diff --git a/test/staging/Temporal/Instant/old/compare.js b/test/built-ins/Temporal/Instant/compare/cross-epoch.js
similarity index 55%
rename from test/staging/Temporal/Instant/old/compare.js
rename to test/built-ins/Temporal/Instant/compare/cross-epoch.js
index 2534bf6245..47522d2c59 100644
--- a/test/staging/Temporal/Instant/old/compare.js
+++ b/test/built-ins/Temporal/Instant/compare/cross-epoch.js
@@ -2,20 +2,20 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.compare works
+esid: sec-temporal.instant.compare
+description: Temporal.Instant.compare works cross-epoch.
 features: [Temporal]
 ---*/
 
-var i1 = Temporal.Instant.from("1963-02-13T09:36:29.123456789Z");
-var i2 = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
-var i3 = Temporal.Instant.from("1981-12-15T14:34:31.987654321Z");
+const i1 = Temporal.Instant.from("1963-02-13T09:36:29.123456789Z");
+const i2 = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const i3 = Temporal.Instant.from("1981-12-15T14:34:31.987654321Z");
 
 // pre epoch equal
-assert.sameValue(Temporal.Instant.compare(i1, Temporal.Instant.from(i1)), 0)
+assert.sameValue(Temporal.Instant.compare(i1, i1), 0)
 
 // epoch equal
-assert.sameValue(Temporal.Instant.compare(i2, Temporal.Instant.from(i2)), 0)
+assert.sameValue(Temporal.Instant.compare(i2, i2), 0)
 
 // cross epoch smaller/larger
 assert.sameValue(Temporal.Instant.compare(i1, i2), -1)
diff --git a/test/built-ins/Temporal/Instant/fromEpochMilliseconds/limits.js b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/limits.js
new file mode 100644
index 0000000000..40d3b129bf
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/limits.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2018 Bloomberg LP. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.fromepochmilliseconds
+description: Min/max range.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+
+// constructing from ms
+var limit = 8640000000000000;
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(-limit - 1));
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(limit + 1));
+TemporalHelpers.assertInstantsEqual(Temporal.Instant.fromEpochMilliseconds(-limit),
+                                    Temporal.Instant.from("-271821-04-20T00:00:00Z"));
+TemporalHelpers.assertInstantsEqual(Temporal.Instant.fromEpochMilliseconds(limit),
+                                    Temporal.Instant.from("+275760-09-13T00:00:00Z"));
+
diff --git a/test/built-ins/Temporal/Instant/limits.js b/test/built-ins/Temporal/Instant/limits.js
new file mode 100644
index 0000000000..8d9b0cb217
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/limits.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2018 Bloomberg LP. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant
+description: Min/max range.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+
+// constructing from ns
+var limit = 8640000000000000000000n;
+assert.throws(RangeError, () => new Temporal.Instant(-limit - 1n));
+assert.throws(RangeError, () => new Temporal.Instant(limit + 1n));
+TemporalHelpers.assertInstantsEqual(new Temporal.Instant(-limit),
+                                    Temporal.Instant.from("-271821-04-20T00:00:00Z"));
+TemporalHelpers.assertInstantsEqual(new Temporal.Instant(limit),
+                                    Temporal.Instant.from("+275760-09-13T00:00:00Z"));
diff --git a/test/built-ins/Temporal/Instant/prototype/add/cross-epoch.js b/test/built-ins/Temporal/Instant/prototype/add/cross-epoch.js
new file mode 100644
index 0000000000..3d17400390
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/add/cross-epoch.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2018 Bloomberg LP. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal-instant.prototype.add
+description: Cross-epoch arithmetic.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const inst = Temporal.Instant.from("1969-12-25T12:23:45.678901234Z");
+
+// cross epoch in ms
+const one = inst.subtract({
+  hours: 240,
+  nanoseconds: 800
+});
+const two = inst.add({
+  hours: 240,
+  nanoseconds: 800
+});
+const three = two.subtract({
+  hours: 480,
+  nanoseconds: 1600
+});
+const four = one.add({
+  hours: 480,
+  nanoseconds: 1600
+});
+TemporalHelpers.assertInstantsEqual(one, Temporal.Instant.from("1969-12-15T12:23:45.678900434Z"),
+                    `(${ inst }).subtract({ hours: 240, nanoseconds: 800 }) = ${ one }`);
+TemporalHelpers.assertInstantsEqual(two, Temporal.Instant.from("1970-01-04T12:23:45.678902034Z"),
+                    `(${ inst }).add({ hours: 240, nanoseconds: 800 }) = ${ two }`);
+TemporalHelpers.assertInstantsEqual(three, one, `(${ two }).subtract({ hours: 480, nanoseconds: 1600 }) = ${ one }`);
+TemporalHelpers.assertInstantsEqual(four, two, `(${ one }).add({ hours: 480, nanoseconds: 1600 }) = ${ two }`);
diff --git a/test/staging/Temporal/Instant/old/equals.js b/test/built-ins/Temporal/Instant/prototype/equals/cross-epoch.js
similarity index 52%
rename from test/staging/Temporal/Instant/old/equals.js
rename to test/built-ins/Temporal/Instant/prototype/equals/cross-epoch.js
index 0bdbe1b848..49332af510 100644
--- a/test/staging/Temporal/Instant/old/equals.js
+++ b/test/built-ins/Temporal/Instant/prototype/equals/cross-epoch.js
@@ -2,14 +2,14 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.equals works
+esid: sec-temporal.instant.prototype.equals
+description: Temporal.Instant.equals works cross-epoch
 features: [Temporal]
 ---*/
 
-var i1 = Temporal.Instant.from("1963-02-13T09:36:29.123456789Z");
-var i2 = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
-var i3 = Temporal.Instant.from("1981-12-15T14:34:31.987654321Z");
+const i1 = Temporal.Instant.from("1963-02-13T09:36:29.123456789Z");
+const i2 = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const i3 = Temporal.Instant.from("1981-12-15T14:34:31.987654321Z");
 
 // pre epoch equal
 assert(i1.equals(i1))
diff --git a/test/built-ins/Temporal/Instant/prototype/round/accepts-plural-units.js b/test/built-ins/Temporal/Instant/prototype/round/accepts-plural-units.js
new file mode 100644
index 0000000000..24cafd35ee
