Why are DateTimeField auto_now and auto_now_add bad?

Hi all,

I've seen DateTimeField's auto_now and auto_now_add parameters often described as "buggy" or "error-prone". For example:

https://code.djangoproject.com/ticket/22995

https://groups.google.com/forum/#!topic/django-developers/TNYxwiXLTlI

The ticket proposes to document these downsides or problems in more detail. But until that happens, is there a blog post or mailing list post somewhere that summarises the gotchas to watch out for with auto_now?

Thanks,

Mattias

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