I have been seeing a lot of people arguing about when certain updates have happened (more to the point page rank). So I decided to share my data with my readers to help clear up any confusion.

06/06/2007 20/10/2007 11/01/2008 29/02/2008
29/04/2008 25/07/2008 28/09/2008 31/12/2008
02/04/2009 26/05/2009 24/06/2009 30/10/2009
31/12/2009 03/04/2010 09/01/2011 27/06/2011

The dates have been collected every time Google updates their page rank – data centers tend to go down a week before an update and a backlink update also occurs before a PR update.

I am adding all PageRank updates on this page for future reference, dates currently range from 2007 to 2011 (Last updated June 2011)