Inserts a date at the cursor location in Google Docs

InsertDate.gs

/**
 * @OnlyCurrentDoc  Limits the script to only accessing the current document.
 */

var now_date = new Date();

// Menu Titles
var title = [
    Utilities.formatDate(now_date, "GMT", "MM/dd/yyyy"),
    Utilities.formatDate(now_date, "GMT", "yyyy-MM-dd"),
    Utilities.formatDate(now_date, "GMT", "EEE, MMMM d, yyyy"),
    Utilities.formatDate(now_date, "GMT", "MMM d, yy")
];


/**
 * Runs when the add-on is installed; calls onOpen() to ensure menu creation and
 * any other initializion work is done immediately.
 *
 * @param {Object} e The event parameter for a simple onInstall trigger.
 */
function onInstall(e) {
  onOpen(e);
}

function onOpen() {
  
  var ui = DocumentApp.getUi();
  ui.createMenu('Utilities')
      .addSubMenu(ui.createMenu('Insert Date...')
        .addItem(title[0], 'menuItem1')
        .addItem(title[1], 'menuItem2')
        .addItem(title[2], 'menuItem3')
        .addItem(title[3], 'menuItem4'))
        .addToUi();
}
                  

function menuItem1() {
        insertAtCursor(title[0]);
}
  
function menuItem2() {
        insertAtCursor(title[1]);
}
  
function menuItem3() {
        insertAtCursor(title[2]);
}
  
function menuItem4() {
        insertAtCursor(title[3]);
}
                  
/**
 * Inserts the date at the current cursor location in boldface.
 */
function insertAtCursor(date) {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    var element = cursor.insertText(date);
    if (!element) {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
}