app.js

var app = require('http').createServer(response);
var fs = require('fs');
var io = require('socket.io')(app);

app.listen(3000);
console.log("App running...");

function response(req, res) {
    var file = "";
    if(req.url == "/"){
	   file = __dirname + '/index.html';
    } else {
	   file = __dirname + req.url;
    }
   
    fs.readFile(file,
	    function (err, data) {
			if (err) {
				res.writeHead(404);
				return res.end('Page or file not found');
			}

			res.writeHead(200);
			res.end(data);
	    }
    );
}

io.on("connection", function(socket){
    socket.on("send message", function(sent_msg, callback){
		sent_msg = "[ " + getCurrentDate() + " ]: " + sent_msg;

		io.sockets.emit("update messages", sent_msg);
		callback();
    });
});

function getCurrentDate(){
	var currentDate = new Date();
	var day = (currentDate.getDate()<10 ? '0' : '') + currentDate.getDate();
	var month = ((currentDate.getMonth() + 1)<10 ? '0' : '') + (currentDate.getMonth() + 1);
	var year = currentDate.getFullYear();
	var hour = (currentDate.getHours()<10 ? '0' : '') + currentDate.getHours();
	var minute = (currentDate.getMinutes()<10 ? '0' : '') + currentDate.getMinutes();
	var second = (currentDate.getSeconds()<10 ? '0' : '') + currentDate.getSeconds();

	return year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
}