diff --git a/polyfill/lib/calendar.mjs b/polyfill/lib/calendar.mjs
index d50ece6df..25bac61fb 100644
--- a/polyfill/lib/calendar.mjs
+++ b/polyfill/lib/calendar.mjs
@@ -319,6 +319,41 @@ const monthCodeInfo = {
   }
 };
 
+const calendarMinYear = {
+  buddhist: -271278,
+  chinese: -271821,
+  coptic: -272099,
+  dangi: -271821,
+  ethioaa: -266323,
+  ethiopic: -271823,
+  gregory: -271821,
+  hebrew: -268058,
+  indian: -271899,
+  'islamic-civil': -280804,
+  'islamic-tbla': -280804,
+  'islamic-umalqura': -280804,
+  japanese: -271821,
+  persian: -272442,
+  roc: -273732
+};
+const calendarMaxYear = {
+  buddhist: 276303,
+  chinese: 275760,
+  coptic: 275471,
+  dangi: 275760,
+  ethioaa: 281247,
+  ethiopic: 275747,
+  gregory: 275760,
+  hebrew: 279517,
+  indian: 275682,
+  'islamic-civil': 283583,
+  'islamic-tbla': 283583,
+  'islamic-umalqura': 283583,
+  japanese: 275760,
+  persian: 275139,
+  roc: 273849
+};
+
 function IsValidMonthCodeForCalendar(calendar, monthCode) {
   const { monthNumber, isLeapMonth } = ParseMonthCode(monthCode);
   if (!isLeapMonth && monthNumber >= 1 && monthNumber <= 12) return true;
@@ -533,6 +568,7 @@ OneObjectCache.MAX_CACHE_ENTRIES = 1000;
  * Returns a WeakMap-backed cache that's used to store expensive results
  * that are associated with a particular ISO Date Record object instance.
  *
+ * @param id - calendar ID for the cache
  * @param obj - object to associate with the cache
  */
 OneObjectCache.getCacheForObject = function (id, obj) {
@@ -917,6 +953,10 @@ const nonIsoHelperBase = {
     // are all present, converting monthCode and eraYear if needed.
     date = this.adjustCalendarDate(date, cache, overflow, false);
 
+    if (date.year > calendarMaxYear[this.id] || date.year < calendarMinYear[this.id]) {
+      throw new RangeError(`Year ${date.year} out of range for calendar ${this.id}`);
+    }
+
     // Fix obviously out-of-bounds values. Values that are valid generally, but
     // not in this particular year, may not be caught here for some calendars.
     // If so, these will be handled lower below.
@@ -1996,7 +2036,7 @@ const helperChinese = ObjectAssign({}, nonIsoHelperBase, {
     const { month, year } = calendarDate;
 
     const previousMonthYear = month > 1 ? year : year - 1;
-    let previousMonthDate = { year: previousMonthYear, month, day: 1 };
+    const previousMonthDate = { year: previousMonthYear, month, day: 1 };
     const previousMonth = month > 1 ? month - 1 : this.monthsInYear(previousMonthDate, cache);
 
     return this.daysInMonth({ year: previousMonthYear, month: previousMonth }, cache);
diff --git a/polyfill/lib/ecmascript.mjs b/polyfill/lib/ecmascript.mjs
index e5a229c52..6d6a0c3eb 100644
--- a/polyfill/lib/ecmascript.mjs
+++ b/polyfill/lib/ecmascript.mjs
@@ -770,12 +770,15 @@ export function ToTemporalPartialDurationRecord(temporalDurationLike) {
   return result;
 }
 
-export function AdjustDateDurationRecord({ years, months, weeks }, newDays, newWeeks, newMonths) {
+export function AdjustDateDurationRecord(dateDuration, newDays, newWeeks, newMonths) {
   assert(newDays !== undefined, 'days must be provided to AdjustDateDurationRecord');
+  const months = newMonths ?? dateDuration.months;
+  const weeks = newWeeks ?? dateDuration.weeks;
+  RejectDuration(dateDuration.years, months, weeks, newDays, 0, 0, 0, 0, 0, 0);
   return {
-    years,
-    months: newMonths ?? months,
-    weeks: newWeeks ?? weeks,
+    years: dateDuration.years,
+    months,
+    weeks,
     days: newDays
   };
 }
@@ -941,10 +944,9 @@ export function ValidateTemporalUnitValue(value, unitGroup, extraValues = []) {
   if (Call(ArrayPrototypeIncludes, extraValues, [value])) return;
   for (let index = 0; index < TEMPORAL_UNITS.length; index++) {
     const unitInfo = TEMPORAL_UNITS[index];
-    const singular = unitInfo[0];
     const plural = unitInfo[1];
     const category = unitInfo[2];
-    if (value !== singular && value !== plural) continue;
+    if (value !== plural) continue;
     if (unitGroup === 'datetime' || unitGroup === category) return;
   }
   throw new RangeErrorCtor(`${value} not allowed as a ${unitGroup} unit`);
@@ -2820,7 +2822,7 @@ export function RejectDateTime(year, month, day, hour, minute, second, milliseco
 export function RejectDateTimeRange(isoDateTime) {
   const ns = GetUTCEpochNanoseconds(isoDateTime);
   if (ns.lesser(DATETIME_NS_MIN) || ns.greater(DATETIME_NS_MAX)) {
-    const dateTimeString = ISODateTimeToString(isoDateTime, 'auto', 'auto', 'never');
+    const dateTimeString = ISODateTimeToString(isoDateTime, 'iso8601', 'auto', 'never');
     throw new RangeErrorCtor(`${dateTimeString} is outside of supported range`);
   }
 }
@@ -2830,7 +2832,7 @@ function AssertISODateTimeWithinLimits(isoDateTime) {
   const ns = GetUTCEpochNanoseconds(isoDateTime);
   assert(
     ns.geq(DATETIME_NS_MIN) && ns.leq(DATETIME_NS_MAX),
-    `${ISODateTimeToString(isoDateTime, 'auto', 'auto', 'never')} is outside the representable range`
+    `${ISODateTimeToString(isoDateTime, 'iso8601', 'auto', 'never')} is outside the representable range`
   );
 }
 
