diff --git a/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp b/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
index 8d21d3e742c..e4b7bc5bb9a 100644
--- a/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
+++ b/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
@@ -6,6 +6,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Runtime/Intl/DateTimeFormat.h>
+#include <LibJS/Runtime/Intl/DateTimeFormatConstructor.h>
 #include <LibJS/Runtime/Temporal/AbstractOperations.h>
 #include <LibJS/Runtime/Temporal/Calendar.h>
 #include <LibJS/Runtime/Temporal/Duration.h>
@@ -532,15 +534,23 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_string)
 }
 
 // 5.3.35 Temporal.PlainDateTime.prototype.toLocaleString ( [ locales [ , options ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.tolocalestring
-// NOTE: This is the minimum toLocaleString implementation for engines without ECMA-402.
+// 15.12.4.1 Temporal.PlainDateTime.prototype.toLocaleString ( [ locales [ , options ] ] ), https://tc39.es/proposal-temporal/#sup-properties-of-the-temporal-plaindatetime-prototype-object
 JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_locale_string)
 {
+    auto& realm = *vm.current_realm();
+
+    auto locales = vm.argument(0);
+    auto options = vm.argument(1);
+
     // 1. Let dateTime be the this value.
     // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
     auto date_time = TRY(typed_this_object(vm));
 
-    // 3. Return ISODateTimeToString(dateTime.[[ISODateTime]], dateTime.[[Calendar]], AUTO, AUTO).
-    return PrimitiveString::create(vm, iso_date_time_to_string(date_time->iso_date_time(), date_time->calendar(), Auto {}, ShowCalendar::Auto));
+    // 3. Let dateFormat be ? CreateDateTimeFormat(%Intl.DateTimeFormat%, locales, options, ANY, ALL).
+    auto date_format = TRY(Intl::create_date_time_format(vm, realm.intrinsics().intl_date_time_format_constructor(), locales, options, Intl::OptionRequired::Any, Intl::OptionDefaults::All));
+
+    // 4. Return ? FormatDateTime(dateFormat, dateTime).
+    return PrimitiveString::create(vm, TRY(Intl::format_date_time(vm, date_format, date_time)));
 }
 
 // 5.3.36 Temporal.PlainDateTime.prototype.toJSON ( ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.tojson
diff --git a/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.toLocaleString.js b/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.toLocaleString.js
index 1f35fa767fe..b48814a577a 100644
--- a/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.toLocaleString.js
+++ b/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.toLocaleString.js
@@ -4,8 +4,19 @@ describe("correct behavior", () => {
     });
 
     test("basic functionality", () => {
-        const plainDateTime = new Temporal.PlainDateTime(2021, 11, 3, 1, 33, 5, 100, 200, 300);
-        expect(plainDateTime.toLocaleString()).toBe("2021-11-03T01:33:05.1002003");
+        const plainDateTime = new Temporal.PlainDateTime(
+            2021,
+            11,
+            3,
+            1,
+            33,
+            5,
+            100,
+            200,
+            300,
+            "gregory"
+        );
+        expect(plainDateTime.toLocaleString()).toBe("11/3/2021, 1:33:05 AM");
     });
 });