Brian Tillman wrote:

Display your Contacts in a list view, like By Category. Click your
column header and choose "Field Chooser". Click the New button at
the bottom. Enyer "Call-back Date" and select "Date/TIme" from teh
format drop-down. Drag your new field to where you want it on the
column bar. Enter youre dates in the new field. When done, click
the new field and your contacts will be grouped by the call-back date.

Or sheepish grin just use the "Callback" field that is already defined in
the "Frequently-used Fields".
--
Brian Tillman