Function getOldestDate

scripts/web_timer_main.js:51–60

()

});

function getOldestDate() {
  try {
    let dateKeys = Object.keys(web_timer);
    dateKeys.sort();
    return dateKeys[0];
  } catch (e) {
    console.log(e);
    return null;
  }
}

function init() {
  backBtn.addEventListener("click", () => {