diff --git a/test/built-ins/Temporal/Calendar/prototype/dateAdd/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/dateAdd/year-zero.js
new file mode 100644
index 00000000000..91e4a0a1ddc
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateAdd/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateadd
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.dateAdd(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/dateUntil/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/dateUntil/year-zero.js
new file mode 100644
index 00000000000..effb46112b5
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateUntil/year-zero.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateuntil
+description: Negative zero, as extended year, is invalid
+features: [Temporal]
+---*/
+
+const calendar = new Temporal.Calendar("iso8601");
+const date = new Temporal.PlainDate(2000, 5, 2);
+const bad = "-000000-03-14";
+
+assert.throws(
+  RangeError,
+  () => calendar.dateUntil(bad, date),
+  "cannot use minus zero as extended date (first argument)"
+);
+
+assert.throws(
+  RangeError,
+  () => calendar.dateUntil(date, bad),
+  "cannot use minus zero as extended date (second argument)"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/day/year-zero.js
new file mode 100644
index 00000000000..555a3f62c0f
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.day(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/year-zero.js
new file mode 100644
index 00000000000..18ab7a6827b
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofweek
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.dayOfWeek(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfYear/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/year-zero.js
new file mode 100644
index 00000000000..e31b2141169
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofyear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.dayOfYear(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInMonth/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/year-zero.js
new file mode 100644
index 00000000000..c2c6204ed69
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinmonth
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.daysInMonth(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInWeek/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/year-zero.js
new file mode 100644
index 00000000000..b852ef78140
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinweek
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.daysInWeek(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInYear/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/daysInYear/year-zero.js
new file mode 100644
index 00000000000..4c226015b22
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinyear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.daysInYear(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/inLeapYear/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/year-zero.js
new file mode 100644
index 00000000000..8aeb7c2a761
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.inleapyear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.inLeapYear(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/month/year-zero.js
new file mode 100644
index 00000000000..f42751175ad
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.month(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/year-zero.js
new file mode 100644
index 00000000000..fc81c5348e2
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthcode
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.monthCode(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthsInYear/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/year-zero.js
new file mode 100644
index 00000000000..0451a665599
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthsinyear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.monthsInYear(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/weekOfYear/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/year-zero.js
new file mode 100644
index 00000000000..44eeabb3218
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.weekofyear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.weekOfYear(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/year-zero.js b/test/built-ins/Temporal/Calendar/prototype/year/year-zero.js
new file mode 100644
index 00000000000..6221b7db925
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.year(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Duration/compare/year-zero.js b/test/built-ins/Temporal/Duration/compare/year-zero.js
new file mode 100644
index 00000000000..b0088aabda9
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/compare/year-zero.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.compare
+description: Negative zero, as an extended year, fails
+features: [Temporal]
+---*/
+
+const duration1 = new Temporal.Duration(1);
+const duration2 = new Temporal.Duration(2);
+const bad = "-000000-11-01";
+
+assert.throws(
+  RangeError,
+  () => Temporal.Duration.compare(duration1, duration2, { relativeTo: bad }),
+  "Cannot use negative zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Duration/prototype/add/year-zero.js b/test/built-ins/Temporal/Duration/prototype/add/year-zero.js
new file mode 100644
index 00000000000..cf807d355bb
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/add/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.add
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const instance = new Temporal.Duration(1, 0, 0, 1);
+
+let relativeTo = "-000000-11-04T00:00";
+assert.throws(
+  RangeError,
+  () => { instance.add(new Temporal.Duration(0, 0, 0, 0, -24), { relativeTo }); },
+  "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Duration/prototype/round/year-zero.js b/test/built-ins/Temporal/Duration/prototype/round/year-zero.js
new file mode 100644
index 00000000000..041f7c26b8a
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/round/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.round
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const instance = new Temporal.Duration(1, 0, 0, 0, 24);
+
+let relativeTo = "-000000-11-04T00:00";
+assert.throws(
+  RangeError,
+  () => { instance.round({ largestUnit: "years", relativeTo }); },
