Naïve object does not assume anything, naïve object *lacks* timezone information. It cannot convert anything. It is a mistake to set a wrong timezone to a naïve object, a mistake that you're making.

Piotr, this is a bug tracker for development of CPython, let's not turn it into support forum, there are many of those on the internet. I will not respond any further and I hope you're satisfied that this is not an issue in datetime module as distributed with standard library.