XKCD, but with publish dates appended to the title

xkcd-publish-dates.user.js

// ==UserScript==
// @name    XKCD with publish dates
// @author  MichD
// @include /^https?://xkcd.com.*$/
// @version 1
// @grant   none
// ==/UserScript==

function pad(text) {
  return (text.length < 2 ? "0" : "") + text;
}

(function() {
  var pathSplit = document.location.pathname.split("/"),
      comicPath = (function() {
        var comicNumber;
        
        // Empty string is request for most recent comic
        if (pathSplit.length < 2 || pathSplit[1] === "") {
          return "";
        }
        
        comicNumber = parseInt(pathSplit[1], 10);
        
        // Null means don't bother; not on a comic page
        if (isNaN(comicNumber)) return null;
        
        return comicNumber.toString() + "/";
      }());
  
  if (comicPath === null) return;  
  
  fetch("https://xkcd.com/" + comicPath + "/info.0.json")
    .then(response => response.json())
    .then(function (data) {
      var date = data.year + "-" + pad(data.month) + "-" + pad(data.day);
      var $title = document.querySelector("#ctitle");

      $title.innerText = data.title + " (" + date + ")";
    });   
}());