fridayCome.js

var fridayTime = function() {
	var now = new Date(),
		day = now.getDay(),
		date = now.getDate(),
		fridayDate = date + (5 - day),
		friday = new Date(2016, now.getMonth(), fridayDate),
		timeDiff = Math.abs(friday.getTime() - now.getTime()),
		msToTime = function(s) {
		  var ms = s % 1000;
		  s = (s - ms) / 1000;
		  var secs = s % 60;
		  s = (s - secs) / 60;
		  var mins = s % 60;
		  var hrs = (s - mins) / 60;

		  return hrs + ':' + mins + ':' + secs;
		};

	console.log('Friday will come in ' + msToTime(timeDiff) + ' hours :)');
};

setInterval(fridayTime, 1000);