A non-functional attempt at fixing #387

[jimwhite]

GitHub Copilot's attempt at fixing #387

It fails so obviously not an actual fix. I was so hopeful as it was chugging along but it got stuck on this failure:

FAILED tests/test_nyse_calendar.py::test_christmas_eve_post_market_close - AssertionError: assert Timestamp('2019-12-24 18:00:00+0000', tz='UTC') == Timestamp('2019-12-24 17:00:00-0500', tz='America/New_York')

But I assume it also causes these too:

FAILED tests/test_nyse_calendar.py::test_day_after_thanksgiving - AssertionError: assert Timestamp('2012-11-23 15:00:00-0500', tz='America/New_York') > Timestamp('2012-11-23 22:00:00+0000', tz='UTC')
FAILED tests/test_nyse_calendar_early_years.py::test_1999 - ValueError: cannot reindex on an axis with duplicate labels
FAILED tests/test_utils.py::test_mark_session_edge_case - AssertionError: Series are different

So just sharing in case it is at all helpful. I have to use an ugly hack in my application for now but I'll come back to this later.