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diff --git a/scaddins/idl/com/sun/star/sheet/addin/XDateFunctions.idl b/scaddins/idl/com/sun/star/sheet/addin/XDateFunctions.idl
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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 .
+ */
+
+module com
+{
+module sun
+{
+module star
+{
+module sheet
+{
+module addin
+{
+    /**
+     * Interface with date functions.
+     */
+    interface XDateFunctions : com::sun::star::uno::XInterface
+    {
+        /// calculates the number of weeks between two dates.
+        long getDiffWeeks(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nStartDate, [in] long nEndDate, [in] long nMode )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// calculates the number of months between two dates.
+        long getDiffMonths(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nStartDate, [in] long nEndDate, [in] long nMode )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// calculates the number of years between two dates.
+        long getDiffYears(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nStartDate, [in] long nEndDate, [in] long nMode )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// checks if a date is in a leap year.
+        long getIsLeapYear(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nDate )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// calculates the number of days in a month.
+        long getDaysInMonth(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nDate )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// calculates the number of days in a year.
+        long getDaysInYear(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nDate )
+            raises( com::sun::star::lang::IllegalArgumentException );
+
+        /// calculates the number of weeks in a year.
+        long getWeeksInYear(
+                    [in] com::sun::star::beans::XPropertySet xOptions,
+                    [in] long nDate )
+            raises( com::sun::star::lang::IllegalArgumentException );
+    };
+};
+};
+};
+};
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */