timestamp.js

#! /usr/bin/env nodejs

'use strict';

const path = require('path');
const url = require('url');
const http = require('http');
const fs = require('fs');

if (process.argv.length !== 3) {
  process.stderr.write(`usage: ${path.basename(process.argv[1])} port\n`);
  process.exit(1);
}

const sendResponse = (r, data) => {
  r.writeHead(200, { 'content-type': 'application/json' });
  r.write(JSON.stringify(data));
  r.end();
};

const server = http.createServer((req, res) => {
  // parse the url
  const URL = url.parse(req.url, true);
  if (URL.pathname === '/') {
    res.writeHead(200, { 'content-type': 'text/html' });
    fs.createReadStream('./index.html').pipe(res);
  } else {
    console.log(URL);
    let api = URL.pathname.replace(/^\//, '');
    api = decodeURI(api);

    // get the time stamp
    let timestamp;
    if (/^\d+$/.test(api)) {
      // unix time -> seconds but javascript Date-> milliseconds
      timestamp = parseInt(api, 10) * 1000;
    } else {
      timestamp = Date.parse(api);
    }

    const payload = {};

    // check if valid time
    if (Number.isNaN(timestamp)) {
      payload.unix = null;
      payload.natural = null;
    } else {
      // build pay load
      const date = new Date(timestamp);
      payload.unix = date.getTime() / 1000;
      payload.natural = date.toLocaleString('en', {
        month: 'long',
        day: '2-digit',
        year: 'numeric',
      });
    }

    sendResponse(res, payload);
  }
});

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