diff --git a/test/built-ins/Temporal/Calendar/prototype/day/date-time.js b/test/built-ins/Temporal/Calendar/prototype/day/date-time.js
new file mode 100644
index 00000000000..63e60caff48
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/date-time.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day will take PlainDateTime and return
+  the value of the day.
+info: |
+  5. Return ! ISODay(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let dateTime = new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)
+assert.sameValue(23, cal.day(dateTime));
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/date.js b/test/built-ins/Temporal/Calendar/prototype/day/date.js
new file mode 100644
index 00000000000..fa93e7a34ac
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/date.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day will take PlainDate and return
+  the value of the day.
+info: |
+  5. Return ! ISODay(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let date = new Temporal.PlainDate(2021, 7, 15);
+assert.sameValue(15, cal.day(date));
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/month-day.js b/test/built-ins/Temporal/Calendar/prototype/day/month-day.js
new file mode 100644
index 00000000000..8e90d294728
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/month-day.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day will take PlainMonthDay and return
+  the value of the day.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal
+    slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISODay(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let monthDay = new Temporal.PlainMonthDay(7, 15);
+assert.sameValue(15, cal.day(monthDay));
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/string.js b/test/built-ins/Temporal/Calendar/prototype/day/string.js
new file mode 100644
index 00000000000..2aff7684cfe
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/string.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day will take ISO8601 string and return
+  the value of the day.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal
+    slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISODay(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(15, cal.day("2019-03-15"));
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/throw-range-error-ToTemporalDate.js b/test/built-ins/Temporal/Calendar/prototype/day/throw-range-error-ToTemporalDate.js
new file mode 100644
index 00000000000..91ab2b41821
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/throw-range-error-ToTemporalDate.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day throws RangeError on
+  ToTemporalDate when temporalDateLike is invalid string.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike
+     does not have an [[InitializedTemporalDate]] or
+     [[InitializedTemporalYearMonth]] internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.throws(RangeError, () => cal.day("invalid string"),
+    "Throw RangeError if temporalDateLike is invalid");
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/throw-type-error-RequireInternalSlot.js b/test/built-ins/Temporal/Calendar/prototype/day/throw-type-error-RequireInternalSlot.js
new file mode 100644
index 00000000000..8a57475f616
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/throw-type-error-RequireInternalSlot.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: Temporal.Calendar.prototype.day throws TypeError on RequireInternalSlot if object has no internal slot.
+info: |
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let badCal = { day: cal.day }
+assert.throws(TypeError, () => badCal.day("2021-03-04"),
+    "Throw TypeError if there are no internal slot");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/date-time.js b/test/built-ins/Temporal/Calendar/prototype/month/date-time.js
new file mode 100644
index 00000000000..a2374317e24
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/date-time.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will take PlainDateTime and return
+  the value of the month.
+info: |
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]]
+    internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let dateTime = new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)
+assert.sameValue(8, cal.month(dateTime));
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/date.js b/test/built-ins/Temporal/Calendar/prototype/month/date.js
new file mode 100644
index 00000000000..0fda0dd126a
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/date.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will take PlainDate and return
+  the value of the month.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is Object and temporalDateLike has an
+    [[InitializedTemporalMonthDay]] internal slot, then
+    a. Throw a TypeError exception.
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]]
+    internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let date = new Temporal.PlainDate(2021, 7, 15);
+assert.sameValue(7, cal.month(date));
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/month-day-throw-type-error.js b/test/built-ins/Temporal/Calendar/prototype/month/month-day-throw-type-error.js
new file mode 100644
index 00000000000..0363a7f07a4
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/month-day-throw-type-error.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month throws TypeError if temporalDateLike
+  is a PlainMonthDay object.
+  ToTemporalDate when temporalDateLike is invalid string.
+info: |
+  4. If Type(temporalDateLike) is Object and temporalDateLike has an
+    [[InitializedTemporalMonthDay]] internal slot, then
+    a. Throw a TypeError exception.
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let monthDay = new Temporal.PlainMonthDay(12, 25);
+assert.throws(TypeError, () => cal.month(monthDay),
+    "Throw TypeError if temporalDateLike is a PlainMonthDay");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/string.js b/test/built-ins/Temporal/Calendar/prototype/month/string.js
new file mode 100644
index 00000000000..16ac2134401
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/string.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will take ISO8601 string and return
+  the value of the month.
+info: |
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal
+    slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(3, cal.month("2019-03-15"));
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/throw-range-error-ToTemporalDate.js b/test/built-ins/Temporal/Calendar/prototype/month/throw-range-error-ToTemporalDate.js
new file mode 100644
index 00000000000..9e173c4675e
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/throw-range-error-ToTemporalDate.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month throws RangeError on
+  ToTemporalDate when temporalDateLike is invalid string.
+info: |
+  5. If Type(temporalDateLike) is not Object or temporalDateLike
+     does not have an [[InitializedTemporalDate]] or
+     [[InitializedTemporalYearMonth]] internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.throws(RangeError, () => cal.month("invalid string"),
+    "Throw RangeError if temporalDateLike is invalid");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/throw-type-error-RequireInternalSlot.js b/test/built-ins/Temporal/Calendar/prototype/month/throw-type-error-RequireInternalSlot.js
new file mode 100644
index 00000000000..9b936d8f706
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/throw-type-error-RequireInternalSlot.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month throws TypeError on RequireInternalSlot if object has no internal slot.
