diff --git a/test/intl/regress-10526.js b/test/intl/regress-10526.js
new file mode 100644
index 0000000000..4e6c79bdf0
--- /dev/null
+++ b/test/intl/regress-10526.js
@@ -0,0 +1,21 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test date format in islamic-umalqura calendar of date prior to
+// -195366-07-23
+// On Android, islamic-umalqura calendar is only available on ar and fa locales.
+let dateOK = new Date (Date.UTC(-195366, 6, 23));
+let dateKO = new Date (Date.UTC(-195366, 6, 22));
+let dateDisplay = new Intl.DateTimeFormat (
+    'ar-u-ca-islamic-umalqura',
+    { timeZone : 'UTC', year : 'numeric', month :'long',
+      day : 'numeric', weekday : 'long' });
+assertEquals("Wed, 23 Jul -195366 00:00:00 GMT",
+    dateOK.toUTCString(), "dateOK.toUTCString()");
+assertEquals("Tue, 22 Jul -195366 00:00:00 GMT",
+    dateKO.toUTCString(), "dateKO.toUTCString()");
+assertEquals("الأربعاء، 17 ذو الحجة ‎-202003 هـ",
+    dateDisplay.format(dateOK), "dateDisplay.format(dateOK)");
+assertEquals("الثلاثاء، 16 ذو الحجة ‎-202003 هـ",
+    dateDisplay.format(dateKO), "dateDisplay.format(dateKO)");
diff --git a/test/intl/regress-10527.js b/test/intl/regress-10527.js
new file mode 100644
index 0000000000..f01131b756
--- /dev/null
+++ b/test/intl/regress-10527.js
@@ -0,0 +1,30 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test date format in  Islamic and Islamic-rgsa calendars of dates prior
+// to 0622-07-18
+// On Android, islamic and islamic-rgsac calendar are only available on ar
+// and fa locales.
+let dateOK = new Date (Date.UTC(622, 6, 18));
+let dateKO = new Date (Date.UTC(622, 6, 17));
+let dateDisplay = new Intl.DateTimeFormat (
+    'ar-u-ca-islamic',
+    { timeZone : 'UTC', year : 'numeric', month :'long',
+      day : 'numeric', weekday : 'long' });
+let dateDisplay2 = new Intl.DateTimeFormat (
+    'ar-u-ca-islamic-rgsa',
+    { timeZone : 'UTC', year : 'numeric', month :'long',
+      day : 'numeric', weekday : 'long' });
+assertEquals("Thu, 18 Jul 0622 00:00:00 GMT",
+    dateOK.toUTCString(), "dateOK.toUTCString()");
+assertEquals("Wed, 17 Jul 0622 00:00:00 GMT",
+    dateKO.toUTCString(), "dateKO.toUTCString()");
+assertEquals("الخميس، 1 محرم 1 هـ",
+    dateDisplay.format(dateOK), "dateDisplay.format(dateOK)");
+assertEquals("الأربعاء، 30 ذو الحجة 0 هـ",
+    dateDisplay.format(dateKO), "dateDisplay.format(dateKO)");
+assertEquals("الخميس، 1 محرم 1 هـ",
+    dateDisplay2.format(dateOK), "dateDisplay.format(dateOK)");
+assertEquals("الأربعاء، 30 ذو الحجة 0 هـ",
+    dateDisplay2.format(dateKO), "dateDisplay.format(dateKO)");
diff --git a/test/intl/regress-10528.js b/test/intl/regress-10528.js
new file mode 100644
index 0000000000..59194b0a7c
--- /dev/null
+++ b/test/intl/regress-10528.js
@@ -0,0 +1,20 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test date format in Hebrew calendar of dates prior to -003760-09-07
+// On Android, hebrew calendar is only available on he locale.
+let dateOK = new Date (Date.UTC(-3760, 8, 7));
+let dateKO = new Date (Date.UTC(-3760, 8, 6));
+let dateDisplay = new Intl.DateTimeFormat (
+    'he-u-ca-hebrew',
+    { timeZone : 'UTC', year : 'numeric', month :'long',
+      day : 'numeric', weekday : 'long' });
+assertEquals("Mon, 07 Sep -3760 00:00:00 GMT",
+    dateOK.toUTCString(), "dateOK.toUTCString()");
+assertEquals("Sun, 06 Sep -3760 00:00:00 GMT",
+    dateKO.toUTCString(), "dateKO.toUTCString()");
+assertEquals("יום שני, 1 בתשרי 1",
+    dateDisplay.format(dateOK), "dateDisplay.format(dateOK)");
+assertEquals("יום ראשון, 29 באלול 0",
+    dateDisplay.format(dateKO), "dateDisplay.format(dateKO)");
diff --git a/test/intl/regress-10529.js b/test/intl/regress-10529.js
new file mode 100644
index 0000000000..5cb0fbd5bf
--- /dev/null
+++ b/test/intl/regress-10529.js
@@ -0,0 +1,20 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test date format in Indian calendar of date prior to 0001-01-01
+// On Android, indian calendar is only available on hi locale.
+let dateOK = new Date ("0001-12-31T23:52:58.000Z");
+let dateKO = new Date ("0000-12-30T23:52:58.000Z");
+let dateDisplay = new Intl.DateTimeFormat (
+    'hi-u-ca-indian',
+    { timeZone : 'UTC', year : 'numeric', month :'long',
+      day : 'numeric', weekday : 'long' });
+assertEquals("Mon, 31 Dec 0001 23:52:58 GMT",
+    dateOK.toUTCString(), "dateOK.toUTCString()");
+assertEquals("Sat, 30 Dec 0000 23:52:58 GMT",
+    dateKO.toUTCString(), "dateKO.toUTCString()");
+assertEquals("शक -77 पौष 10, सोमवार",
+    dateDisplay.format(dateOK), "dateDisplay.format(dateOK)");
+assertEquals("शक -78 पौष 9, शनिवार",
+    dateDisplay.format(dateKO), "dateDisplay.format(dateKO)");