timeserver.js

var net = require('net');

    var date = new Date();

    var y = date.getFullYear();
    var m = zeroCheck(date.getMonth() + 1);
    var d = zeroCheck(date.getDate());
    var h = zeroCheck(date.getHours());
    var min = zeroCheck(date.getMinutes());

    var all = y + '-' + m + '-' + d + " " + h + ":" + min;
   

    function zeroCheck(arg) {
        arg = arg.toString();
        return arg.length < 2 ? "0" + arg : arg;
    }
var server = net.createServer(function(res) {
   
    res.write(all);
    res.end("\n")
});

server.listen(process.argv[2])