I can see the date/time that a waypoint was created when I look at it on my 550T, but that does not show up anywhere in BaseCamp after I import the waypoint.
The date/time used to show in the comments field when I imported waypoints to Mapsource from my etrex vista cx. And the waypoints I moved from Mapsource to BaseCamp still show that information.
Can you enable BaseCamp to import/display the waypoint creation date/time?