From the Oracle Integration Guide:
Restore until
The options in this drop-down list allow you to limit the selection to those backups that are
suitable for an incomplete recovery to the specified time.
• Now
Use this option to restore the most recent full backup. By default, this option is selected.
• Selected time
Use this option to specify an exact time to which you wish the database to be restored.
Data Protector restores the backup that can be used in recovery to the specified time.