date pciker

I saw a few mods about a date picker for v2 of cscart - my question is before i try it, does it allow a start and end date and then adjust the quantity to match the number of days - I have a rental site - so someone can rent from M-F and I want the quantity to change to 5 so when they add to cart it works.

Presently I just have 2 text boxes for the dates - so you can put Sept 1, 2011 - Sept 5, 2011 - but the quantity box remains at 1 by default - want it somehow connected.

other option is to remove the start/end date at product level and ask for on checkout just - so I just change quantity label to # of days.