+info: |
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let badCal = { month: cal.month }
+assert.throws(TypeError, () => badCal.month("2021-03-04"),
+    "Throw TypeError if there are no internal slot");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/year-month.js b/test/built-ins/Temporal/Calendar/prototype/month/year-month.js
new file mode 100644
index 00000000000..c9811be36cf
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/year-month.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will take PlainYearMonth and return
+  the value of the month.
+info: |
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let yearMonth = new Temporal.PlainYearMonth(1999, 6);
+assert.sameValue(6, cal.month(yearMonth));
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/date-time.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/date-time.js
new file mode 100644
index 00000000000..eb78e0fa22f
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/date-time.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.month will take PlainDateTime and return
+  the value of the monthCode.
+info: |
+  6. Return ! ISOMonthCode(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let dateTime = new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)
+assert.sameValue("M08", cal.monthCode(dateTime));
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/date.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/date.js
new file mode 100644
index 00000000000..6802fc2355b
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/date.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode will take PlainDate and return
+  the value of the monthCode.
+info: |
+  5. Return ! ISOMonthCode(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let date = new Temporal.PlainDate(2021, 7, 15);
+assert.sameValue("M07", cal.monthCode(date));
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/month-day.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/month-day.js
new file mode 100644
index 00000000000..48fe504735c
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/month-day.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode will take PlainMonthDay and return
+  the value of the monthCode.
+info: |
+  6. Return ! ISOMonthCode(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let monthDay = new Temporal.PlainMonthDay(12, 25);
+assert.sameValue("M12", cal.monthCode(monthDay));
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/string.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/string.js
new file mode 100644
index 00000000000..db703753d9b
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/string.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode will take ISO8601 string and return
+  the value of the monthCode.
+info: |
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal
+    slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+assert.sameValue("M03", cal.monthCode("2019-03-15"));
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-range-error-ToTemporalDate.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-range-error-ToTemporalDate.js
new file mode 100644
index 00000000000..2528eeeeed4
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-range-error-ToTemporalDate.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode throws RangeError on
+  ToTemporalDate when temporalDateLike is invalid string.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike
+     does not have an [[InitializedTemporalDate]] or
+     [[InitializedTemporalYearMonth]] internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.throws(RangeError, () => cal.monthCode("invalid string"),
+    "Throw RangeError if temporalDateLike is invalid");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-type-error-RequireInternalSlot.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-type-error-RequireInternalSlot.js
new file mode 100644
index 00000000000..8f1a80c8738
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/throw-type-error-RequireInternalSlot.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode throws TypeError on RequireInternalSlot if object has no internal slot.
+info: |
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let badCal = { monthCode: cal.monthCode}
+assert.throws(TypeError, () => badCal.monthCode("2021-03-04"),
+    "Throw TypeError if there are no internal slot");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/year-month.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/year-month.js
new file mode 100644
index 00000000000..62d53d2d545
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/year-month.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthCode
+description: Temporal.Calendar.prototype.monthCode will take PlainYearMonth and return
+  the value of the monthCode.
+info: |
+  6. Return ! ISOMonthCode(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let yearMonth = new Temporal.PlainYearMonth(1999, 6);
+assert.sameValue("M06", cal.monthCode(yearMonth));
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/date-time.js b/test/built-ins/Temporal/Calendar/prototype/year/date-time.js
new file mode 100644
index 00000000000..a6044f53bbb
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/date-time.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year will take PlainDateTime and return
+  the value of the year.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let dateTime = new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)
+assert.sameValue(1997, cal.year(dateTime));
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/date.js b/test/built-ins/Temporal/Calendar/prototype/year/date.js
new file mode 100644
index 00000000000..2afec4ccfc6
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/date.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year will take PlainDate and return
+  the value of the year.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let date = new Temporal.PlainDate(2021, 7, 15);
+assert.sameValue(2021, cal.year(date));
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/string.js b/test/built-ins/Temporal/Calendar/prototype/year/string.js
new file mode 100644
index 00000000000..20dc9420cf1
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/string.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year will take ISO8601 string and return
+  the value of the year.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(2019, cal.year("2019-03-15"));
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/throw-range-error-ToTemporalDate.js b/test/built-ins/Temporal/Calendar/prototype/year/throw-range-error-ToTemporalDate.js
new file mode 100644
index 00000000000..24af39704e4
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/throw-range-error-ToTemporalDate.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year throws RangeError on
+  ToTemporalDate when temporalDateLike is invalid string.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike
+     does not have an [[InitializedTemporalDate]] or
+     [[InitializedTemporalYearMonth]] internal slot, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.throws(RangeError, () => cal.year("invalid string"),
+    "Throw RangeError if temporalDateLike is invalid");
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/throw-type-error-RequireInternalSlot.js b/test/built-ins/Temporal/Calendar/prototype/year/throw-type-error-RequireInternalSlot.js
new file mode 100644
index 00000000000..7439865a5da
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/throw-type-error-RequireInternalSlot.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year throws TypeError on
+  RequireInternalSlot if object has no internal slot.
+info: |
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let badCal = { year: cal.year }
+assert.throws(TypeError, () => badCal.year("2021-03-04"),
+    "Throw TypeError if there are no internal slot");
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/year-month.js b/test/built-ins/Temporal/Calendar/prototype/year/year-month.js
new file mode 100644
index 00000000000..eefbdf75d90
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/year-month.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: Temporal.Calendar.prototype.year will take PlainYearMonth and return
+  the value of the year.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let yearMonth = new Temporal.PlainYearMonth(1999, 6);
+assert.sameValue(1999, cal.year(yearMonth));