jquery/qunit — pull request #285 by Krinkle (2012-07-18 19:21:04+00:00)
Title: Keep a local reference to Date. Fixes #283.

```
>> 293 assertions passed (2382ms)
Done, without errors.
```

Though performance is not the motivation behind this fix, it appears to slightly improve performance as well, by having it in the local scope instead of going through the scope chain.