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diff --git a/Source/JavaScriptCore/runtime/DateInstance.h b/Source/JavaScriptCore/runtime/DateInstance.h
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+++ b/Source/JavaScriptCore/runtime/DateInstance.h
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef DateInstance_h
+#define DateInstance_h
+
+#include "JSWrapperObject.h"
+
+namespace JSC {
+
+class DateInstance : public JSWrapperObject {
+protected:
+    JS_EXPORT_PRIVATE DateInstance(VM&, Structure*);
+    void finishCreation(VM&);
+    JS_EXPORT_PRIVATE void finishCreation(VM&, double);
+
+    JS_EXPORT_PRIVATE static void destroy(JSCell*);
+
+public:
+    typedef JSWrapperObject Base;
+
+    static DateInstance* create(VM& vm, Structure* structure, double date)
+    {
+        DateInstance* instance = new (NotNull, allocateCell<DateInstance>(vm.heap)) DateInstance(vm, structure);
+        instance->finishCreation(vm, date);
+        return instance;
+    }
+
+    static DateInstance* create(VM& vm, Structure* structure)
+    {
+        DateInstance* instance = new (NotNull, allocateCell<DateInstance>(vm.heap)) DateInstance(vm, structure);
+        instance->finishCreation(vm);
+        return instance;
+    }
+
+    double internalNumber() const { return internalValue().asNumber(); }
+
+    DECLARE_EXPORT_INFO;
+
+    const GregorianDateTime* gregorianDateTime(ExecState* exec) const
+    {
+        if (m_data && m_data->m_gregorianDateTimeCachedForMS == internalNumber())
+            return &m_data->m_cachedGregorianDateTime;
+        return calculateGregorianDateTime(exec);
+    }
+
+    const GregorianDateTime* gregorianDateTimeUTC(ExecState* exec) const
+    {
+        if (m_data && m_data->m_gregorianDateTimeUTCCachedForMS == internalNumber())
+            return &m_data->m_cachedGregorianDateTimeUTC;
+        return calculateGregorianDateTimeUTC(exec);
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+    }
+
+private:
+    JS_EXPORT_PRIVATE const GregorianDateTime* calculateGregorianDateTime(ExecState*) const;
+    JS_EXPORT_PRIVATE const GregorianDateTime* calculateGregorianDateTimeUTC(ExecState*) const;
+
+    mutable RefPtr<DateInstanceData> m_data;
+};
+
+DateInstance* asDateInstance(JSValue);
+
+inline DateInstance* asDateInstance(JSValue value)
+{
+    ASSERT(asObject(value)->inherits(DateInstance::info()));
+    return static_cast<DateInstance*>(asObject(value));
+}
+
+} // namespace JSC
+
+#endif // DateInstance_h