diff --git a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
index 57ad824b47..e98f66ff04 100644
--- a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
+++ b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
@@ -235,6 +235,7 @@ namespace JS {
     P(toString)                              \
     P(toTimeString)                          \
     P(toUpperCase)                           \
+    P(toUTCString)                           \
     P(trace)                                 \
     P(trim)                                  \
     P(trimEnd)                               \
diff --git a/Userland/Libraries/LibJS/Runtime/DatePrototype.cpp b/Userland/Libraries/LibJS/Runtime/DatePrototype.cpp
index 36071284f1..2d98bf6adf 100644
--- a/Userland/Libraries/LibJS/Runtime/DatePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/DatePrototype.cpp
@@ -81,6 +81,7 @@ void DatePrototype::initialize(GlobalObject& global_object)
     define_native_function(vm.names.getUTCSeconds, get_utc_seconds, 0, attr);
     define_native_function(vm.names.toDateString, to_date_string, 0, attr);
     define_native_function(vm.names.toGMTString, to_gmt_string, 0, attr);
+    define_native_function(vm.names.toUTCString, to_utc_string, 0, attr);
     define_native_function(vm.names.toISOString, to_iso_string, 0, attr);
     define_native_function(vm.names.toLocaleDateString, to_locale_date_string, 0, attr);
     define_native_function(vm.names.toLocaleString, to_locale_string, 0, attr);
@@ -399,10 +400,19 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_date_string)
 }
 
 JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_gmt_string)
+{
+    // toGMTString is deprecated but kept for compatibility.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toGMTString
+    return to_utc_string(vm, global_object);
+}
+
+JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_utc_string)
 {
     auto* this_object = typed_this(vm, global_object);
     if (!this_object)
         return {};
+
+    // HTTP dates are always expressed in GMT.
     auto string = this_object->gmt_date_string();
     return js_string(vm, move(string));
 }
diff --git a/Userland/Libraries/LibJS/Runtime/DatePrototype.h b/Userland/Libraries/LibJS/Runtime/DatePrototype.h
index bf9bc49034..266e0c63ca 100644
--- a/Userland/Libraries/LibJS/Runtime/DatePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/DatePrototype.h
@@ -63,6 +63,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(get_utc_seconds);
     JS_DECLARE_NATIVE_FUNCTION(to_date_string);
     JS_DECLARE_NATIVE_FUNCTION(to_gmt_string);
+    JS_DECLARE_NATIVE_FUNCTION(to_utc_string);
     JS_DECLARE_NATIVE_FUNCTION(to_iso_string);
     JS_DECLARE_NATIVE_FUNCTION(to_locale_date_string);
     JS_DECLARE_NATIVE_FUNCTION(to_locale_string);