diff --git a/polyfill/lib/plaindate.mjs b/polyfill/lib/plaindate.mjs
index ba5004a5bd..9858e51752 100644
--- a/polyfill/lib/plaindate.mjs
+++ b/polyfill/lib/plaindate.mjs
@@ -438,7 +438,7 @@ export class PlainDate {
   static compare(one, two) {
     one = ES.ToTemporalDate(one, PlainDate);
     two = ES.ToTemporalDate(two, PlainDate);
-    const result = ES.CompareISODate(
+    return ES.CompareISODate(
       GetSlot(one, ISO_YEAR),
       GetSlot(one, ISO_MONTH),
       GetSlot(one, ISO_DAY),
@@ -446,8 +446,6 @@ export class PlainDate {
       GetSlot(two, ISO_MONTH),
       GetSlot(two, ISO_DAY)
     );
-    if (result !== 0) return result;
-    return ES.CalendarCompare(GetSlot(one, CALENDAR), GetSlot(two, CALENDAR));
   }
 }
 
diff --git a/polyfill/lib/plaindatetime.mjs b/polyfill/lib/plaindatetime.mjs
index d2a3b2aa53..85ddca03e8 100644
--- a/polyfill/lib/plaindatetime.mjs
+++ b/polyfill/lib/plaindatetime.mjs
@@ -794,7 +794,7 @@ export class PlainDateTime {
       const val2 = GetSlot(two, slot);
       if (val1 !== val2) return ES.ComparisonResult(val1 - val2);
     }
-    return ES.CalendarCompare(GetSlot(one, CALENDAR), GetSlot(two, CALENDAR));
+    return 0;
   }
 }
 
diff --git a/polyfill/lib/plainyearmonth.mjs b/polyfill/lib/plainyearmonth.mjs
index 9bd82c8cac..dbda28e838 100644
--- a/polyfill/lib/plainyearmonth.mjs
+++ b/polyfill/lib/plainyearmonth.mjs
@@ -396,12 +396,14 @@ export class PlainYearMonth {
   static compare(one, two) {
     one = ES.ToTemporalYearMonth(one, PlainYearMonth);
     two = ES.ToTemporalYearMonth(two, PlainYearMonth);
-    for (const slot of [ISO_YEAR, ISO_MONTH, ISO_DAY]) {
-      const val1 = GetSlot(one, slot);
-      const val2 = GetSlot(two, slot);
-      if (val1 !== val2) return ES.ComparisonResult(val1 - val2);
-    }
-    return ES.CalendarCompare(GetSlot(one, CALENDAR), GetSlot(two, CALENDAR));
+    return ES.CompareISODate(
+      GetSlot(one, ISO_YEAR),
+      GetSlot(one, ISO_MONTH),
+      GetSlot(one, ISO_DAY),
+      GetSlot(two, ISO_YEAR),
+      GetSlot(two, ISO_MONTH),
+      GetSlot(two, ISO_DAY)
+    );
   }
 }
 
diff --git a/polyfill/lib/zoneddatetime.mjs b/polyfill/lib/zoneddatetime.mjs
index d11ed7f69c..49714444ff 100644
--- a/polyfill/lib/zoneddatetime.mjs
+++ b/polyfill/lib/zoneddatetime.mjs
@@ -861,8 +861,6 @@ export class ZonedDateTime {
     const ns2 = GetSlot(two, EPOCHNANOSECONDS);
     if (bigInt(ns1).lesser(ns2)) return -1;
     if (bigInt(ns1).greater(ns2)) return 1;
-    const calendarResult = ES.CalendarCompare(GetSlot(one, CALENDAR), GetSlot(two, CALENDAR));
-    if (calendarResult) return calendarResult;
     return ES.TimeZoneCompare(GetSlot(one, TIME_ZONE), GetSlot(two, TIME_ZONE));
   }
 }
diff --git a/polyfill/test/PlainDate/constructor/compare/use-internal-slots.js b/polyfill/test/PlainDate/constructor/compare/use-internal-slots.js
index 8f885b9893..4c21cd540b 100644
--- a/polyfill/test/PlainDate/constructor/compare/use-internal-slots.js
+++ b/polyfill/test/PlainDate/constructor/compare/use-internal-slots.js
@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal-comparetemporaldate
+esid: sec-temporal-compareisodate
 ---*/
 
 function CustomError() {}
diff --git a/polyfill/test/PlainDateTime/constructor/compare/use-internal-slots.js b/polyfill/test/PlainDateTime/constructor/compare/use-internal-slots.js
index 7fb9f3e5e1..f6b1e10885 100644
--- a/polyfill/test/PlainDateTime/constructor/compare/use-internal-slots.js
+++ b/polyfill/test/PlainDateTime/constructor/compare/use-internal-slots.js
@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-esid: sec-temporal-comparetemporaldatetime
+esid: sec-temporal-compareisodatetime
 ---*/
 
 function CustomError() {}
diff --git a/polyfill/test/zoneddatetime.mjs b/polyfill/test/zoneddatetime.mjs
index 5efcd414dd..634552bddc 100644
--- a/polyfill/test/zoneddatetime.mjs
+++ b/polyfill/test/zoneddatetime.mjs
@@ -2813,8 +2813,8 @@ describe('ZonedDateTime', () => {
     it('compares time zone IDs if exact times are equal', () => {
       equal(ZonedDateTime.compare(zdt1, zdt1.withTimeZone('Asia/Kolkata')), 1);
     });
-    it('compares calendar IDs if exact times and time zones are equal', () => {
-      equal(ZonedDateTime.compare(zdt1, zdt1.withCalendar('japanese')), -1);
+    it('disregards calendar IDs if exact times and time zones are equal', () => {
+      equal(ZonedDateTime.compare(zdt1, zdt1.withCalendar('japanese')), 0);
     });
     it('compares exact time, not clock time', () => {
       const clockBefore = ZonedDateTime.from('1999-12-31T23:30-08:00[America/Vancouver]');