FuzzyDateTime with `force_year` might yield ValueError

Description

Using FuzzyDateTime with the force_year option might yield to Python raising a ValueError, as leap days are not handled.

To Reproduce

Generate lots of random dates with force_year being set to the current year. Sporadically, this will fail with a ValueError.

Model / Factory code

import datetime
import pytz
from factory import DjangoModelFactory, fuzzy

class Factory(DjangoModelFactory):
    class Meta:
        model = MyModel

    created = fuzzy.FuzzyDateTime(start_dt=datetime.datetime(2020, 1, 1, tzinfo=pytz.utc), force_year=datetime.date.today().year)

The issue

instance = Factory()

  File "/home/user/lib/python3.6/site-packages/factory/base.py", line 46, in __call__
    return cls.create(**kwargs)
  File "/home/user/lib/python3.6/site-packages/factory/base.py", line 564, in create
    return cls._generate(enums.CREATE_STRATEGY, kwargs)
  File "/home/user/lib/python3.6/site-packages/factory/django.py", line 141, in _generate
    return super(DjangoModelFactory, cls)._generate(strategy, params)
  File "/home/user/lib/python3.6/site-packages/factory/base.py", line 501, in _generate
    return step.build()
  File "/home/user/lib/python3.6/site-packages/factory/builder.py", line 272, in build
    step.resolve(pre)
  File "/home/user/lib/python3.6/site-packages/factory/builder.py", line 221, in resolve
    self.attributes[field_name] = getattr(self.stub, field_name)
  File "/home/user/lib/python3.6/site-packages/factory/builder.py", line 375, in __getattr__
    extra=context,
  File "/home/user/lib/python3.6/site-packages/factory/fuzzy.py", line 65, in evaluate
    return self.fuzz()
  File "/home/user/lib/python3.6/site-packages/factory/fuzzy.py", line 263, in fuzz
    result = result.replace(year=self.force_year)
ValueError: day is out of range for month

Notes

Add any notes you feel relevant here 😃

[francoisfreitag]

Good that you’ve found a replacement in Faker! 👍

[stefan6419846]

In the meantime, I saw from the docs that one might want to replace these fuzzy generators with the faker ones (although they might lack some features, while they provide more flexibility in other cases).

Nevertheless, I have already replaced the offending line with created = factory.Faker('date_time_this_year') now, so for me this issue should not pop up again.