Add support for Julian and Milankovic calendars

These share their locale data with the Gregorian calendar, making them
virtually free to add. Still leave them out of the boot-strap build,
though.

[ChangeLog][QtCore][QCalendar] Added support for Julian and Milankovic
calendars. These are enabled by default, except in bootstrap builds.

Change-Id: I585045ed9e78c1e959957f6772b3e144093b701c
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/corelib/time/qmilankoviccalendar_p.h b/src/corelib/time/qmilankoviccalendar_p.h
new file mode 100644
index 0000000000..ebff7e7f39
--- /dev/null
+++ b/src/corelib/time/qmilankoviccalendar_p.h
@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMILANKOVICCALENDAR_CALENDAR_P_H
+#define QMILANKOVICCALENDAR_CALENDAR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of calendar implementations.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qromancalendar_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QMilankovicCalendar : public QRomanCalendar
+{
+public:
+    QMilankovicCalendar();
+    // Calendar properties:
+    QString name() const override;
+    QCalendar::System calendarSystem() const override;
+    // Date queries:
+    bool isLeapYear(int year) const override;
+    // Julian Day conversions:
+    bool dateToJulianDay(int year, int month, int day, qint64 *jd) const override;
+    QCalendar::YearMonthDay julianDayToDate(qint64 jd) const override;
+};
+
+QT_END_NAMESPACE
+
+#endif // QMILANKOVICCALENDAR_CALENDAR_P_H