はてなブログに最終更新日時を追加するためのjs

hatena-blog-last-updated-at.js

window.onload = function () {
  if (location.href.indexOf('entry') > 0) {
    fragments = location.href.split('/');
    year = fragments[4];
    month = parseInt(fragments[5], 10);

    $.get("https://blog.innotamago.com/sitemap_periodical.xml", {year: year, month: month}, function (data) {
      $(data).find("url").each(function (index, dom) {
        if ($(dom).find("loc").text() === location.href) {
          lastUpdatedAt = Date.parse($(dom).find("lastmod").text());
          publishedAt = $('meta[property="article:published_time"]').attr("content");
          if (lastUpdatedAt > publishedAt) {
            datetime = new Date(lastUpdatedAt);
            $('div.entry-date').append(
              '<a class="last-updated-at"><span><span class="date-year">' 
              + datetime.getFullYear() 
              + '</span><span class="hyphen">-</span><span class="date-month">' 
              + ('0' + (datetime.getMonth() + 1)).slice(-2) 
              + '</span><span class="hyphen">-</span><span class="date-day">' 
              + ('0' + datetime.getDate()).slice(-2) + '</span></span></a>'
            );
          }
        }
      });
    });
  }
}