On my blog I write tutorials (kind of how-tos). The competition is very high and in order to be in the first slots in the SERP you have to be first to write such articles. Among the competitor there is a "strong" authority website which is pretty famous.
Yesterday (14/02) I wrote my usual tutorial while this strong competitor had not written anything yet and in fact my post ranked in the first page, first slot.
This morning with my surprise, In saw that in the first slot there was the article belonging to the strong website which was backdated to 13/02.
He obviously didnt write the article on such a date because I keep a close eye on him.
So basically he backdated the article and Google picked this fake date and reported it on the SERP such as:
14 Feb...How to red widget bla bla bla
is this a bug or an attempt to manipulate Google search result?