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diff --git a/js/src/tests/non262/Date/shell.js b/js/src/tests/non262/Date/shell.js
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+++ b/js/src/tests/non262/Date/shell.js
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+/**
+ * Date functions used by tests in Date suite
+ */
+(function(global) {
+    const msPerDay = 1000 * 60 * 60 * 24;
+    const msPerHour = 1000 * 60 * 60;
+    global.msPerHour = msPerHour;
+
+    // Offset of tester's time zone from UTC.
+    const TZ_DIFF = GetRawTimezoneOffset();
+    global.TZ_ADJUST = TZ_DIFF * msPerHour;
+
+    const UTC_01_JAN_1900 = -2208988800000;
+    const UTC_01_JAN_2000 = 946684800000;
+    const UTC_29_FEB_2000 = UTC_01_JAN_2000 + 31 * msPerDay + 28 * msPerDay;
+    const UTC_01_JAN_2005 = UTC_01_JAN_2000 + TimeInYear(2000) + TimeInYear(2001) +
+                            TimeInYear(2002) + TimeInYear(2003) + TimeInYear(2004);
+    global.UTC_01_JAN_1900 = UTC_01_JAN_1900;
+    global.UTC_01_JAN_2000 = UTC_01_JAN_2000;
+    global.UTC_29_FEB_2000 = UTC_29_FEB_2000;
+    global.UTC_01_JAN_2005 = UTC_01_JAN_2005;
+
+    /*
+     * Originally, the test suite used a hard-coded value TZ_DIFF = -8.
+     * But that was only valid for testers in the Pacific Standard Time Zone!
+     * We calculate the proper number dynamically for any tester. We just
+     * have to be careful not to use a date subject to Daylight Savings Time...
+     */
+    function GetRawTimezoneOffset() {
+        let t1 = new Date(2000, 1, 1).getTimezoneOffset();
+        let t2 = new Date(2000, 1 + 6, 1).getTimezoneOffset();
+
+        // 1) Time zone without daylight saving time.
+        // 2) Northern hemisphere with daylight saving time.
+        if ((t1 - t2) >= 0)
+            return -t1 / 60;
+
+        // 3) Southern hemisphere with daylight saving time.
+        return -t2 / 60;
+    }
+
+    function DaysInYear(y) {
+        return y % 4 === 0 && (y % 100 !== 0 || y % 400 === 0) ? 366 : 365;
+    }
+
+    function TimeInYear(y) {
+        return DaysInYear(y) * msPerDay;
+    }
+
+    function getDefaultTimeZone() {
+        var tz = getTimeZone();
+        switch (tz) {
+          case "EST":
+          case "EDT":
+            return "EST5EDT";
+
+          case "CST":
+          case "CDT":
+            return "CST6CDT";
+
+          case "MST":
+          case "MDT":
+            return "MST7MDT";
+
+          case "PST":
+          case "PDT":
+            return "PST8PDT";
+
+          default:
+            // Other time zones abbrevations are not supported.
+            return tz;
+        }
+    }
+
+    function getDefaultLocale() {
+        // If the default locale looks like a BCP-47 language tag, return it.
+        var locale = global.getDefaultLocale();
+        if (locale.match(/^[a-z][a-z0-9\-]+$/i))
+            return locale;
+
+        // Otherwise use undefined to reset to the default locale.
+        return undefined;
+    }
+
+    let defaultTimeZone = null;
+    let defaultLocale = null;
+
+    // Run the given test in the requested time zone.
+    function inTimeZone(tzname, fn) {
+        if (defaultTimeZone === null)
+            defaultTimeZone = getDefaultTimeZone();
+
+        setTimeZone(tzname);
+        try {
+            fn();
+        } finally {
+            setTimeZone(defaultTimeZone);
+        }
+    }
+    global.inTimeZone = inTimeZone;
+
+    // Run the given test with the requested locale.
