}; $(theme.init); const second = 1000, minute = second * 60, hour = minute * 60, day = hour * 24; let countDown = new Date('Jun 19, 2019 00:00:00').getTime(), x = setInterval(function() { let 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); //do something later when date is reached //if (distance < 0) { // clearInterval(x); // 'IT'S MY BIRTHDAY!; //} }, second)