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0001 // Copyright (C) 2021 The Qt Company Ltd.
0002 // Copyright (C) 2021 Intel Corporation.
0003 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
0004 
0005 #ifndef QDATETIME_H
0006 #define QDATETIME_H
0007 
0008 #include <QtCore/qcalendar.h>
0009 #include <QtCore/qcompare.h>
0010 #include <QtCore/qlocale.h>
0011 #include <QtCore/qnamespace.h>
0012 #include <QtCore/qshareddata.h>
0013 #include <QtCore/qstring.h>
0014 
0015 #include <limits>
0016 #include <chrono>
0017 
0018 #if defined(Q_OS_DARWIN) || defined(Q_QDOC)
0019 Q_FORWARD_DECLARE_CF_TYPE(CFDate);
0020 Q_FORWARD_DECLARE_OBJC_CLASS(NSDate);
0021 #endif
0022 
0023 QT_BEGIN_NAMESPACE
0024 
0025 class QTimeZone;
0026 class QDateTime;
0027 
0028 class Q_CORE_EXPORT QDate
0029 {
0030     explicit constexpr QDate(qint64 julianDay) : jd(julianDay) {}
0031 public:
0032     constexpr QDate() : jd(nullJd()) {}
0033     QDate(int y, int m, int d);
0034     QDate(int y, int m, int d, QCalendar cal);
0035 // INTEGRITY incident-85878 (timezone and clock_cast are not supported)
0036 #if (__cpp_lib_chrono >= 201907L && !defined(Q_OS_INTEGRITY)) || defined(Q_QDOC)
0037     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0038     Q_IMPLICIT constexpr QDate(std::chrono::year_month_day date) noexcept
0039         : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
0040     {}
0041 
0042     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0043     Q_IMPLICIT constexpr QDate(std::chrono::year_month_day_last date) noexcept
0044         : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
0045     {}
0046 
0047     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0048     Q_IMPLICIT constexpr QDate(std::chrono::year_month_weekday date) noexcept
0049         : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
0050     {}
0051 
0052     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0053     Q_IMPLICIT constexpr QDate(std::chrono::year_month_weekday_last date) noexcept
0054         : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
0055     {}
0056 
0057     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0058     static constexpr QDate fromStdSysDays(const std::chrono::sys_days &days) noexcept
0059     {
0060         return QDate(stdSysDaysToJulianDay(days));
0061     }
0062 
0063     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0064     constexpr std::chrono::sys_days toStdSysDays() const noexcept
0065     {
0066         const qint64 days = isValid() ? jd - unixEpochJd() : 0;
0067         return std::chrono::sys_days(std::chrono::days(days));
0068     }
0069 #endif
0070 
0071     constexpr bool isNull() const { return !isValid(); }
0072     constexpr bool isValid() const { return jd >= minJd() && jd <= maxJd(); }
0073 
0074     // Gregorian-optimized:
0075     int year() const;
0076     int month() const;
0077     int day() const;
0078     int dayOfWeek() const;
0079     int dayOfYear() const;
0080     int daysInMonth() const;
0081     int daysInYear() const;
0082     int weekNumber(int *yearNum = nullptr) const; // ISO 8601, always Gregorian
0083 
0084     int year(QCalendar cal) const;
0085     int month(QCalendar cal) const;
0086     int day(QCalendar cal) const;
0087     int dayOfWeek(QCalendar cal) const;
0088     int dayOfYear(QCalendar cal) const;
0089     int daysInMonth(QCalendar cal) const;
0090     int daysInYear(QCalendar cal) const;
0091 
0092 #if QT_DEPRECATED_SINCE(6, 9)
0093     QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