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/accepts-plural-units.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() accepts plural units.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const inst = new Temporal.Instant(1_000_000_000_123_456_789n);
+
+[
+  "hour",
+  "minute",
+  "second",
+  "millisecond",
+  "microsecond",
+  "nanosecond"
+].forEach(smallestUnit => {
+    TemporalHelpers.assertInstantsEqual(inst.round({ smallestUnit }),
+                                        inst.round({ smallestUnit: `${ smallestUnit }s` }));
+});
diff --git a/test/built-ins/Temporal/Instant/prototype/round/accepts-string-parameter-for-smallestunit.js b/test/built-ins/Temporal/Instant/prototype/round/accepts-string-parameter-for-smallestunit.js
new file mode 100644
index 0000000000..d8a8c4c6f9
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/accepts-string-parameter-for-smallestunit.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() accepts string parameter as shortcut for {smallestUnit}.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const inst = new Temporal.Instant(1_000_000_000_123_456_789n);
+
+[
+  "hour",
+  "minute",
+  "second",
+  "millisecond",
+  "microsecond",
+  "nanosecond"
+].forEach(smallestUnit => {
+    TemporalHelpers.assertInstantsEqual(inst.round(smallestUnit),
+                                        inst.round({ smallestUnit }));
+});
diff --git a/test/built-ins/Temporal/Instant/prototype/round/allow-increments-that-divide-evenly-into-solar-days.js b/test/built-ins/Temporal/Instant/prototype/round/allow-increments-that-divide-evenly-into-solar-days.js
new file mode 100644
index 0000000000..fa73bbc88c
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/allow-increments-that-divide-evenly-into-solar-days.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() allows increments that divide evenly into solar days.
+features: [Temporal]
+---*/
+
+const inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
+
+assert(inst.round({
+    smallestUnit: "second",
+    roundingIncrement: 864
+}) instanceof Temporal.Instant);
diff --git a/test/built-ins/Temporal/Instant/prototype/round/round-to-days.js b/test/built-ins/Temporal/Instant/prototype/round/round-to-days.js
new file mode 100644
index 0000000000..9c2be93f01
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/round-to-days.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: Rounds to days by specifying increments of 86400 seconds in various units
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
+const expected = Temporal.Instant.from("1976-11-19T00:00:00Z");
+
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "hour",
+  roundingIncrement: 24
+}), expected);
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "minute",
+  roundingIncrement: 1440
+}), expected);
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "second",
+  roundingIncrement: 86400
+}), expected);
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "millisecond",
+  roundingIncrement: 86400000
+}), expected);
diff --git a/test/built-ins/Temporal/Instant/prototype/round/rounding-increments.js b/test/built-ins/Temporal/Instant/prototype/round/rounding-increments.js
new file mode 100644
index 0000000000..0314b05737
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/rounding-increments.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() throws without required smallestUnit parameter.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
+
+// rounds to an increment of hours
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "hour",
+  roundingIncrement: 4
+}), Temporal.Instant.from("1976-11-18T16:00:00Z"));
+
+// rounds to an increment of minutes
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "minute",
+  roundingIncrement: 15
+}), Temporal.Instant.from("1976-11-18T14:30:00Z"));
+
+// rounds to an increment of seconds
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "second",
+  roundingIncrement: 30
+}), Temporal.Instant.from("1976-11-18T14:23:30Z"));
+
+// rounds to an increment of milliseconds
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "millisecond",
+  roundingIncrement: 10
+}), Temporal.Instant.from("1976-11-18T14:23:30.12Z"));
+
+// rounds to an increment of microseconds
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "microsecond",
+  roundingIncrement: 10
+}), Temporal.Instant.from("1976-11-18T14:23:30.12346Z"));
+
+// rounds to an increment of nanoseconds
+TemporalHelpers.assertInstantsEqual(inst.round({
+  smallestUnit: "nanosecond",
+  roundingIncrement: 10
+}), Temporal.Instant.from("1976-11-18T14:23:30.12345679Z"));
diff --git a/test/built-ins/Temporal/Instant/prototype/round/throws-on-increments-that-do-not-divide-evenly.js b/test/built-ins/Temporal/Instant/prototype/round/throws-on-increments-that-do-not-divide-evenly.js
new file mode 100644
index 0000000000..785a084547
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/throws-on-increments-that-do-not-divide-evenly.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() throws on increments that do not divide evenly into solar days.
+features: [Temporal]
+---*/
+
+const inst = new Temporal.Instant(0n);
+
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "hour",
+  roundingIncrement: 7
+}));
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "minute",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "second",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "millisecond",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "microsecond",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => inst.round({
+  smallestUnit: "nanosecond",
+  roundingIncrement: 29
+}));
diff --git a/test/built-ins/Temporal/Instant/prototype/round/throws-without-smallest-unit.js b/test/built-ins/Temporal/Instant/prototype/round/throws-without-smallest-unit.js
new file mode 100644
index 0000000000..bec2eb2973
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/round/throws-without-smallest-unit.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.round
+description: round() throws without required smallestUnit parameter.
