We had a computer dedicated to encoding video that had a misconfigured date that was in the future so all of the encodes from it had the incorrect date. It played havoc with another program on a different system with the correct date. It took a few days for that program's support team to recognize the issue. There was nothing wrong with the file as in the video/audio data was not corrupt or anything. Doing a stream copy to a new file with a sane date made the program happy again.

Never did understand why the software even looked at dates, and support couldn't explain it either.