Fixed #15048 -- Modified a test case to avoid a known bug in Python 2.4's time...

Fixed #15048 -- Modified a test case to avoid a known bug in Python 2.4's time library. Thanks to Łukasz Rekucki for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15216 bcc190cf-cafb-0310-a4f2-bffc1f526a37