+features: [Temporal]
+---*/
+
+const inst = new Temporal.Instant(0n);
+
+assert.throws(RangeError, () => inst.round({}));
+assert.throws(RangeError, () => inst.round({
+  roundingIncrement: 1,
+  roundingMode: "ceil"
+}));
diff --git a/test/built-ins/Temporal/Instant/prototype/since/add-subtract.js b/test/built-ins/Temporal/Instant/prototype/since/add-subtract.js
new file mode 100644
index 0000000000..53c74c8638
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/add-subtract.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.instant.prototype.since
+description: since() works.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const diff = later.since(earlier);
+
+TemporalHelpers.assertDurationsEqual(earlier.since(later), diff.negated());
+TemporalHelpers.assertDurationsEqual(earlier.until(later), diff);
+TemporalHelpers.assertInstantsEqual(earlier.add(diff), later);
+TemporalHelpers.assertInstantsEqual(later.subtract(diff), earlier);
diff --git a/test/built-ins/Temporal/Instant/prototype/since/invalid-increments.js b/test/built-ins/Temporal/Instant/prototype/since/invalid-increments.js
new file mode 100644
index 0000000000..93d0379d90
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/invalid-increments.js
@@ -0,0 +1,77 @@
+
+// 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: Test invalid increments.
+features: [Temporal]
+---*/
+
+const earlier = new Temporal.Instant(0n);
+const later = new Temporal.Instant(1_000_000_000_000_000_000n);
+const largestUnit = "hours";
+
+// throws on increments that do not divide evenly into the next highest
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 11
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 29
+}));
+
+// throws on increments that are equal to the next highest
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 24
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 60
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 60
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 1000
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 1000
+}));
+assert.throws(RangeError, () => later.since(earlier, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 1000
+}));
diff --git a/test/built-ins/Temporal/Instant/prototype/since/largest-unit-default.js b/test/built-ins/Temporal/Instant/prototype/since/largest-unit-default.js
new file mode 100644
index 0000000000..88649032c2
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/largest-unit-default.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.instant.prototype.since
+description: Assumes a different default for largestUnit if smallestUnit is larger than seconds.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+
+TemporalHelpers.assertDuration(later.since(earlier, {
+  smallestUnit: "hours",
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 0, 0, 0, 0, 0);
+TemporalHelpers.assertDuration(later.since(earlier, {
+  smallestUnit: "minutes",
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 0, 22586123, 0, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/since/minutes-and-hours.js b/test/built-ins/Temporal/Instant/prototype/since/minutes-and-hours.js
new file mode 100644
index 0000000000..f2f655ad12
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/minutes-and-hours.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.instant.prototype.since
+description: since() can return minutes and hours.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+const feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
+
+// can return minutes and hours
+TemporalHelpers.assertDuration(feb21.since(feb20, { largestUnit: "hours" }),
+                                     0, 0, 0, 0, 8784, 0, 0, 0, 0, 0);
+TemporalHelpers.assertDuration(feb21.since(feb20, { largestUnit: "minutes" }),
+                                     0, 0, 0, 0, 0, 527040, 0, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/since/options-may-be-function.js b/test/built-ins/Temporal/Instant/prototype/since/options-may-be-function.js
new file mode 100644
index 0000000000..e629aa1d5b
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/options-may-be-function.js
@@ -0,0 +1,15 @@
+// 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: Options may be a function object.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+const feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
+
+TemporalHelpers.assertDuration(feb21.since(feb20, () => {}),
+                                     0, 0, 0, 0, 0, 0, 31622400, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/since/rounding-increments.js b/test/built-ins/Temporal/Instant/prototype/since/rounding-increments.js
new file mode 100644
index 0000000000..02285483e6
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/rounding-increments.js
@@ -0,0 +1,62 @@
+// 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: Test different rounding increments.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const largestUnit = "hours";
+
+// rounds to an increment of hours
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 3,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376434, 0, 0, 0, 0, 0);
+
+// rounds to an increment of minutes
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 30,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 30, 0, 0, 0, 0);
+
+// rounds to an increment of seconds
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 15,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 23, 15, 0, 0, 0);
+
+// rounds to an increment of milliseconds
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 23, 8, 150, 0, 0);
+
+// rounds to an increment of microseconds
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 23, 8, 148, 530, 0);
+
+// rounds to an increment of nanoseconds
+TemporalHelpers.assertDuration(later.since(earlier, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 376435, 23, 8, 148, 529, 310);
+
diff --git a/test/built-ins/Temporal/Instant/prototype/since/subseconds.js b/test/built-ins/Temporal/Instant/prototype/since/subseconds.js
new file mode 100644
index 0000000000..f6348059b9
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/subseconds.js
@@ -0,0 +1,30 @@
+// 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: since() can return subseconds.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+
+const latersub = feb20.add({
+  hours: 24,
+  milliseconds: 250,
+  microseconds: 250,
+  nanoseconds: 250
+});
+
+const msDiff = latersub.since(feb20, { largestUnit: "milliseconds" });
+TemporalHelpers.assertDuration(msDiff,
+                               0, 0, 0, 0, 0, 0, 0, 86400250, 250, 250);
+
+const µsDiff = latersub.since(feb20, { largestUnit: "microseconds" });
+TemporalHelpers.assertDuration(µsDiff,
+                               0, 0, 0, 0, 0, 0, 0, 0, 86400250250, 250);
+
+const nsDiff = latersub.since(feb20, { largestUnit: "nanoseconds" });
+TemporalHelpers.assertDuration(nsDiff,
+                               0, 0, 0, 0, 0, 0, 0, 0, 0, 86400250250250);
diff --git a/test/built-ins/Temporal/Instant/prototype/since/valid-increments.js b/test/built-ins/Temporal/Instant/prototype/since/valid-increments.js
new file mode 100644
index 0000000000..c4729f2524
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/since/valid-increments.js
@@ -0,0 +1,89 @@
+// 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: Test valid increments.
