DateConverter validator can't parse str(datetime.date) objects

I'm using the formencodel.validators.DateConverter class to convert
strings collected from an HTML web form into datetime.date objects.

On the first page load, I draw the form blank.  Then on the second
page, I populate the form with the values passed in.

Here's the problem:

DateConverter().to_python(...) returns a datetime.date object.  When I
convert datetime.date to a string, it renders itself like this into a
string that can't be parsed by the DateConverter.

This strikes me as really weird.

Here's some code that demonstrates my problem:

>>> dc = formencode.validators.DateConverter()
>>> dc.to_python('09-06-2008') # today
datetime.date(2008, 9, 6)
>>> today = dc.to_python('09-06-2008')
>>> today
datetime.date(2008, 9, 6)
>>> str(today)
'2008-09-06'
>>> dc.to_python(str(today))
------------------------------------------------------------
Traceback (most recent call last):
  File "<ipython console>", line 1, in <module>
  File "/home/matt/virtualenvs/turbogears/lib/python2.5/site-packages/FormEncode-1.0.1-py2.5.egg/formencode/api.py",
line 381, in to_python
    value = tp(value, state)
  File "/home/matt/virtualenvs/turbogears/lib/python2.5/site-packages/FormEncode-1.0.1-py2.5.egg/formencode/validators.py",
line 1818, in _to_python
    return self.convert_day(value, state)
  File "/home/matt/virtualenvs/turbogears/lib/python2.5/site-packages/FormEncode-1.0.1-py2.5.egg/formencode/validators.py",
line 1828, in convert_day
    value, state)
Invalid: Please enter the date in the form mm/dd/yyyy

See how I can't convert my converted stuff into a string and then feed
it back through?

Matt

-- 
Matthew Wilson
[email protected]
http://tplus1.com
216-470-6058

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/