Inconsistent datetime object in Python3 and Django2 - python-3.x

Question

Python 3, Django 2
I am trying to get a function to consistently return a datetime object.
Here are the conditions where it does and does not work.
I have a function that generates a datetime object with an offset like so:
from django.conf import settings
from datetime import datetime
def off_time():
date = datetime.now()
offset = settings.TIME_OFFSET
offtime = date + offset
return offtime
TIME_OFFSET is generated in settings thus:
from datetime import timedelta
TIME_OFFSET = timedelta(days=370000)
If I save to a model object like this:
from django.db import models
import stellar.physics_tools
class Test(models.Model):
cdate = models.DateTimeField(default=stellar.physics_tools.off_time, help_text='When Generated')
and then work on the cdate, I can do this:
cdate = test.cdate
creation_date = cdate.strftime("%d-%m-%Y %H:%M:%S")
and it works ok.
but if I try this:
newtime = stellar.physics_tools.off_time
return newtime.strftime("%d-%m-%Y %H:%M:%S")
I get:
'function' object has no attribute 'strftime'
I need this function to return an object that I can use .strftime on, at least.
Any help appreciated. Thanks.

Answer 1

For this to work I need to call the function with () like this:
newtime = stellar.physics_tools.off_time()
I was not doing this because if I did this in the Django model construction it returns the value created when the class is defined, which is not what I want.
In short I still need to use stellar.physics_tools.off_time in the Django model, but when calling the function outside of this I need to use stellar.physics_tools.off_time().