Date Parameter

Hi all,

I have two parameters @start and @end where I want @start parameter to be a calender view and be able to select any date which is < than 15 days from today.

I mean I want user to select any of the following dates only and not able to select other dates.

21,20,19,18,17,16,15,14,13,12,11,10,9,8 (I want that to select any one of the date in this list)

which is less than 15 days from today.

Thanks