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const largestUnit = "hours";
+
+[
+  1,
+  2,
+  3,
+  4,
+  6,
+  8,
+  12
+].forEach(roundingIncrement => {
+  const options = {
+    largestUnit,
+    smallestUnit: "hours",
+    roundingIncrement
+  };
+  assert(later.since(earlier, options) instanceof Temporal.Duration);
+});
+
+// valid increments divide into 60
+[
+  "minutes",
+  "seconds"
+].forEach(smallestUnit => {
+  [
+    1,
+    2,
+    3,
+    4,
+    5,
+    6,
+    10,
+    12,
+    15,
+    20,
+    30
+  ].forEach(roundingIncrement => {
+    const options = {
+      largestUnit,
+      smallestUnit,
+      roundingIncrement
+    };
+    assert(later.since(earlier, options) instanceof Temporal.Duration);
+  });
+});
+
+// valid increments divide into 1000
+[
+  "milliseconds",
+  "microseconds",
+  "nanoseconds"
+].forEach(smallestUnit => {
+  [
+    1,
+    2,
+    4,
+    5,
+    8,
+    10,
+    20,
+    25,
+    40,
+    50,
+    100,
+    125,
+    200,
+    250,
+    500
+  ].forEach(roundingIncrement => {
+    const options = {
+      largestUnit,
+      smallestUnit,
+      roundingIncrement
+    };
+    assert(later.since(earlier, options) instanceof Temporal.Duration);
+  });
+});
+
diff --git a/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/timezone-missing.js b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/timezone-missing.js
new file mode 100644
index 0000000000..f03b8c0b5b
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/timezone-missing.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.instant.prototype.tozoneddatetimeiso
+description: toZonedDateTimeISO() throws without parameter.
+features: [Temporal]
+---*/
+
+const inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
+
+assert.throws(TypeError, () => inst.toZonedDateTimeISO());
diff --git a/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/to-zoned-date-time-iso.js b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/to-zoned-date-time-iso.js
new file mode 100644
index 0000000000..8e0c6beaaf
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toZonedDateTimeISO/to-zoned-date-time-iso.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.instant.prototype.tozoneddatetimeiso
+description: Test time zone parameters.
+features: [Temporal]
+---*/
+
+const inst = new Temporal.Instant(1_000_000_000_000_000_000n);
+
+// time zone parameter UTC
+const zdt = inst.toZonedDateTimeISO("UTC");
+assert.sameValue(inst.epochNanoseconds, zdt.epochNanoseconds);
+assert.sameValue(zdt.timeZoneId, "UTC");
+
+// time zone parameter non-UTC
+const zdtNonUTC = inst.toZonedDateTimeISO("-05:00");
+assert.sameValue(inst.epochNanoseconds, zdtNonUTC.epochNanoseconds);
+assert.sameValue(zdtNonUTC.timeZoneId, "-05:00");
diff --git a/test/built-ins/Temporal/Instant/prototype/until/add-subtract.js b/test/built-ins/Temporal/Instant/prototype/until/add-subtract.js
new file mode 100644
index 0000000000..8e4e5fd936
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/add-subtract.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 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: until() works.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const diff = earlier.until(later);
+
+TemporalHelpers.assertDurationsEqual(later.until(earlier), diff.negated());
+TemporalHelpers.assertDurationsEqual(later.since(earlier), diff);
+TemporalHelpers.assertInstantsEqual(earlier.add(diff), later);
+TemporalHelpers.assertInstantsEqual(later.subtract(diff), earlier);
+
diff --git a/test/built-ins/Temporal/Instant/prototype/until/invalid-increments.js b/test/built-ins/Temporal/Instant/prototype/until/invalid-increments.js
new file mode 100644
index 0000000000..1d776a7c2e
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/invalid-increments.js
@@ -0,0 +1,76 @@
+// Copyright (C) 2021 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: Test various rounding increments.
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const largestUnit = "hours";
+
+// throws on increments that do not divide evenly into the next highest
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 11
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 29
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 29
+}));
+
+// throws on increments that are equal to the next highest
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 24
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 60
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 60
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 1000
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 1000
+}));
+assert.throws(RangeError, () => earlier.until(later, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 1000
+}));
diff --git a/test/built-ins/Temporal/Instant/prototype/until/largestunit-default.js b/test/built-ins/Temporal/Instant/prototype/until/largestunit-default.js
new file mode 100644
index 0000000000..245bf95ec9
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/largestunit-default.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2021 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: Assumes a different default for largestUnit if smallestUnit is larger than seconds.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+
+TemporalHelpers.assertDuration(earlier.until(later, {
+  smallestUnit: "hours",
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440610, 0, 0, 0, 0, 0);
+TemporalHelpers.assertDuration(earlier.until(later, {
+  smallestUnit: "minutes",
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 0, 26436596, 0, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/until/minutes-and-hours.js b/test/built-ins/Temporal/Instant/prototype/until/minutes-and-hours.js
