diff --git a/builtin_date.go b/builtin_date.go
index c064771..a5cb2da 100644
--- a/builtin_date.go
+++ b/builtin_date.go
@@ -74,3 +74,30 @@ func builtinDate_parse(call FunctionCall) Value {
 func builtinDate_UTC(call FunctionCall) Value {
 	return toValue(newDateTime(call.ArgumentList))
 }
+
+// This is a placeholder
+func builtinDate_toLocaleString(call FunctionCall) Value {
+	date := dateObjectOf(call.thisObject())
+	if date.isNaN {
+		return toValue("Invalid Date")
+	}
+	return toValue(date.Time().Local().Format("2006-01-02 15:04:05"))
+}
+
+// This is a placeholder
+func builtinDate_toLocaleDateString(call FunctionCall) Value {
+	date := dateObjectOf(call.thisObject())
+	if date.isNaN {
+		return toValue("Invalid Date")
+	}
+	return toValue(date.Time().Local().Format("2006-01-02"))
+}
+
+// This is a placeholder
+func builtinDate_toLocaleTimeString(call FunctionCall) Value {
+	date := dateObjectOf(call.thisObject())
+	if date.isNaN {
+		return toValue("Invalid Date")
+	}
+	return toValue(date.Time().Local().Format("15:04:05"))
+}
diff --git a/date_test.go b/date_test.go
index 59f562c..8b93d31 100644
--- a/date_test.go
+++ b/date_test.go
@@ -19,6 +19,12 @@ func TestDate(t *testing.T) {
 
 	test(`Date`, "[function]")
 	test(`new Date(0).toUTCString()`, "Thu, 01 Jan 1970 00:00:00 UTC")
+	if false {
+		// TODO
+		test(`new Date(0).toLocaleString()`, "")
+		test(`new Date(0).toLocaleDateString()`, "")
+		test(`new Date(0).toLocaleTimeString()`, "")
+	}
 	test(`new Date(1348616313).getTime()`, "1348616313")
 	test(`new Date(1348616313).toUTCString()`, "Fri, 16 Jan 1970 14:36:56 UTC")
 	test(`abc = new Date(1348616313047); abc.toUTCString()`, "Tue, 25 Sep 2012 23:38:33 UTC")
diff --git a/global.go b/global.go
index 1293b57..fab0c4a 100644
--- a/global.go
+++ b/global.go
@@ -348,6 +348,9 @@ func newContext() *_runtime {
 		self.Global.DatePrototype,
 		"toString", 0, builtinDate_toString,
 		"toUTCString", 0, builtinDate_toUTCString,
+		"toLocaleString", 0, builtinDate_toLocaleString,
+		"toLocaleDateString", 0, builtinDate_toLocaleDateString,
+		"toLocaleTimeString", 0, builtinDate_toLocaleTimeString,
 		"valueOf", 0, func(call FunctionCall) Value {
 			date := dateObjectOf(call.thisObject())
 			if date.isNaN {