0094     QDateTime startOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
0095     QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
0096     QDateTime endOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
0097 #endif
0098 
0099     QDateTime startOfDay(const QTimeZone &zone) const;
0100     QDateTime endOfDay(const QTimeZone &zone) const;
0101     QDateTime startOfDay() const;
0102     QDateTime endOfDay() const;
0103 
0104 #if QT_CONFIG(datestring)
0105     QString toString(Qt::DateFormat format = Qt::TextDate) const;
0106     QString toString(const QString &format) const;
0107     QString toString(const QString &format, QCalendar cal) const
0108     { return toString(qToStringViewIgnoringNull(format), cal); }
0109     QString toString(QStringView format) const;
0110     QString toString(QStringView format, QCalendar cal) const;
0111 #endif
0112     bool setDate(int year, int month, int day); // Gregorian-optimized
0113     bool setDate(int year, int month, int day, QCalendar cal);
0114 
0115     void getDate(int *year, int *month, int *day) const;
0116 
0117     [[nodiscard]] QDate addDays(qint64 days) const;
0118 // INTEGRITY incident-85878 (timezone and clock_cast are not supported)
0119 #if (__cpp_lib_chrono >= 201907L && !defined(Q_OS_INTEGRITY)) || defined(Q_QDOC)
0120     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0121     [[nodiscard]] QDate addDuration(std::chrono::days days) const
0122     {
0123         return addDays(days.count());
0124     }
0125 #endif
0126     // Gregorian-optimized:
0127     [[nodiscard]] QDate addMonths(int months) const;
0128     [[nodiscard]] QDate addYears(int years) const;
0129     [[nodiscard]] QDate addMonths(int months, QCalendar cal) const;
0130     [[nodiscard]] QDate addYears(int years, QCalendar cal) const;
0131     qint64 daysTo(QDate d) const;
0132 
0133     static QDate currentDate();
0134 #if QT_CONFIG(datestring)
0135     // No DateFormat accepts a two-digit year, so no need for baseYear:
0136     static QDate fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
0137     static QDate fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
0138     { return fromString(qToStringViewIgnoringNull(string), format); }
0139 
0140     // Accept calendar without over-ride of base year:
0141     static QDate fromString(QStringView string, QStringView format, QCalendar cal)
0142     { return fromString(string.toString(), format, QLocale::DefaultTwoDigitBaseYear, cal); }
0143     QT_CORE_INLINE_SINCE(6, 7)
0144     static QDate fromString(const QString &string, QStringView format, QCalendar cal);
0145     static QDate fromString(const QString &string, const QString &format, QCalendar cal)
0146     { return fromString(string, qToStringViewIgnoringNull(format), QLocale::DefaultTwoDigitBaseYear, cal); }
0147 
0148     // Overriding base year is likely more common than overriding calendar (and
0149     // likely to get more so, as the legacy base drops ever further behind us).
0150     static QDate fromString(QStringView string, QStringView format,
0151                             int baseYear = QLocale::DefaultTwoDigitBaseYear)
0152     { return fromString(string.toString(), format, baseYear); }
0153     static QDate fromString(QStringView string, QStringView format,
0154                             int baseYear, QCalendar cal)
0155     { return fromString(string.toString(), format, baseYear, cal); }
0156     static QDate fromString(const QString &string, QStringView format,
