I need to store and update a timestamp in local storage so after one minute the modal will execute each time. I want the modal to appear on refresh only if the time stamp has expired or gone past one minute. One minute duration is just for testing purposes. Goal is to only show a modal once a day to user. Here is what I have so far. It only shows modal on refresh and stores local storage key. But after one minute the modal does not appear on refresh and should.

    $(document).ready(function() {
          function shouldShowModal() {
              const lastTimestamp = localStorage.getItem("modalTimestamp");
              if (!lastTimestamp) {
                  return true;
              }
              const parsedTimestamp = parseInt(lastTimestamp, 10);
              let expiryLimit = new Date(parsedTimestamp);
              expiryLimit = expiryLimit.setMinutes(expiryLimit.getMinutes() + 1);
              return new Date() > expiryLimit;
          }
    
          if (window.localStorage) {
              const currentUser = '<%= current_user %>';
              const currentTime = new Date($.now());
              if (currentUser && shouldShowModal()) {
                  swal ({
                      icon: 'warning',
                      text: 'Notice text here.',
                      closeOnClickOutside: false,
                      button: 'ok'
                  })
                  localStorage.setItem('modalTimestamp', currentTime);
              }
          }
    }

Updated working with @Barmar solution:

    $(document).ready(function() {
          function shouldShowModal() {
              const lastTimestamp = localStorage.getItem("modalTimestamp");
              if (!lastTimestamp) {
                  return true;
              }
              const parsedTimestamp = parseInt(lastTimestamp, 10);
              let expiryLimit = new Date(parsedTimestamp);
              expiryLimit = expiryLimit.setHours(expiryLimit.getHours() + 24);
              return new Date() > expiryLimit;
          }
    
          if (window.localStorage) {
              const currentUser = '<%= current_user %>';
              const currentTime = new Date();
              if (currentUser && shouldShowModal()) {
                  swal ({
                      icon: 'warning',
                      text: 'Notice text here.',
                      closeOnClickOutside: false,
                      button: 'ok'
                  })
                  localStorage.setItem('modalTimestamp', currentTime.getTime());
              }
          }
    }