I happened to have a folder containing DOS 6.22 on my desktop and indeed, all the files in the DOS directory are dated 1994-05-31 06:22. Thanks for the interest

I happened to have a folder containing DOS 6.22 on my desktop and indeed, all the files in the DOS directory are dated 1994-05-31 06:22. Thanks for the interesting knowledge, I never noticed that! Maybe it was touch-like command run as a part of the release process.