// Copyright (C) 2022 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <QDateTime>
#include <QTest>

#include <QLocale>
#include <QMap>
#include <QTimeZone>

#include <private/qglobal_p.h> // for the icu feature test
#include <private/qcomparisontesthelper_p.h>
#include <private/qdatetime_p.h>
#if !QT_CONFIG(timezone)
#  include <private/qtenvironmentvariables_p.h> // for qTzName()
#endif

using namespace QtPrivate::DateTimeConstants;
using namespace Qt::StringLiterals;

#if defined(Q_OS_WIN) && !QT_CONFIG(icu)
#  define USING_WIN_TZ
#endif

class tst_QDate : public QObject
{
    Q_OBJECT
private Q_SLOTS:
    void isNull_data();
    void isNull();
    void isValid_data();
    void isValid();
    void julianDay_data();
    void julianDay();
    void dayOfWeek_data();
    void dayOfWeek();
    void dayOfYear_data();
    void dayOfYear();
    void daysInMonth_data();
    void daysInMonth();
    void daysInYear_data();
    void daysInYear();
    void getDate();
    void weekNumber_invalid_data();
    void weekNumber_invalid();
    void weekNumber_data();
    void weekNumber();
    void startOfDay_endOfDay_data();
    void startOfDay_endOfDay();
    void startOfDay_endOfDay_fixed_data();
    void startOfDay_endOfDay_fixed();
    void startOfDay_endOfDay_bounds();
    void julianDaysLimits();
    void addDays_data();
    void addDays();
    void addMonths_data();
    void addMonths();
    void addYears_data();
    void addYears();
    void daysTo();
    void orderingCompiles();
    void operator_eq_eq_data();
    void operator_eq_eq();
    void ordering_data();
    void ordering();
    void ordering_chrono_types();
    void operator_insert_extract_data();
    void operator_insert_extract();
#if QT_CONFIG(datestring)
    void fromStringDateFormat_data();
    void fromStringDateFormat();
# if QT_CONFIG(datetimeparser)
    void fromStringFormat_data();
    void fromStringFormat();
# endif
    void toStringFormat_data();
    void toStringFormat();
    void toStringDateFormat_data();
    void toStringDateFormat();
#endif
    void isLeapYear();
    void yearsZeroToNinetyNine();
    void printNegativeYear_data() const;
    void printNegativeYear() const;
#if QT_CONFIG(datestring)
    void roundtripString() const;
#endif
    void roundtrip() const;
    void qdebug() const;
private:
    QDate defDate() const { return QDate(1900, 1, 1); }

    QDate epochDate() const {
        using namespace QtPrivate::DateTimeConstants;
        Q_ASSERT(JULIAN_DAY_FOR_EPOCH == QDate(1970, 1, 1).toJulianDay());
        return QDate::fromJulianDay(JULIAN_DAY_FOR_EPOCH);
    }

    static constexpr qint64 minJd = JulianDayMin;
    static constexpr qint64 maxJd = JulianDayMax;
    QDate invalidDate() const { return QDate(); }
};

Q_DECLARE_METATYPE(Qt::DateFormat)

void tst_QDate::isNull_data()
{
    QTest::addColumn<qint64>("jd");
    QTest::addColumn<bool>("null");

    QTest::newRow("qint64 min") << std::numeric_limits<qint64>::min() << true;
    QTest::newRow("minJd - 1")  << minJd - 1                          << true;
    QTest::newRow("minJd")      << minJd                              << false;
    QTest::newRow("minJd + 1")  << minJd + 1                          << false;
    QTest::newRow("maxJd - 1")  << maxJd - 1                          << false;
    QTest::newRow("maxJd")      << maxJd                              << false;
    QTest::newRow("maxJd + 1")  << maxJd + 1                          << true;
    QTest::newRow("qint64 max") << std::numeric_limits<qint64>::max() << true;
}

void tst_QDate::isNull()
{
    QFETCH(qint64, jd);

    QDate d = QDate::fromJulianDay(jd);
    QTEST(d.isNull(), "null");
}

void tst_QDate::isValid_data()
{
    qint64 nullJd = std::numeric_limits<qint64>::min();

    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<qint64>("jd");
    QTest::addColumn<bool>("valid");

    QTest::newRow("0-0-0")    <<    0 <<  0 << 0 << nullJd << false;
    QTest::newRow("month 0")  << 2000 <<  0 << 1 << nullJd << false;
    QTest::newRow("day 0")    << 2000 <<  1 << 0 << nullJd << false;

    QTest::newRow("month 13") << 2000 << 13 << 1 << nullJd << false;

    // test leap years
    QTest::newRow("non-leap")            << 2006 <<  2 << 29 << nullJd  << false;
    QTest::newRow("normal leap")         << 2004 <<  2 << 29 << qint64(2453065) << true;
    QTest::newRow("century leap 1900")   << 1900 <<  2 << 29 << nullJd  << false;
    QTest::newRow("century leap 2100")   << 2100 <<  2 << 29 << nullJd  << false;
    QTest::newRow("400-years leap 2000") << 2000 <<  2 << 29 << qint64(2451604) << true;
    QTest::newRow("400-years leap 2400") << 2400 <<  2 << 29 << qint64(2597701) << true;
    QTest::newRow("400-years leap 1600") << 1600 <<  2 << 29 << qint64(2305507) << true;
    QTest::newRow("year 0")              <<    0 <<  2 << 27 << nullJd  << false;

    // Test end of four-digit years:
    QTest::newRow("late") << 9999 << 12 << 31 << qint64(5373484) << true;

    // test the number of days in months:
    QTest::newRow("jan") << 2000 <<  1 << 31 << qint64(2451575) << true;
    QTest::newRow("feb") << 2000 <<  2 << 29 << qint64(2451604) << true; // same data as 400-years leap
    QTest::newRow("mar") << 2000 <<  3 << 31 << qint64(2451635) << true;
    QTest::newRow("apr") << 2000 <<  4 << 30 << qint64(2451665) << true;
    QTest::newRow("may") << 2000 <<  5 << 31 << qint64(2451696) << true;
    QTest::newRow("jun") << 2000 <<  6 << 30 << qint64(2451726) << true;
    QTest::newRow("jul") << 2000 <<  7 << 31 << qint64(2451757) << true;
    QTest::newRow("aug") << 2000 <<  8 << 31 << qint64(2451788) << true;
    QTest::newRow("sep") << 2000 <<  9 << 30 << qint64(2451818) << true;
    QTest::newRow("oct") << 2000 << 10 << 31 << qint64(2451849) << true;
    QTest::newRow("nov") << 2000 << 11 << 30 << qint64(2451879) << true;
    QTest::newRow("dec") << 2000 << 12 << 31 << qint64(2451910) << true;

    // and invalid dates:
    QTest::newRow("ijan") << 2000 <<  1 << 32 << nullJd << false;
    QTest::newRow("ifeb") << 2000 <<  2 << 30 << nullJd << false;
    QTest::newRow("imar") << 2000 <<  3 << 32 << nullJd << false;
    QTest::newRow("iapr") << 2000 <<  4 << 31 << nullJd << false;
    QTest::newRow("imay") << 2000 <<  5 << 32 << nullJd << false;
    QTest::newRow("ijun") << 2000 <<  6 << 31 << nullJd << false;
    QTest::newRow("ijul") << 2000 <<  7 << 32 << nullJd << false;
    QTest::newRow("iaug") << 2000 <<  8 << 32 << nullJd << false;
    QTest::newRow("isep") << 2000 <<  9 << 31 << nullJd << false;
    QTest::newRow("ioct") << 2000 << 10 << 32 << nullJd << false;
    QTest::newRow("inov") << 2000 << 11 << 31 << nullJd << false;
    QTest::newRow("idec") << 2000 << 12 << 32 << nullJd << false;

    // the beginning of the Julian Day calendar:
    QTest::newRow("jd earliest formula") <<   -4800 <<  1 <<  1 << qint64(   -31738) << true;
    QTest::newRow("jd -1")               <<   -4714 << 11 << 23 << qint64(       -1) << true;
    QTest::newRow("jd 0")                <<   -4714 << 11 << 24 << qint64(        0) << true;
    QTest::newRow("jd 1")                <<   -4714 << 11 << 25 << qint64(        1) << true;
    QTest::newRow("jd latest formula")   << 1400000 << 12 << 31 << qint64(513060925) << true;
}

#if __cpp_lib_chrono >= 201907L
// QDate has a bigger range than year_month_date. The tests use this bigger
// range. However building a year_month_time with "out of range" data has
// unspecified results, so don't do that. See [time.cal.year],
// [time.cal.month], [time.cal.day]. Also, std::chrono::year has a year 0, so
// take that into account.
static std::optional<std::chrono::year_month_day> convertToStdYearMonthDay(int y, int m, int d)
{
    using namespace std::chrono;

    if (y >= int((year::min)())
            && y <= int((year::max)())
            && m >= 0
            && m <= 255
            && d >= 0
            && d <= 255)
    {
        if (y < 0)
            ++y;
        return std::make_optional(year(y) / m / d);
    }

    return std::nullopt;
}
#endif

void tst_QDate::isValid()
{
    QFETCH(int, year);
    QFETCH(int, month);
    QFETCH(int, day);
    QFETCH(qint64, jd);
    QFETCH(bool, valid);

    QCOMPARE(QDate::isValid(year, month, day), valid);

    QDate d;
    d.setDate(year, month, day);
    QCOMPARE(d.isValid(), valid);
    QCOMPARE(d.toJulianDay(), jd);

    if (valid) {
        QCOMPARE(d.year(), year);
        QCOMPARE(d.month(), month);
        QCOMPARE(d.day(), day);
#if __cpp_lib_chrono >= 201907L
        std::optional<std::chrono::year_month_day> ymd = convertToStdYearMonthDay(year, month, day);
        if (ymd) {
            QDate d = *ymd;
            QCOMPARE(d.year(), year);
            QCOMPARE(d.month(), month);
            QCOMPARE(d.day(), day);

            const std::chrono::sys_days qdateSysDays = d.toStdSysDays();
            const std::chrono::sys_days ymdSysDays = *ymd;
            QCOMPARE(qdateSysDays, ymdSysDays);
        }
#endif
    } else {
        QCOMPARE(d.year(), 0);
        QCOMPARE(d.month(), 0);
        QCOMPARE(d.day(), 0);
    }
}

void tst_QDate::julianDay_data()
{
    isValid_data();
}

void tst_QDate::julianDay()
{
    QFETCH(int, year);
    QFETCH(int, month);
    QFETCH(int, day);
    QFETCH(qint64, jd);