+  "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Duration/prototype/subtract/year-zero.js b/test/built-ins/Temporal/Duration/prototype/subtract/year-zero.js
new file mode 100644
index 00000000000..bee08e7a148
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/subtract/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.subtract
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const instance = new Temporal.Duration(1, 0, 0, 1);
+
+let relativeTo = "-000000-11-04T00:00";
+assert.throws(
+  RangeError,
+  () => { instance.subtract(new Temporal.Duration(0, 0, 0, 0, 24), { relativeTo }); },
+  "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Duration/prototype/total/year-zero.js b/test/built-ins/Temporal/Duration/prototype/total/year-zero.js
new file mode 100644
index 00000000000..28d72b9ed1a
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/total/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.total
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const instance = new Temporal.Duration(1, 0, 0, 0, 24);
+
+let relativeTo = "-000000-11-04T00:00";
+assert.throws(
+  RangeError,
+  () => { instance.total({ unit: "days", relativeTo }); },
+  "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/Instant/compare/year-zero.js b/test/built-ins/Temporal/Instant/compare/year-zero.js
new file mode 100644
index 00000000000..e6bb684d438
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/compare/year-zero.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.compare
+description: Negative zero, as an extended year, fails
+features: [Temporal]
+---*/
+
+const instance = new Temporal.Instant(0n);
+const bad = '-000000-03-30T00:45Z';
+
+assert.throws(RangeError,
+  () => Temporal.Instant.compare(bad, instance),
+  "minus zero is invalid extended year (first argument)");
+assert.throws(RangeError,
+  () => Temporal.Instant.compare(instance, bad),
+  "minus zero is invalid extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/Instant/from/year-zero.js b/test/built-ins/Temporal/Instant/from/year-zero.js
new file mode 100644
index 00000000000..b21396b8948
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/from/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+  "-000000-03-31T00:45Z",
+  "-000000-03-31T01:45+01:00",
+  "-000000-03-31T01:45:00+01:00[UTC]"
+];
+
+invalidStrings.forEach((str) => {
+  assert.throws(
+    RangeError,
+    () => Temporal.Instant.from(str),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/Instant/prototype/equals/year-zero.js b/test/built-ins/Temporal/Instant/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..d2932d28889
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/equals/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+    "-000000-03-30T00:45Z",
+    "-000000-03-30T01:45+01:00",
+    "-000000-03-30T01:45:00+01:00[UTC]"
+];
+const instance = new Temporal.Instant(0n);
+invalidStrings.forEach((str) => {
+  assert.throws(
+    RangeError,
+    () => instance.equals(str),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/Instant/prototype/since/year-zero.js b/test/built-ins/Temporal/Instant/prototype/since/year-zero.js
new file mode 100644
index 00000000000..38bf10fd673
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.since
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+    "-000000-03-30T00:45Z",
+    "-000000-03-30T01:45+01:00",
+    "-000000-03-30T01:45:00+01:00[UTC]"
+];
+const instance = new Temporal.Instant(0n);
+invalidStrings.forEach((str) => {
+  assert.throws(
+    RangeError,
+    () => instance.since(str),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/Instant/prototype/until/year-zero.js b/test/built-ins/Temporal/Instant/prototype/until/year-zero.js
new file mode 100644
index 00000000000..28953c09e54
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.until
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+    "-000000-03-30T00:45Z",
+    "-000000-03-30T01:45+01:00",
+    "-000000-03-30T01:45:00+01:00[UTC]"
+];
+const instance = new Temporal.Instant(0n);
+invalidStrings.forEach((str) => {
+  assert.throws(
+    RangeError,
+    () => instance.until(str),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDate/compare/year-zero.js b/test/built-ins/Temporal/PlainDate/compare/year-zero.js
new file mode 100644
index 00000000000..75f79cf98e9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/compare/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Negative zero, as an extended year, fails
+esid: sec-temporal.plaindate.compare
+features: [Temporal]
+---*/
+
+const instance = new Temporal.PlainDate(2000, 5, 2);
+const bad = "-000000-08-24";
+
+assert.throws(RangeError,
+  () => Temporal.PlainDate.compare(bad, instance),
+  "Minus zero is an invalid extended year (first argument)"
+);
+
+assert.throws(RangeError,
+  () => Temporal.PlainDate.compare(instance, bad),
+  "Minus zero is an invalid extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/PlainDate/from/year-zero.js b/test/built-ins/Temporal/PlainDate/from/year-zero.js
new file mode 100644
index 00000000000..0e000677f21
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/from/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const arg = "-000000-10-31";
+
+assert.throws(
+    RangeError,
+    () => { Temporal.PlainDate.from(arg); },
+    "reject minus zero as extended year"
+);
+
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/year-zero.js b/test/built-ins/Temporal/PlainDate/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..486a5da1ac2
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainDate(2000, 5, 2);
+
+assert.throws(
+    RangeError,
+    () => { instance.equals(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainDate/prototype/since/year-zero.js b/test/built-ins/Temporal/PlainDate/prototype/since/year-zero.js
new file mode 100644
index 00000000000..9f83cc531c0
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/since/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.since
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainDate(2000, 5, 2);
+
+assert.throws(
+    RangeError,
+    () => { instance.since(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/year-zero.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/year-zero.js
new file mode 100644
index 00000000000..0e1d2834749
