{#- Times are shown on the browser's clock, so the browser says which time
    zone it is set to. A cookie keeps it, written again when it changes. -#}
<script>
  try {
    const zone = Intl.DateTimeFormat().resolvedOptions().timeZone;
    const kept = "adminsite_browser_timezone=" + zone;
    if (zone && !document.cookie.split("; ").includes(kept)) {
      document.cookie = kept + "; path=" + {{ urls.index()|tojson }}
        + "; max-age=31536000; samesite=lax";
    }
  } catch (error) {}
</script>