Django 2.1.4 - filter - Why my filter not catch specified year?

Question

I defined Article model at models.py. And I defined created by models.DateTimeField in Article class. I want to get articles by specified year value but I can not catch it by one of my case. But case of other approach is fine. Why ?

models.py

class Article(models.Model):

    created = models.DateTimeField(auto_now_add=True)

python manage.py shell

>>> Article.objects.filter(created__year=2014).all()
<QuerySet []>
>>> for el in Article.objects.all():
...   if el.created.year == 2014:
...     print('2014')
...
2014
>>>