text: document.addEventListener("DOMContentLoaded", () => {
      let timezoneSelect = document.getElementById("timezone");
      let timezone = timezoneSelect.value;
      let submit = document.getElementById("submit");
      submit.disabled = true;
      timezoneSelect.addEventListener("change", () => {
          submit.disabled = (timezoneSelect.value === timezone) ? true : false;
      });
  });
  