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diff --git a/chart2/source/view/inc/DateHelper.hxx b/chart2/source/view/inc/DateHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_CHART2_SOURCE_VIEW_INC_DATEHELPER_HXX
+#define INCLUDED_CHART2_SOURCE_VIEW_INC_DATEHELPER_HXX
+
+#include <tools/date.hxx>
+
+namespace chart
+{
+
+class DateHelper
+{
+public:
+    static bool IsInSameYear( const Date& rD1, const Date& rD2 );
+    static bool IsInSameMonth( const Date& rD1, const Date& rD2 );
+
+    static Date GetDateSomeMonthsAway( const Date& rD, sal_Int32 nMonthDistance );
+    static Date GetDateSomeYearsAway( const Date& rD, sal_Int32 nYearDistance );
+    static bool IsLessThanOneMonthAway( const Date& rD1, const Date& rD2 );
+    static bool IsLessThanOneYearAway( const Date& rD1, const Date& rD2 );
+
+    static double RasterizeDateValue( double fValue, const Date& rNullDate, long TimeResolution );
+};
+
+} //namespace chart
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */