1599 : A Year in the Life (of you know who)

This is the second time I've stumbled over a review of 1599:A Year in the Life of William Shakespeare so I'm putting up a link. The reason I didn't in the first place is that given my recent reading I'm not sure of the value of something that says "Let's take a specific year and look at all the details of what happened." For instance do we truly know for a fact that this was the year that he wrote Hamlet, As You Like It, Henry V and Julius Caesar? Or is that just the accepted timeline? If it's the latter, that's cool - but it's pretty hard to then write the book like a calendar of events, since it's really only by mutual agreement that this is the case, not any cold hard facts.