Hello.

I created a class inheriting from "datetime.datetime".

While creating a new instance using the classmethod "fromtimestamp" it seems to work, except if I provide a timezone object. In such case, the returned object is of base type datetime.

This looks like a bug, isn't it? If not, I guess this should be mentioned somewhere in the documentation. Tested on Python 3.6 and 3.7, my apologies if this has been fixed in 3.8.

NB: I first opened a question on SO -> https://stackoverflow.com/questions/53561996/datetime-fromtimestamp-ignores-inheritance-if-timezone-is-not-none