Without libraries
Number.prototype.toDate = function () {
var seconds = Math.floor(this), hours = Math.floor(seconds / 3600);
seconds -= hours * 3600;
var minutes = Math.floor(seconds / 60);
seconds -= minutes * 60;
if (hours < 10) {hours = "0" + hours;}
if (minutes < 10) {minutes = "0" + minutes;}
if (seconds < 10) {seconds = "0" + seconds;}
var date = new Date();
date.setHours(hours);
date.setMinutes(minutes);
date.setSeconds(seconds);
return date;
}
220.toDate()
Use moment.js
moment().startOf('day').seconds(220).toDate()