+    function withLocale(locale, fn) {
+        if (defaultLocale === null)
+            defaultLocale = getDefaultLocale();
+
+        setDefaultLocale(locale);
+        try {
+            fn();
+        } finally {
+            setDefaultLocale(defaultLocale);
+        }
+    }
+    global.withLocale = withLocale;
+
+    const Month = {
+        January: 0,
+        February: 1,
+        March: 2,
+        April: 3,
+        May: 4,
+        June: 5,
+        July: 6,
+        August: 7,
+        September: 8,
+        October: 9,
+        November: 10,
+        December: 11,
+    };
+    global.Month = Month;
+
+    const weekdays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"].join("|");
+    const months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"].join("|");
+    const datePart = String.raw `(?:${weekdays}) (?:${months}) \d{2}`;
+    const timePart = String.raw `\d{4,6} \d{2}:\d{2}:\d{2} GMT[+-]\d{4}`;
+    const dateTimeRE = new RegExp(String.raw `^(${datePart} ${timePart})(?: \((.+)\))?$`);
+
+    function assertDateTime(date, expected, ...alternativeTimeZones) {
+        let actual = date.toString();
+        assertEq(dateTimeRE.test(expected), true, `${expected}`);
+        assertEq(dateTimeRE.test(actual), true, `${actual}`);
+
+        let [, expectedDateTime, expectedTimeZone] = dateTimeRE.exec(expected);
+        let [, actualDateTime, actualTimeZone] = dateTimeRE.exec(actual);
+
+        assertEq(actualDateTime, expectedDateTime);
+
+        // The time zone identifier is optional, so only compare its value if
+        // it's present in |actual| and |expected|.
+        if (expectedTimeZone !== undefined && actualTimeZone !== undefined) {
+            // Test against the alternative time zone identifiers if necessary.
+            if (actualTimeZone !== expectedTimeZone) {
+                for (let alternativeTimeZone of alternativeTimeZones) {
+                    if (actualTimeZone === alternativeTimeZone) {
+                        expectedTimeZone = alternativeTimeZone;
+                        break;
+                    }
+                }
+            }
+            assertEq(actualTimeZone, expectedTimeZone);
+        }
+    }
+    global.assertDateTime = assertDateTime;
+})(this);
+
+
+function runDSTOffsetCachingTestsFraction(part, parts)
+{
+  var BUGNUMBER = 563938;
+  var summary = 'Cache DST offsets to improve SunSpider score';
+
+  print(BUGNUMBER + ": " + summary);
+
+  var MAX_UNIX_TIMET = 2145859200; // "2037-12-31T08:00:00.000Z" (PST8PDT based!)
+  var RANGE_EXPANSION_AMOUNT = 30 * 24 * 60 * 60;
+
+  /**
+   * Computes the time zone offset in minutes at the given timestamp.
+   */
+  function tzOffsetFromUnixTimestamp(timestamp)
+  {
+    var d = new Date(NaN);
+    d.setTime(timestamp); // local slot = NaN, UTC slot = timestamp
+    return d.getTimezoneOffset(); // get UTC, calculate local => diff in minutes
+  }
+
+  /**
+   * Clear the DST offset cache, leaving it initialized to include a timestamp
+   * completely unlike the provided one (i.e. one very, very far away in time
+   * from it).  Thus an immediately following lookup for the provided timestamp
+   * will cache-miss and compute a clean value.
+   */
+  function clearDSTOffsetCache(undesiredTimestamp)
+  {
+    var opposite = (undesiredTimestamp + MAX_UNIX_TIMET / 2) % MAX_UNIX_TIMET;
+
+    // Generic purge to known, but not necessarily desired, state
+    tzOffsetFromUnixTimestamp(0);
+    tzOffsetFromUnixTimestamp(MAX_UNIX_TIMET);
+
+    // Purge to desired state.  Cycle 2x in case opposite or undesiredTimestamp
+    // is close to 0 or MAX_UNIX_TIMET.
