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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+#include "qhijricalendar_p.h"
+#include "qhijricalendar_data_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \since 5.14
+
+  \class QHijriCalendar
+  \inmodule QtCore
+  \brief The QHijriCalendar class supports Islamic (Hijri) calendar implementations.
+
+  \section1 Islamic Calendar System
+
+  The Islamic, Muslim, or Hijri calendar is a lunar calendar consisting of 12
+  months in a year of 354 or 355 days. It is used (often alongside the
+  Gregorian calendar) to date events in many Muslim countries. It is also used
+  by Muslims to determine the proper days of Islamic holidays and rituals,
+  such as the annual period of fasting and the proper time for the pilgrimage
+  to Mecca.
+
+  Source: \l {https://en.wikipedia.org/wiki/Islamic_calendar}{Wikipedia page on
+  Hijri Calendar}
+
+  \section1 Support for variants
+
+  This base class provides the common details shared by all variants on the
+  Islamic calendar. Each year comprises 12 months of 29 or 30 days each; most
+  years have as many of 29 as of 30, but leap years extend one 29-day month to
+  30 days. In tabular versions of the calendar (where mathematical rules are
+  used to determine the details), odd-numbered months have 30 days, as does the
+  last (twelfth) month of a leap year; all other months have 29 days. Other
+  versions are based on actual astronomical observations of the moon's phase at
+  sunset, which vary from place to place.
+
+  \sa QIslamicCivilCalendar, QCalendar
+*/
+
+bool QHijriCalendar::isLunar() const
+{
+    return true;
+}
+
+bool QHijriCalendar::isLuniSolar() const
+{
+    return false;
+}
+
+bool QHijriCalendar::isSolar() const
+{
+    return false;
+}
+
+int QHijriCalendar::daysInMonth(int month, int year) const
+{
+    if (year == 0 || month < 1 || month > 12)
+        return 0;
+
+    if (month == 12 && isLeapYear(year))
+        return 30;
+
+    return month % 2 == 0 ? 29 : 30;
+}
+
+int QHijriCalendar::maxDaysInMonth() const
+{
+    return 30;
+}
+
+int QHijriCalendar::daysInYear(int year) const
+{
+    return monthsInYear(year) ? isLeapYear(year) ? 355 : 354 : 0;
+}
+
+const QCalendarLocale *QHijriCalendar::localeMonthIndexData() const
+{
+    return locale_data;
+}
+
+const ushort *QHijriCalendar::localeMonthData() const
+{
+    return months_data;
+}
+
+QT_END_NAMESPACE