    {
        QDate d;
        d.setDate(year, month, day);
        QCOMPARE(d.toJulianDay(), jd);
    }

    if (jd != std::numeric_limits<qint64>::min()) {
        QDate d = QDate::fromJulianDay(jd);
        QCOMPARE(d.year(), year);
        QCOMPARE(d.month(), month);
        QCOMPARE(d.day(), day);
    }
}

void tst_QDate::dayOfWeek_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("dayOfWeek");

    QTest::newRow("data0")  <<     0 <<  0 <<  0 << 0;
    QTest::newRow("data1")  <<  2000 <<  1 <<  3 << 1;
    QTest::newRow("data2")  <<  2000 <<  1 <<  4 << 2;
    QTest::newRow("data3")  <<  2000 <<  1 <<  5 << 3;
    QTest::newRow("data4")  <<  2000 <<  1 <<  6 << 4;
    QTest::newRow("data5")  <<  2000 <<  1 <<  7 << 5;
    QTest::newRow("data6")  <<  2000 <<  1 <<  8 << 6;
    QTest::newRow("data7")  <<  2000 <<  1 <<  9 << 7;
    QTest::newRow("data8")  << -4800 <<  1 <<  1 << 1;
    QTest::newRow("data9")  << -4800 <<  1 <<  2 << 2;
    QTest::newRow("data10") << -4800 <<  1 <<  3 << 3;
    QTest::newRow("data11") << -4800 <<  1 <<  4 << 4;
    QTest::newRow("data12") << -4800 <<  1 <<  5 << 5;
    QTest::newRow("data13") << -4800 <<  1 <<  6 << 6;
    QTest::newRow("data14") << -4800 <<  1 <<  7 << 7;
    QTest::newRow("data15") << -4800 <<  1 <<  8 << 1;
}

void tst_QDate::dayOfWeek()
{
    QFETCH(int, year);
    QFETCH(int, month);
    QFETCH(int, day);
    QFETCH(int, dayOfWeek);

    QDate dt(year, month, day);
    QCOMPARE(dt.dayOfWeek(), dayOfWeek);
}

void tst_QDate::dayOfYear_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("dayOfYear");

    QTest::newRow("data0")  <<     0 <<  0 <<  0 <<   0;
    QTest::newRow("data1")  <<  2000 <<  1 <<  1 <<   1;
    QTest::newRow("data2")  <<  2000 <<  1 <<  2 <<   2;
    QTest::newRow("data3")  <<  2000 <<  1 <<  3 <<   3;
    QTest::newRow("data4")  <<  2000 << 12 << 31 << 366;
    QTest::newRow("data5")  <<  2001 << 12 << 31 << 365;
    QTest::newRow("data6")  <<  1815 <<  1 <<  1 <<   1;
    QTest::newRow("data7")  <<  1815 << 12 << 31 << 365;
    QTest::newRow("data8")  <<  1500 <<  1 <<  1 <<   1;
    QTest::newRow("data9")  <<  1500 << 12 << 31 << 365;
    QTest::newRow("data10") << -1500 <<  1 <<  1 <<   1;
    QTest::newRow("data11") << -1500 << 12 << 31 << 365;
    QTest::newRow("data12") << -4800 <<  1 <<  1 <<   1;
    QTest::newRow("data13") << -4800 << 12 << 31 << 365;
}

void tst_QDate::dayOfYear()
{
    QFETCH(int, year);
    QFETCH(int, month);
    QFETCH(int, day);
    QFETCH(int, dayOfYear);

    QDate dt(year, month, day);
    QCOMPARE(dt.dayOfYear(), dayOfYear);
}

void tst_QDate::daysInMonth_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("daysInMonth");

    QTest::newRow("data0")  <<     0 <<  0 <<  0 <<   0;
    QTest::newRow("data1")  <<  2000 <<  1 <<  1 <<  31;
    QTest::newRow("data2")  <<  2000 <<  2 <<  1 <<  29;
    QTest::newRow("data3")  <<  2000 <<  3 <<  1 <<  31;
    QTest::newRow("data4")  <<  2000 <<  4 <<  1 <<  30;
    QTest::newRow("data5")  <<  2000 <<  5 <<  1 <<  31;
    QTest::newRow("data6")  <<  2000 <<  6 <<  1 <<  30;
    QTest::newRow("data7")  <<  2000 <<  7 <<  1 <<  31;
    QTest::newRow("data8")  <<  2000 <<  8 <<  1 <<  31;
    QTest::newRow("data9")  <<  2000 <<  9 <<  1 <<  30;
    QTest::newRow("data10") <<  2000 << 10 <<  1 <<  31;
    QTest::newRow("data11") <<  2000 << 11 <<  1 <<  30;
    QTest::newRow("data12") <<  2000 << 12 <<  1 <<  31;
    QTest::newRow("data13") <<  2001 <<  2 <<  1 <<  28;
    QTest::newRow("data14")  <<  2000 <<  0 <<  1 <<   0;
}

void tst_QDate::daysInMonth()
{
    QFETCH(int, year);
    QFETCH(int, month);
    QFETCH(int, day);
    QFETCH(int, daysInMonth);

    QDate dt(year, month, day);
    QCOMPARE(dt.daysInMonth(), daysInMonth);
}

void tst_QDate::daysInYear_data()
{
    QTest::addColumn<QDate>("date");
    QTest::addColumn<int>("expectedDaysInYear");

    QTest::newRow("2000, 1, 1") << QDate(2000, 1, 1) << 366;
    QTest::newRow("2001, 1, 1") << QDate(2001, 1, 1) << 365;
    QTest::newRow("4, 1, 1") << QDate(4, 1, 1) << 366;
    QTest::newRow("5, 1, 1") << QDate(5, 1, 1) << 365;
    QTest::newRow("0, 0, 0") << QDate(0, 0, 0) << 0;
}

void tst_QDate::daysInYear()
{
    QFETCH(QDate, date);
    QFETCH(int, expectedDaysInYear);

    QCOMPARE(date.daysInYear(), expectedDaysInYear);
}

void tst_QDate::getDate()
{
    int y, m, d;
    QDate dt(2000, 1, 1);
    dt.getDate(&y, &m, &d);
    QCOMPARE(y, 2000);
    QCOMPARE(m, 1);
    QCOMPARE(d, 1);
    dt.setDate(0, 0, 0);
    dt.getDate(&y, &m, &d);
    QCOMPARE(y, 0);
    QCOMPARE(m, 0);
    QCOMPARE(d, 0);
}

void tst_QDate::weekNumber_data()
{
    QTest::addColumn<int>("expectedWeekNum");
    QTest::addColumn<int>("expectedYearNum");
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");

    enum { Thursday = 4 };
    bool wasLastYearLong = false;   // 1999 was not a long (53-week) year
    bool isLongYear;

    // full 400-year cycle for Jan 1, 4 and Dec 28, 31
    for (int yr = 2000; yr < 2400; ++yr, wasLastYearLong = isLongYear) {
        QByteArray yrstr = QByteArray::number(yr);
        int wday = QDate(yr, 1, 1).dayOfWeek();

        // the year is 53-week long if Jan 1 is Thursday or, if it's a leap year, a Wednesday
        isLongYear = (wday == Thursday) || (QDate::isLeapYear(yr) && wday == Thursday - 1);

        // Jan 4 is always on week 1
        QTest::newRow(yrstr + "-01-04") << 1 << yr << yr << 1 << 4;

        // Dec 28 is always on the last week
        QTest::newRow(yrstr + "-12-28") << (52 + isLongYear) << yr << yr << 12 << 28;

        // Jan 1 is on either on week 1 or on the last week of the previous year
        QTest::newRow(yrstr + "-01-01")
                << (wday <= Thursday ? 1 : 52 + wasLastYearLong)
                << (wday <= Thursday ? yr : yr - 1)
                << yr << 1 << 1;

        // Dec 31 is either on the last week or week 1 of the next year
        wday = QDate(yr, 12, 31).dayOfWeek();
        QTest::newRow(yrstr + "-12-31")
                << (wday >= Thursday ? 52 + isLongYear : 1)
                << (wday >= Thursday ? yr : yr + 1)
                << yr << 12 << 31;
    }
}

void tst_QDate::weekNumber()
{
    int yearNumber;
    QFETCH( int, year );
    QFETCH( int, month );
    QFETCH( int, day );
    QFETCH( int, expectedWeekNum );
    QFETCH( int, expectedYearNum );
    QDate dt1( year, month, day );
    QCOMPARE( dt1.weekNumber( &yearNumber ), expectedWeekNum );
    QCOMPARE( yearNumber, expectedYearNum );
}

void tst_QDate::weekNumber_invalid_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");

    //next we fill it with data
    QTest::newRow( "data0" )  << 0 << 0 << 0;
    QTest::newRow( "data1" )  << 2001 << 1 << 32;
    QTest::newRow( "data2" )  << 1999 << 2 << 29;
}

void tst_QDate::weekNumber_invalid()
{
    QDate dt;
    int yearNumber;
    QCOMPARE( dt.weekNumber( &yearNumber ), 0 );
}

/* The MS backend tends to lack data for historical transitions.  So some of the
   transition-based tests will get wrong results, that we can't do anything
   about, when using that backend.  Rather than complicating the #if-ery more,
   overtly record, in a flags column, which we need to ignore and merely make
   the testing of these flags subject to #if-ery.

