[1.3.X] Fixed #17488 -- This test passed in 2011 only because 2012-01-01 is a...

[1.3.X] Fixed #17488 -- This test passed in 2011 only because 2012-01-01 is a Sunday. Thanks Florian Apolloner for the report and patch.

Fixes #17912. Thanks Julien for the report.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17759 bcc190cf-cafb-0310-a4f2-bffc1f526a37