timer-progress-bar

timer.js

/**
 * Displays the remaining time before date
 */
  timer = function () {
      // Set the date we're counting down to
      const startDate = new Date(Date.UTC(2020, 9, 5));
      const endDate = new Date(Date.UTC(2021, 0, 15));
      const now = new Date();
      const timeTotal = endDate - startDate;
      const timeLeft = endDate - now;

      // update countdown   
      const days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
      document.getElementById("daysLeft").innerHTML = days;

      // Update progress bar
      const progressBar = document.querySelector(".progress-bar");
      const pctFilled = Math.floor(100 * (1 - timeLeft/timeTotal)) ;
      progressBar.setAttribute("aria-valuenow", pctFilled);
      progressBar.style.width = pctFilled + "%";
  };