   Android appears to lack at least one other.
*/
enum BackendKludge { IgnoreStart = 1, IgnoreEnd = 2, };
Q_DECLARE_FLAGS(BackendKludges, BackendKludge)
Q_DECLARE_OPERATORS_FOR_FLAGS(BackendKludges)

void tst_QDate::startOfDay_endOfDay_data()
{
    QTest::addColumn<QDate>("date"); // Typically a spring-forward.
    // A zone in which that date's start and end are worth checking:
    QTest::addColumn<QTimeZone>("zone");
    // The start and end times in that zone:
    QTest::addColumn<QTime>("start");
    QTest::addColumn<QTime>("end");
    // Ignored for backends that don't need it:
    QTest::addColumn<BackendKludges>("kludge");

    const QTime early(0, 0), late(23, 59, 59, 999), invalid(QDateTime().time());
    constexpr BackendKludges Clean = {};
    constexpr BackendKludges IgnoreBoth = IgnoreStart | IgnoreEnd;
#ifdef USING_WIN_TZ
    constexpr BackendKludges MsNoStart = IgnoreStart;
    constexpr BackendKludges MsNoBoth = IgnoreBoth;
#else
    constexpr BackendKludges MsNoStart = Clean;
    constexpr BackendKludges MsNoBoth = Clean;
    // And use IgnoreBoth directly for the one transition Android lacks.
#endif
    const QTimeZone UTC(QTimeZone::UTC);

    using Bound = std::numeric_limits<qint64>;
    const auto dateAtMillis = [UTC](qint64 millis) {
        return QDateTime::fromMSecsSinceEpoch(millis, UTC).date();
    };

    // UTC and fixed offset are always available and predictable:
    QTest::newRow("epoch") << epochDate() << UTC << early << late << Clean;

    // First and last days in QDateTime's supported range:
    QTest::newRow("earliest")
        << dateAtMillis(Bound::min()) << UTC << invalid << late << Clean;
    QTest::newRow("latest")
        << dateAtMillis(Bound::max()) << UTC << early << invalid << Clean;

    const struct {
        const char *test;
        const char *zone;
        const QDate day;
        const QTime start;
        const QTime end;
        const BackendKludges msOpt;
    } transitions[] = {
        // The western Mexico time-zones skipped the first hour of 1970.
        { "BajaMexico", "America/Hermosillo", QDate(1970, 1, 1), QTime(1, 0), late, MsNoStart },

        // Compare tst_QDateTime::fromStringDateFormat(ISO 24:00 in DST).
        { "Brazil", "America/Sao_Paulo", QDate(2008, 10, 19), QTime(1, 0), late, Clean },

        // Several southern zones within EET (but not the northern ones) spent
        // part of the 1990s using midnight as spring transition.
        { "Sofia", "Europe/Sofia", QDate(1994, 3, 27), QTime(1, 0), late, MsNoStart },

        // Two Pacific zones skipped days to get on the west of the
        // International Date Line; those days have neither start nor end.
        { "Kiritimati", "Pacific/Kiritimati", QDate(1994, 12, 31), invalid, invalid, IgnoreBoth },
        { "Samoa", "Pacific/Apia", QDate(2011, 12, 30), invalid, invalid, MsNoBoth },

        // TODO: find other zones with transitions at/crossing midnight.
    };
    const QTimeZone local = QTimeZone::LocalTime;

#if QT_CONFIG(timezone)
    const QTimeZone sys = QTimeZone::systemTimeZone();
    QVERIFY2(sys.isValid(), "Test depends on properly configured system");
    for (const auto &tran : transitions) {
        if (QTimeZone zone(tran.zone); zone.isValid()) {
            QTest::newRow(tran.test)
                << tran.day << zone << tran.start << tran.end << tran.msOpt;
            if (zone == sys) {
                QTest::addRow("Local=%s", tran.test)
                    << tran.day << local << tran.start << tran.end << tran.msOpt;
            }
        }
    }
#else
    const auto isLocalZone = [](const char *zone) {
        const QLatin1StringView name(zone);
        for (int i = 0; i < 2; ++i) {
            if (qTzName(i) == name)
                return true;
        }
        return false;
    };
    for (const auto &tran : transitions) {
        if (isLocalZone(tran.zone)) { // Might need a different name to match
            QTest::addRow("Local=%s", tran.test)
                << tran.day << local << tran.start << tran.end << tran.msOpt;
        }
    }
#endif // timezone
}

void tst_QDate::startOfDay_endOfDay()
{
    QFETCH(const QDate, date);
    QFETCH(const QTimeZone, zone);
    QFETCH(const QTime, start);
    QFETCH(const QTime, end);
#if defined(USING_WIN_TZ) || defined(Q_OS_ANDROID) // Coping with backend limitations.
    QFETCH(const BackendKludges, kludge);
#define UNLESSKLUDGE(flag) if (!kludge.testFlag(flag))
#else
#define UNLESSKLUDGE(flag)
#endif
    QVERIFY(zone.isValid());

    QDateTime front(date.startOfDay(zone)), back(date.endOfDay(zone));
    if (end.isValid())
        QCOMPARE(date.addDays(1).startOfDay(zone).addMSecs(-1), back);
    if (start.isValid())
        QCOMPARE(date.addDays(-1).endOfDay(zone).addMSecs(1), front);

    if (start.isValid()) {
        QVERIFY(front.isValid());
        QCOMPARE(front.date(), date);
        UNLESSKLUDGE(IgnoreStart) QCOMPARE(front.time(), start);
    } else UNLESSKLUDGE(IgnoreStart) {
        auto report = qScopeGuard([front]() { qDebug() << "Start of day:" << front; });
        QVERIFY(!front.isValid());
        report.dismiss();
    }
    if (end.isValid()) {
        QVERIFY(back.isValid());
        QCOMPARE(back.date(), date);
        UNLESSKLUDGE(IgnoreEnd) QCOMPARE(back.time(), end);
    } else UNLESSKLUDGE(IgnoreEnd) {
        auto report = qScopeGuard([back]() { qDebug() << "End of day:" << back; });
        QVERIFY(!back.isValid());
        report.dismiss();
    }
#undef UNLESSKLUDGE
}

void tst_QDate::startOfDay_endOfDay_fixed_data()
{
    QTest::addColumn<QDate>("date");

    const qint64 kilo(1000);
    using Bounds = std::numeric_limits<qint64>;
    const auto UTC = QTimeZone::UTC;
    const QDateTime first(QDateTime::fromMSecsSinceEpoch(Bounds::min() + 1, UTC));
    const QDateTime start32sign(QDateTime::fromMSecsSinceEpoch(Q_INT64_C(-0x80000000) * kilo, UTC));
    const QDateTime end32sign(QDateTime::fromMSecsSinceEpoch(Q_INT64_C(0x80000000) * kilo, UTC));
    const QDateTime end32unsign(QDateTime::fromMSecsSinceEpoch(Q_INT64_C(0x100000000) * kilo, UTC));
    const QDateTime last(QDateTime::fromMSecsSinceEpoch(Bounds::max(), UTC));

    QTest::newRow("epoch") <<  epochDate();
    QTest::newRow("y2k-leap-day") << QDate(2000, 2, 29);
    QTest::newRow("start-1900") << QDate(1900, 1, 1); // QTBUG-99747
   // Just outside the start and end of 32-bit time_t:
    QTest::newRow("pre-sign32") << QDate(start32sign.date().year(), 1, 1);
    QTest::newRow("post-sign32") << QDate(end32sign.date().year(), 12, 31);
    QTest::newRow("post-uint32") << QDate(end32unsign.date().year(), 12, 31);
    // Just inside the start and end of QDateTime's range:
    QTest::newRow("first-full") << first.date().addDays(1);
    QTest::newRow("last-full") << last.date().addDays(-1);
}

void tst_QDate::startOfDay_endOfDay_fixed()
{
    const QTime early(0, 0), late(23, 59, 59, 999);
    QFETCH(QDate, date);

    QDateTime start(date.startOfDay(QTimeZone::UTC));
    QDateTime end(date.endOfDay(QTimeZone::UTC));
    QCOMPARE(start.date(), date);
    QCOMPARE(end.date(), date);
    QCOMPARE(start.time(), early);
    QCOMPARE(end.time(), late);
    QCOMPARE(date.addDays(1).startOfDay(QTimeZone::UTC).addMSecs(-1), end);
    QCOMPARE(date.addDays(-1).endOfDay(QTimeZone::UTC).addMSecs(1), start);
    for (int offset = -60 * 16; offset <= 60 * 16; offset += 65) {
        const auto zone = QTimeZone::fromSecondsAheadOfUtc(offset);
        start = date.startOfDay(zone);
        end = date.endOfDay(zone);
        QCOMPARE(start.date(), date);
        QCOMPARE(end.date(), date);
        QCOMPARE(start.time(), early);
        QCOMPARE(end.time(), late);
        QCOMPARE(date.addDays(1).startOfDay(zone).addMSecs(-1), end);
        QCOMPARE(date.addDays(-1).endOfDay(zone).addMSecs(1), start);
    }

    // Minimal testing for LocalTime and TimeZone
    QCOMPARE(date.startOfDay().date(), date);
    QCOMPARE(date.endOfDay().date(), date);
#if QT_CONFIG(timezone)
    const QTimeZone cet("Europe/Oslo");
    if (cet.isValid()) {
        QCOMPARE(date.startOfDay(cet).date(), date);
        QCOMPARE(date.endOfDay(cet).date(), date);
    }
#endif
}

void tst_QDate::startOfDay_endOfDay_bounds()
{
    // Check the days in which QDateTime's range starts and ends:
    using Bounds = std::numeric_limits<qint64>;
    const auto UTC = QTimeZone::UTC;
    const QDateTime
        first(QDateTime::fromMSecsSinceEpoch(Bounds::min(), UTC)),
        last(QDateTime::fromMSecsSinceEpoch(Bounds::max(), UTC)),
        epoch(QDateTime::fromMSecsSinceEpoch(0, UTC));
    // First, check these *are* the start and end of QDateTime's range:
    QVERIFY(first.isValid());
    QVERIFY(last.isValid());
    QVERIFY(first < epoch);
    QVERIFY(last > epoch);
    QVERIFY(!first.addMSecs(-1).isValid() || first.addMSecs(-1) > first);
    QVERIFY(!last.addMSecs(1).isValid() || last.addMSecs(1) < last);

    // Now test start/end methods with them:
    QCOMPARE(first.date().endOfDay(UTC).time(), QTime(23, 59, 59, 999));
    QCOMPARE(last.date().startOfDay(UTC).time(), QTime(0, 0));
    QVERIFY(!first.date().startOfDay(UTC).isValid());
    QVERIFY(!last.date().endOfDay(UTC).isValid());

    // Test for QTBUG-100873, shouldn't assert:
    const QDate qdteMin(1752, 9, 14); // Used by QDateTimeEdit
    QCOMPARE(qdteMin.startOfDay(UTC).date(), qdteMin);
    QCOMPARE(qdteMin.startOfDay().date(), qdteMin);
#if QT_CONFIG(timezone)
    const QTimeZone sys = QTimeZone::systemTimeZone();
    QVERIFY2(sys.isValid(), "Test depends on properly configured system");
    QCOMPARE(qdteMin.startOfDay(sys).date(), qdteMin);
    QTimeZone berlin("Europe/Berlin");
    if (berlin.isValid())
        QCOMPARE(qdteMin.startOfDay(berlin).date(), qdteMin);
#endif
}

void tst_QDate::julianDaysLimits()
{
    qint64 min = std::numeric_limits<qint64>::min();
    qint64 max = std::numeric_limits<qint64>::max();

    QDate maxDate = QDate::fromJulianDay(maxJd);
    QDate minDate = QDate::fromJulianDay(minJd);
    QDate zeroDate = QDate::fromJulianDay(0);

