diff --git a/test/built-ins/Temporal/Instant/compare/instant-string-limits.js b/test/built-ins/Temporal/Instant/compare/instant-string-limits.js
new file mode 100644
index 0000000000..a664a3fcbf
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/compare/instant-string-limits.js
@@ -0,0 +1,48 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const minInstant = new Temporal.Instant(-86400_00000000_000_000_000n);
+const maxInstant = new Temporal.Instant(86400_00000000_000_000_000n);
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(Temporal.Instant.compare(str, minInstant), 0, `instant string ${str} should be valid (first argument)`);
+  assert.sameValue(Temporal.Instant.compare(minInstant, str), 0, `instant string ${str} should be valid (second argument)`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(Temporal.Instant.compare(str, maxInstant), 0, `instant string ${str} should be valid (first argument)`);
+  assert.sameValue(Temporal.Instant.compare(maxInstant, str), 0, `instant string ${str} should be valid (second argument)`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => Temporal.Instant.compare(str, minInstant), `instant string ${str} should not be valid (first argument)`);
+  assert.throws(RangeError, () => Temporal.Instant.compare(minInstant, str), `instant string ${str} should not be valid (second argument)`);
+}
diff --git a/test/built-ins/Temporal/Instant/from/instant-string-limits.js b/test/built-ins/Temporal/Instant/from/instant-string-limits.js
new file mode 100644
index 0000000000..414c505aa4
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/from/instant-string-limits.js
@@ -0,0 +1,45 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const minInstant = new Temporal.Instant(-86400_00000000_000_000_000n);
+const maxInstant = new Temporal.Instant(86400_00000000_000_000_000n);
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(Temporal.Instant.from(str).epochNanoseconds, minInstant.epochNanoseconds, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(Temporal.Instant.from(str).epochNanoseconds, maxInstant.epochNanoseconds, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => Temporal.Instant.from(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/Instant/prototype/equals/instant-string-limits.js b/test/built-ins/Temporal/Instant/prototype/equals/instant-string-limits.js
new file mode 100644
index 0000000000..d64d14f1d3
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/equals/instant-string-limits.js
@@ -0,0 +1,45 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const minInstant = new Temporal.Instant(-86400_00000000_000_000_000n);
+const maxInstant = new Temporal.Instant(86400_00000000_000_000_000n);
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(minInstant.equals(str), true, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(maxInstant.equals(str), true, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => minInstant.equals(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/Instant/prototype/since/instant-string-limits.js b/test/built-ins/Temporal/Instant/prototype/since/instant-string-limits.js
new file mode 100644
index 0000000000..8cedce299e
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/instant-string-limits.js
@@ -0,0 +1,46 @@
+// 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: String arguments at the limit of the representable range
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const minInstant = new Temporal.Instant(-86400_00000000_000_000_000n);
+const maxInstant = new Temporal.Instant(86400_00000000_000_000_000n);
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  TemporalHelpers.assertDuration(minInstant.since(str), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  TemporalHelpers.assertDuration(maxInstant.since(str), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => minInstant.since(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/Instant/prototype/until/instant-string-limits.js b/test/built-ins/Temporal/Instant/prototype/until/instant-string-limits.js
new file mode 100644
index 0000000000..0fb0902a9a
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/instant-string-limits.js
@@ -0,0 +1,46 @@
+// 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: String arguments at the limit of the representable range
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const minInstant = new Temporal.Instant(-86400_00000000_000_000_000n);
+const maxInstant = new Temporal.Instant(86400_00000000_000_000_000n);
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  TemporalHelpers.assertDuration(minInstant.until(str), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  TemporalHelpers.assertDuration(maxInstant.until(str), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => minInstant.until(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/instant-string-limits.js b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/instant-string-limits.js
new file mode 100644
index 0000000000..81f142ef7b
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getNextTransition/instant-string-limits.js
@@ -0,0 +1,44 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(instance.getNextTransition(str), null, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(instance.getNextTransition(str), null, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => instance.getNextTransition(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/instant-string-limits.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/instant-string-limits.js
new file mode 100644
index 0000000000..a0fbbb92e2
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetNanosecondsFor/instant-string-limits.js
@@ -0,0 +1,44 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(instance.getOffsetNanosecondsFor(str), 0, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(instance.getOffsetNanosecondsFor(str), 0, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => instance.getOffsetNanosecondsFor(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/instant-string-limits.js b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/instant-string-limits.js
new file mode 100644
index 0000000000..02a4200b39
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/instant-string-limits.js
@@ -0,0 +1,44 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(instance.getOffsetStringFor(str), "+00:00", `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(instance.getOffsetStringFor(str), "+00:00", `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => instance.getOffsetStringFor(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/instant-string-limits.js b/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/instant-string-limits.js
new file mode 100644
index 0000000000..65b5de1c9e
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPlainDateTimeFor/instant-string-limits.js
@@ -0,0 +1,45 @@
+// 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: String arguments at the limit of the representable range
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  TemporalHelpers.assertPlainDateTime(instance.getPlainDateTimeFor(str), -271821, 4, "M04", 20, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  TemporalHelpers.assertPlainDateTime(instance.getPlainDateTimeFor(str), 275760, 9, "M09", 13, 0, 0, 0, 0, 0, 0, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => instance.getPlainDateTimeFor(str), `instant string ${str} should not be valid`);
+}
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/instant-string-limits.js b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/instant-string-limits.js
new file mode 100644
index 0000000000..5f0afdbdec
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPreviousTransition/instant-string-limits.js
@@ -0,0 +1,44 @@
+// 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: String arguments at the limit of the representable range
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const minInstantStrings = [
+  "-271821-04-20T00:00Z",
+  "-271821-04-19T23:00-01:00",
+  "-271821-04-19T00:00:00.000000001-23:59:59.999999999",
+];
+for (const str of minInstantStrings) {
+  assert.sameValue(instance.getPreviousTransition(str), null, `instant string ${str} should be valid`);
+}
+
+const maxInstantStrings = [
+  "+275760-09-13T00:00Z",
+  "+275760-09-13T01:00+01:00",
+  "+275760-09-13T23:59:59.999999999+23:59:59.999999999",
+];
+
+for (const str of maxInstantStrings) {
+  assert.sameValue(instance.getPreviousTransition(str), null, `instant string ${str} should be valid`);
+}
+
+const outOfRangeInstantStrings = [
+  "-271821-04-19T23:59:59.999999999Z",
+  "-271821-04-19T23:00-00:59:59.999999999",
+  "-271821-04-19T00:00:00-23:59:59.999999999",
+  "-271821-04-19T00:00:00-24:00",
+  "+275760-09-13T00:00:00.000000001Z",
+  "+275760-09-13T01:00+00:59:59.999999999",
+  "+275760-09-14T00:00+23:59:59.999999999",
+  "+275760-09-14T00:00+24:00",
+];
+
+for (const str of outOfRangeInstantStrings) {
+  assert.throws(RangeError, () => instance.getPreviousTransition(str), `instant string ${str} should not be valid`);
+}