GetFileName plugin.
Configure it and set "file date" to a custom date column (added in preferences > add your own column).
Re-add your books (note that adding the file to an existing record won't work).
Copy the date from your custom column to Calibre's date column.
Unfortunately, DeDRM interferes with this if a book needs to run through that. You'll have to manually check the datetime on those ones and edit it yourself.
Also, this is assuming you downloaded the books as soon as you got them. If you didn't, you'll have to manually edit it.
That's what I do.
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