Hi @kriscampbell
Welcome to the Canvas Community. I assume this is happening to just one user and not everyone, or else there could a a local/network issue at play. But I have had this happen to me and have witnessed it many times with faculty, and it will sometimes occur for seemingly no reason at all. I was conducting a workshop once, demonstrating what a super-great system Canvas is, when I clicked on a due date calendar and it came up with January 1900! (Which I would love to test now with the new Late Policy in the New Gradebook.) But in all seriousness, sometimes a browser refresh/cache clear may help.
HOWEVER, there IS another, official solution posted here to see if it will help: Clicking a date on Calendar shows wrong date . You may want to see if a language setting is at play here.
If that does not help, my main "solution" has been to wait a bit and it will eventually clear itself. (Oh, and try a different browser!)
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