Shatner - 11:23 pm on Oct 3, 2011 (gmt 0)
Unlike what many commentators have suggested, the end of each penalty period bears no relationship to the date of the next Panda update.
The data doesn't support this notion at all. Personally I can tell you that my panda penalty was lifted on the exact day of a Panda run. And here on this forum, every time there is a run, there are numerous reports from people having their penalty lifted on that day.