0157                             int baseYear = QLocale::DefaultTwoDigitBaseYear);
0158     static QDate fromString(const QString &string, QStringView format,
0159                             int baseYear, QCalendar cal);
0160     static QDate fromString(const QString &string, const QString &format,
0161                             int baseYear = QLocale::DefaultTwoDigitBaseYear)
0162     { return fromString(string, qToStringViewIgnoringNull(format), baseYear); }
0163     static QDate fromString(const QString &string, const QString &format,
0164                             int baseYear, QCalendar cal)
0165     { return fromString(string, qToStringViewIgnoringNull(format), baseYear, cal); }
0166 #endif
0167     static bool isValid(int y, int m, int d);
0168     static bool isLeapYear(int year);
0169 
0170     static constexpr inline QDate fromJulianDay(qint64 jd_)
0171     { return jd_ >= minJd() && jd_ <= maxJd() ? QDate(jd_) : QDate() ; }
0172     constexpr inline qint64 toJulianDay() const { return jd; }
0173 
0174 private:
0175     // using extra parentheses around min to avoid expanding it if it is a macro
0176     static constexpr inline qint64 nullJd() { return (std::numeric_limits<qint64>::min)(); }
0177     static constexpr inline qint64 minJd() { return Q_INT64_C(-784350574879); }
0178     static constexpr inline qint64 maxJd() { return Q_INT64_C( 784354017364); }
0179     static constexpr inline qint64 unixEpochJd() { return Q_INT64_C(2440588); }
0180 
0181 // INTEGRITY incident-85878 (timezone and clock_cast are not supported)
0182 #if __cpp_lib_chrono >= 201907L && !defined(Q_OS_INTEGRITY)
0183 #if !QT_CORE_REMOVED_SINCE(6, 7)
0184     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0185 #endif
0186     static constexpr qint64
0187     stdSysDaysToJulianDay(const std::chrono::sys_days &days) noexcept
0188     {
0189         const auto epochDays = days.time_since_epoch().count();
0190         // minJd() and maxJd() fit into 40 bits.
0191         if constexpr (sizeof(epochDays) * CHAR_BIT >= 41) {
0192             constexpr auto top = maxJd() - unixEpochJd();
0193             constexpr auto bottom = minJd() - unixEpochJd();
0194             if (epochDays > top || epochDays < bottom)
0195                 return nullJd();
0196         }
0197         return unixEpochJd() + epochDays;
0198     }
0199 #endif // __cpp_lib_chrono >= 201907L
0200 
0201     qint64 jd;
0202 
0203     friend class QDateTime;
0204     friend class QDateTimeParser;
0205     friend class QDateTimePrivate;
0206 
0207     friend constexpr bool comparesEqual(const QDate &lhs, const QDate &rhs) noexcept
0208     { return lhs.jd == rhs.jd; }
0209     friend constexpr Qt::strong_ordering
0210     compareThreeWay(const QDate &lhs, const QDate &rhs) noexcept
0211     { return Qt::compareThreeWay(lhs.jd, rhs.jd); }
0212     Q_DECLARE_STRONGLY_ORDERED_LITERAL_TYPE(QDate)
0213 
0214 #ifndef QT_NO_DATASTREAM
0215     friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
0216     friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
0217 #endif
0218 };
0219 Q_DECLARE_TYPEINFO(QDate, Q_RELOCATABLE_TYPE);
0220 
0221 class Q_CORE_EXPORT QTime
0222 {
0223     explicit constexpr QTime(int ms) : mds(ms)
0224     {}
0225 public:
0226     constexpr QTime(): mds(NullTime)
0227     {}
0228     QTime(int h, int m, int s = 0, int ms = 0);
0229 
0230     constexpr bool isNull() const { return mds == NullTime; }
0231     bool isValid() const;
0232 
0233     int hour() const;
0234     int minute() const;