diff --git a/polyfill/lib/intl.mjs b/polyfill/lib/intl.mjs
index 6d4768fb0..0193050fa 100644
--- a/polyfill/lib/intl.mjs
+++ b/polyfill/lib/intl.mjs
@@ -424,17 +424,15 @@ function formatRange(a, b) {
   let formatter;
   let aDayAdjust = 0;
   let bDayAdjust = 0;
-  if (isTemporalObject(a) || isTemporalObject(b)) {
+  if (isFormattableTemporalObject(a) || isFormattableTemporalObject(b)) {
     if (!sameTemporalType(a, b)) {
       throw new TypeErrorCtor('Intl.DateTimeFormat.formatRange accepts two values of the same type');
     }
     const aRecord = extractOverrides(a, this);
     const bRecord = extractOverrides(b, this);
-    if (aRecord.formatter) {
-      assert(bRecord.formatter == aRecord.formatter, 'formatters for same Temporal type should be identical');
-      formatter = aRecord.formatter;
-      formatArgs = [ES.epochNsToMs(aRecord.epochNs, 'floor'), ES.epochNsToMs(bRecord.epochNs, 'floor')];
-    }
+    assert(bRecord.formatter == aRecord.formatter, 'formatters for same Temporal type should be identical');
+    formatter = aRecord.formatter;
+    formatArgs = [ES.epochNsToMs(aRecord.epochNs, 'floor'), ES.epochNsToMs(bRecord.epochNs, 'floor')];
     aDayAdjust = aRecord.dayAdjust ?? 0;
     bDayAdjust = bRecord.dayAdjust ?? 0;
   } else {
@@ -482,17 +480,15 @@ function formatRangeToParts(a, b) {
   let formatter;
   let aDayAdjust = 0;
   let bDayAdjust = 0;
-  if (isTemporalObject(a) || isTemporalObject(b)) {
+  if (isFormattableTemporalObject(a) || isFormattableTemporalObject(b)) {
     if (!sameTemporalType(a, b)) {
       throw new TypeErrorCtor('Intl.DateTimeFormat.formatRangeToParts accepts two values of the same type');
     }
     const aRecord = extractOverrides(a, this);
     const bRecord = extractOverrides(b, this);
-    if (aRecord.formatter) {
-      assert(bRecord.formatter == aRecord.formatter, 'formatters for same Temporal type should be identical');
-      formatter = aRecord.formatter;
-      formatArgs = [ES.epochNsToMs(aRecord.epochNs, 'floor'), ES.epochNsToMs(bRecord.epochNs, 'floor')];
-    }
+    assert(bRecord.formatter == aRecord.formatter, 'formatters for same Temporal type should be identical');
+    formatter = aRecord.formatter;
+    formatArgs = [ES.epochNsToMs(aRecord.epochNs, 'floor'), ES.epochNsToMs(bRecord.epochNs, 'floor')];
     aDayAdjust = aRecord.dayAdjust ?? 0;
     bDayAdjust = bRecord.dayAdjust ?? 0;
   } else {
@@ -740,7 +736,7 @@ function hasAnyDateTimeOptions(originalOptions) {
   return hasDateOptions(originalOptions) || hasTimeOptions(originalOptions);
 }
 
-function isTemporalObject(obj) {
+function isFormattableTemporalObject(obj) {
   return (
     ES.IsTemporalDate(obj) ||
     ES.IsTemporalTime(obj) ||
@@ -753,12 +749,12 @@ function isTemporalObject(obj) {
 }
 
 function toDateTimeFormattable(value) {
-  if (isTemporalObject(value)) return value;
+  if (isFormattableTemporalObject(value)) return value;
   return ES.ToNumber(value);
 }
 
 function sameTemporalType(x, y) {
-  if (!isTemporalObject(x) || !isTemporalObject(y)) return false;
+  if (!isFormattableTemporalObject(x) || !isFormattableTemporalObject(y)) return false;
   if (ES.IsTemporalTime(x) && !ES.IsTemporalTime(y)) return false;
   if (ES.IsTemporalDate(x) && !ES.IsTemporalDate(y)) return false;
   if (ES.IsTemporalDateTime(x) && !ES.IsTemporalDateTime(y)) return false;
diff --git a/polyfill/test262 b/polyfill/test262
index ac3a4ba5b..d0c1b4555 160000
--- a/polyfill/test262
+++ b/polyfill/test262
@@ -1 +1 @@
-Subproject commit ac3a4ba5ba9e67be0472a3853e5db9810e43f8cf
+Subproject commit d0c1b4555b03dd404873fd6422a4b5da00136500