(function () {
    const second = 1000,
          minute = second * 60,
          hour = minute * 60,
          day = hour * 24;
  
    const countDown = new Date(targetDate).getTime();
  
    const x = setInterval(function () {
      const now = new Date().getTime(),
            distance = countDown - now;
  
      document.getElementById("days").innerText = Math.floor(distance / day);
      document.getElementById("hours").innerText = Math.floor((distance % day) / hour);
      document.getElementById("minutes").innerText = Math.floor((distance % hour) / minute);
      document.getElementById("seconds").innerText = Math.floor((distance % minute) / second);
  
      if (distance < 0) {
        document.getElementById("countdown").style.display = "none";
        document.getElementById("content").style.display = "block";
        clearInterval(x);
      }
    }, 1000);
  })();