0235     int second() const;
0236     int msec() const;
0237 #if QT_CONFIG(datestring)
0238     QString toString(Qt::DateFormat f = Qt::TextDate) const;
0239     QString toString(const QString &format) const
0240     { return toString(qToStringViewIgnoringNull(format)); }
0241     QString toString(QStringView format) const;
0242 #endif
0243     bool setHMS(int h, int m, int s, int ms = 0);
0244 
0245     [[nodiscard]] QTime addSecs(int secs) const;
0246     int secsTo(QTime t) const;
0247     [[nodiscard]] QTime addMSecs(int ms) const;
0248     int msecsTo(QTime t) const;
0249 
0250     static constexpr inline QTime fromMSecsSinceStartOfDay(int msecs) { return QTime(msecs); }
0251     constexpr inline int msecsSinceStartOfDay() const { return mds == NullTime ? 0 : mds; }
0252 
0253     static QTime currentTime();
0254 #if QT_CONFIG(datestring)
0255     static QTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
0256     static QTime fromString(QStringView string, QStringView format)
0257     { return fromString(string.toString(), format); }
0258     static QTime fromString(const QString &string, QStringView format);
0259     static QTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
0260     { return fromString(qToStringViewIgnoringNull(string), format); }
0261     static QTime fromString(const QString &string, const QString &format)
0262     { return fromString(string, qToStringViewIgnoringNull(format)); }
0263 #endif
0264     static bool isValid(int h, int m, int s, int ms = 0);
0265 
0266 private:
0267     enum TimeFlag { NullTime = -1 };
0268     constexpr inline int ds() const { return mds == -1 ? 0 : mds; }
0269     int mds;
0270 
0271     friend constexpr bool comparesEqual(const QTime &lhs, const QTime &rhs) noexcept
0272     { return lhs.mds == rhs.mds; }
0273     friend constexpr Qt::strong_ordering
0274     compareThreeWay(const QTime &lhs, const QTime &rhs) noexcept
0275     { return Qt::compareThreeWay(lhs.mds, rhs.mds); }
0276     Q_DECLARE_STRONGLY_ORDERED_LITERAL_TYPE(QTime)
0277 
0278     friend class QDateTime;
0279     friend class QDateTimePrivate;
0280 #ifndef QT_NO_DATASTREAM
0281     friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
0282     friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
0283 #endif
0284 };
0285 Q_DECLARE_TYPEINFO(QTime, Q_RELOCATABLE_TYPE);
0286 
0287 class QDateTimePrivate;
0288 
0289 class Q_CORE_EXPORT QDateTime
0290 {
0291     struct ShortData {
0292 #if QT_VERSION >= QT_VERSION_CHECK(7,0,0) || defined(QT_BOOTSTRAPPED)
0293 #  if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
0294         qint64 status : 8;
0295 #  endif
0296         qint64 msecs : 56;
0297 
0298 #  if Q_BYTE_ORDER == Q_BIG_ENDIAN
0299         qint64 status : 8;
0300 #  endif
0301 #else
0302 #  if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
0303         quintptr status : 8;
0304 #  endif
0305         // note: this is only 24 bits on 32-bit systems...
0306         qintptr msecs : sizeof(void *) * 8 - 8;
0307 
0308 #  if Q_BYTE_ORDER == Q_BIG_ENDIAN
0309         quintptr status : 8;
0310 #  endif
0311 #endif
0312         friend constexpr bool operator==(ShortData lhs, ShortData rhs)
0313         { return lhs.status == rhs.status && lhs.msecs == rhs.msecs; }
0314     };
0315 
0316     union Data {
0317         // To be of any use, we need at least 60 years around 1970, which
0318         // is 1,893,456,000,000 ms. That requires 41 bits to store, plus
0319         // the sign bit. With the status byte, the minimum size is 50 bits.
