Hilariously, some of the first Google results give SEO articles with completely wrong advice.

E.g. this article from SEO digital agency: https://sonet.digital/blog/general/keep-copyright-up-to-date... The commenters below the article were quick to point out the mistake.

And this article from "Squarespace educator" gives JavaScript code to automatically display the current year: https://kerstinmartin.com/blog/copyright-notice