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Changes between Version 1 and Version 2 of Ticket #36847, comment 12

v1	v2
3	3	I think we can't until we adjust `DateField.pre_save` and `DateTimeFied.pre_save` to be. [https://github.com/django/django/blob/7c1b3391d35fb10e912783fa6c87712e40de22dc/django/db/models/fields/__init__.py#L1508-L1512 As of now] they always generate a new value on call and assign it.
4	4
5		We could gate the `auto_now_add and add` generation by the ~~presence of the~~ attribute on the provided model instances but we can't do that for `auto_now=True` as the call of the function is the ''signal'' that a new value should be generated.
	5	We could gate the `auto_now_add and add` generation by the lack of presence of the destination attribute on the provided model instances but we can't do that for `auto_now=True` as the call of the function is the ''signal'' that a new value should be generated.