0320         static constexpr bool CanBeSmall = sizeof(ShortData) * 8 > 50;
0321 
0322         Data() noexcept;
0323         Data(const QTimeZone &);
0324         Data(const Data &other) noexcept;
0325         Data(Data &&other) noexcept;
0326         Data &operator=(const Data &other) noexcept;
0327         Data &operator=(Data &&other) noexcept { swap(other); return *this; }
0328         ~Data();
0329 
0330         void swap(Data &other) noexcept
0331         { std::swap(data, other.data); }
0332 
0333         bool isShort() const;
0334         inline void invalidate();
0335         void detach();
0336         QTimeZone timeZone() const;
0337 
0338         const QDateTimePrivate *operator->() const;
0339         QDateTimePrivate *operator->();
0340 
0341         QDateTimePrivate *d;
0342         ShortData data;
0343     };
0344 
0345 public:
0346     QDateTime() noexcept;
0347 
0348     enum class TransitionResolution {
0349         Reject = 0,
0350         RelativeToBefore,
0351         RelativeToAfter,
0352         PreferBefore,
0353         PreferAfter,
0354         PreferStandard,
0355         PreferDaylightSaving,
0356         // Closest match to behavior prior to introducing TransitionResolution:
0357         LegacyBehavior = RelativeToBefore
0358     };
0359 
0360 #if QT_DEPRECATED_SINCE(6, 9)
0361     QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
0362     QDateTime(QDate date, QTime time, Qt::TimeSpec spec, int offsetSeconds = 0);
0363 #endif
0364 #if QT_CORE_REMOVED_SINCE(6, 7)
0365     QDateTime(QDate date, QTime time, const QTimeZone &timeZone);
0366     QDateTime(QDate date, QTime time);
0367 #endif
0368     QDateTime(QDate date, QTime time, const QTimeZone &timeZone,
0369               TransitionResolution resolve = TransitionResolution::LegacyBehavior);
0370     QDateTime(QDate date, QTime time,
0371               TransitionResolution resolve = TransitionResolution::LegacyBehavior);
0372     QDateTime(const QDateTime &other) noexcept;
0373     QDateTime(QDateTime &&other) noexcept;
0374     ~QDateTime();
0375 
0376     QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QDateTime)
0377     QDateTime &operator=(const QDateTime &other) noexcept;
0378 
0379     void swap(QDateTime &other) noexcept { d.swap(other.d); }
0380 
0381     bool isNull() const;
0382     bool isValid() const;
0383 
0384     QDate date() const;
0385     QTime time() const;
0386     Qt::TimeSpec timeSpec() const;
0387     int offsetFromUtc() const;
0388     QTimeZone timeRepresentation() const;
0389 #if QT_CONFIG(timezone)
0390     QTimeZone timeZone() const;
0391 #endif // timezone
0392     QString timeZoneAbbreviation() const;
0393     bool isDaylightTime() const;
0394 
0395     qint64 toMSecsSinceEpoch() const;
0396     qint64 toSecsSinceEpoch() const;
0397 
0398 #if QT_CORE_REMOVED_SINCE(6, 7)
0399     void setDate(QDate date);
0400     void setTime(QTime time);
0401 #endif
0402     void setDate(QDate date, TransitionResolution resolve = TransitionResolution::LegacyBehavior);
0403     void setTime(QTime time, TransitionResolution resolve = TransitionResolution::LegacyBehavior);
0404 
0405 #if QT_DEPRECATED_SINCE(6, 9)
0406     QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
0407     void setTimeSpec(Qt::TimeSpec spec);
0408     QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
0409     void setOffsetFromUtc(int offsetSeconds);
0410 #endif
0411 #if QT_CORE_REMOVED_SINCE(6, 7)
0412     void setTimeZone(const QTimeZone &toZone);
0413 #endif
0414     void setTimeZone(const QTimeZone &toZone,
0415                      TransitionResolution resolve = TransitionResolution::LegacyBehavior);
0416     void setMSecsSinceEpoch(qint64 msecs);
0417     void setSecsSinceEpoch(qint64 secs);
0418 
0419 #if QT_CONFIG(datestring)
0420     QString toString(Qt::DateFormat format = Qt::TextDate) const;
0421     QString toString(const QString &format) const;
0422     QString toString(const QString &format, QCalendar cal) const
0423     { return toString(qToStringViewIgnoringNull(format), cal); }
0424     QString toString(QStringView format) const;
0425     QString toString(QStringView format, QCalendar cal) const;
0426 #endif
0427     [[nodiscard]] QDateTime addDays(qint64 days) const;
0428     [[nodiscard]] QDateTime addMonths(int months) const;
0429     [[nodiscard]] QDateTime addYears(int years) const;
0430     [[nodiscard]] QDateTime addSecs(qint64 secs) const;
0431     [[nodiscard]] QDateTime addMSecs(qint64 msecs) const;
0432     [[nodiscard]] QDateTime addDuration(std::chrono::milliseconds msecs) const
0433     {
0434         return addMSecs(msecs.count());
0435     }
0436 
0437 #if QT_DEPRECATED_SINCE(6, 9)
