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diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInYear/plain-date-time.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInYear/plain-date-time.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInYear/plain-date-time.js
@@ -0,0 +1,94 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-temporal.calendar.prototype.daysinyear
+description: >
+  Temporal.Calendar.prototype.daysInYear will take PlainDateTime and return
+  the number of days in a year.
+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 𝔽(! ISODaysInYear(temporalDateLike.[[ISOYear]])).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+let dt = new Temporal.PlainDateTime(1995, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(1995, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(1996, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  366,
+  'cal.daysInYear(new Temporal.PlainDateTime(1996, 8, 23, 5, 30, 13)) must return 366'
+);
+
+dt = new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(1998, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(1998, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(1999, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(1999, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(2000, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  366,
+  'cal.daysInYear(new Temporal.PlainDateTime(2000, 8, 23, 5, 30, 13)) must return 366'
+);
+
+dt = new Temporal.PlainDateTime(2001, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(2001, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(2002, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(2002, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(2003, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(2003, 8, 23, 5, 30, 13)) must return 365'
+);
+
+dt = new Temporal.PlainDateTime(2004, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  366,
+  'cal.daysInYear(new Temporal.PlainDateTime(2004, 8, 23, 5, 30, 13)) must return 366'
+);
+
+dt = new Temporal.PlainDateTime(2005, 8, 23, 5, 30, 13);
+assert.sameValue(
+  cal.daysInYear(dt),
+  365,
+  'cal.daysInYear(new Temporal.PlainDateTime(2005, 8, 23, 5, 30, 13)) must return 365'
+);
+
+reportCompare(0, 0);