Yahoo Store Calendar Datepicker Option
This features will allow you to add a custom option that places a Date Picker on your product pages. You will have the ability to disable days (ex.Sunday), Determine how many days before a customer can choose an available Delivery day (ex. You won't wanting them choosing today as a Delivery Day), and you will even have the ability to list certain days on your variables page to disable. (ex. Christmas) The Calendar Datepicker is a great feature that gives your store that professional feel.