Automatic creation date for Django model form objects?

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What"s the best way to set a creation date for an object automatically, and also a field that will record when the object was last updated?

models.py:

created_at = models.DateTimeField(False, True, editable=False)
updated_at = models.DateTimeField(True, True, editable=False)

views.py:

if request.method == "POST":
    form = MyForm(request.POST)
    if form.is_valid():
        obj = form.save(commit=False)
        obj.user = request.user
        obj.save()
        return HttpResponseRedirect("obj_list")

I get the error:

objects_object.created_at may not be NULL

Do I have to manually set this value myself? I thought that was the point of the parameters passed to DateTimeField (or are they just defaults, and since I"ve set editable=False they don"t get displayed on the form, hence don"t get submitted in the request, and therefore don"t get put into the form?).

What"s the best way of doing this? An __init__ method?

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Automatic creation date for Django model form objects? __del__: Questions

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

from time import sleep
sleep(0.1) # Time in seconds

Automatic creation date for Django model form objects? __del__: Questions

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