new file mode 100644
index 0000000000..97652ec85c
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/minutes-and-hours.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2021 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: Can return minutes and hours.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+const feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
+
+TemporalHelpers.assertDuration(feb20.until(feb21, { largestUnit: "hours" }),
+                               0, 0, 0, 0, 8784, 0, 0, 0, 0, 0);
+TemporalHelpers.assertDuration(feb20.until(feb21, { largestUnit: "minutes" }),
+                               0, 0, 0, 0, 0, 527040, 0, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/until/options-may-be-function.js b/test/built-ins/Temporal/Instant/prototype/until/options-may-be-function.js
new file mode 100644
index 0000000000..7b104a2ff0
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/options-may-be-function.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 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: Options may be a function object.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+const feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
+
+TemporalHelpers.assertDuration(feb20.until(feb21, () => {}),
+                               0, 0, 0, 0, 0, 0, 31622400, 0, 0, 0);
diff --git a/test/built-ins/Temporal/Instant/prototype/until/rounding-increments.js b/test/built-ins/Temporal/Instant/prototype/until/rounding-increments.js
new file mode 100644
index 0000000000..57d50d9263
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/rounding-increments.js
@@ -0,0 +1,62 @@
+// Copyright (C) 2021 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: Test various rounding increments.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const largestUnit = "hours";
+
+// rounds to an increment of hours
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "hours",
+  roundingIncrement: 4,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440608, 0, 0, 0, 0, 0);
+
+// rounds to an increment of minutes
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "minutes",
+  roundingIncrement: 30,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440610, 0, 0, 0, 0, 0);
+
+// rounds to an increment of seconds
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "seconds",
+  roundingIncrement: 15,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440609, 56, 0, 0, 0, 0);
+
+// rounds to an increment of milliseconds
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "milliseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440609, 56, 3, 150, 0, 0);
+
+// rounds to an increment of microseconds
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "microseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440609, 56, 3, 148, 530, 0);
+
+// rounds to an increment of nanoseconds
+TemporalHelpers.assertDuration(earlier.until(later, {
+  largestUnit,
+  smallestUnit: "nanoseconds",
+  roundingIncrement: 10,
+  roundingMode: "halfExpand"
+}), 0, 0, 0, 0, 440609, 56, 3, 148, 529, 310);
+
diff --git a/test/built-ins/Temporal/Instant/prototype/until/subseconds.js b/test/built-ins/Temporal/Instant/prototype/until/subseconds.js
new file mode 100644
index 0000000000..928727b482
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/subseconds.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2021 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: Can return subseconds.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
+const feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
+
+const latersub = feb20.add({
+  hours: 24,
+  milliseconds: 250,
+  microseconds: 250,
+  nanoseconds: 250
+});
+const msDiff = feb20.until(latersub, { largestUnit: "milliseconds" });
+TemporalHelpers.assertDuration(msDiff,
+                               0, 0, 0, 0, 0, 0, 0, 86400250, 250, 250);
+
+const µsDiff = feb20.until(latersub, { largestUnit: "microseconds" });
+TemporalHelpers.assertDuration(µsDiff,
+                               0, 0, 0, 0, 0, 0, 0, 0, 86400250250, 250);
+
+const nsDiff = feb20.until(latersub, { largestUnit: "nanoseconds" });
+TemporalHelpers.assertDuration(nsDiff,
+                               0, 0, 0, 0, 0, 0, 0, 0, 0, 86400250250250);
+
diff --git a/test/built-ins/Temporal/Instant/prototype/until/valid-increments.js b/test/built-ins/Temporal/Instant/prototype/until/valid-increments.js
new file mode 100644
index 0000000000..c6901705b8
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/until/valid-increments.js
@@ -0,0 +1,89 @@
+// Copyright (C) 2021 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: Test various rounding increments.
+features: [Temporal]
+---*/
+
+const earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
+const later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
+const largestUnit = "hours";
+
+// valid hour increments divide into 24
+[
+  1,
+  2,
+  3,
+  4,
+  6,
+  8,
+  12
+].forEach(roundingIncrement => {
+  const options = {
+    largestUnit,
+    smallestUnit: "hours",
+    roundingIncrement
+  };
+  assert(earlier.until(later, options) instanceof Temporal.Duration);
+});
+
+// valid increments divide into 60
+[
+  "minutes",
+  "seconds"
+].forEach(smallestUnit => {
+  [
+    1,
+    2,
+    3,
+    4,
+    5,
+    6,
+    10,
+    12,
+    15,
+    20,
+    30
+  ].forEach(roundingIncrement => {
+    const options = {
+      largestUnit,
+      smallestUnit,
+      roundingIncrement
+    };
+    assert(earlier.until(later, options) instanceof Temporal.Duration);
+  });
+});
+
+// valid increments divide into 1000
+[
+  "milliseconds",
+  "microseconds",
+  "nanoseconds"
+].forEach(smallestUnit => {
+  [
+    1,
+    2,
+    4,
