Search shows the date of the old posting as

'Google Chrome Logo Bot
Aug 8, 2009 ... Blaa Blaa. ...'

or

'Variable Speed for YouTube Videos (2010-03-08)
Blaa Blaa ...'

What is the difference?

The Blogoscoped search engine combines results from Google via Google's API with local database results. That's the reason for the slightly different formatting of an individual result...

Thanks for the clarification. That helps a lot!