1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInMonth/string.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInMonth/string.js
new file mode 100644
index 0000000000..0f236a1622
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/daysInMonth/string.js
@@ -0,0 +1,35 @@
+// |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.daysinmonth
+description: >
+  Temporal.Calendar.prototype.daysInMonth will take ISO8601 string
+  and return the number of days in that month.
+info: |
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have
+    an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal
+    slots, then
+    a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return 𝔽(! ISODaysInMonth(temporalDateLike.[[ISOYear]], temporalDateLike.[[ISOMonth]])).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(cal.daysInMonth("2019-01-18"), 31, 'cal.daysInMonth("2019-01-18") must return 31');
+// leap year
+assert.sameValue(cal.daysInMonth("2020-02-18"), 29, 'cal.daysInMonth("2020-02-18") must return 29');
+// non leap
+assert.sameValue(cal.daysInMonth("2019-02-18"), 28, 'cal.daysInMonth("2019-02-18") must return 28');
+assert.sameValue(cal.daysInMonth("2019-03-18"), 31, 'cal.daysInMonth("2019-03-18") must return 31');
+assert.sameValue(cal.daysInMonth("2019-04-18"), 30, 'cal.daysInMonth("2019-04-18") must return 30');
+assert.sameValue(cal.daysInMonth("2019-05-18"), 31, 'cal.daysInMonth("2019-05-18") must return 31');
+assert.sameValue(cal.daysInMonth("2019-06-18"), 30, 'cal.daysInMonth("2019-06-18") must return 30');
+assert.sameValue(cal.daysInMonth("2019-07-18"), 31, 'cal.daysInMonth("2019-07-18") must return 31');
+assert.sameValue(cal.daysInMonth("2019-08-18"), 31, 'cal.daysInMonth("2019-08-18") must return 31');
+assert.sameValue(cal.daysInMonth("2019-09-18"), 30, 'cal.daysInMonth("2019-09-18") must return 30');
+assert.sameValue(cal.daysInMonth("2019-10-18"), 31, 'cal.daysInMonth("2019-10-18") must return 31');
+assert.sameValue(cal.daysInMonth("2019-11-18"), 30, 'cal.daysInMonth("2019-11-18") must return 30');
+assert.sameValue(cal.daysInMonth("2019-12-18"), 31, 'cal.daysInMonth("2019-12-18") must return 31');
+
+reportCompare(0, 0);