+    5,
+    8,
+    10,
+    20,
+    25,
+    40,
+    50,
+    100,
+    125,
+    200,
+    250,
+    500
+  ].forEach(roundingIncrement => {
+    const options = {
+      largestUnit,
+      smallestUnit,
+      roundingIncrement
+    };
+    assert(earlier.until(later, options) instanceof Temporal.Duration);
+  });
+});
diff --git a/test/staging/Temporal/Instant/old/add.js b/test/staging/Temporal/Instant/old/add.js
deleted file mode 100644
index 0141f4af6c..0000000000
--- a/test/staging/Temporal/Instant/old/add.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.add works
-features: [Temporal]
----*/
-
-var inst = Temporal.Instant.from("1969-12-25T12:23:45.678901234Z");
-
-// cross epoch in ms
-var one = inst.subtract({
-  hours: 240,
-  nanoseconds: 800
-});
-var two = inst.add({
-  hours: 240,
-  nanoseconds: 800
-});
-var three = two.subtract({
-  hours: 480,
-  nanoseconds: 1600
-});
-var four = one.add({
-  hours: 480,
-  nanoseconds: 1600
-});
-assert.sameValue(`${ one }`, "1969-12-15T12:23:45.678900434Z", `(${ inst }).subtract({ hours: 240, nanoseconds: 800 }) = ${ one }`);
-assert.sameValue(`${ two }`, "1970-01-04T12:23:45.678902034Z", `(${ inst }).add({ hours: 240, nanoseconds: 800 }) = ${ two }`);
-assert(three.equals(one), `(${ two }).subtract({ hours: 480, nanoseconds: 1600 }) = ${ one }`);
-assert(four.equals(two), `(${ one }).add({ hours: 480, nanoseconds: 1600 }) = ${ two }`);
diff --git a/test/staging/Temporal/Instant/old/limits.js b/test/staging/Temporal/Instant/old/limits.js
deleted file mode 100644
index d7818426a0..0000000000
--- a/test/staging/Temporal/Instant/old/limits.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Min/max range
-features: [Temporal]
----*/
-
-
-// constructing from ns
-var limit = 8640000000000000000000n;
-assert.throws(RangeError, () => new Temporal.Instant(-limit - 1n));
-assert.throws(RangeError, () => new Temporal.Instant(limit + 1n));
-assert.sameValue(`${ new Temporal.Instant(-limit) }`, "-271821-04-20T00:00:00Z");
-assert.sameValue(`${ new Temporal.Instant(limit) }`, "+275760-09-13T00:00:00Z");
-
-// constructing from ms
-var limit = 8640000000000000;
-assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(-limit - 1));
-assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(limit + 1));
-assert.sameValue(`${ Temporal.Instant.fromEpochMilliseconds(-limit) }`, "-271821-04-20T00:00:00Z");
-assert.sameValue(`${ Temporal.Instant.fromEpochMilliseconds(limit) }`, "+275760-09-13T00:00:00Z");
diff --git a/test/staging/Temporal/Instant/old/round.js b/test/staging/Temporal/Instant/old/round.js
deleted file mode 100644
index 01b88205dc..0000000000
--- a/test/staging/Temporal/Instant/old/round.js
+++ /dev/null
@@ -1,128 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.round works
-features: [Temporal]
----*/
-
-var inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
-
-// throws without required smallestUnit parameter
-assert.throws(RangeError, () => inst.round({}));
-assert.throws(RangeError, () => inst.round({
-  roundingIncrement: 1,
-  roundingMode: "ceil"
-}));
-
-// rounds to an increment of hours
-assert.sameValue(`${ inst.round({
-  smallestUnit: "hour",
-  roundingIncrement: 4
-}) }`, "1976-11-18T16:00:00Z");
-
-// rounds to an increment of minutes
-assert.sameValue(`${ inst.round({
-  smallestUnit: "minute",
-  roundingIncrement: 15
-}) }`, "1976-11-18T14:30:00Z");
-
-// rounds to an increment of seconds
-assert.sameValue(`${ inst.round({
-  smallestUnit: "second",
-  roundingIncrement: 30
-}) }`, "1976-11-18T14:23:30Z");
-
-// rounds to an increment of milliseconds
-assert.sameValue(`${ inst.round({
-  smallestUnit: "millisecond",
-  roundingIncrement: 10
-}) }`, "1976-11-18T14:23:30.12Z");
-
-// rounds to an increment of microseconds
-assert.sameValue(`${ inst.round({
-  smallestUnit: "microsecond",
-  roundingIncrement: 10
-}) }`, "1976-11-18T14:23:30.12346Z");
-
-// rounds to an increment of nanoseconds
-assert.sameValue(`${ inst.round({
-  smallestUnit: "nanosecond",
-  roundingIncrement: 10
-}) }`, "1976-11-18T14:23:30.12345679Z");
-
-// rounds to days by specifying increment of 86400 seconds in various units
-var expected = "1976-11-19T00:00:00Z";
-assert.sameValue(`${ inst.round({
-  smallestUnit: "hour",
-  roundingIncrement: 24
-}) }`, expected);
-assert.sameValue(`${ inst.round({
-  smallestUnit: "minute",
-  roundingIncrement: 1440
-}) }`, expected);
-assert.sameValue(`${ inst.round({
-  smallestUnit: "second",
-  roundingIncrement: 86400
-}) }`, expected);
-assert.sameValue(`${ inst.round({
-  smallestUnit: "millisecond",
-  roundingIncrement: 86400000
-}) }`, expected);
-
-// allows increments that divide evenly into solar days
-assert(inst.round({
-  smallestUnit: "second",
-  roundingIncrement: 864
-}) instanceof Temporal.Instant);
-
-// throws on increments that do not divide evenly into solar days
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "hour",
-  roundingIncrement: 7
-}));
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "minute",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "second",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "millisecond",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "microsecond",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => inst.round({
-  smallestUnit: "nanosecond",
-  roundingIncrement: 29
-}));
-
-// accepts plural units
-[
-  "hour",
-  "minute",
-  "second",
-  "millisecond",
-  "microsecond",
-  "nanosecond"
-].forEach(smallestUnit => {
-  assert(inst.round({ smallestUnit }).equals(inst.round({ smallestUnit: `${ smallestUnit }s` })));
-});
-
-// accepts string parameter as shortcut for {smallestUnit}
-[
-  "hour",
-  "minute",
-  "second",
-  "millisecond",