    QDate dt = QDate::fromJulianDay(min);
    QCOMPARE(dt.isValid(), false);
    dt = QDate::fromJulianDay(minJd - 1);
    QCOMPARE(dt.isValid(), false);
    dt = QDate::fromJulianDay(minJd);
    QCOMPARE(dt.isValid(), true);
    dt = QDate::fromJulianDay(minJd + 1);
    QCOMPARE(dt.isValid(), true);
    dt = QDate::fromJulianDay(maxJd - 1);
    QCOMPARE(dt.isValid(), true);
    dt = QDate::fromJulianDay(maxJd);
    QCOMPARE(dt.isValid(), true);
    dt = QDate::fromJulianDay(maxJd + 1);
    QCOMPARE(dt.isValid(), false);
    dt = QDate::fromJulianDay(max);
    QCOMPARE(dt.isValid(), false);

    dt = maxDate.addDays(1);
    QCOMPARE(dt.isValid(), false);
    dt = maxDate.addDays(0);
    QCOMPARE(dt.isValid(), true);
    dt = maxDate.addDays(-1);
    QCOMPARE(dt.isValid(), true);
    dt = maxDate.addDays(max);
    QCOMPARE(dt.isValid(), false);
    dt = maxDate.addDays(min);
    QCOMPARE(dt.isValid(), false);

    dt = minDate.addDays(-1);
    QCOMPARE(dt.isValid(), false);
    dt = minDate.addDays(0);
    QCOMPARE(dt.isValid(), true);
    dt = minDate.addDays(1);
    QCOMPARE(dt.isValid(), true);
    dt = minDate.addDays(min);
    QCOMPARE(dt.isValid(), false);
    dt = minDate.addDays(max);
    QCOMPARE(dt.isValid(), false);

    dt = zeroDate.addDays(-1);
    QCOMPARE(dt.isValid(), true);
    dt = zeroDate.addDays(0);
    QCOMPARE(dt.isValid(), true);
    dt = zeroDate.addDays(1);
    QCOMPARE(dt.isValid(), true);
    dt = zeroDate.addDays(min);
    QCOMPARE(dt.isValid(), false);
    dt = zeroDate.addDays(max);
    QCOMPARE(dt.isValid(), false);
}

void tst_QDate::addDays()
{
    QFETCH( int, year );
    QFETCH( int, month );
    QFETCH( int, day );
    QFETCH( int, amountToAdd );
    QFETCH( int, expectedYear );
    QFETCH( int, expectedMonth );
    QFETCH( int, expectedDay );

    QDate dt( year, month, day );
    QDate dt2 = dt.addDays( amountToAdd );

    QCOMPARE( dt2.year(), expectedYear );
    QCOMPARE( dt2.month(), expectedMonth );
    QCOMPARE( dt2.day(), expectedDay );

#if __cpp_lib_chrono >= 201907L
    QDate dt3 = dt.addDuration( std::chrono::days( amountToAdd ) );

    QCOMPARE( dt3.year(), expectedYear );
    QCOMPARE( dt3.month(), expectedMonth );
    QCOMPARE( dt3.day(), expectedDay );
#endif
}

void tst_QDate::addDays_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("amountToAdd");
    QTest::addColumn<int>("expectedYear");
    QTest::addColumn<int>("expectedMonth");
    QTest::addColumn<int>("expectedDay");

    QTest::newRow( "data0" ) << 2000 << 1 << 1 << 1 << 2000 << 1 << 2;
    QTest::newRow( "data1" ) << 2000 << 1 << 31 << 1 << 2000 << 2 << 1;
    QTest::newRow( "data2" ) << 2000 << 2 << 28 << 1 << 2000 << 2 << 29;
    QTest::newRow( "data3" ) << 2000 << 2 << 29 << 1 << 2000 << 3 << 1;
    QTest::newRow( "data4" ) << 2000 << 12 << 31 << 1 << 2001 << 1 << 1;
    QTest::newRow( "data5" ) << 2001 << 2 << 28 << 1 << 2001 << 3 << 1;
    QTest::newRow( "data6" ) << 2001 << 2 << 28 << 30 << 2001 << 3 << 30;
    QTest::newRow( "data7" ) << 2001 << 3 << 30 << 5 << 2001 << 4 << 4;

    QTest::newRow( "data8" ) << 2000 << 1 << 1 << -1 << 1999 << 12 << 31;
    QTest::newRow( "data9" ) << 2000 << 1 << 31 << -1 << 2000 << 1 << 30;
    QTest::newRow( "data10" ) << 2000 << 2 << 28 << -1 << 2000 << 2 << 27;
    QTest::newRow( "data11" ) << 2001 << 2 << 28 << -30 << 2001 << 1 << 29;

    QTest::newRow( "data12" ) << -4713 << 1 << 2 << -2 << -4714 << 12 << 31;
    QTest::newRow( "data13" ) << -4713 << 1 << 2 <<  2 << -4713 <<  1 <<  4;

    QTest::newRow( "invalid" ) << 0 << 0 << 0 << 1 << 0 << 0 << 0;
}

void tst_QDate::addMonths()
{
    QFETCH( int, year );
    QFETCH( int, month );
    QFETCH( int, day );
    QFETCH( int, amountToAdd );
    QFETCH( int, expectedYear );
    QFETCH( int, expectedMonth );
    QFETCH( int, expectedDay );

    QDate dt( year, month, day );
    dt = dt.addMonths( amountToAdd );

    QCOMPARE( dt.year(), expectedYear );
    QCOMPARE( dt.month(), expectedMonth );
    QCOMPARE( dt.day(), expectedDay );
}

void tst_QDate::addMonths_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("amountToAdd");
    QTest::addColumn<int>("expectedYear");
    QTest::addColumn<int>("expectedMonth");
    QTest::addColumn<int>("expectedDay");

    QTest::newRow( "data0" ) << 2000 << 1 << 1 << 1 << 2000 << 2 << 1;
    QTest::newRow( "data1" ) << 2000 << 1 << 31 << 1 << 2000 << 2 << 29;
    QTest::newRow( "data2" ) << 2000 << 2 << 28 << 1 << 2000 << 3 << 28;
    QTest::newRow( "data3" ) << 2000 << 2 << 29 << 1 << 2000 << 3 << 29;
    QTest::newRow( "data4" ) << 2000 << 12 << 31 << 1 << 2001 << 1 << 31;
    QTest::newRow( "data5" ) << 2001 << 2 << 28 << 1 << 2001 << 3 << 28;
    QTest::newRow( "data6" ) << 2001 << 2 << 28 << 12 << 2002 << 2 << 28;
    QTest::newRow( "data7" ) << 2000 << 2 << 29 << 12 << 2001 << 2 << 28;
    QTest::newRow( "data8" ) << 2000 << 10 << 15 << 4 << 2001 << 2 << 15;

    QTest::newRow( "data9" ) << 2000 << 1 << 1 << -1 << 1999 << 12 << 1;
    QTest::newRow( "data10" ) << 2000 << 1 << 31 << -1 << 1999 << 12 << 31;
    QTest::newRow( "data11" ) << 2000 << 12 << 31 << -1 << 2000 << 11 << 30;
    QTest::newRow( "data12" ) << 2001 << 2 << 28 << -12 << 2000 << 2 << 28;
    QTest::newRow( "data13" ) << 2000 << 1 << 31 << -7 << 1999 << 6 << 30;
    QTest::newRow( "data14" ) << 2000 << 2 << 29 << -12 << 1999 << 2 << 28;

    // year sign change:
    QTest::newRow( "data15" ) << 1 << 1 << 1 << -1 << -1 << 12 << 1;
    QTest::newRow( "data16" ) << 1 << 1 << 1 << -12 << -1 << 1 << 1;
    QTest::newRow( "data17" ) << -1 << 12 << 1 << 1 << 1 << 1 << 1;
    QTest::newRow( "data18" ) << -1 << 1 << 1 << 12 << 1 << 1 << 1;
    QTest::newRow( "data19" ) << -2 << 1 << 1 << 12 << -1 << 1 << 1;

    QTest::newRow( "invalid" ) << 0 << 0 << 0 << 1 << 0 << 0 << 0;
}

void tst_QDate::addYears()
{
    QFETCH( int, year );
    QFETCH( int, month );
    QFETCH( int, day );
    QFETCH( int, amountToAdd );
    QFETCH( int, expectedYear );
    QFETCH( int, expectedMonth );
    QFETCH( int, expectedDay );

    QDate dt( year, month, day );
    dt = dt.addYears( amountToAdd );

    QCOMPARE( dt.year(), expectedYear );
    QCOMPARE( dt.month(), expectedMonth );
    QCOMPARE( dt.day(), expectedDay );
}

void tst_QDate::addYears_data()
{
    QTest::addColumn<int>("year");
    QTest::addColumn<int>("month");
    QTest::addColumn<int>("day");
    QTest::addColumn<int>("amountToAdd");
    QTest::addColumn<int>("expectedYear");
    QTest::addColumn<int>("expectedMonth");
    QTest::addColumn<int>("expectedDay");

    QTest::newRow( "data0" ) << 2000 << 1 << 1 << 1 << 2001 << 1 << 1;
    QTest::newRow( "data1" ) << 2000 << 1 << 31 << 1 << 2001 << 1 << 31;
    QTest::newRow( "data2" ) << 2000 << 2 << 28 << 1 << 2001 << 2 << 28;
    QTest::newRow( "data3" ) << 2000 << 2 << 29 << 1 << 2001 << 2 << 28;
    QTest::newRow( "data4" ) << 2000 << 12 << 31 << 1 << 2001 << 12 << 31;
    QTest::newRow( "data5" ) << 2001 << 2 << 28 << 3 << 2004 << 2 << 28;
    QTest::newRow( "data6" ) << 2000 << 2 << 29 << 4 << 2004 << 2 << 29;

    QTest::newRow( "data7" ) << 2000 << 1 << 31 << -1 << 1999 << 1 << 31;
    QTest::newRow( "data9" ) << 2000 << 2 << 29 << -1 << 1999 << 2 << 28;
    QTest::newRow( "data10" ) << 2000 << 12 << 31 << -1 << 1999 << 12 << 31;
    QTest::newRow( "data11" ) << 2001 << 2 << 28 << -3 << 1998 << 2 << 28;
    QTest::newRow( "data12" ) << 2000 << 2 << 29 << -4 << 1996 << 2 << 29;
    QTest::newRow( "data13" ) << 2000 << 2 << 29 << -5 << 1995 << 2 << 28;

    QTest::newRow( "data14" ) << 2000 << 1 << 1 << -1999 << 1 << 1 << 1;
    QTest::newRow( "data15" ) << 2000 << 1 << 1 << -2000 << -1 << 1 << 1;
    QTest::newRow( "data16" ) << 2000 << 1 << 1 << -2001 << -2 << 1 << 1;
    QTest::newRow( "data17" ) << -2000 << 1 << 1 << 1999 << -1 << 1 << 1;
    QTest::newRow( "data18" ) << -2000 << 1 << 1 << 2000 << 1 << 1 << 1;
    QTest::newRow( "data19" ) << -2000 << 1 << 1 << 2001 << 2 << 1 << 1;

