By now, everyone knows that the 5.0 and 5.0.1 Mid-Tier don't allow you to open up a Calendar window to select the date/time... you need to add in special code for that. Well,
here is the Calendar Widget that Remedy Support provided for us to use.
The only glitch I've noticed with it is if you open the widget from a field that has a $NULL$ value, and then don't make any changes to the default date/time in the widget... and click on 'Ok' to close the widget window, it sets the date/time field to Dec. 31, 1969 (or some odd 1969 date like that! Don't remember it exactly off the top of my head....).
Work-around: default the date/time field with $TIMESTAMP$ or some other Date/Time...
Hope that helps someone!