diff --git a/builtin_date.go b/builtin_date.go
index 3a05832..59ed8a5 100644
--- a/builtin_date.go
+++ b/builtin_date.go
@@ -9,7 +9,9 @@ import (
 const (
 	// TODO Be like V8?
 	// builtinDate_goDateTimeLayout = "Mon Jan 2 2006 15:04:05 GMT-0700 (MST)"
-	builtinDate_goDateTimeLayout = Time.RFC1123
+	builtinDate_goDateTimeLayout = Time.RFC1123 // "Mon, 02 Jan 2006 15:04:05 MST"
+	builtinDate_goDateLayout     = "Mon, 02 Jan 2006"
+	builtinDate_goTimeLayout     = "15:04:05 MST"
 )
 
 func builtinDate(call FunctionCall) Value {
@@ -35,6 +37,22 @@ func builtinDate_toString(call FunctionCall) Value {
 	return toValue(date.Time().Local().Format(builtinDate_goDateTimeLayout))
 }
 
+func builtinDate_toDateString(call FunctionCall) Value {
+	date := dateObjectOf(call.thisObject())
+	if date.isNaN {
+		return toValue("Invalid Date")
+	}
+	return toValue(date.Time().Local().Format(builtinDate_goDateLayout))
+}
+
+func builtinDate_toTimeString(call FunctionCall) Value {
+	date := dateObjectOf(call.thisObject())
+	if date.isNaN {
+		return toValue("Invalid Date")
+	}
+	return toValue(date.Time().Local().Format(builtinDate_goTimeLayout))
+}
+
 func builtinDate_toUTCString(call FunctionCall) Value {
 	date := dateObjectOf(call.thisObject())
 	if date.isNaN {
diff --git a/date_test.go b/date_test.go
index 22107e4..9454088 100644
--- a/date_test.go
+++ b/date_test.go
@@ -99,6 +99,11 @@ func TestDate(t *testing.T) {
         abc = Object.getOwnPropertyDescriptor(Date, "parse");
         [ abc.value === Date.parse, abc.writable, abc.enumerable, abc.configurable ];
     `, "true,true,false,true")
+
+	test(`
+        abc = Object.getOwnPropertyDescriptor(Date.prototype, "toTimeString");
+        [ abc.value === Date.prototype.toTimeString, abc.writable, abc.enumerable, abc.configurable ];
+    `, "true,true,false,true")
 }
 
 func TestDate_parse(t *testing.T) {
diff --git a/global.go b/global.go
index 23b91b2..b5b4642 100644
--- a/global.go
+++ b/global.go
@@ -358,6 +358,8 @@ func newContext() *_runtime {
 		builtinNewDate,
 		self.Global.DatePrototype,
 		"toString", 0, builtinDate_toString,
+		"toDateString", 0, builtinDate_toDateString,
+		"toTimeString", 0, builtinDate_toTimeString,
 		"toUTCString", 0, builtinDate_toUTCString,
 		"toGMTString", 0, builtinDate_toGMTString,
 		"toLocaleString", 0, builtinDate_toLocaleString,