time_server.js

/**
 Wite a TCP time server!

 Your server should listen to TCP connections on port 8000. For each
 connection you must write the current date & time in the format:

 YYYY-MM-DD HH:MM

 followed by a newline character. Month, day, hour and minute must be
 zero-filled to 2 integers. For example:

 2013-07-06 07:42

 ----------------------------------------------------------------------
 HINTS:

 The `net` module from Node core has a method named
 `net.createServer()` that takes a callback function. Unlike most
 callbacks in Node, the callback used by `createServer()` is called
 more than once. Every connection received by your server triggers
 another call to the callback. The callback function has the signature:

 function (socket) { ... }

 `net.createServer()` also returns an instance of your `server`. You
 must call `server.listen(portNumber)` to start listening on a
 particular port.

 A typical Node TCP server looks like this:

 var net = require('net')
 var server = net.createServer(function (socket) {
    // socket handling logic
  })
 server.listen(8000)

 The `socket` object contains a lot of meta-data regarding the
 connection, but it is also a Node duplex Stream, in that it can be
 both read from, and written to. For this exercise we only need to
 write data and then close the socket.

 Use `socket.write(data)` to write data to the socket and
 `socket.end()` to close the socket. Alternatively, the `.end()` method
 also takes a data object so you can simplify to just:
 `socket.end(data)`.

 Documentation on the `net` module can be found by pointing your
 browser here:
 /home/anca/lib/node_modules/learnyounode/node_apidoc/net.html

 To create the date, you'll need to create a custom format from a
 `new Date()` object. The methods that will be useful are:

 date.getFullYear()
 date.getMonth()     (starts at 0)
 date.getDate()      (returns the day of month)
 date.getHours()
 date.getMinutes()

 Or, if you want to be adventurous, use the `moment` package from npm.
 Details of this excellent time/date handling library can be found
 here: http://momentjs.com/docs/

 ----------------------------------------------------------------------
 */

var net = require('net');
var moment = require('moment');

var server = net.createServer(function(socket) {
	socket.write(moment().format("YYYY-MM-DD HH:mm") + "\n");

	socket.end();
});

server.listen(8000);