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainDateTime/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplaindatetime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainDate(2000, 5, 2);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.toPlainDateTime(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/year-zero.js b/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/year-zero.js
new file mode 100644
index 00000000000..33387244aae
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toZonedDateTime/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.tozoneddatetime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainDate(2000, 5, 2);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.toZonedDateTime({ plainTime: arg, timeZone: "UTC" }),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDate/prototype/until/year-zero.js b/test/built-ins/Temporal/PlainDate/prototype/until/year-zero.js
new file mode 100644
index 00000000000..28a78617277
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/until/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.until
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainDate(2000, 5, 2);
+
+assert.throws(
+    RangeError,
+    () => { instance.until(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainDateTime/compare/year-zero.js b/test/built-ins/Temporal/PlainDateTime/compare/year-zero.js
new file mode 100644
index 00000000000..f32f6cb0e31
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/compare/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Negative zero, as an extended year, fails
+esid: sec-temporal.plaindatetime.compare
+features: [Temporal]
+---*/
+
+const ok = new Temporal.PlainDateTime(2000, 5, 2, 15);
+const bad = "-000000-12-07T03:24:30";
+
+assert.throws(RangeError,
+  () => Temporal.PlainDateTime.compare(bad,ok),
+  "Cannot use minus zero as extended year (first argument)"
+);
+
+assert.throws(RangeError,
+  () => Temporal.PlainDateTime.compare(ok, bad),
+  "Cannot use minus zero as extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/PlainDateTime/from/year-zero.js b/test/built-ins/Temporal/PlainDateTime/from/year-zero.js
new file mode 100644
index 00000000000..7f21302a3bc
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/from/year-zero.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { Temporal.PlainDateTime.from(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/year-zero.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..175c2d70166
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { instance.equals(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/since/year-zero.js b/test/built-ins/Temporal/PlainDateTime/prototype/since/year-zero.js
new file mode 100644
index 00000000000..e7b6146a579
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/since/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.since
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { instance.since(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/until/year-zero.js b/test/built-ins/Temporal/PlainDateTime/prototype/until/year-zero.js
new file mode 100644
index 00000000000..028410a06d5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/until/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.until
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { instance.until(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/year-zero.js b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/year-zero.js
new file mode 100644
index 00000000000..392a7ec2c07
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withplaindate
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+
+assert.throws(
+    RangeError,
+    () => { instance.withPlainDate(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/year-zero.js b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/year-zero.js
new file mode 100644
index 00000000000..0b74c516c6c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainTime/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withplaintime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.withPlainTime(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainMonthDay/from/year-zero.js b/test/built-ins/Temporal/PlainMonthDay/from/year-zero.js
new file mode 100644
index 00000000000..347dba09282
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/from/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+    "-000000-08",
+    "-000000-08-24",
+    "-000000-08-24T15:43:27",
+    "-000000-08-24T15:43:27+01:00[UTC]"
+];
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { Temporal.PlainMonthDay.from(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/equals/year-zero.js b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..f420f38b46a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+    "-000000-08",
+    "-000000-08-24",
+    "-000000-08-24T15:43:27",
+    "-000000-08-24T15:43:27+01:00[UTC]"
+];
+const instance = new Temporal.PlainMonthDay(5, 2);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.equals(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainTime/compare/year-zero.js b/test/built-ins/Temporal/PlainTime/compare/year-zero.js
new file mode 100644
index 00000000000..470b42fda1c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/compare/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.compare
+description: Negative zero, as an extended year, fails
+features: [Temporal]
+---*/
+
+const time = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+const bad = "-000000-12-07T03:24:30";
+
+assert.throws(
+  RangeError,
+  () => Temporal.PlainTime.compare(bad, time),
+  "Cannot use minus zero as extended year (first argument)"
+);
+
+assert.throws(
+  RangeError,
+  () => Temporal.PlainTime.compare(time, bad),
+  "Cannot use minus zero as extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/PlainTime/from/year-zero.js b/test/built-ins/Temporal/PlainTime/from/year-zero.js
new file mode 100644
index 00000000000..671e5c5c68a
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/from/year-zero.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { Temporal.PlainTime.from(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainTime/prototype/equals/year-zero.js b/test/built-ins/Temporal/PlainTime/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..c58365d4b05
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/equals/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.equals(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainTime/prototype/since/year-zero.js b/test/built-ins/Temporal/PlainTime/prototype/since/year-zero.js
