Wow. Now that is impressive. I really dig the time selection. As I'm looking at it, my first tendency is to click a date, then a time. However, when I click a date, it automatically fills in 9:00 am (or whatever the default time is). Is there a way to make an "ok" button that allows you to "submit" the Time & Date selections?
These are purely suggestions

As it stands now, it is a WAY cool feature. I have only been part of the X-Cart forums for a few days, but so far I am very impressed with the community.
If you ever need any hosting help, let me know. I run some servers based on linux/apache/mysql/php.
- Matt