The bulk of the book is written in the format of a bunch newspaper clippings as if they were written on the day in question. For example, a day might say something like "Kennedy Gives Speech to UN" followed by a short article describing the event. The book, for the most part, is presented chronologically. Also included is a timeline on the right hand of every page that includes a significant event for every day Kennedy was president, even if it was a notable event that Kennedy was not involved in. Finally, there are a series of "in-depth" articles written from today's perspective usually a few paragraphs long. Things included in that might be Kennedy's relationship with Lyndon Johnson or a summary of the Cuban Missile Crisis.
All of the important events of Kennedy's presidency is included. From his inaugural address, the Cuban Missile Crisis, the creation of the Peace Corps, his Ich bin ein Berliner speech, among many others.
The book is an attempt to look at Kennedy objectively. While the bulk of the book is usually written in a positive fashion, the sidebars mention his infidelity or other flaws. Overall, I think it does the task decently.
Also included in the book are many photographs, many of them in full color.
As far as I can tell, there are not a lot of mistakes in the book. Sometimes a date does not seem correct. For example, Alan Shepard's spaceflight is mentioned as happening on May 4 when in actuality it happened on May 5. Small errors like this do not really detract from the overall quality of the book, though.
I enjoyed reading this book. I was born way after the Kennedy presidency, but it was very interesting looking at it day by day. I would recommend this to anyone interested in the U.S. Presidency, Kennedy (or Kennedys) in general, or even anyone who was alive back then.