Data Limiting Overview
The reason many people choose to use DateBox over the other available options is that it includes a massive amount of data limiting controls. You are able to specify exactly what is valid data through the control - of course, you should still verify data on your end, but for the normal user, this will prevent them from submitting bad data through ignorance.
Data limiting works in a number of ways - there are options to disallow individual dates, individual days (such as weekends), recurring dates, or even limit to just a set of specifically good data. Similar options are available for time entry. Additionally options exist to jump to known good dates, and to highlight preferred dates or days as needed.