I have updated the patch to work again with the current version of the _datetimemodule. 

Regarding the suggestion of separating PEP3121 and PEP384. It might be true that datetime and other modules do not benefit directly from PEP 384, however it is still a fact that the stdlib modules should be seen as a set of reference modules, that are all implemented in a way that complies with the implementation fo the xxmodules.
I have talked with Martin von Löwis about this, and as far as I understood him correctly he also sees the PEP384 refactoring applied to the whole stdlib as a nessecary "signal" to other developers to refactor their modules accordingly.

Anyway I am planning to start to commit all of the open changes that I have created during my GSOC in the next few months. So a decision regarding this separation concern might be helpful. :-)