my-website/static/scripts/updatecopyrightyear.js

"use strict";

{
  const copyrightYearElement = document.getElementById("footer-copyrightyear");

  if (copyrightYearElement) {
    const currentYearAsStr = new Date().getFullYear().toString();

    copyrightYearElement.innerText = currentYearAsStr;
    copyrightYearElement.dateTime = currentYearAsStr;
  } else
    console.error(
      "Could not find the footer entry for the year of the copyright notice."
    );
}