var timestamp = 1588952073;

timestamp /= 1000; // from ms to seconds

function component(x, v) {
return Math.floor(x / v);
}

var $div = $('div');

setInterval(function() {

timestamp--;

var days = component(timestamp, 24 * 60 * 60),
hours = component(timestamp, 60 * 60) % 24,
minutes = component(timestamp, 60) % 60,
seconds = component(timestamp, 1) % 60;

$div.html(days + " days, " + hours + ":" + minutes + ":" + seconds);

}, 1000);