I have, in the past run Calibre on Windows 10, to import Kindle books, and in that environment the file listing shown in Calibre includes the date/time for the files from which to choose.
I am now running Calibre in Wine on Ubuntu Linux, and importing kindle books works fine*, HOWEVER, Calibre's import file listing does not show the file dates. this makes it hard to find the one(s) I want to import, since Amazon kindly uses gibberish for the file names.
Is this a bug, or a feature?

Any known way around it?
thanks in advance!
Fred
*to import Kindle books into Calibre you need to go read Apprentice Alf's blog and follow the instructions there.
https://apprenticealf.wordpress.com/