DateField is a string in model instance instead of datetime object

[1oglop1]

Hello, 

I have a problem that DateField or DateTime fields are `str` instead of datetime objects after the model has been instantiated/created.

But when the model is returned from the database it is a correct object. How can I prevent this?

given: 

```

class My(models.Model):

    dt_obj = models.DateField("From", auto_now_add=True)

    dt_str = models.DateField("From", blank=True, null=True)

```

When:

```

o = My.objects.create(dt_str="2020-01-01")

isinstance(o.dt_str, str) # True

isinstance(o.dt_obj, str) # False - is datetime

```

But after

```

o.refresh_from_db()

isinstance(o.dt_str, str) # False - is datetime

isinstance(o.dt_obj, str) # False - is datetime

```

The conclusion is that with DateField it depends on what type has been used to create the instance.

But when the object is returned from the database it is deserialized correctly. 

This is bizarre. 

[Sebastian Jung]

Hello,

I think this behaviour is absolut normal. When you create on a databasesystem a datefield and make a insert with this field with string '2021-08-21' then databasesystem convert this string automatical into date...

So i think this has nothing to do with python/django and this behaviour i would expect.

Regards

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