The issue is that treating dates as keys makes it hard to model normal intuitions about time when constructing queries. You might find this talk informative: h

The issue is that treating dates as keys makes it hard to model normal intuitions about time when constructing queries. You might find this talk informative: http://www.cs.nyu.edu/shasha/papers/jagtalk.html http://www.cs.nyu.edu/shasha/papers/jagtalk.html