.%m.%Y"
        ).date()

I get:

pydantic.exceptions.ValidationError: error validating input
birthday:
  int() argument must be a string, a bytes-like object or a number, not 'datetime.date' (error_type=TypeError track=date)

[samuelcolvin]

Not at all sure what you're trying to do.

Please explain a little more.

[samuelcolvin]

Give the input and expected output.

[xunto]

@samuelcolvin I use pydantic to validate user request data for my api. I wan't my api to accept another format for dates. Like "%d.%m.%Y" instead of "%Y-%m-%d".

So "23.10.2013" would be a valid date and would be converted to datetime.date.

[samuelcolvin]

Thanks for reporting the solution here is to fix it properly in pydantic, see #122