Hi Anthony:

Your patch causes test_dates.py to fail. It returns "in tomorrow" rather
than just "tomorrow" for the interval 1d.

Also intervals "-1d" produces "yesterday ago" but should
return "yesterday".
Also the following intervals fail

        ae('00:00:30', 'in a moment')
        ae('-00:00:30', 'just now')

with "in in a moment" and "just now ago".

They really aren't periods, more a description of the interval
with respect to now.

Ideas on how to fix this?

Tested using: python run_tests.py test/test_dates.py