server.js

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

// init project
const path = require("path");
const express = require("express");
const app = express();
const router = express.Router();

// enable CORS (https://en.wikipedia.org/wiki/Cross-origin_resource_sharing)
// so that your API is remotely testable by FCC
const cors = require("cors");

// http://expressjs.com/en/starter/static-files.html
app.use("/public", express.static(__dirname + "/public"));
app.get("/", function(req, res) {
  res.sendFile(path.join(__dirname, "views", "index.html"));
});

router.get("/timestamp/:date_string?", function(req, res) {
  let response = {
    unix: null,
    utc: ""
  };
  
  const dateStr = req.params.date_string;
  console.log('Date string:', dateStr);

  if (!req.params.date_string) {
    console.log('No date provided')
    const date = new Date();
    response.unix = date.getTime();
    response.utc = date.toUTCString();
  } else {  
    try {
      const date = new Date(isNaN(dateStr) ? dateStr : Number(dateStr));
      response.utc = date.toUTCString();
      response.unix = date.getTime();
      if (isNaN(response.unix)) {
        response.unix = null
      }
      console.log('Date:', response);
    } catch (e) {
      console.error('Failed to parse date string:', e);
      response.unix = null;
      response.utc = "Invalid Date";
    }
  }

  res.json(response);
});

app.use(
  "/api",
  cors({
    optionSuccessStatus: 200
  }),
  router
); // some legacy browsers choke on 204

// Respond to not found routes.
app.use(function(req, res, next) {
  if (req.method.toLowerCase() === "options") {
    res.end();
  } else {
    res
      .status(404)
      .type("txt")
      .send("Not Found");
  }
});

// Error handling
app.use(function(err, req, res, next) {
  if (err) {
    res
      .status(err.status || 500)
      .type("txt")
      .send(err.message || "SERVER ERROR");
  }
});

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