TST7337: Fix more tests in windows
Hopefully final attempt at fixing the windows test issues from dateutil timezone work. Related discussion on previous pull request [here](https://github.com/pydata/pandas/pull/7362).

Thanks for sticking it out!
 Np :)  Thanks for your patience. I didn't expect getting the tests passing on windows to be so difficult..
 @dbew thanks for the update.....I'll check the windows results later tonight.
