javascript:(function() {

 /* OPTIONAL - alert with instructions. */
 var alertInstructionsYoutTubeShortRelease = 1;

 /* Declare global variables. */
 var checkPageInitYoutTubeShortRelease, youTubeShortReleaseURINotice,
     factoidsYoutTubeShortRelease, releaseDateYoutTubeShortRelease,
     actionsIDYoutTubeShortRelease, putReleaseYoutTubeShortRelease,
     youTubeShortPath, youTubeShortURI, reloadYouTubeShortRelease;

 /* Define ready global variables. */
 youTubeShortPath = "https://www.youtube.com/shorts";
 youTubeShortURI  = location.href;
 youTubeShortReleaseURINotice = /* not on shorts page */
 `
  You must be watching "Shorts" for bookmarklet to start.
 `;

 /* HOT-GLUE variable values used for globals defined in support functions. */
 var hotGlueDescrClassYouTubeShortRelease = /* CLASS parent of description  */
  "ytwFactoidRendererFactoid";
 var hotGlueplaceDateYouTubeShortRelease = () => {
  /* DEPRECATED:
  actionsIDYoutTubeShortRelease = 
   document.getElementById("actions");
  */
  return document.getElementsByTagName("reel-action-bar-view-model");
 };

 /***********************SUPPORT FUNCTIONS***********************/
 /*
  Check if being run for first time, setting storage if not as to
  compensate for initialization bug.
 */
 const runInitYoutTubeShortRelease = () => {
  if (reloadYouTubeShortRelease == undefined) { /* don't repeat alerts */
    if (sessionStorage.getItem("initYoutTubeShortRelease") != true) {
      if (location.href.indexOf(youTubeShortPath) > -1) {
        alert(
        "BOOKMARKLET HAS NOT BEEN INITIALIZED:\n\n" +
        "Run bookmarklet again if release date is not displayed.\n"
        );
        /* on shorts set storage */
        sessionStorage.setItem("initYoutTubeShortRelease", "1");
        /* only reload if on shorts page */
        window.location.reload();
      } else {
        alert(youTubeShortReleaseURINotice);
      }
      return 1;
    } else {
      checkPageInitYoutTubeShortRelease = /* define */
        sessionStorage.getItem("initYoutTubeShortRelease");
      return 0;
    }
  }
 };

 /* End if bookmarklet has not been initialised.  */
 reloadYouTubeShortRelease = runInitYoutTubeShortRelease();

  runInitYoutTubeShortRelease();
 /* Define DOM global variables.         *****/
 const defineVarYoutTubeShortRelease = () => {
  /* select parent containing short description */
  factoidsYoutTubeShortRelease =
   document.getElementsByClassName(hotGlueDescrClassYouTubeShortRelease);

  /* placing before this item*/
  actionsIDYoutTubeShortRelease =
   hotGlueplaceDateYouTubeShortRelease();

  /* get release date */
  releaseDateYoutTubeShortRelease =
   factoidsYoutTubeShortRelease[2].textContent;
 };

 /* Create and style HTML to hold date. *****/
 const makeDateElementYoutTubeShortRelease = () => {
  /* create element to store release date */
  putReleaseYoutTubeShortRelease =
   document.createElement("p");

  /* make presentable */
  putReleaseYoutTubeShortRelease
  .style.fontFamily = "Roboto";
  putReleaseYoutTubeShortRelease
  .style.fontWeight = "bold";
  putReleaseYoutTubeShortRelease
  .style.marginLeft = "10px";
  putReleaseYoutTubeShortRelease
  .style.marginBottom = "10px";
  putReleaseYoutTubeShortRelease
  .style.textAlign = "center";
  putReleaseYoutTubeShortRelease
  .style.background = "rgba(0, 0, 0, .095)";
  putReleaseYoutTubeShortRelease
  .style.borderRadius = "25px";
  putReleaseYoutTubeShortRelease
  .style.width = "50px";
  putReleaseYoutTubeShortRelease
  .style.height = "50px";
  putReleaseYoutTubeShortRelease
  .style.paddingTop = "12px";
  putReleaseYoutTubeShortRelease
  .style.boxSizing = "border-box";
  putReleaseYoutTubeShortRelease
  .style.fontSize = "9pt";
  putReleaseYoutTubeShortRelease
  .style.position = "absolute";
  putReleaseYoutTubeShortRelease
  .style.top = "0px";