0438     QT_DEPRECATED_VERSION_X_6_9("Use toTimeZone instead")
0439     QDateTime toTimeSpec(Qt::TimeSpec spec) const;
0440 #endif
0441     QDateTime toLocalTime() const;
0442     QDateTime toUTC() const;
0443     QDateTime toOffsetFromUtc(int offsetSeconds) const;
0444     QDateTime toTimeZone(const QTimeZone &toZone) const;
0445 
0446     qint64 daysTo(const QDateTime &) const;
0447     qint64 secsTo(const QDateTime &) const;
0448     qint64 msecsTo(const QDateTime &) const;
0449 
0450     static QDateTime currentDateTime(const QTimeZone &zone);
0451     static QDateTime currentDateTime();
0452     static QDateTime currentDateTimeUtc();
0453 #if QT_CONFIG(datestring)
0454     // No DateFormat accepts a two-digit year, so no need for baseYear:
0455     static QDateTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
0456     static QDateTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
0457     { return fromString(qToStringViewIgnoringNull(string), format); }
0458 
0459     // Accept calendar without over-ride of base year:
0460     static QDateTime fromString(QStringView string, QStringView format, QCalendar cal)
0461     { return fromString(string.toString(), format, QLocale::DefaultTwoDigitBaseYear, cal); }
0462     QT_CORE_INLINE_SINCE(6, 7)
0463     static QDateTime fromString(const QString &string, QStringView format, QCalendar cal);
0464     static QDateTime fromString(const QString &string, const QString &format, QCalendar cal)
0465     { return fromString(string, qToStringViewIgnoringNull(format), QLocale::DefaultTwoDigitBaseYear, cal); }
0466 
0467     // Overriding base year is likely more common than overriding calendar (and
0468     // likely to get more so, as the legacy base drops ever further behind us).
0469     static QDateTime fromString(QStringView string, QStringView format,
0470                                 int baseYear = QLocale::DefaultTwoDigitBaseYear)
0471     { return fromString(string.toString(), format, baseYear); }
0472     static QDateTime fromString(QStringView string, QStringView format,
0473                                 int baseYear, QCalendar cal)
0474     { return fromString(string.toString(), format, baseYear, cal); }
0475     static QDateTime fromString(const QString &string, QStringView format,
0476                                 int baseYear = QLocale::DefaultTwoDigitBaseYear);
0477     static QDateTime fromString(const QString &string, QStringView format,
0478                                 int baseYear, QCalendar cal);
0479     static QDateTime fromString(const QString &string, const QString &format,
0480                                 int baseYear = QLocale::DefaultTwoDigitBaseYear)
0481     { return fromString(string, qToStringViewIgnoringNull(format), baseYear); }
0482     static QDateTime fromString(const QString &string, const QString &format,
0483                                 int baseYear, QCalendar cal)
0484     { return fromString(string, qToStringViewIgnoringNull(format), baseYear, cal); }
0485 #endif
0486 
0487 #if QT_DEPRECATED_SINCE(6, 9)
0488     QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
0489     static QDateTime fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int offsetFromUtc = 0);
0490     QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
0491     static QDateTime fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offsetFromUtc = 0);
0492 #endif
0493 
0494     static QDateTime fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone);
0495     static QDateTime fromSecsSinceEpoch(qint64 secs, const QTimeZone &timeZone);
0496     static QDateTime fromMSecsSinceEpoch(qint64 msecs);
0497     static QDateTime fromSecsSinceEpoch(qint64 secs);
0498 
0499     static qint64 currentMSecsSinceEpoch() noexcept;
0500     static qint64 currentSecsSinceEpoch() noexcept;
0501 
0502 #if defined(Q_OS_DARWIN) || defined(Q_QDOC)
0503     static QDateTime fromCFDate(CFDateRef date);
0504     CFDateRef toCFDate() const Q_DECL_CF_RETURNS_RETAINED;
0505     static QDateTime fromNSDate(const NSDate *date);
0506     NSDate *toNSDate() const Q_DECL_NS_RETURNS_AUTORELEASED;
0507 #endif
0508 
0509     static QDateTime fromStdTimePoint(
0510         std::chrono::time_point<
0511             std::chrono::system_clock,
0512             std::chrono::milliseconds
0513         > time
0514     );
0515 
0516 // INTEGRITY incident-85878 (timezone and clock_cast are not supported)
0517 #if (__cpp_lib_chrono >= 201907L && !defined(Q_OS_INTEGRITY)) || defined(Q_QDOC)
0518 #if __cpp_concepts >= 201907L || defined(Q_QDOC)
0519 private:
0520     // The duration type of the result of a clock_cast<system_clock>.