new file mode 100644
index 00000000000..1124fe8a771
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/since/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.since
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.since(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/year-zero.js b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/year-zero.js
new file mode 100644
index 00000000000..481f20b37af
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.toplaindatetime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+
+assert.throws(
+    RangeError,
+    () => { instance.toPlainDateTime(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/year-zero.js b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/year-zero.js
new file mode 100644
index 00000000000..d5381ad4050
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tozoneddatetime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+
+assert.throws(
+    RangeError,
+    () => { instance.toZonedDateTime({ plainDate: arg }); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/PlainTime/prototype/until/year-zero.js b/test/built-ins/Temporal/PlainTime/prototype/until/year-zero.js
new file mode 100644
index 00000000000..759782e9bb1
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/until/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.until
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.until(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainYearMonth/compare/year-zero.js b/test/built-ins/Temporal/PlainYearMonth/compare/year-zero.js
new file mode 100644
index 00000000000..5d1a6cd03ee
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/compare/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Negative zero, as an extended year, fails
+esid: sec-temporal.plainyearmonth.compare
+features: [Temporal]
+---*/
+
+const ok = new Temporal.PlainYearMonth(2000, 5);
+const bad = "-000000-06";
+
+assert.throws(
+  RangeError,
+  () => Temporal.PlainYearMonth.compare(bad, ok),
+  "Cannot use minus zero as extended year (first argument)"
+);
+
+assert.throws(
+  RangeError,
+  () => Temporal.PlainYearMonth.compare(ok, bad),
+  "Cannot use minus zero as extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/PlainYearMonth/from/year-zero.js b/test/built-ins/Temporal/PlainYearMonth/from/year-zero.js
new file mode 100644
index 00000000000..1d8c7b3af73
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/from/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-06',
+  '-000000-06-24',
+  '-000000-06-24T15:43:27',
+  '-000000-06-24T15:43:27+01:00[UTC]'
+];
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { Temporal.PlainYearMonth.from(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/equals/year-zero.js b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..9ab97736fd5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.equals
+description: RangeError thrown if a string with UTC designator is used as a PlainYearMonth
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-06',
+  '-000000-06-24',
+  '-000000-06-24T15:43:27',
+  '-000000-06-24T15:43:27+01:00[UTC]'
+];
+const instance = new Temporal.PlainYearMonth(2000, 5);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.equals(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/since/year-zero.js b/test/built-ins/Temporal/PlainYearMonth/prototype/since/year-zero.js
new file mode 100644
index 00000000000..e1b96103831
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/since/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: RangeError thrown if a string with UTC designator is used as a PlainYearMonth
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-06',
+  '-000000-06-24',
+  '-000000-06-24T15:43:27',
+  '-000000-06-24T15:43:27+01:00[UTC]'
+];
+const instance = new Temporal.PlainYearMonth(2000, 5);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.since(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/until/year-zero.js b/test/built-ins/Temporal/PlainYearMonth/prototype/until/year-zero.js
new file mode 100644
index 00000000000..b2f534aeff7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/until/year-zero.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.until
+description: RangeError thrown if a string with UTC designator is used as a PlainYearMonth
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-06',
+  '-000000-06-24',
+  '-000000-06-24T15:43:27',
+  '-000000-06-24T15:43:27+01:00[UTC]'
+];
+const instance = new Temporal.PlainYearMonth(2000, 5);
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.until(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/year-zero.js
new file mode 100644
index 00000000000..dfa1f9121d0
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getinstantfor
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+const instance = new Temporal.TimeZone("UTC");
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { instance.getInstantFor(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/year-zero.js
new file mode 100644
index 00000000000..f93af181509
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/year-zero.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getnexttransition
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+let str = "-000000-01-01T00:00";
+assert.throws(RangeError, () => instance.getNextTransition(str), "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/year-zero.js
new file mode 100644
index 00000000000..91275f98364
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/year-zero.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getoffsetnanosecondsfor
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+let str = "-000000-01-01T00:00";
+assert.throws(RangeError, () => instance.getOffsetNanosecondsFor(str), "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/year-zero.js
new file mode 100644
index 00000000000..3840a51ff8f
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/year-zero.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getoffsetstringfor
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+let str = "-000000-01-01T00:00";
+assert.throws(RangeError, () => instance.getOffsetStringFor(str), "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/year-zero.js
new file mode 100644
