The short form date is intentional by me :) And it's been unchanged for a while now. I personally don't like seeing the year 2017 all the time as I think we'll soon get very used to it.
If you're able to replicate the issue with other emails then let me know, but currently I'm unable to replicate the issue on my side. I'll monitor it to see if others encounter this.
Found the issue it will be fixed in the next version, thanks for the details and help they proved very valuable in finding the issue. It's a rare issue that happens only for emails from a different then today and with a date larger than the current months max date. ie. Jan 30 vs Feb 30 (doesn't exist) The code was updating only the date field and the javascript engine would increment the month since it couldn't find 30 so essentially Feb 30 = Mar 2 and then I would overwrite the Mar to Jan, anyways probably mumbo jumbo but it was a flaw in my coding.
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and which language are you using in Gmail and in the extension?
https://jasonsavard.com/forum/discussion/comment/13103/#Comment_13103
Perhaps a timezone issue or something? How does your code produce the short date?