    QTest::newRow( "invalid" ) << 0 << 0 << 0 << 1 << 0 << 0 << 0;
}

void tst_QDate::daysTo()
{
    QDate dt1(2000, 1, 1);
    QDate dt2(2000, 1, 5);
    QCOMPARE(dt1.daysTo(dt2), (qint64) 4);
    QCOMPARE(dt2.daysTo(dt1), (qint64) -4);

    dt1.setDate(0, 0, 0);
    QCOMPARE(dt1.daysTo(dt2), (qint64) 0);
    dt1.setDate(2000, 1, 1);
    dt2.setDate(0, 0, 0);
    QCOMPARE(dt1.daysTo(dt2), (qint64) 0);


    QDate maxDate = QDate::fromJulianDay(maxJd);
    QDate minDate = QDate::fromJulianDay(minJd);
    QDate zeroDate = QDate::fromJulianDay(0);

    QCOMPARE(maxDate.daysTo(minDate), minJd - maxJd);
    QCOMPARE(minDate.daysTo(maxDate), maxJd - minJd);
    QCOMPARE(maxDate.daysTo(zeroDate), -maxJd);
    QCOMPARE(zeroDate.daysTo(maxDate), maxJd);
    QCOMPARE(minDate.daysTo(zeroDate), -minJd);
    QCOMPARE(zeroDate.daysTo(minDate), minJd);
}

void tst_QDate::orderingCompiles()
{
    QTestPrivate::testAllComparisonOperatorsCompile<QDate>();
#if __cpp_lib_chrono >= 201907L
    QTestPrivate::testAllComparisonOperatorsCompile<QDate, std::chrono::year_month_day>();
    QTestPrivate::testAllComparisonOperatorsCompile<QDate, std::chrono::year_month_day_last>();
    QTestPrivate::testAllComparisonOperatorsCompile<QDate, std::chrono::year_month_weekday>();
    QTestPrivate::testAllComparisonOperatorsCompile<QDate, std::chrono::year_month_weekday_last>();
#endif
}

void tst_QDate::operator_eq_eq_data()
{
    QTest::addColumn<QDate>("d1");
    QTest::addColumn<QDate>("d2");
    QTest::addColumn<bool>("expectEqual");

    QTest::newRow("data0") << QDate(2000,1,2) << QDate(2000,1,2) << true;
    QTest::newRow("data1") << QDate(2001,12,5) << QDate(2001,12,5) << true;
    QTest::newRow("data2") << QDate(2001,12,5) << QDate(2001,12,5) << true;
    QTest::newRow("data3") << QDate(2001,12,5) << QDate(2002,12,5) << false;

    QDate date1(1900, 1, 1);
    QDate date2 = date1.addDays(1);
    QDate date3 = date1.addDays(-1);
    QDate date4 = date1.addMonths(1);
    QDate date5 = date1.addMonths(-1);
    QDate date6 = date1.addYears(1);
    QDate date7 = date1.addYears(-1);

    QTest::newRow("data4") << date2 << date3 << false;
    QTest::newRow("data5") << date4 << date5 << false;
    QTest::newRow("data6") << date6 << date7 << false;
    QTest::newRow("data7") << date1 << date2 << false;
    QTest::newRow("data8") << date1 << date3 << false;
    QTest::newRow("data9") << date1 << date4 << false;
    QTest::newRow("data10") << date1 << date5 << false;
    QTest::newRow("data11") << date1 << date6 << false;
    QTest::newRow("data12") << date1 << date7 << false;
}

void tst_QDate::operator_eq_eq()
{
    QFETCH(QDate, d1);
    QFETCH(QDate, d2);
    QFETCH(bool, expectEqual);

    QT_TEST_EQUALITY_OPS(d1, d2, expectEqual);

    if (expectEqual)
        QVERIFY(qHash(d1) == qHash(d2));
}

void tst_QDate::ordering_data()
{
    QTest::addColumn<QDate>("left");
    QTest::addColumn<QDate>("right");
    QTest::addColumn<Qt::strong_ordering>("expectedOrdering");

    QTest::newRow("2000-1-2_vs_2000-1-2")
            << QDate(2000, 1, 2) << QDate(2000, 1, 2) << Qt::strong_ordering::equivalent;
    QTest::newRow("2001-12-4_vs_2001-12-5")
            << QDate(2001, 12, 4) << QDate(2001, 12, 5) << Qt::strong_ordering::less;
    QTest::newRow("2001-11-5_vs_2001-12-5")
            << QDate(2001, 11, 5) << QDate(2001, 12, 5) << Qt::strong_ordering::less;
    QTest::newRow("2000-12-5_vs_2001-12-5")
            << QDate(2000, 12, 5) << QDate(2001, 12, 5) << Qt::strong_ordering::less;
    QTest::newRow("2002-12-5_vs_2001-12-5")
            << QDate(2002, 12, 5) << QDate(2001, 12, 5) << Qt::strong_ordering::greater;
    QTest::newRow("2001-12-5_vs_2001-11-5")
            << QDate(2001, 12, 5) << QDate(2001, 11, 5) << Qt::strong_ordering::greater;
    QTest::newRow("2001-12-6_vs_2001-12-5")
            << QDate(2001, 12, 6) << QDate(2001, 12, 5) << Qt::strong_ordering::greater;
}

void tst_QDate::ordering()
{
    QFETCH(QDate, left);
    QFETCH(QDate, right);
    QFETCH(Qt::strong_ordering, expectedOrdering);

    QT_TEST_ALL_COMPARISON_OPS(left, right, expectedOrdering);
}

void tst_QDate::ordering_chrono_types()
{
#if __cpp_lib_chrono >= 201907L
    using namespace std::chrono;
    QDate friday(2001, 11, 30); // the 5th Friday of November 2001
    // std::chrono::year_month_day
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day(2001y, November, 29d),
                               Qt::strong_ordering::greater);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day(2001y, November, 30d),
                               Qt::strong_ordering::equivalent);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day(2001y, December, 1d),
                               Qt::strong_ordering::less);

    // std::chrono::year_month_day_last
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day_last(2001y, {October / last}),
                               Qt::strong_ordering::greater);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day_last(2001y, {November / last}),
                               Qt::strong_ordering::equivalent);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_day_last(2001y, {December / last}),
                               Qt::strong_ordering::less);

    // std::chrono::year_month_weekday
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_weekday(2001y, November, Thursday[5]),
                               Qt::strong_ordering::greater);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_weekday(2001y, November, Friday[5]),
                               Qt::strong_ordering::equivalent);
    QT_TEST_ALL_COMPARISON_OPS(friday, year_month_weekday(2001y, December, Saturday[1]),
                               Qt::strong_ordering::less);

    // std::chrono::year_month_weekday_last
    QDate thursday(2001, 11, 29); // the last Thursday of November 2001
    QT_TEST_ALL_COMPARISON_OPS(thursday, year_month_weekday_last(2001y, November, Wednesday[last]),
                               Qt::strong_ordering::greater);
    QT_TEST_ALL_COMPARISON_OPS(thursday, year_month_weekday_last(2001y, November, Thursday[last]),
                               Qt::strong_ordering::equivalent);
    QT_TEST_ALL_COMPARISON_OPS(thursday, year_month_weekday_last(2001y, November, Friday[last]),
                               Qt::strong_ordering::less);
#else
    QSKIP("This test requires C++20-level <chrono> support enabled in the standard library.");
#endif // __cpp_lib_chrono >= 201907L
}

Q_DECLARE_METATYPE(QDataStream::Version)

void tst_QDate::operator_insert_extract_data()
{
    QTest::addColumn<QDate>("date");
    QTest::addColumn<QDataStream::Version>("dataStreamVersion");

    QMap<QDataStream::Version, QString> versionsToTest;
    versionsToTest.insert(QDataStream::Qt_1_0, QString::fromLatin1("Qt_1_0"));
    versionsToTest.insert(QDataStream::Qt_2_0, QString::fromLatin1("Qt_2_0"));
    versionsToTest.insert(QDataStream::Qt_2_1, QString::fromLatin1("Qt_2_1"));
    versionsToTest.insert(QDataStream::Qt_3_0, QString::fromLatin1("Qt_3_0"));
    versionsToTest.insert(QDataStream::Qt_3_1, QString::fromLatin1("Qt_3_1"));
    versionsToTest.insert(QDataStream::Qt_3_3, QString::fromLatin1("Qt_3_3"));
    versionsToTest.insert(QDataStream::Qt_4_0, QString::fromLatin1("Qt_4_0"));
    versionsToTest.insert(QDataStream::Qt_4_1, QString::fromLatin1("Qt_4_1"));
    versionsToTest.insert(QDataStream::Qt_4_2, QString::fromLatin1("Qt_4_2"));
    versionsToTest.insert(QDataStream::Qt_4_3, QString::fromLatin1("Qt_4_3"));
    versionsToTest.insert(QDataStream::Qt_4_4, QString::fromLatin1("Qt_4_4"));
    versionsToTest.insert(QDataStream::Qt_4_5, QString::fromLatin1("Qt_4_5"));
    versionsToTest.insert(QDataStream::Qt_4_6, QString::fromLatin1("Qt_4_6"));
    versionsToTest.insert(QDataStream::Qt_4_7, QString::fromLatin1("Qt_4_7"));
    versionsToTest.insert(QDataStream::Qt_4_8, QString::fromLatin1("Qt_4_8"));
    versionsToTest.insert(QDataStream::Qt_4_9, QString::fromLatin1("Qt_4_9"));
    versionsToTest.insert(QDataStream::Qt_5_0, QString::fromLatin1("Qt_5_0"));

    for (QMap<QDataStream::Version, QString>::ConstIterator it = versionsToTest.constBegin();
            it != versionsToTest.constEnd(); ++it) {
        const QString &version(it.value());
        QTest::newRow(("(invalid) " + version).toLocal8Bit().constData()) << invalidDate() << it.key();
        QTest::newRow(("(1, 1, 1) " + version).toLocal8Bit().constData()) << QDate(1, 1, 1) << it.key();
        QTest::newRow(("(-1, 1, 1) " + version).toLocal8Bit().constData()) << QDate(-1, 1, 1) << it.key();
        QTest::newRow(("(1995, 5, 20) " + version).toLocal8Bit().constData()) << QDate(1995, 5, 20) << it.key();

        // Test minimums for quint32/qint64.
        if (it.key() >= QDataStream::Qt_5_0)
            QTest::newRow(("(-4714, 11, 24) " + version).toLocal8Bit().constData()) << QDate(-4714, 11, 24) << it.key();
        else
            QTest::newRow(("(-4713, 1, 2) " + version).toLocal8Bit().constData()) << QDate(-4713, 1, 2) << it.key();
    }
}

void tst_QDate::operator_insert_extract()
{
    QFETCH(QDate, date);
    QFETCH(QDataStream::Version, dataStreamVersion);

