Version 1.5 of Aperito adds the "onlybefore" and "onlyafter" commands which take either a Unix timestamp or a relative interval like 1d (1 day), 5h (5 hours) or 32m (32 minutes) and scan the files that were modified before or after that timestamp. They can be, of course, combined to scan specific time ranges. I needed this to use scancopynew to backup new files from my user directory without re-hashing all my files every time.