diff --git a/Libraries/LibJS/Runtime/Date.h b/Libraries/LibJS/Runtime/Date.h
index ec816b1a015..d97bcdbe3fc 100644
--- a/Libraries/LibJS/Runtime/Date.h
+++ b/Libraries/LibJS/Runtime/Date.h
@@ -52,6 +52,11 @@ public:
         return String::format("%s %s", date_string().characters(), time_string().characters());
     }
 
+    // FIXME: One day, implement real locale support. Until then, everyone gets what the Clock MenuApplet displays.
+    String locale_date_string() const { return m_datetime.to_string("%Y-%m-%d"); }
+    String locale_string() const { return m_datetime.to_string(); }
+    String locale_time_string() const { return m_datetime.to_string("%H:%M:%S"); }
+
     virtual Value value_of() const override
     {
         return Value(static_cast<double>(m_datetime.timestamp() * 1000 + m_milliseconds));
diff --git a/Libraries/LibJS/Runtime/DatePrototype.cpp b/Libraries/LibJS/Runtime/DatePrototype.cpp
index 6aa8725eac0..b098ff47d3d 100644
--- a/Libraries/LibJS/Runtime/DatePrototype.cpp
+++ b/Libraries/LibJS/Runtime/DatePrototype.cpp
@@ -67,6 +67,9 @@ void DatePrototype::initialize(GlobalObject& global_object)
     define_native_function("getSeconds", get_seconds, 0, attr);
     define_native_function("getTime", get_time, 0, attr);
     define_native_function("toDateString", to_date_string, 0, attr);
+    define_native_function("toLocaleDateString", to_locale_date_string, 0, attr);
+    define_native_function("toLocaleString", to_locale_string, 0, attr);
+    define_native_function("toLocaleTimeString", to_locale_time_string, 0, attr);
     define_native_function("toTimeString", to_time_string, 0, attr);
     define_native_function("toString", to_string, 0, attr);
 }
@@ -166,6 +169,36 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_date_string)
     return js_string(interpreter, move(string));
 }
 
+JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_date_string)
+{
+    auto* this_object = typed_this(interpreter, global_object);
+    if (!this_object)
+        return {};
+    // FIXME: Optional locales, options params.
+    auto string = this_object->locale_date_string();
+    return js_string(interpreter, move(string));
+}
+
+JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_string)
+{
+    auto* this_object = typed_this(interpreter, global_object);
+    if (!this_object)
+        return {};
+    // FIXME: Optional locales, options params.
+    auto string = this_object->locale_string();
+    return js_string(interpreter, move(string));
+}
+
+JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_time_string)
+{
+    auto* this_object = typed_this(interpreter, global_object);
+    if (!this_object)
+        return {};
+    // FIXME: Optional locales, options params.
+    auto string = this_object->locale_time_string();
+    return js_string(interpreter, move(string));
+}
+
 JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_time_string)
 {
     auto* this_object = typed_this(interpreter, global_object);
diff --git a/Libraries/LibJS/Runtime/DatePrototype.h b/Libraries/LibJS/Runtime/DatePrototype.h
index e74a445049f..7efb094623e 100644
--- a/Libraries/LibJS/Runtime/DatePrototype.h
+++ b/Libraries/LibJS/Runtime/DatePrototype.h
@@ -48,6 +48,9 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(get_seconds);
     JS_DECLARE_NATIVE_FUNCTION(get_time);
     JS_DECLARE_NATIVE_FUNCTION(to_date_string);
+    JS_DECLARE_NATIVE_FUNCTION(to_locale_date_string);
+    JS_DECLARE_NATIVE_FUNCTION(to_locale_string);
+    JS_DECLARE_NATIVE_FUNCTION(to_locale_time_string);
     JS_DECLARE_NATIVE_FUNCTION(to_time_string);
     JS_DECLARE_NATIVE_FUNCTION(to_string);
 };