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// Copyright (C) 2022 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QDATETIME_P_H
#define QDATETIME_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/private/qglobal_p.h>
#include "qplatformdefs.h"
#include "QtCore/qatomic.h"
#include "QtCore/qdatetime.h"
#include "QtCore/qshareddata.h"
#include "QtCore/qtimezone.h"
#if QT_CONFIG(timezone)
#include "qtimezone.h"
#endif
#include <chrono>
QT_BEGIN_NAMESPACE
class QDateTimePrivate : public QSharedData
{
public:
// forward the declarations from QDateTime (this makes them public)
typedef QDateTime::ShortData QDateTimeShortData;
typedef QDateTime::Data QDateTimeData;
// Never change or delete this enum, it is required for backwards compatible
// serialization of QDateTime before 5.2, so is essentially public API
enum Spec {
LocalUnknown = -1,
LocalStandard = 0,
LocalDST = 1,
UTC = 2,
OffsetFromUTC = 3,
TimeZone = 4
};
// Daylight Time Status
enum DaylightStatus {
UnknownDaylightTime = -1,
StandardTime = 0,
DaylightTime = 1
};
// Status of date/time
enum StatusFlag {
ShortData = 0x01,
ValidDate = 0x02,
ValidTime = 0x04,
ValidDateTime = 0x08,
TimeSpecMask = 0x30,
SetToStandardTime = 0x40,
SetToDaylightTime = 0x80,
ValidityMask = ValidDate | ValidTime | ValidDateTime,
DaylightMask = SetToStandardTime | SetToDaylightTime,
};
Q_DECLARE_FLAGS(StatusFlags, StatusFlag)
enum TransitionOption {
// Handling of a spring-forward (or other gap):
GapUseBefore = 2,
GapUseAfter = 4,
// Handling of a fall-back (or other repeated period):
FoldUseBefore = 0x20,
FoldUseAfter = 0x40,
// Quirk for negative DST:
FlipForReverseDst = 0x400,
GapMask = GapUseBefore | GapUseAfter,
FoldMask = FoldUseBefore | FoldUseAfter,
};
Q_DECLARE_FLAGS(TransitionOptions, TransitionOption)
enum {
TimeSpecShift = 4,
};
struct ZoneState {
qint64 when; // ms after zone/local 1970 start; may be revised from the input time.
int offset = 0; // seconds
DaylightStatus dst = UnknownDaylightTime;
// Other fields are set, if possible, even when valid is false due to spring-forward.
bool valid = false;
ZoneState(qint64 local) : when(local) {}
ZoneState(qint64 w, int o, DaylightStatus d, bool v = true)
: when(w), offset(o), dst(d), valid(v) {}
};
static QDateTime::Data create(QDate toDate, QTime toTime, const QTimeZone &timeZone,
QDateTime::TransitionResolution resolve);
#if QT_CONFIG(timezone)
static ZoneState zoneStateAtMillis(const QTimeZone &zone, qint64 millis,
TransitionOptions resolve);
#endif // timezone
static ZoneState expressUtcAsLocal(qint64 utcMSecs);
static ZoneState localStateAtMillis(qint64 millis, TransitionOptions resolve);
static QString localNameAtMillis(qint64 millis, DaylightStatus dst); // empty if unknown
StatusFlags m_status = StatusFlag(Qt::LocalTime << TimeSpecShift);
qint64 m_msecs = 0;
int m_offsetFromUtc = 0;
QTimeZone m_timeZone;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QDateTimePrivate::StatusFlags)
Q_DECLARE_OPERATORS_FOR_FLAGS(QDateTimePrivate::TransitionOptions)
namespace QtPrivate {
namespace DateTimeConstants {
using namespace std::chrono;
constexpr qint64 SECS_PER_MIN = minutes::period::num;
constexpr qint64 SECS_PER_HOUR = hours::period::num;
constexpr qint64 SECS_PER_DAY = SECS_PER_HOUR * 24; // std::chrono::days is C++20
constexpr qint64 MINS_PER_HOUR = std::ratio_divide<hours::period, minutes::period>::num;
constexpr qint64 MSECS_PER_SEC = milliseconds::period::den;
constexpr qint64 MSECS_PER_MIN = SECS_PER_MIN * MSECS_PER_SEC;
constexpr qint64 MSECS_PER_HOUR = SECS_PER_HOUR * MSECS_PER_SEC;
constexpr qint64 MSECS_PER_DAY = SECS_PER_DAY * MSECS_PER_SEC;
constexpr qint64 JULIAN_DAY_FOR_EPOCH = 2440588; // result of QDate(1970, 1, 1).toJulianDay()
constexpr qint64 JulianDayMax = Q_INT64_C( 784354017364);
constexpr qint64 JulianDayMin = Q_INT64_C(-784350574879);
}
}
QT_END_NAMESPACE
#endif // QDATETIME_P_H
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