    QByteArray byteArray;
    QDataStream dataStream(&byteArray, QIODevice::ReadWrite);
    dataStream.setVersion(dataStreamVersion);
    dataStream << date;
    dataStream.device()->reset();
    QDate deserialised;
    dataStream >> deserialised;
    QCOMPARE(dataStream.status(), QDataStream::Ok);

    QCOMPARE(deserialised, date);
}

#if QT_CONFIG(datetimeparser)
void tst_QDate::fromStringDateFormat_data()
{
    QTest::addColumn<QString>("dateStr");
    QTest::addColumn<Qt::DateFormat>("dateFormat");
    QTest::addColumn<QDate>("expectedDate");

    QTest::newRow("text0") << QString("Sat May 20 1995") << Qt::TextDate << QDate(1995, 5, 20);
    QTest::newRow("text1") << QString("Tue Dec 17 2002") << Qt::TextDate << QDate(2002, 12, 17);
    QTest::newRow("text2") << QDate(1999, 11, 14).toString(Qt::TextDate) << Qt::TextDate << QDate(1999, 11, 14);
    QTest::newRow("text3") << QString("xxx Jan 1 0999") << Qt::TextDate << QDate(999, 1, 1);
    QTest::newRow("text3b") << QString("xxx Jan 1 999") << Qt::TextDate << QDate(999, 1, 1);
    QTest::newRow("text4") << QString("xxx Jan 1 12345") << Qt::TextDate << QDate(12345, 1, 1);
    QTest::newRow("text5") << QString("xxx Jan 1 -0001") << Qt::TextDate << QDate(-1, 1, 1);
    QTest::newRow("text6") << QString("xxx Jan 1 -4712") << Qt::TextDate << QDate(-4712, 1, 1);
    QTest::newRow("text7") << QString("xxx Nov 25 -4713") << Qt::TextDate << QDate(-4713, 11, 25);
    QTest::newRow("text, empty") << QString() << Qt::TextDate << QDate();
    QTest::newRow("text, 3 part") << QString("part1 part2 part3") << Qt::TextDate << QDate();
    QTest::newRow("text, invalid month name") << QString("Wed BabytownFrolics 8 2012") << Qt::TextDate << QDate();
    QTest::newRow("text, invalid day") << QString("Wed May Wilhelm 2012") << Qt::TextDate << QDate();
    QTest::newRow("text, invalid year") << QString("Wed May 8 Cats") << Qt::TextDate << QDate();

    QTest::newRow("iso0") << QString("1995-05-20") << Qt::ISODate << QDate(1995, 5, 20);
    QTest::newRow("iso1") << QString("2002-12-17") << Qt::ISODate << QDate(2002, 12, 17);
    QTest::newRow("iso2") << QDate(1999, 11, 14).toString(Qt::ISODate) << Qt::ISODate << QDate(1999, 11, 14);
    QTest::newRow("iso3") << QString("0999-01-01") << Qt::ISODate << QDate(999, 1, 1);
    QTest::newRow("iso3b") << QString("0999-01-01") << Qt::ISODate << QDate(999, 1, 1);
    QTest::newRow("iso4") << QString("2000101101")      << Qt::ISODate << QDate();
    QTest::newRow("iso5") << QString("2000/01/01")      << Qt::ISODate << QDate(2000, 1, 1);
    QTest::newRow("iso6") << QString("2000-01-01 blah") << Qt::ISODate << QDate(2000, 1, 1);
    QTest::newRow("iso7") << QString("2000-01-011blah") << Qt::ISODate << QDate();
    QTest::newRow("iso8") << QString("2000-01-01blah")  << Qt::ISODate << QDate(2000, 1, 1);
    QTest::newRow("iso9") << QString("-001-01-01")      << Qt::ISODate << QDate();
    QTest::newRow("iso10") << QString("99999-01-01")    << Qt::ISODate << QDate();

    // Test Qt::RFC2822Date format (RFC 2822).
    QTest::newRow("RFC 2822") << QString::fromLatin1("13 Feb 1987 13:24:51 +0100")
        << Qt::RFC2822Date << QDate(1987, 2, 13);
    QTest::newRow("RFC 2822 after space")
        << QString::fromLatin1(" 13 Feb 1987 13:24:51 +0100")
        << Qt::RFC2822Date << QDate(1987, 2, 13);
    QTest::newRow("RFC 2822 with day") << QString::fromLatin1("Thu, 01 Jan 1970 00:12:34 +0000")
        << Qt::RFC2822Date << epochDate();
    QTest::newRow("RFC 2822 with day after space")
        << QString::fromLatin1(" Thu, 01 Jan 1970 00:12:34 +0000")
        << Qt::RFC2822Date << epochDate();
    // No timezone
    QTest::newRow("RFC 2822 no timezone") << QString::fromLatin1("01 Jan 1970 00:12:34")
        << Qt::RFC2822Date << epochDate();
    // No time specified
    QTest::newRow("RFC 2822 date only") << QString::fromLatin1("01 Nov 2002")
        << Qt::RFC2822Date << QDate(2002, 11, 1);
    QTest::newRow("RFC 2822 with day date only") << QString::fromLatin1("Fri, 01 Nov 2002")
        << Qt::RFC2822Date << QDate(2002, 11, 1);
    QTest::newRow("RFC 2822 malformed time")
        << QString::fromLatin1("01 Nov 2002 0:") << Qt::RFC2822Date << QDate();
    // Test invalid month, day, year
    QTest::newRow("RFC 2822 invalid month name") << QString::fromLatin1("13 Fev 1987 13:24:51 +0100")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid day") << QString::fromLatin1("36 Fev 1987 13:24:51 +0100")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid year") << QString::fromLatin1("13 Fev 0000 13:24:51 +0100")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid character at end")
        << QString::fromLatin1("01 Jan 2012 08:00:00 +0100!") << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid character at front")
        << QString::fromLatin1("!01 Jan 2012 08:00:00 +0100") << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid character both ends")
        << QString::fromLatin1("!01 Jan 2012 08:00:00 +0100!") << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid character at front, 2 at back")
        << QString::fromLatin1("!01 Jan 2012 08:00:00 +0100..") << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 2822 invalid character 2 at front")
        << QString::fromLatin1("!!01 Jan 2012 08:00:00 +0100") << Qt::RFC2822Date << QDate();
    // The common date text used by the "invalid character" tests, just to be
    // sure *it's* not what's invalid:
    QTest::newRow("RFC 2822 (not invalid)")
        << QString::fromLatin1("01 Jan 2012 08:00:00 +0100")
        << Qt::RFC2822Date << QDate(2012, 1, 1);

    // Test Qt::RFC2822Date format (RFC 850 and 1036, permissive).
    QTest::newRow("RFC 850 and 1036") << QString::fromLatin1("Fri Feb 13 13:24:51 1987 +0100")
        << Qt::RFC2822Date << QDate(1987, 2, 13);
    QTest::newRow("RFC 850 and 1036 after space")
        << QString::fromLatin1(" Fri Feb 13 13:24:51 1987 +0100")
        << Qt::RFC2822Date << QDate(1987, 2, 13);
    // No timezone
    QTest::newRow("RFC 850 and 1036 no timezone") << QString::fromLatin1("Thu Jan 01 00:12:34 1970")
        << Qt::RFC2822Date << epochDate();
    // No time specified
    QTest::newRow("RFC 850 and 1036 date only") << QString::fromLatin1("Fri Nov 01 2002")
        << Qt::RFC2822Date << QDate(2002, 11, 1);
    // Test invalid characters.
    QTest::newRow("RFC 850 and 1036 invalid character at end")
        << QString::fromLatin1("Sun Jan 01 08:00:00 2012 +0100!")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 850 and 1036 invalid character at front")
        << QString::fromLatin1("!Sun Jan 01 08:00:00 2012 +0100")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 850 and 1036 invalid character both ends")
        << QString::fromLatin1("!Sun Jan 01 08:00:00 2012 +0100!")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 850 and 1036 invalid character at front, 2 at back")
        << QString::fromLatin1("!Sun Jan 01 08:00:00 2012 +0100..")
        << Qt::RFC2822Date << QDate();
    QTest::newRow("RFC 850 and 1036 invalid character 2 at front")
        << QString::fromLatin1("!!Sun Jan 01 08:00:00 2012 +0100")
        << Qt::RFC2822Date << QDate();
    // Again, check the text in the "invalid character" tests isn't the source of invalidity:
    QTest::newRow("RFC 850 and 1036 (not invalid)")
        << QString::fromLatin1("Sun Jan 01 08:00:00 2012 +0100")
        << Qt::RFC2822Date << QDate(2012, 1, 1);

    QTest::newRow("RFC empty") << QString::fromLatin1("") << Qt::RFC2822Date << QDate();
}

void tst_QDate::fromStringDateFormat()
{
    QFETCH(QString, dateStr);
    QFETCH(Qt::DateFormat, dateFormat);
    QFETCH(QDate, expectedDate);

    QCOMPARE(QDate::fromString(dateStr, dateFormat), expectedDate);
}

void tst_QDate::fromStringFormat_data()
{
    QTest::addColumn<QString>("string");
    QTest::addColumn<QString>("format");
    QTest::addColumn<int>("baseYear");
    QTest::addColumn<QDate>("expected");

    QTest::newRow("empty") << u""_s << u""_s << 1900 << defDate();
    QTest::newRow("space-as-empty") << u" "_s << u""_s << 1900 << invalidDate();
    QTest::newRow("space") << u" "_s << u" "_s << 1900 << defDate();
    QTest::newRow("mispunc") << u"-%$%#"_s << u"$*(#@"_s << 1900 << invalidDate();
    QTest::newRow("literal-d") << u"d"_s << u"'d'"_s << 1900 << defDate();
    QTest::newRow("greedy") << u"101010"_s << u"dMyy"_s << 1900 << QDate(1910, 10, 10);
    QTest::newRow("greedy-miss") << u"101010b"_s << u"dMyy"_s << 1900 << invalidDate();
    QTest::newRow("January") << u"January"_s << u"MMMM"_s << 1900 << defDate();
    QTest::newRow("mistext") << u"ball"_s << u"balle"_s << 1900 << invalidDate();
    QTest::newRow("text") << u"balleh"_s << u"balleh"_s << 1900 << defDate();
    QTest::newRow("yearless:19") << u"10.01.1"_s << u"M.dd.d"_s << 1900 << QDate(1900, 10, 1);
    QTest::newRow("yearless:20") << u"10.01.1"_s << u"M.dd.d"_s << 2000 << QDate(2000, 10, 1);
    QTest::newRow("neg-month") << u"-1.01.1"_s << u"M.dd.d"_s << 1900 << invalidDate();
    QTest::newRow("greedy-break") << u"11010"_s << u"dMMyy"_s << 1900 << invalidDate();
    QTest::newRow("neg-day") << u"-2"_s << u"d"_s << 1900 << invalidDate();
    QTest::newRow("Md:132") << u"132"_s << u"Md"_s << 1900 << invalidDate();
    QTest::newRow("February") << u"February"_s << u"MMMM"_s << 1900 << QDate(1900, 2, 1);

