soc/iris-web/source/app/static/assets/js/iris/ict-clock.js

/* ICT / UTC dual clock — injected into IRIS navbar */
(function () {
  function pad(n) { return String(n).padStart(2, '0'); }

  function tick() {
    var now = new Date();

    /* UTC */
    var utcH = pad(now.getUTCHours());
    var utcM = pad(now.getUTCMinutes());
    var utcS = pad(now.getUTCSeconds());

    /* ICT = UTC + 7 */
    var ictMs = now.getTime() + 7 * 3600 * 1000;
    var ict   = new Date(ictMs);
    var ictH  = pad(ict.getUTCHours());
    var ictM  = pad(ict.getUTCMinutes());
    var ictS  = pad(ict.getUTCSeconds());

    var el = document.getElementById('navbar-ict-clock');
    if (el) {
      el.innerHTML =
        '<span title="Indochina Time (UTC+7)" style="letter-spacing:.02em">' +
          '<i class="fa-regular fa-clock mr-1"></i>' +
          ictH + ':' + ictM + ':' + ictS + ' <span style="opacity:.7">ICT</span>' +
        '</span>' +
        '<span style="opacity:.45;margin:0 6px">|</span>' +
        '<span title="Coordinated Universal Time" style="letter-spacing:.02em">' +
          utcH + ':' + utcM + ':' + utcS + ' <span style="opacity:.7">UTC</span>' +
        '</span>';
    }
  }

  document.addEventListener('DOMContentLoaded', function () {
    tick();
    setInterval(tick, 1000);
  });
})();