Check the date when a URL was first crawled by Google
(and probably published)

  1. In a new Google Chrome window, go to BookmarksBookmark This Page... and click the More... button.
  2. Change the Name value to Get Publish Date
  3. Change the URL value to javascript:window.location.href=''+window.location.href;
  4. Add it to the Bookmarks Bar folder
  5. All done! You can now click the Get Publish Date bookmark on any page and get directed to a Google search result showing the date when Google first discovered the page (and probably when it was first published).