LibJS: Implement Temporal.ZonedDateTime.prototype.timeZone

3 files changed, 30 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
index 0322846dd1..0d25026f60 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
@@ -27,6 +27,7 @@ void ZonedDateTimePrototype::initialize(GlobalObject& global_object)
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm.heap(), "Temporal.ZonedDateTime"), Attribute::Configurable);
 
     define_native_accessor(vm.names.calendar, calendar_getter, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.timeZone, time_zone_getter, {}, Attribute::Configurable);
 }
 
 static ZonedDateTime* typed_this(GlobalObject& global_object)
@@ -55,4 +56,17 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::calendar_getter)
     return Value(&zoned_date_time->calendar());
 }
 
+// 6.3.4 get Temporal.ZonedDateTime.prototype.timeZone, https://tc39.es/proposal-temporal/#sec-get-temporal.zoneddatetime.prototype.timezone
+JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::time_zone_getter)
+{
+    // 1. Let zonedDateTime be the this value.
+    // 2. Perform ? RequireInternalSlot(zonedDateTime, [[InitializedTemporalZonedDateTime]]).
+    auto* zoned_date_time = typed_this(global_object);
+    if (vm.exception())
+        return {};
+
+    // 3. Return zonedDateTime.[[TimeZone]].
+    return Value(&zoned_date_time->time_zone());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
index dcfcaf392b..4aca7e200b 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.h
@@ -20,6 +20,7 @@ public:
 
 private:
     JS_DECLARE_NATIVE_FUNCTION(calendar_getter);
+    JS_DECLARE_NATIVE_FUNCTION(time_zone_getter);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.timeZone.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.timeZone.js
new file mode 100644
index 0000000000..e231bf96ce
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.timeZone.js
@@ -0,0 +1,15 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const timeZone = new Temporal.TimeZone("UTC");
+        const zonedDateTime = new Temporal.ZonedDateTime(0n, timeZone);
+        expect(zonedDateTime.timeZone).toBe(timeZone);
+    });
+});
+
+test("errors", () => {
+    test("this value must be a Temporal.ZonedDateTime object", () => {
+        expect(() => {
+            Reflect.get(Temporal.ZonedDateTime.prototype, "timeZone", "foo");
+        }).toThrowWithMessage(TypeError, "Not a Temporal.ZonedDateTime");
+    });
+});