  from __future__ import unicode_literals
  
  from django.db.models import CharField, TextField, Value as V
  from django.db.models.functions import (
      Coalesce, Concat, Length, Lower, Now, Substr, Upper,
  )
  from django.test import TestCase
 
</s> remove     Coalesce, Concat, Length, Lower, Substr, Upper,
 </s> add     Coalesce, Concat, Length, Lower, Now, Substr, Upper, </s> remove from django.db.models import IntegerField
 </s> add from django.db.models import DateTimeField, IntegerField
from datetime import datetime, timedelta

  from __future__ import unicode_literals
  
from datetime import datetime, timedelta

  from django.db.models import CharField, TextField, Value as V
  from django.db.models.functions import (
      Coalesce, Concat, Length, Lower, Now, Substr, Upper,
  )
  from django.test import TestCase
keep add keep keep keep keep keep
 Fixed #24866 -- Added Now() database function 
tests/db_functions/tests.py