find file modificated 3 day ago:
find2perl -mtime 3 > a.pl
find file modificated from 3 day ago:
find2perl -mtime -3 > b.pl
... and after change the resulting script

See: man (find|find2perl)

In reply to The simpler way by Luca Benini
in thread using grep on a directory to list files for a single date by markkneen

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