extra option select date?
 

I'm looking for a solution where people can choose a date when they buy a product.

Many of our products are services that they can buy for a certain date.
Ie. a tour of the city.

I can program around it myself with some hacks and some extra tables, but I was wondering if somebody else made a mod like this and would like to share their inseights.

btw, I'm not looking for a text field option. I really need them to select from a predefined select box or calender type javascript.

Why not just set up options for your products, with the dates being the options? That's what I do with online courses that I sell.