Date is offset by +1 in the browser

In case someone else finds this bug/thread, I got an answer from support - it's being fixed:

Our Development team have already written a fix for this issue, which is currently being tested in the Beta build of 1Password. If you're interested in giving the Beta a try to test whether you'll notice an improvement, you can learn how to opt-in the beta with the following article:
- Use 1Password beta releases

If you prefer to remain with the stable Production release of 1Password, while I don't have a timeline to share as to when this fix will make its way there, keeping 1Password up to date will ensure that you can receive any fixes and improvements as soon as they're available.