Close website on Christian Sabbath on the client side

website-closed-on-sabbath.js

<script>
  function replacelinks() {
    document.querySelectorAll('a').forEach(el => el.href = "/resources-links/website-closed-for-the-sabbath");
  }
  function close() {
    const closedOnSabbathUrl = "https://gisbornefpchurch.org.nz/resources-links/website-closed-for-the-sabbath";
    const d = new Date();
    // is Sabbath in local time or in NZ
    const isSabbath = d.getDay() === 0 || (d.getUTCDay() === 6 && d.getUTCHours() >= 12) || (d.getUTCDay() === 0 && d.getUTCHours() < 12) 
    if(window.location.href != closedOnSabbathUrl && isSabbath){
      setTimeout(replacelinks, 800);
      window.location.replace(closedOnSabbathUrl);
    }
    if(window.location.href == closedOnSabbathUrl && isSabbath){
      setTimeout(replacelinks, 800);
    }
  }
  close();
  setInterval(close, 500);
</script>

This script does two things:

If it's the Sabbath on the user's local, or the Sabbath in NZ:
1. Redirect to Website Closed for Sabbath page
2. Replace all href links to point to the Website Closed for Sabbath page so the user can't navigate away from the page

I have this script run every 500ms to check.

Put this script in the head tags of a site, and adjust the UTC offset for the location your server is in.