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diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/largest-unit-month.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/largest-unit-month.js
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/largest-unit-month.js
@@ -0,0 +1,97 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateuntil
+description: Temporal.Calendar.prototype.dateUntil with largestUnit is "month"
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. Set one to ? ToTemporalDate(one).
+  5. Set two to ? ToTemporalDate(two).
+  6. Set options to ? GetOptionsObject(options).
+  7. Let largestUnit be ? ToLargestTemporalUnit(options, « "hour", "minute", "second", "millisecond", "microsecond", "nanosecond" », "auto", "day").
+  8. Let result be ! DifferenceISODate(one.[[ISOYear]], one.[[ISOMonth]], one.[[ISODay]], two.[[ISOYear]], two.[[ISOMonth]], two.[[ISODay]], largestUnit).
+  9. Return ? CreateTemporalDuration(result.[[Years]], result.[[Months]], result.[[Weeks]], result.[[Days]], 0, 0, 0, 0, 0, 0).
+features: [Temporal]
+includes: [temporalHelpers.js]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+["month", "months"].forEach(function(largestUnit) {
+  let opt = {largestUnit};
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-07-16", opt),
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "same day");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-07-17", opt),
+      0, 0, 0, 1, 0, 0, 0, 0, 0, 0, "one day");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-07-23", opt),
+      0, 0, 0, 7, 0, 0, 0, 0, 0, 0, "7 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-08-16", opt),
+      0, 1, 0, 0, 0, 0, 0, 0, 0, 0, "1 month in same year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2020-12-16", "2021-01-16", opt),
+      0, 1, 0, 0, 0, 0, 0, 0, 0, 0, "1 month in different year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-01-05", "2021-02-05", opt),
+      0, 1, 0, 0, 0, 0, 0, 0, 0, 0, "1 month in same year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-01-07", "2021-03-07", opt),
+      0, 2, 0, 0, 0, 0, 0, 0, 0, 0, "2 month in same year across Feb 28");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-08-17", opt),
+      0, 1, 0, 1, 0, 0, 0, 0, 0, 0, "1 month and 1 day in a month with 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-08-13", opt),
+      0, 0, 0, 28, 0, 0, 0, 0, 0, 0, "28 days roll across a month which has 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2021-09-16", opt),
+      0, 2, 0, 0, 0, 0, 0, 0, 0, 0, "2 months with both months which have 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2022-07-16", opt),
+      0, 12, 0, 0, 0, 0, 0, 0, 0, 0, "12 months");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-16", "2031-07-16", opt),
+      0, 120, 0, 0, 0, 0, 0, 0, 0, 0, "120 months");
+
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-17", "2021-07-16", opt),
+      0, 0, 0, -1, 0, 0, 0, 0, 0, 0, "negative one day");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-07-23", "2021-07-16", opt),
+      0, 0, 0, -7, 0, 0, 0, 0, 0, 0, "negative 7 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-08-16", "2021-07-16", opt),
+      0, -1, 0, 0, 0, 0, 0, 0, 0, 0, "negative 1 month in same year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-01-16", "2020-12-16", opt),
+      0, -1, 0, 0, 0, 0, 0, 0, 0, 0, "negative 1 month in different year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-02-05", "2021-01-05", opt),
+      0, -1, 0, 0, 0, 0, 0, 0, 0, 0, "negative 1 month in same year");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-03-07", "2021-01-07", opt),
+      0, -2, 0, 0, 0, 0, 0, 0, 0, 0, "negative 2 month in same year across Feb 28");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-08-17", "2021-07-16", opt),
+      0, -1, 0, -1, 0, 0, 0, 0, 0, 0, "negative 1 month and 1 day in a month with 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-08-13", "2021-07-16", opt),
+      0, 0, 0, -28, 0, 0, 0, 0, 0, 0, "negative 28 days roll across a month which has 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2021-09-16", "2021-07-16", opt),
+      0, -2, 0, 0, 0, 0, 0, 0, 0, 0, "negative 2 months with both months which have 31 days");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2022-07-16", "2021-07-16", opt),
+      0, -12, 0, 0, 0, 0, 0, 0, 0, 0, "negative 12 months");
+  TemporalHelpers.assertDuration(
+      cal.dateUntil("2031-07-16", "2021-07-16", opt),
+      0, -120, 0, 0, 0, 0, 0, 0, 0, 0, "negative 120 months");
+});
+
+reportCompare(0, 0);