-  "microsecond",
-  "nanosecond"
-].forEach(smallestUnit => {
-  assert(inst.round(smallestUnit).equals(inst.round({ smallestUnit })));
-});
diff --git a/test/staging/Temporal/Instant/old/since.js b/test/staging/Temporal/Instant/old/since.js
deleted file mode 100644
index fa9773de9a..0000000000
--- a/test/staging/Temporal/Instant/old/since.js
+++ /dev/null
@@ -1,246 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.since() works
-features: [Temporal]
----*/
-
-var earlier = Temporal.Instant.from("1976-11-18T15:23:30.123456789Z");
-var later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
-var diff = later.since(earlier);
-assert.sameValue(`${ earlier.since(later) }`, `${ diff.negated() }`)
-assert.sameValue(`${ earlier.until(later) }`, `${ diff }`)
-assert(earlier.add(diff).equals(later))
-assert(later.subtract(diff).equals(earlier))
-var feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
-var feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
-
-// can return minutes and hours
-assert.sameValue(`${ feb21.since(feb20, { largestUnit: "hours" }) }`, "PT8784H");
-assert.sameValue(`${ feb21.since(feb20, { largestUnit: "minutes" }) }`, "PT527040M");
-
-// can return subseconds
-var latersub = feb20.add({
-  hours: 24,
-  milliseconds: 250,
-  microseconds: 250,
-  nanoseconds: 250
-});
-var msDiff = latersub.since(feb20, { largestUnit: "milliseconds" });
-assert.sameValue(msDiff.seconds, 0);
-assert.sameValue(msDiff.milliseconds, 86400250);
-assert.sameValue(msDiff.microseconds, 250);
-assert.sameValue(msDiff.nanoseconds, 250);
-var µsDiff = latersub.since(feb20, { largestUnit: "microseconds" });
-assert.sameValue(µsDiff.milliseconds, 0);
-assert.sameValue(µsDiff.microseconds, 86400250250);
-assert.sameValue(µsDiff.nanoseconds, 250);
-var nsDiff = latersub.since(feb20, { largestUnit: "nanoseconds" });
-assert.sameValue(nsDiff.microseconds, 0);
-assert.sameValue(nsDiff.nanoseconds, 86400250250250);
-
-// options may be a function object
-assert.sameValue(`${ feb21.since(feb20, () => {
-}) }`, "PT31622400S");
-
-// assumes a different default for largestUnit if smallestUnit is larger than seconds
-assert.sameValue(`${ later.since(earlier, {
-  smallestUnit: "hours",
-  roundingMode: "halfExpand"
-}) }`, "PT376435H");
-assert.sameValue(`${ later.since(earlier, {
-  smallestUnit: "minutes",
-  roundingMode: "halfExpand"
-}) }`, "PT22586123M");
-var largestUnit = "hours";
-
-// rounds to an increment of hours
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 3,
-  roundingMode: "halfExpand"
-}) }`, "PT376434H");
-
-// rounds to an increment of minutes
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 30,
-  roundingMode: "halfExpand"
-}) }`, "PT376435H30M");
-
-// rounds to an increment of seconds
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 15,
-  roundingMode: "halfExpand"
-}) }`, "PT376435H23M15S");
-
-// rounds to an increment of milliseconds
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT376435H23M8.15S");
-
-// rounds to an increment of microseconds
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT376435H23M8.14853S");
-
-// rounds to an increment of nanoseconds
-assert.sameValue(`${ later.since(earlier, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT376435H23M8.14852931S");
-
-// valid hour increments divide into 24
-[
-  1,
-  2,
-  3,
-  4,
-  6,
-  8,
-  12
-].forEach(roundingIncrement => {
-  var options = {
-    largestUnit,
-    smallestUnit: "hours",
-    roundingIncrement
-  };
-  assert(later.since(earlier, options) instanceof Temporal.Duration);
-});
-
-// valid increments divide into 60
-[
-  "minutes",
-  "seconds"
-].forEach(smallestUnit => {
-  [
-    1,
-    2,
-    3,
-    4,
-    5,
-    6,
-    10,
-    12,
-    15,
-    20,
-    30
-  ].forEach(roundingIncrement => {
-    var options = {
-      largestUnit,
-      smallestUnit,
-      roundingIncrement
-    };
-    assert(later.since(earlier, options) instanceof Temporal.Duration);
-  });
-});
-
-// valid increments divide into 1000
-[
-  "milliseconds",
-  "microseconds",
-  "nanoseconds"
-].forEach(smallestUnit => {
-  [
-    1,
-    2,
-    4,
-    5,
-    8,
-    10,
-    20,
-    25,
-    40,
-    50,
-    100,
-    125,
-    200,
-    250,
-    500
-  ].forEach(roundingIncrement => {
-    var options = {
-      largestUnit,
-      smallestUnit,
-      roundingIncrement
-    };
-    assert(later.since(earlier, options) instanceof Temporal.Duration);
-  });
-});
-
-// throws on increments that do not divide evenly into the next highest
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 11
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 29
-}));
-
-// throws on increments that are equal to the next highest
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 24
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 60
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 60
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 1000
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 1000
-}));
-assert.throws(RangeError, () => later.since(earlier, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 1000
-}));
diff --git a/test/staging/Temporal/Instant/old/toZonedDateTimeISO.js b/test/staging/Temporal/Instant/old/toZonedDateTimeISO.js
deleted file mode 100644
index 6f50c10771..0000000000
--- a/test/staging/Temporal/Instant/old/toZonedDateTimeISO.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.toZonedDateTimeISO() works
-features: [Temporal]
----*/
-
-var inst = Temporal.Instant.from("1976-11-18T14:23:30.123456789Z");
-
-// throws without parameter
-assert.throws(TypeError, () => inst.toZonedDateTimeISO());
-
-// time zone parameter UTC
-var zdt = inst.toZonedDateTimeISO("UTC");
-assert.sameValue(inst.epochNanoseconds, zdt.epochNanoseconds);
-assert.sameValue(`${ zdt }`, "1976-11-18T14:23:30.123456789+00:00[UTC]");
-
-// time zone parameter non-UTC
-var zdt = inst.toZonedDateTimeISO("-05:00");
-assert.sameValue(inst.epochNanoseconds, zdt.epochNanoseconds);
-assert.sameValue(`${ zdt }`, "1976-11-18T09:23:30.123456789-05:00[-05:00]");
diff --git a/test/staging/Temporal/Instant/old/until.js b/test/staging/Temporal/Instant/old/until.js
deleted file mode 100644
index 3c4c33ad31..0000000000
--- a/test/staging/Temporal/Instant/old/until.js
+++ /dev/null
@@ -1,246 +0,0 @@
-// Copyright (C) 2018 Bloomberg LP. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-instant-objects
-description: Temporal.Instant.until() works
-features: [Temporal]
----*/
-
-var earlier = Temporal.Instant.from("1969-07-24T16:50:35.123456789Z");
-var later = Temporal.Instant.from("2019-10-29T10:46:38.271986102Z");
-var diff = earlier.until(later);
-assert.sameValue(`${ later.until(earlier) }`, `${ diff.negated() }`)
-assert.sameValue(`${ later.since(earlier) }`, `${ diff }`)
-assert(earlier.add(diff).equals(later))
-assert(later.subtract(diff).equals(earlier))
-var feb20 = Temporal.Instant.from("2020-02-01T00:00Z");
-var feb21 = Temporal.Instant.from("2021-02-01T00:00Z");
-
-// can return minutes and hours
-assert.sameValue(`${ feb20.until(feb21, { largestUnit: "hours" }) }`, "PT8784H");
-assert.sameValue(`${ feb20.until(feb21, { largestUnit: "minutes" }) }`, "PT527040M");
-
-// can return subseconds
-var latersub = feb20.add({
-  hours: 24,
-  milliseconds: 250,
-  microseconds: 250,
-  nanoseconds: 250
-});
-var msDiff = feb20.until(latersub, { largestUnit: "milliseconds" });
-assert.sameValue(msDiff.seconds, 0);
-assert.sameValue(msDiff.milliseconds, 86400250);
-assert.sameValue(msDiff.microseconds, 250);
-assert.sameValue(msDiff.nanoseconds, 250);
-var µsDiff = feb20.until(latersub, { largestUnit: "microseconds" });
-assert.sameValue(µsDiff.milliseconds, 0);
-assert.sameValue(µsDiff.microseconds, 86400250250);
-assert.sameValue(µsDiff.nanoseconds, 250);
-var nsDiff = feb20.until(latersub, { largestUnit: "nanoseconds" });
-assert.sameValue(nsDiff.microseconds, 0);
-assert.sameValue(nsDiff.nanoseconds, 86400250250250);
-
-// options may be a function object
-assert.sameValue(`${ feb20.until(feb21, () => {
-}) }`, "PT31622400S");
-
-// assumes a different default for largestUnit if smallestUnit is larger than seconds
-assert.sameValue(`${ earlier.until(later, {
-  smallestUnit: "hours",
-  roundingMode: "halfExpand"
-}) }`, "PT440610H");
-assert.sameValue(`${ earlier.until(later, {
-  smallestUnit: "minutes",
-  roundingMode: "halfExpand"
-}) }`, "PT26436596M");
-var largestUnit = "hours";
-
-// rounds to an increment of hours
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 4,
-  roundingMode: "halfExpand"
-}) }`, "PT440608H");
-
-// rounds to an increment of minutes
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 30,
-  roundingMode: "halfExpand"
-}) }`, "PT440610H");
-
-// rounds to an increment of seconds
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 15,
-  roundingMode: "halfExpand"
-}) }`, "PT440609H56M");
-
-// rounds to an increment of milliseconds
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT440609H56M3.15S");
-
-// rounds to an increment of microseconds
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT440609H56M3.14853S");
-
-// rounds to an increment of nanoseconds
-assert.sameValue(`${ earlier.until(later, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 10,
-  roundingMode: "halfExpand"
-}) }`, "PT440609H56M3.14852931S");
-
-// valid hour increments divide into 24
-[
-  1,
-  2,
-  3,
-  4,
-  6,
-  8,
-  12
-].forEach(roundingIncrement => {
-  var options = {
-    largestUnit,
-    smallestUnit: "hours",
-    roundingIncrement
-  };
-  assert(earlier.until(later, options) instanceof Temporal.Duration);
-});
-
-// valid increments divide into 60
-[
-  "minutes",
-  "seconds"
-].forEach(smallestUnit => {
-  [
-    1,
-    2,
-    3,
-    4,
-    5,
-    6,
-    10,
-    12,
-    15,
-    20,
-    30
-  ].forEach(roundingIncrement => {
-    var options = {
-      largestUnit,
-      smallestUnit,
-      roundingIncrement
-    };
-    assert(earlier.until(later, options) instanceof Temporal.Duration);
-  });
-});
-
-// valid increments divide into 1000
-[
-  "milliseconds",
-  "microseconds",
-  "nanoseconds"
-].forEach(smallestUnit => {
-  [
-    1,
-    2,
-    4,
-    5,
-    8,
-    10,
-    20,
-    25,
-    40,
-    50,
-    100,
-    125,
-    200,
-    250,
-    500
-  ].forEach(roundingIncrement => {
-    var options = {
-      largestUnit,
-      smallestUnit,
-      roundingIncrement
-    };
-    assert(earlier.until(later, options) instanceof Temporal.Duration);
-  });
-});
-
-// throws on increments that do not divide evenly into the next highest
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 11
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 29
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 29
-}));
-
-// throws on increments that are equal to the next highest
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "hours",
-  roundingIncrement: 24
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "minutes",
-  roundingIncrement: 60
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "seconds",
-  roundingIncrement: 60
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "milliseconds",
-  roundingIncrement: 1000
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "microseconds",
-  roundingIncrement: 1000
-}));
-assert.throws(RangeError, () => earlier.until(later, {
-  largestUnit,
-  smallestUnit: "nanoseconds",
-  roundingIncrement: 1000
-}));