    QTest::newRow("mon-aug-8th")
            << u"Mon August 8 2005"_s << u"ddd MMMM d yyyy"_s << 1900 << QDate(2005, 8, 8);
    QTest::newRow("year-match-20000") << u"2000:00"_s << u"yyyy:yy"_s << 1900 << QDate(2000, 1, 1);
    QTest::newRow("year-match-1999") << u"1999:99"_s << u"yyyy:yy"_s << 1900 << QDate(1999, 1, 1);
    QTest::newRow("year-match-2099") << u"2099:99"_s << u"yyyy:yy"_s << 1900 << QDate(2099, 1, 1);
    QTest::newRow("year-match-2001") << u"2001:01"_s << u"yyyy:yy"_s << 1900 << QDate(2001, 1, 1);
    QTest::newRow("year-match-1999") << u"99"_s << u"yy"_s << 1900 << QDate(1999, 1, 1);
    QTest::newRow("just-yy-1901") << u"01"_s << u"yy"_s << 1900 << QDate(1901, 1, 1);
    QTest::newRow("just-yy-2001") << u"01"_s << u"yy"_s << 1970 << QDate(2001, 1, 1);

    QTest::newRow("Monday") << u"Monday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 1);
    QTest::newRow("Tuesday") << u"Tuesday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 2);
    QTest::newRow("Wednesday") << u"Wednesday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 3);
    QTest::newRow("Thursday") << u"Thursday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 4);
    QTest::newRow("Friday") << u"Friday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 5);
    QTest::newRow("Saturday") << u"Saturday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 6);
    QTest::newRow("Sunday") << u"Sunday"_s << u"dddd"_s << 1900 << QDate(1900, 1, 7);

    QTest::newRow("Mon06") << u"Monday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 2);
    QTest::newRow("Tues06") << u"Tuesday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 3);
    QTest::newRow("Wed06") << u"Wednesday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 4);
    QTest::newRow("Thu06") << u"Thursday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 5);
    QTest::newRow("Fri06") << u"Friday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 6);
    QTest::newRow("Sat06") << u"Saturday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 7);
    QTest::newRow("Sun06") << u"Sunday 2006"_s << u"dddd yyyy"_s << 1900 << QDate(2006, 1, 1);
    QTest::newRow("Tue07Mar")
            << u"Tuesday 2007 March"_s << u"dddd yyyy MMMM"_s << 1900 << QDate(2007, 3, 6);

    QTest::newRow("21May2006")
            << u"21052006"_s << u"ddMMyyyy"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("21May06:19")
            << u"210506"_s << u"ddMMyy"_s << 1900 << QDate(1906, 5, 21);
    QTest::newRow("21May06:20")
            << u"210506"_s << u"ddMMyy"_s << 1970 << QDate(2006, 5, 21);
    QTest::newRow("21/May/2006")
            << u"21/5/2006"_s << u"d/M/yyyy"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("21/5/06")
            << u"21/5/06"_s << u"d/M/yy"_s << 1900 << QDate(1906, 5, 21);
    QTest::newRow("21/5/06:19")
            << u"21/5/06"_s << u"d/M/yy"_s << 1900 << QDate(1906, 5, 21);
    QTest::newRow("21/5/06:20")
            << u"21/5/06"_s << u"d/M/yy"_s << 1910 << QDate(2006, 5, 21);
    QTest::newRow("2006May21")
            << u"20060521"_s << u"yyyyMMdd"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("06May21:19")
            << u"060521"_s << u"yyMMdd"_s << 1900 << QDate(1906, 5, 21);
    QTest::newRow("06May21:20")
            << u"060521"_s << u"yyMMdd"_s << 1907 << QDate(2006, 5, 21);
    QTest::newRow("lateMarch")
            << u"9999-03-06"_s << u"yyyy-MM-dd"_s << 1900 << QDate(9999, 3, 6);
    QTest::newRow("late")
            << u"9999-12-31"_s << u"yyyy-MM-dd"_s << 1900 << QDate(9999, 12, 31);

    QTest::newRow("quoted-dd")
            << u"21dd-05-2006"_s << u"dd'dd'-MM-yyyy"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("quoted-MM")
            << u"21-MM05-2006"_s << u"dd-'MM'MM-yyyy"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("quotes-empty")
            << u"21-'05-2006"_s << u"dd-MM-''yy"_s << 1900 << QDate(2006, 5, 21);

    // Test unicode handling.
    QTest::newRow("Unicode in format string")
            << QString(u8"2020🤣09🤣21") << QString(u8"yyyy🤣MM🤣dd") << 1900 << QDate(2020, 9, 21);
    QTest::newRow("Unicode-in-format-string-quoted-emoji")
            << QString(u8"🤣🤣2020👍09🤣21") << QString(u8"'🤣🤣'yyyy👍MM🤣dd") << 1900
            << QDate(2020, 9, 21);
    QTest::newRow("Unicode-in-quoted-dd-format-string")
            << QString(u8"🤣🤣2020👍09🤣21dd") << QString(u8"🤣🤣yyyy👍MM🤣dd'dd'") << 1900
            << QDate(2020, 9, 21);
    QTest::newRow("Unicode-in-all-formats-quoted-string")
            << QString(u8"🤣🤣yyyy2020👍MM09🤣21dd") << QString(u8"🤣🤣'yyyy'yyyy👍'MM'MM🤣dd'dd'")
            << 1900 << QDate(2020, 9, 21);

    // QTBUG-84334
    QTest::newRow("-ve year: front, nosep")
            << u"-20060521"_s << u"yyyyMMdd"_s << 1900 << QDate(-2006, 5, 21);
    QTest::newRow("-ve year: mid, nosep")
            << u"05-200621"_s << u"MMyyyydd"_s << 1900 << QDate(-2006, 5, 21);
    QTest::newRow("-ve year: back, nosep")
            << u"0521-2006"_s << u"MMddyyyy"_s << 1900 << QDate(-2006, 5, 21);
    // - as separator should not interfere with negative year numbers:
    QTest::newRow("-ve year: front, dash")
            << u"-2006-05-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate(-2006, 5, 21);
    QTest::newRow("positive year: front, dash")
            << u"-2006-05-21"_s << u"-yyyy-MM-dd"_s << 1900 << QDate(2006, 5, 21);
    QTest::newRow("-ve year: mid, dash")
            << u"05--2006-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate(-2006, 5, 21);
    QTest::newRow("-ve year: back, dash")
            << u"05-21--2006"_s << u"MM-dd-yyyy"_s << 1900 << QDate(-2006, 5, 21);
    // negative three digit year numbers should be rejected:
    QTest::newRow("-ve 3digit year: front")
            << u"-206-05-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 3digit year: mid")
            << u"05--206-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 3digit year: back")
            << u"05-21--206"_s << u"MM-dd-yyyy"_s << 1900 << QDate();
    // negative month numbers should be rejected:
    QTest::newRow("-ve 2digit month: mid")
            << u"2060--05-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 2digit month: front")
            << u"-05-2060-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 2digit month: back")
            << u"21-2060--05"_s << u"dd-yyyy-MM"_s << 1900 << QDate();
    // negative single digit month numbers should be rejected:
    QTest::newRow("-ve 1digit month: mid")
            << u"2060--5-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 1digit month: front")
            << u"-5-2060-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    QTest::newRow("-ve 1digit month: back")
            << u"21-2060--5"_s << u"dd-yyyy-MM"_s << 1900 << QDate();
    // negative day numbers should be rejected:
    QTest::newRow("-ve 2digit day: front")
            << u"-21-2060-05"_s << u"dd-yyyy-MM"_s << 1900 << QDate();
    QTest::newRow("-ve 2digit day: mid")
            << u"2060--21-05"_s << u"yyyy-dd-MM"_s << 1900 << QDate();
    QTest::newRow("-ve 2digit day: back")
            << u"05-2060--21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    // negative single digit day numbers should be rejected:
    QTest::newRow("-ve 1digit day: front")
            << u"-2-2060-05"_s << u"dd-yyyy-MM"_s << 1900 << QDate();
    QTest::newRow("-ve 1digit day: mid")
            << u"05--2-2060"_s << u"MM-dd-yyyy"_s << 1900 << QDate();
    QTest::newRow("-ve 1digit day: back")
            << u"2060-05--2"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    // positive three digit year numbers should be rejected:
    QTest::newRow("3digit year, front") << u"206-05-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    QTest::newRow("3digit year, mid") << u"05-206-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    QTest::newRow("3digit year, back") << u"05-21-206"_s << u"MM-dd-yyyy"_s << 1900 << QDate();
    // positive five digit year numbers should be rejected:
    QTest::newRow("5digit year, front")
            << u"00206-05-21"_s << u"yyyy-MM-dd"_s << 1900 << QDate();
    QTest::newRow("5digit year, mid")
            << u"05-00206-21"_s << u"MM-yyyy-dd"_s << 1900 << QDate();
    QTest::newRow("5digit year, back")
            << u"05-21-00206"_s << u"MM-dd-yyyy"_s << 1900 << QDate();

    QTest::newRow("dash separator, no year at end")
            << u"05-21-"_s << u"dd-MM-yyyy"_s << 1900 << QDate();
    QTest::newRow("slash separator, no year at end")
            << u"11/05/"_s << u"d/MM/yyyy"_s << 1900 << QDate();

    // QTBUG-84349
    QTest::newRow("+ sign in year field") << u"+0200322"_s << u"yyyyMMdd"_s << 1900 << QDate();
    QTest::newRow("+ sign in month field") << u"2020+322"_s << u"yyyyMMdd"_s << 1900 << QDate();
    QTest::newRow("+ sign in day field") << u"202003+1"_s << u"yyyyMMdd"_s << 1900 << QDate();
}


void tst_QDate::fromStringFormat()
{
    QFETCH(QString, string);
    QFETCH(QString, format);
    QFETCH(int, baseYear);
    QFETCH(QDate, expected);

    QDate dt = QDate::fromString(string, format, baseYear);
    QEXPECT_FAIL("quotes-empty", "QTBUG-110669: doubled single-quotes in format mishandled",
                 Continue);
    QCOMPARE(dt, expected);
}
#endif // datetimeparser

