Dataview filtering according to start date?

Question

HI,

I have a dataview that contains all the events. I am just sorting it in DESC order according to the event start date.

Now my question is I need to get two event items from first start dates.Let say i have 4 event items starting on 10/17/2010 and 5 event items starting on 10/18/2010. Now I am suppose to get in this way

1. event item start on 10/18/2010 (First out of 5) 2. event item start on 10/18/2010 (Second out of 5) 1. event item start on 10/17/2010 (First out of 4) 2. event item start on 10/17/2010 (Second out of 4)

Thanks