+    tzOffsetFromUnixTimestamp(opposite);
+    tzOffsetFromUnixTimestamp(undesiredTimestamp);
+    tzOffsetFromUnixTimestamp(opposite);
+    tzOffsetFromUnixTimestamp(undesiredTimestamp);
+  }
+
+  function computeCanonicalTZOffset(timestamp)
+  {
+    clearDSTOffsetCache(timestamp);
+    return tzOffsetFromUnixTimestamp(timestamp);
+  }
+
+  var TEST_TIMESTAMPS_SECONDS =
+    [
+     // Special-ish timestamps
+     0,
+     RANGE_EXPANSION_AMOUNT,
+     MAX_UNIX_TIMET,
+    ];
+
+  var ONE_DAY = 24 * 60 * 60;
+  var EIGHTY_THREE_HOURS = 83 * 60 * 60;
+  var NINETY_EIGHT_HOURS = 98 * 60 * 60;
+  function nextIncrement(i)
+  {
+    return i === EIGHTY_THREE_HOURS ? NINETY_EIGHT_HOURS : EIGHTY_THREE_HOURS;
+  }
+
+  // Now add a long sequence of non-special timestamps, from a fixed range, that
+  // overlaps a DST change by "a bit" on each side.  67 days should be enough
+  // displacement that we can occasionally exercise the implementation's
+  // thirty-day expansion and the DST-offset-change logic.  Use two different
+  // increments just to be safe and catch something a single increment might not.
+  var DST_CHANGE_DATE = 1268553600; // March 14, 2010
+  for (var t = DST_CHANGE_DATE - 67 * ONE_DAY,
+           i = nextIncrement(NINETY_EIGHT_HOURS),
+           end = DST_CHANGE_DATE + 67 * ONE_DAY;
+       t < end;
+       i = nextIncrement(i), t += i)
+  {
+    TEST_TIMESTAMPS_SECONDS.push(t);
+  }
+
+  var TEST_TIMESTAMPS =
+    TEST_TIMESTAMPS_SECONDS.map(function(v) { return v * 1000; });
+
+  /**************
+   * BEGIN TEST *
+   **************/
+
+  // Compute the correct time zone offsets for all timestamps to be tested.
+  var CORRECT_TZOFFSETS = TEST_TIMESTAMPS.map(computeCanonicalTZOffset);
+
+  // Intentionally and knowingly invoking every single logic path in the cache
+  // isn't easy for a human to get right (and know he's gotten it right), so
+  // let's do it the easy way: exhaustively try all possible four-date sequences
+  // selecting from our array of possible timestamps.
+
+  var sz = TEST_TIMESTAMPS.length;
+  var start = Math.floor((part - 1) / parts * sz);
+  var end = Math.floor(part / parts * sz);
+
+  print("Exhaustively testing timestamps " +
+        "[" + start + ", " + end + ") of " + sz + "...");
+
+  try
+  {
+    for (var i = start; i < end; i++)
+    {
+      print("Testing timestamp " + i + "...");
+
+      var t1 = TEST_TIMESTAMPS[i];
+      for (var j = 0; j < sz; j++)
+      {
+        var t2 = TEST_TIMESTAMPS[j];
+        for (var k = 0; k < sz; k++)
+        {
+          var t3 = TEST_TIMESTAMPS[k];
+          for (var w = 0; w < sz; w++)
+          {
+            var t4 = TEST_TIMESTAMPS[w];
+
+            clearDSTOffsetCache(t1);
+
+            var tzo1 = tzOffsetFromUnixTimestamp(t1);
+            var tzo2 = tzOffsetFromUnixTimestamp(t2);
+            var tzo3 = tzOffsetFromUnixTimestamp(t3);
+            var tzo4 = tzOffsetFromUnixTimestamp(t4);
+
+            assertEq(tzo1, CORRECT_TZOFFSETS[i]);
+            assertEq(tzo2, CORRECT_TZOFFSETS[j]);
+            assertEq(tzo3, CORRECT_TZOFFSETS[k]);
+            assertEq(tzo4, CORRECT_TZOFFSETS[w]);
+          }
+        }
+      }
+    }
+  }
+  catch (e)
+  {
+    assertEq(true, false,
+             "Error when testing with timestamps " +
+             i + ", " + j + ", " + k + ", " + w +
+             " (" + t1 + ", " + t2 + ", " + t3 + ", " + t4 + ")!");
+  }
+
+  reportCompare(true, true);
+  print("All tests passed!");
+}