1 files changed, 15 insertions, 1 deletions
diff --git a/JavaScriptCore/runtime/DateInstance.h b/JavaScriptCore/runtime/DateInstance.h
index 38b321c..44b7521 100644
--- a/JavaScriptCore/runtime/DateInstance.h
+++ b/JavaScriptCore/runtime/DateInstance.h
@@ -38,7 +38,19 @@ namespace JSC {
 
         static JS_EXPORTDATA const ClassInfo info;
 
-        bool getGregorianDateTime(ExecState*, bool outputIsUTC, WTF::GregorianDateTime&) const;
+        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)
         {
@@ -49,6 +61,8 @@ namespace JSC {
         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;