index.js

// index.js
// where your node app starts

// init project
var express = require('express');
var app = express();

// enable CORS (https://en.wikipedia.org/wiki/Cross-origin_resource_sharing)
// so that your API is remotely testable by FCC
var cors = require('cors');
app.use(cors({optionsSuccessStatus: 200}));  // some legacy browsers choke on 204

// http://expressjs.com/en/starter/static-files.html
app.use(express.static('public'));

// http://expressjs.com/en/starter/basic-routing.html
app.get("/", function (req, res) {
  res.sendFile(__dirname + '/views/index.html');
});


// your first API endpoint...
app.get("/api/hello", function (req, res) {
  res.json({greeting: 'hello API'});
});

app.get('/api/:date', (req, res) => {
  const extractedValue = req.params.date;

  let date = new Date(isNaN(extractedValue) ?extractedValue : parseInt(extractedValue));

  if (date instanceof Date && !isNaN(date.valueOf())) {
    const unixDate = date.getTime();
    const utcDate = date.toUTCString();

    return res.json({ unix:unixDate,  utc:utcDate });
  } else {
    return res.json({ error: date.toString() });
  }
});

app.get('/api', (req, res) => {
  const date = new Date();
  const unixDate = date.getTime();
  const utcDate = date.toString();

  let dateObj = { unix:unixDate,  utc:utcDate };

  res.json(dateObj);
});


// listen for requests :)
var listener = app.listen(process.env.PORT, function () {
  console.log('Your app is listening on port ' + listener.address().port);
});