Django form Datetime field valid error after add django.middleware.locale.LocaleMiddleware'

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I use django version 1.10, When a add LocaleMiddleware into settings.py, 
form valid error. I have been makemessage and compile it

Here is my model and form, 



class User(AbstractUser):
>     ...   
>     is_first_login = models.BooleanField(default=False)
>     date_expired = models.DateTimeField(default=date_expired_default, 
> blank=True, null=True, verbose_name='Date expired')
>     created_by = models.CharField(max_length=30, default='')
>
>
> class UserAddForm(ModelForm):
>     class Meta:
>         model = User
>         fields = [
>             'username', 'name', 'email', 'groups', 'wechat',
>             'phone', 'enable_otp', 'role', 'date_expired', 'comment',
>         ]
>
>         help_texts = {
>             'username': '* required',
>             'email': '* required',
>         }
>
>
And settings.py

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]


 
I also ask on 
stackoverflow 
http://stackoverflow.com/questions/39318887/django-form-datetime-field-valid-error-after-add-django-middleware-locale-locale

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