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diff --git a/i18npool/inc/calendar_hijri.hxx b/i18npool/inc/calendar_hijri.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_I18NPOOL_INC_CALENDAR_HIJRI_HXX
+#define INCLUDED_I18NPOOL_INC_CALENDAR_HIJRI_HXX
+
+#include "calendar_gregorian.hxx"
+
+
+
+
+namespace i18npool {
+
+class Calendar_hijri final : public Calendar_gregorian
+{
+public:
+
+    // Constructors
+    Calendar_hijri();
+
+private:
+    void mapToGregorian() override;
+    void mapFromGregorian() override;
+
+    // radians per degree (pi/180)
+    static const double RadPerDeg;
+
+    // Synodic Period (mean time between 2 successive new moon: 29d, 12 hr, 44min, 3sec
+    static const double SynPeriod;
+
+    static const double SynMonth;           // Solar days in a year/SynPeriod
+
+    // Julian day on Jan 1, 1900
+    static const double jd1900;
+
+    // Reference point: September 1984 25d 3h 10m UT. == 1405 Hijri == 1048 Synodial month from 1900
+    static const sal_Int32 SynRef;
+    static const sal_Int32 GregRef;
+
+    // Local time (Saudi Arabia)
+    static const double SA_TimeZone;        // Time Zone
+
+    // Period between 1.30pm - 6:30pm
+    static const double EveningPeriod;
+
+    // "Leap" years
+    static const sal_Int32 LeapYear[];
+
+private:
+    static double NewMoon(sal_Int32 n);
+    static void getHijri(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year);
+    static void ToGregorian(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year);
+    static void getGregorianDay(sal_Int32 jd, sal_Int32 *pnDay, sal_Int32 *pnMonth, sal_Int32 *pnYear);
+    static sal_Int32 getJulianDay(sal_Int32 day, sal_Int32 month, sal_Int32 year);
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */