There should be a 3rd date value in a unix/linux partition, just like ntfs has the option for but you can disable it in ntfs.

It is called Date Accessed. Huge time saver for something like what you want to do.

Search for . in the Runtime then sort it by date last accessed, choose a cutoff date, then move the newer stuff to a new runtime. Remove the old runtime from the Poser library. That way you will know when you need to move something else that was missed in a date sort.

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