itctimezone.user.js

// ==UserScript==
// @name iTC time zone
// @namespace http://iphone-dev.g.hatena.ne.jp/ktakayama/
// @description iTC time zone
// @include https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/wo/*
// ==/UserScript==
 
(function() {
      var path = "//div[@class='versionStateHistory-col-0']/p";
      var nodes = document.evaluate(
         path, document, null,
         XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null
      );

      var hour = 60 * 60 * 1000; // 1hour

      var local = - new Date().getTimezoneOffset() / 60;
      var difference = hour * (8 + local);

      for(var i = 1, elm; elm = nodes.snapshotItem(i); i++) {
         var date = new Date(Date.parse(elm.innerHTML));
         var d = difference;
         if(checkSummerTime(date)) d -= hour;
         elm.innerHTML = (new Date(date.getTime() + d)).toString();
         i++;
      }
})();

function checkSummerTime(date) {
   var year = date.getFullYear();
   var time = date.getTime();
   return (stStart(year).getTime() < time && stEnd(year).getTime() > time);
}

// 3月の第2日曜日2時
function stStart(year) {
   var date = new Date(year, 2, 1, 2, 0, 0);
   for(var i = 8; i <= 14; i++) {
      date.setDate(i);
      if(0 == date.getDay()) break;
   }
   return date;
}

// 11月の第1日曜日2時
function stEnd(year) {
   var date = new Date(year, 10, 1, 2, 0, 0);
   for(var i = 1; i <= 7; i++) {
      date.setDate(i);
      if (0 == date.getDay()) break;
   }
   return date;
}