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?", function(req, res) {

  let requestedDate = req.params.date;
  console.log('requestedDate', requestedDate);

  if (requestedDate) {
    let parsedReqDate = new Date(requestedDate);
    let numberedTimeStamp = Number(requestedDate);
    console.log('parsedReqDate >>>> ', parsedReqDate, 'numberedTimeStamp >>>>', numberedTimeStamp);

    if (parsedReqDate.toString() !== 'Invalid Date') {
      console.log('valid date');
      res.json({ unix: parsedReqDate.getTime(), utc: new Date(parsedReqDate).toUTCString() });
    } else if (!isNaN(numberedTimeStamp)) {
      console.log('valid number');
      res.json({ unix: numberedTimeStamp, utc: new Date(numberedTimeStamp).toUTCString() });
    } else {
      console.log('invalid');
      res.json({ error: 'Invalid Date' });
    }
  } else {
    res.json({ unix: Date.now(), utc: new Date().toUTCString() });
  }
  
});



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