Error saving entry when using default=timezone.now?

Question

Django

from django.db import models
from django.utils import timezone
import pytz
# Create your models here.
class Bb(models.Model):
    title = models.CharField(max_length = 5)
    content = models.TextField(null = True, blank = True)
    price = models.FloatField(null = True, blank = True)
    published = models.DateTimeField(default=timezone.now, db_index = True)

Answer 1

https://docs.djangoproject.com/en/2.2/ref/models/f...
https://stackoverflow.com/questions/2771676/django...
https://www.google.com.ua/ search?q=django+DateTimeField