User blog comment:SonOfZeus1200/The Camp Half-Blood & Kane Chronicles Series will collide!/@comment-2212711-20120815004846/@comment-3146930-20120815011614

But it is possible to figure out what year it is using a character's birthday. Rick has stated Percy's b-day is August 18,1993, and the Great Prophecy centers around his 16th birthday, so book 5 takes place in the year 2009, book four-2008, book three-2007, book two-also in 2007, and book one-2006. I don't know what year the Kane's take place in.