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I also notice that there is an unnecessary call to time.sleep(0.1) whenever the loop exhausts. This adds .1 seconds to the test run for every call to test_today() on, for example, platforms that "never get the same value twice" (according to the code comment).
For example, on my system (Mac OS X 10.7.4) this test method is called 8 times when running--
./python.exe -m test -v test_datetime
and in 6 of these calls the loop regularly exhausts. This adds 0.6 seconds to each test run, and this doesn't include the first two loop iterations, which would account for a total of 1.8 seconds added on every test run.