LOL I guess you could call it a glitch. I laugh because why would we care what the dates are? You really shouldn't consider it a problem. It's mail you don't want or don't ever open (or shouldn't open). Just ignore it. It's not a problem at all. The dates for spam, right or wrong serve no purpose whatsoever. So unless you're waiting for something in you In-box that you haven't received, don't EVER bother to open that folder, and you won't have to see the crazy dates, and never, never open any of them. Yahoo even empties that folder (and the Trash folder) for us every 3 days or so. So we don't even need to delete the emails in there.