How Do I Find Emails Saved As .eml Files By Date?

I’m trying to save several years of old emails by dragging and dropping to a new folder on my desktop. They are saved as.eml. They all transfer and can be easily opened and viewed, but once in the new folder they are no longer organized by date. When I dragged them they were directly from Mail and organized by date. The only dates given in the new folder are the “date created” and “date modified”, all of which are today’s date. Even if I click on “date created” or “date modified” they still are not in chronological order. So it’s very difficult to locate an email, say, from November 2012. Any suggestions on making the new.eml folder more useful in locating a particular email?
Device: Mac Running Big Sur
App: Mac Mail
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Dan