#if QT_CONFIG(datestring)
void tst_QDate::toStringFormat_data()
{
    QTest::addColumn<QDate>("t");
    QTest::addColumn<QString>("format");
    QTest::addColumn<QString>("str");

    QTest::newRow( "data0" ) << QDate(1995,5,20) << QString("d-M-yy") << QString("20-5-95");
    QTest::newRow( "data1" ) << QDate(2002,12,17) << QString("dd-MM-yyyy") << QString("17-12-2002");
    QTest::newRow( "data2" ) << QDate(1995,5,20) << QString("M-yy") << QString("5-95");
    QTest::newRow( "data3" ) << QDate(2002,12,17) << QString("dd") << QString("17");
    QTest::newRow( "data4" ) << QDate() << QString("dd-mm-yyyy") << QString();
}

void tst_QDate::toStringFormat()
{
    QFETCH( QDate, t );
    QFETCH( QString, format );
    QFETCH( QString, str );

    QCOMPARE( t.toString( format ), str );
}

void tst_QDate::toStringDateFormat_data()
{
    QTest::addColumn<QDate>("date");
    QTest::addColumn<Qt::DateFormat>("format");
    QTest::addColumn<QString>("expectedStr");

    QTest::newRow("data0") << QDate(1,1,1) << Qt::ISODate << QString("0001-01-01");
    QTest::newRow("data1") << QDate(11,1,1) << Qt::ISODate << QString("0011-01-01");
    QTest::newRow("data2") << QDate(111,1,1) << Qt::ISODate << QString("0111-01-01");
    QTest::newRow("data3") << QDate(1974,12,1) << Qt::ISODate << QString("1974-12-01");
    QTest::newRow("year < 0") << QDate(-1,1,1) << Qt::ISODate << QString();
    QTest::newRow("year > 9999") << QDate(10000, 1, 1) << Qt::ISODate << QString();
    QTest::newRow("RFC2822Date") << QDate(1974,12,1) << Qt::RFC2822Date << QString("01 Dec 1974");
    QTest::newRow("ISODateWithMs") << QDate(1974,12,1) << Qt::ISODateWithMs << QString("1974-12-01");
}

void tst_QDate::toStringDateFormat()
{
    QFETCH(QDate, date);
    QFETCH(Qt::DateFormat, format);
    QFETCH(QString, expectedStr);

    QCOMPARE(date.toString(format), expectedStr);
}
#endif // datestring

void tst_QDate::isLeapYear()
{
    QVERIFY(QDate::isLeapYear(-4801));
    QVERIFY(!QDate::isLeapYear(-4800));
    QVERIFY(QDate::isLeapYear(-4445));
    QVERIFY(!QDate::isLeapYear(-4444));
    QVERIFY(!QDate::isLeapYear(-6));
    QVERIFY(QDate::isLeapYear(-5));
    QVERIFY(!QDate::isLeapYear(-4));
    QVERIFY(!QDate::isLeapYear(-3));
    QVERIFY(!QDate::isLeapYear(-2));
    QVERIFY(QDate::isLeapYear(-1));
    QVERIFY(!QDate::isLeapYear(0)); // Doesn't exist
    QVERIFY(!QDate::isLeapYear(1));
    QVERIFY(!QDate::isLeapYear(2));
    QVERIFY(!QDate::isLeapYear(3));
    QVERIFY(QDate::isLeapYear(4));
    QVERIFY(!QDate::isLeapYear(7));
    QVERIFY(QDate::isLeapYear(8));
    QVERIFY(!QDate::isLeapYear(100));
    QVERIFY(QDate::isLeapYear(400));
    QVERIFY(!QDate::isLeapYear(700));
    QVERIFY(!QDate::isLeapYear(1500));
    QVERIFY(QDate::isLeapYear(1600));
    QVERIFY(!QDate::isLeapYear(1700));
    QVERIFY(!QDate::isLeapYear(1800));
    QVERIFY(!QDate::isLeapYear(1900));
    QVERIFY(QDate::isLeapYear(2000));
    QVERIFY(!QDate::isLeapYear(2100));
    QVERIFY(!QDate::isLeapYear(2200));
    QVERIFY(!QDate::isLeapYear(2300));
    QVERIFY(QDate::isLeapYear(2400));
    QVERIFY(!QDate::isLeapYear(2500));
    QVERIFY(!QDate::isLeapYear(2600));
    QVERIFY(!QDate::isLeapYear(2700));
    QVERIFY(QDate::isLeapYear(2800));

    for (int i = -4713; i <= 10000; ++i) {
        if (i == 0)
            continue;
        QVERIFY(!QDate(i, 2, 29).isValid() == !QDate::isLeapYear(i));
    }
}

void tst_QDate::yearsZeroToNinetyNine()
{
    {
        QDate dt(-1, 2, 3);
        QCOMPARE(dt.year(), -1);
        QCOMPARE(dt.month(), 2);
        QCOMPARE(dt.day(), 3);
    }

    {
        QDate dt(1, 2, 3);
        QCOMPARE(dt.year(), 1);
        QCOMPARE(dt.month(), 2);
        QCOMPARE(dt.day(), 3);
    }

    {
        QDate dt(99, 2, 3);
        QCOMPARE(dt.year(), 99);
        QCOMPARE(dt.month(), 2);
        QCOMPARE(dt.day(), 3);
    }

    QVERIFY(!QDate::isValid(0, 2, 3));
    QVERIFY(QDate::isValid(1, 2, 3));
    QVERIFY(QDate::isValid(-1, 2, 3));

    {
        QDate dt;
        dt.setDate(1, 2, 3);
        QCOMPARE(dt.year(), 1);
        QCOMPARE(dt.month(), 2);
        QCOMPARE(dt.day(), 3);

        dt.setDate(0, 2, 3);
        QVERIFY(!dt.isValid());
    }
}

void tst_QDate::printNegativeYear_data() const
{
    QTest::addColumn<int>("year");
    QTest::addColumn<QString>("expect");
    QTest::newRow("millennium") << -1000 << QStringLiteral("-1000");
    QTest::newRow("century") << -500 << QStringLiteral("-0500");
    QTest::newRow("decade") << -20 << QStringLiteral("-0020");
    QTest::newRow("year") << -7 << QStringLiteral("-0007");
}

void tst_QDate::printNegativeYear() const
{
    QFETCH(int, year);
    QFETCH(QString, expect);
    expect.replace(QLatin1Char('-'), QLocale().negativeSign());

    QDate date(year, 3, 4);
    QVERIFY(date.isValid());
    QCOMPARE(date.year(), year);
    QCOMPARE(date.toString(QLatin1String("yyyy")), expect);
}

#if QT_CONFIG(datestring)
void tst_QDate::roundtripString() const
{
    /* This code path should not result in warnings. */
    const QDate date(QDate::currentDate());
    QCOMPARE(date.fromString(date.toString(Qt::TextDate), Qt::TextDate), date);

    const QDateTime now(QDateTime::currentDateTime());
    // TextDate discards milliseconds, so clip to whole second:
    const QDateTime when = now.addMSecs(-now.time().msec());
    QCOMPARE(when.fromString(when.toString(Qt::TextDate), Qt::TextDate), when);
}
#endif

void tst_QDate::roundtrip() const
{
    // Test round trip, this exercises setDate(), isValid(), isLeapYear(),
    // year(), month(), day(), julianDayFromDate(), and getDateFromJulianDay()
    // to ensure they are internally consistent (but doesn't guarantee correct)

    // Test Julian round trip around JD 0 and the c++ integer division rounding
    // problem point (eg. negative numbers) in the conversion functions.
    QDate testDate;
    QDate loopDate = QDate::fromJulianDay(-50001); // 1 Jan 4850 BC
    while (loopDate.toJulianDay() <= 5150) {     // 31 Dec 4700 BC
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(1);
    }

    // Test Julian round trip in both BC and AD
    loopDate = QDate::fromJulianDay(1684901);       //  1 Jan 100 BC
    while (loopDate.toJulianDay() <= 1757949) {   // 31 Dec 100 AD
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(1);
    }

    // Test Gregorian round trip during current useful period
    loopDate = QDate::fromJulianDay(2378497);     //  1 Jan 1900 AD
    while (loopDate.toJulianDay() <= 2488433) { // 31 Dec 2100 AD
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(1);
    }

    // Test Gregorian round trip at top end of widget/format range
    loopDate = QDate::fromJulianDay(5336961);     //  1 Jan 9900 AD
    while (loopDate.toJulianDay() <= 5373484) { // 31 Dec 9999 AD
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(1);
    }

    // Test Gregorian round trip at top end of conversion range
    loopDate = QDate::fromJulianDay(maxJd);
    while (loopDate.toJulianDay() >= maxJd - 146397) {
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(-1);
    }

    // Test Gregorian round trip at low end of conversion range
    loopDate = QDate::fromJulianDay(minJd);
    while (loopDate.toJulianDay() <= minJd + 146397) {
        testDate.setDate(loopDate.year(), loopDate.month(), loopDate.day());
        QCOMPARE(loopDate.toJulianDay(), testDate.toJulianDay());
        loopDate = loopDate.addDays(1);
    }

#if __cpp_lib_chrono >= 201907L
    // Test roundtrip for from/to std::chrono conversions.
    // Compile-time test, to verify it's all constexpr.
    using namespace std::chrono;
    {
        constexpr sys_days expected{days{minJd}};
        constexpr sys_days actual{QDate::fromStdSysDays(expected).toStdSysDays()};
        static_assert(actual == expected);
    }
    {
        // constexpr year_month_day expected{sys_days{days{maxJd}}}; // Overflow at least on MSVC
        constexpr year_month_day expected{1970y, January, 1d};
        constexpr sys_days actual{QDate(expected).toStdSysDays()};
        static_assert(actual == sys_days(expected));
    }
    {
        constexpr year_month_day_last expected{2001y, {October / last}};
        constexpr sys_days actual{QDate(expected).toStdSysDays()};
        static_assert(actual == sys_days(expected));
    }
    {
        constexpr year_month_weekday expected{2001y, December, Saturday[1]};
        constexpr sys_days actual{QDate(expected).toStdSysDays()};
        static_assert(actual == sys_days(expected));
    }
    {
        constexpr year_month_weekday_last expected{2001y, November, Friday[last]};
        constexpr sys_days actual{QDate(expected).toStdSysDays()};
        static_assert(actual == sys_days(expected));
    }
#endif // __cpp_lib_chrono >= 201907L
}

void tst_QDate::qdebug() const
{
    QTest::ignoreMessage(QtDebugMsg, "QDate(Invalid)");
    qDebug() << QDate();
    QTest::ignoreMessage(QtDebugMsg, "QDate(\"1983-08-07\")");
    qDebug() << QDate(1983, 8, 7);
}

QTEST_APPLESS_MAIN(tst_QDate)
#include "tst_qdate.moc"