  /* Give id to remove if duplicates */
  putReleaseYoutTubeShortRelease
  .id = "putReleaseYoutTubeShortRelease";
 };

 /* Add item to right of short. *************/
 const addRelDateYoutTubeShortRelease = () => {
  actionsIDYoutTubeShortRelease[0]
  .insertAdjacentElement("beforebegin", putReleaseYoutTubeShortRelease);

  /* Select again */
  putReleaseYoutTubeShortRelease =
   document.getElementById("putReleaseYoutTubeShortRelease");

  /* check if year is at end or beginning */
  let atEndYear = /^[a-zA-Z]+ \d{5,}$/;
  let atStartYear = /^\d{4}.*$/;

  /* make easier to read */
  if (atEndYear.test(releaseDateYoutTubeShortRelease)) {
   releaseDateYoutTubeShortRelease = /* year is at end */
    releaseDateYoutTubeShortRelease.replace(/([0-9]{1,})([0-9]{4})$/g, "$1, $2");
  } else if (atStartYear.test(releaseDateYoutTubeShortRelease)) {
   releaseDateYoutTubeShortRelease = /* year is at start */
    releaseDateYoutTubeShortRelease.replace(/([0-9]{4})/g, "$1, ");
  }

  /* Put in text of short release date. */
  putReleaseYoutTubeShortRelease.innerText =
   releaseDateYoutTubeShortRelease;
 };

 /* Check if url for short changes. *************/
 const checkCurrentShort = () => {
  /* check url */
  if (location.href.indexOf(youTubeShortPath) == -1) {
   /* remove listeners */
   document.body.removeEventListener("click", showShortReleaseDate);
   /* end bookmarklet */
   return;
  } else {
   /* get short release date */
   let curShort = location.href; /* recheck uri */
   if (curShort == youTubeShortURI) {
    /* do nothing */
    let skip;
   } else {
    /* change short release date */
    showShortReleaseDate();
    youTubeShortURI = location.href; /* redefine for next check */
   }
  }
 };

 /***************************************************************
                          MAIN FUNCTION
 ****************************************************************/
 function showShortReleaseDate() {
  /* Have to delay a bit - using one second cause - seems right. */
  setTimeout(function() {
   /* Check id that is made to remove if already placed. */
   putReleaseYoutTubeShortRelease =
    document.getElementById("putReleaseYoutTubeShortRelease");

   /* If already placed remove. */
   if (putReleaseYoutTubeShortRelease) {
    putReleaseYoutTubeShortRelease.remove();
    defineVarYoutTubeShortRelease();
   } else {
    defineVarYoutTubeShortRelease();
   }

   /* Prep element to be inserted. */
   makeDateElementYoutTubeShortRelease();

   /* insert short release date */
   addRelDateYoutTubeShortRelease();

   /* Delay for half a second for content loading. */
  }, 500);
 }

 /* Adds interval to check for uri change. */
 var runShortReleaseURIInterval;

 /* Check if page needs to be reloaded or if intialised.          */
 if (reloadYouTubeShortRelease == 0) { /* does not need reloading */
  /* add functionality */
  /* Show instructions if turned on and on short path. */
  if (alertInstructionsYoutTubeShortRelease == 1) {
    if (location.href.indexOf(youTubeShortPath) == -1) {
    alert(youTubeShortReleaseURINotice);
    } else {
    alert(`
    INSTRUCTIONS - YOUTUBE SHOW SHORT RELEASE DATE \n
    ********************************************** \n
    After first short has loaded, remaining shorts \n
    will be automatically updated with release date. \n
    `);
    showShortReleaseDate();
    runShortReleaseURIInterval = /* interval to update when short changes */
     setInterval(checkCurrentShort, 500);
  }
  }
 }
})();