10_time_server.js

/*
10 - Write a TCP time server!
Your server should listen to TCP connections on the port provided by the first argument to your program. For each connection you must write the current date & 24 hour 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 17:42"
 */

var net = require('net');

function zeroFill(i) {
  return (i < 10 ? '0' : '') + i;
}

function now () {
  var d = new Date();
  return d.getFullYear() + '-'
    + zeroFill(d.getMonth() + 1) + '-'
    + zeroFill(d.getDate()) + ' '
    + zeroFill(d.getHours()) + ':'
    + zeroFill(d.getMinutes());
}

var server = net.createServer(function (socket) {
  socket.end(now() + '\n');
});

server.listen(Number(process.argv[2]));