If you are not familiar with the find command, check out our Getting Started article.

To return files that were modified 14 or more days ago.

find / -mtime +14

To include the date and time the file was last modified in the output.

find / -exec stat --format  '%y %n' "{}" \;

To include the date and time the file was last read in the output.

find / -exec stat --format  '%x %n' "{}" \;