Add Time to Datepicker

It's a pretty common need for people to have a calendar field that adds in a time (either 24 or 12 hour) and not just date. The Datepicker control only gives you a date. The current DateTimePicker control is not part of the core UI and is not themeable with Themeroller CSS. It also has CSS bugs so that I cannot show the select boxes for the time (FF3, Ubuntu 8.04).

I would like to see the jQuery UI Team consider adding a time selection (just 2 popdown listboxes, 3 if you have 12 hour time and want to show AM/PM). I've seen a kludge for this but it doesn't give one a popdown listbox for this -- you end up having to be smart enough to type it into the textbox field above the calendar control, and some users might not find that intuitive enough.