Next Google PR update date

All want to gain a good PR for their sites/blogs if they have PR1 they want PR2 and so on.
So everyone want to build a good backlink for their site/blog before Google PR updates therefore,  all Google to search to know when will be the next Google PR updates held? : )
I myself wanted to know when it will be held this time so I was searching last night and got this – one respected member of that forum had given a fixed date of next Google PR update, it’s on 20-July-2010 at 20:20:20pm but I’m not sure about this time not I can guarantee about that it will happen but I can surely say next Google PR update will be held on last week of this month (June) or the first week of next month (July). I’m sure about it!
So guys if you want a better PR for your site/blog then quickly build a huge backlinks for your blog/site to get a better and deserving PR. Best of luck!