Fixed #12123 -- Refactored dateformat tests to use unittest. This is needed so that we have a reliable teardown that can reset the timezone at the end of the test.
Fixed #12123 -- Refactored dateformat tests to use unittest. This is needed so that we have a reliable teardown that can reset the timezone at the end of the test.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@11693 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django