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diff --git a/Source/JavaScriptCore/runtime/DateInstance.h 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 WTF {
+    struct GregorianDateTime;
+}
+
+namespace JSC {
+
+    class DateInstance : public JSWrapperObject {
+    public:
+        DateInstance(ExecState*, double);
+        DateInstance(ExecState*, NonNullPassRefPtr<Structure>, double);
+        explicit DateInstance(ExecState*, NonNullPassRefPtr<Structure>);
+
+        double internalNumber() const { return internalValue().uncheckedGetNumber(); }
+
+        static JS_EXPORTDATA const ClassInfo 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 PassRefPtr<Structure> createStructure(JSValue prototype)
+        {
+            return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
+        }
+
+    protected:
+        static const unsigned StructureFlags = OverridesMarkChildren | JSWrapperObject::StructureFlags;
+
+    private:
+        const GregorianDateTime* calculateGregorianDateTime(ExecState*) const;
+        const GregorianDateTime* calculateGregorianDateTimeUTC(ExecState*) const;
+        virtual const ClassInfo* classInfo() const { return &info; }
+
+        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