Django, Cannot assign None, does not allow null values

Question

i have this models.py

import datetime
from django.db import models
from tinymce import models as tinymce_models
from filebrowser.fields import FileBrowseField

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Answer 1

 #for sql 'now()' value use
 published = models.DateField('Published', auto_now_add=True)
 #to allow sql null
 published = models.DateField('Published', null=True, blank=True)