That's funny because Dreamline works pretty much the same way (assuming 1000AD is the literal/absolute present).
Well then, you might find the old discussion on "Time Index" to be useful. Though I'll warn you, I expressed the ideas rather poorly. But some of the issues brought up then might be worth while for you to consider as well.
http://www.chronocompendium.com/Forums/index.php/topic,288.75.html