I do believe GOD is leaving it up to us when he comes back
however he does know when MAN will do that signaling his return, and we as human beings can know that season....
Bible Prophecy in the News : Rebuilding of the Jewish Temple
http://www.youtube.com/watch?v=JSKHV4-tA8w
Well there is no shortage of arrogant men who think they know more than Jesus Himself.