index 00000000000..d15162a5e7e
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/year-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getplaindatetimefor
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+    "-000000-03-30T00:45Z",
+    "-000000-03-30T01:45+01:00",
+    "-000000-03-30T01:45:00+01:00[UTC]"
+];
+const instance = new Temporal.TimeZone("UTC");
+invalidStrings.forEach((str) => {
+  assert.throws(
+    RangeError,
+    () => instance.getPlainDateTimeFor(str),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/year-zero.js
new file mode 100644
index 00000000000..e6efaf6004a
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getpossibleinstantsfor
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  "-000000-12-07T03:24:30",
+  "-000000-12-07T03:24:30+01:00[UTC]"
+];
+const instance = new Temporal.TimeZone("UTC");
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => { instance.getPossibleInstantsFor(arg); },
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/year-zero.js b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/year-zero.js
new file mode 100644
index 00000000000..55865672105
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/year-zero.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getprevioustransition
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+let str = "-000000-01-01T00:00";
+assert.throws(RangeError, () => instance.getPreviousTransition(str), "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/compare/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/compare/year-zero.js
new file mode 100644
index 00000000000..314b364b42d
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/compare/year-zero.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.compare
+description: Negative zero, as an extended year, fails
+features: [Temporal]
+---*/
+
+const instance = new Temporal.ZonedDateTime(0n, "UTC");
+const bad = "-000000-08-19T17:30Z";
+
+assert.throws(RangeError,
+  () => Temporal.ZonedDateTime.compare(bad, instance),
+  "cannot use negative zero as extended year (first argument)"
+);
+assert.throws(RangeError,
+  () => Temporal.ZonedDateTime.compare(instance, bad),
+  "cannot use negative zero as extended year (second argument)"
+);
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/from/year-zero.js
new file mode 100644
index 00000000000..da7638028a0
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/from/year-zero.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.from
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const str = "-0000000-01-01T00:02:00.000000000+00:00[UTC]";
+
+assert.throws(RangeError, () => { Temporal.ZonedDateTime.from(str); }, "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/equals/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/year-zero.js
new file mode 100644
index 00000000000..f7030e4d6a9
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/year-zero.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.equals
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const str = "-0000000-01-01T00:02:00.000000000+00:00[UTC]";
+
+assert.throws(RangeError, () => { instance.equals(str); }, "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/since/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/prototype/since/year-zero.js
new file mode 100644
index 00000000000..71271b197b4
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/since/year-zero.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.since
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const str = "-0000000-01-01T00:02:00.000000000+00:00[UTC]";
+
+assert.throws(RangeError, () => { instance.since(str); }, "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/until/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/prototype/until/year-zero.js
new file mode 100644
index 00000000000..0a8b5e6cb16
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/until/year-zero.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.until
+description: Negative zero, as an extended year, is rejected
+features: [Temporal]
+---*/
+
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const str = "-0000000-01-01T00:02:00.000000000+00:00[UTC]";
+
+assert.throws(RangeError, () => { instance.until(str); }, "reject minus zero as extended year");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/year-zero.js
new file mode 100644
index 00000000000..0c66b19fd14
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withplaindate
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC");
+
+assert.throws(
+    RangeError,
+    () => { instance.withPlainDate(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/year-zero.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/year-zero.js
new file mode 100644
index 00000000000..13f6ae25186
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainTime/year-zero.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withplaintime
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const invalidStrings = [
+  '-000000-12-07T03:24:30',
+  '-000000-12-07T03:24:30+01:00[UTC]'
+];
+const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC");
+invalidStrings.forEach((arg) => {
+  assert.throws(
+    RangeError,
+    () => instance.withPlainTime(arg),
+    "reject minus zero as extended year"
+  );
+});
diff --git a/test/intl402/Temporal/Calendar/prototype/era/year-zero.js b/test/intl402/Temporal/Calendar/prototype/era/year-zero.js
new file mode 100644
index 00000000000..ed3d5134f74
--- /dev/null
+++ b/test/intl402/Temporal/Calendar/prototype/era/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.era
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.era(arg); },
+    "reject minus zero as extended year"
+);
diff --git a/test/intl402/Temporal/Calendar/prototype/eraYear/year-zero.js b/test/intl402/Temporal/Calendar/prototype/eraYear/year-zero.js
new file mode 100644
index 00000000000..22bcccd92cf
--- /dev/null
+++ b/test/intl402/Temporal/Calendar/prototype/eraYear/year-zero.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.erayear
+description: Negative zero, as an extended year, is rejected
+features: [Temporal, arrow-function]
+---*/
+
+const arg = "-000000-10-31";
+const instance = new Temporal.Calendar("iso8601");
+
+assert.throws(
+    RangeError,
+    () => { instance.eraYear(arg); },
+    "reject minus zero as extended year"
+);