You can add the Created field to a list view pretty easily by dragging it
from the Field Chooser (right click on the list header and choose Field
Chooser to display it)
In the Calendar folder go to the View menu > Arrange By > Current View >
Active Appointments (or other view that uses a list format - you'll see what
I mean once you select the view). Right click on the field name header and
choose "Field Chooser", choose the "Frequently-used fields" in the
drop-down, then drag/drop the Created field name to the field header to add
the field to the view