// Set the date we’re counting down to var countDownDate = new Date(“Feb 5, 2019 00:00:00″).getTime(); // Update the count down every 1 second var x = setInterval(function() { // Get todays date and time var now = new Date().getTime(); // Find the distance between now an the count down date var distance = countDownDate – now; // Time calculations for days, hours, minutes and seconds var days = Math.floor(distance / (1000 * 60 * 60 * 24)); var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)); var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60)); var seconds = Math.floor((distance % (1000 * 60)) / 1000); // Display the result in the element with id=”demo” document.getElementById(“demo”).innerHTML = days + ” ngày: ” + hours + ” giờ: ” + minutes + ” phút: ” + seconds + ” giây “; // If the count down is finished, write some text if (distance < 0) { clearInterval(x); document.getElementById("demo").innerHTML = "Chúc mừng năm mới!"; } }, 1000);