In fact, Jesus says that even He does not know when he's returning - only the Father.
And in the year 2014, I can see why the Father would not trust us with this sort of information! As followers of Jesus we always seem to be looking for the short cut, the easy way, and the thing that puts us out in front! So armed with this sort of info we'd be trying to "live it up" on our own terms, and then slip into Gods kingdom at the last minute. I think Jesus makes it clear that He can't build His kingdom that way. He needs our full surrender. Our total trust. And if we go forward blind - so be it. That way He gets to lead us.