server.js

// server.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'});
});



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

app.get('/api/timestamp',(req,res)=>{
  let currDate = new Date();
  res.json({unix:0+currDate.getTime(),utc:currDate.toUTCString()});
})

app.get("/api/timestamp/:date",(req,res)=>{
  let date = req.params.date;
  if(!isNaN(date))
  {
    let datenum = new Date(parseInt(date));
    if(datenum.toString() == "Invalid Date")
      res.json({error:"Invalid Date"});
    else
      res.json({unix:parseInt(date),utc:datenum.toUTCString()});
  }
  else
  {
    let datenum = new Date(date);
    console.log()
    if(datenum.toString() == "Invalid Date")
      res.json({error:"Invalid Date"});
    else
      res.json({unix:(datenum.getTime()*10)/10,utc:datenum.toUTCString()});
  }
})