In the Reports section go to Client Backups.
Leave Client selected to '<All Clients>'
For the Date/Time range, check 'Earliest Available'
For the Windows Admin Console:
In the bottom half of the screen, configure it to display the 'Expiration Date' and 'Expiration Time' columns.
Run the report.
Use the filter tool to select the Expiration Date you want.
I usually do something like this but on a media basis (ie: I want to see what tapes are expiring between date X and Y); that is under the Media Lists report, in case you want to do that too. Same basic procedure.