0521     // This duration may differ from the duration of the input.
0522     template <typename Clock, typename Duration>
0523     using system_clock_cast_duration = decltype(
0524         std::chrono::clock_cast<std::chrono::system_clock>(
0525             std::declval<const std::chrono::time_point<Clock, Duration> &>()
0526         ).time_since_epoch()
0527     );
0528 
0529 public:
0530     // Generic clock, as long as it's compatible with us (= system_clock)
0531     template <typename Clock, typename Duration>
0532     static QDateTime fromStdTimePoint(const std::chrono::time_point<Clock, Duration> &time)
0533         requires
0534             requires(const std::chrono::time_point<Clock, Duration> &t) {
0535                 // the clock can be converted to system_clock
0536                 std::chrono::clock_cast<std::chrono::system_clock>(t);
0537                 // after the conversion to system_clock, the duration type
0538                 // we get is convertible to milliseconds
0539                 requires std::is_convertible_v<
0540                     system_clock_cast_duration<Clock, Duration>,
0541                     std::chrono::milliseconds
0542                 >;
0543             }
0544     {
0545         using namespace std::chrono;
0546         const sys_time<milliseconds> sysTime = clock_cast<system_clock>(time);
0547         return fromStdTimePoint(sysTime);
0548     }
0549 #endif // __cpp_concepts
0550 
0551     // local_time
0552     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0553     static QDateTime fromStdTimePoint(const std::chrono::local_time<std::chrono::milliseconds> &time)
0554     {
0555         return fromStdLocalTime(time);
0556     }
0557 
0558     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0559     static QDateTime fromStdLocalTime(const std::chrono::local_time<std::chrono::milliseconds> &time)
0560     {
0561         QDateTime result(QDate(1970, 1, 1), QTime(0, 0, 0), TransitionResolution::LegacyBehavior);
0562         return result.addMSecs(time.time_since_epoch().count());
0563     }
0564 
0565 #if QT_CONFIG(timezone) && (__cpp_lib_chrono >= 201907L || defined(Q_QDOC))
0566     // zoned_time. defined in qtimezone.h
0567     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0568     static QDateTime fromStdZonedTime(const std::chrono::zoned_time<
0569                                           std::chrono::milliseconds,
0570                                           const std::chrono::time_zone *
0571                                       > &time);
0572 #endif // QT_CONFIG(timezone)
0573 
0574     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0575     std::chrono::sys_time<std::chrono::milliseconds> toStdSysMilliseconds() const
0576     {
0577         const std::chrono::milliseconds duration(toMSecsSinceEpoch());
0578         return std::chrono::sys_time<std::chrono::milliseconds>(duration);
0579     }
0580 
0581     QT_POST_CXX17_API_IN_EXPORTED_CLASS
0582     std::chrono::sys_seconds toStdSysSeconds() const
0583     {
0584         const std::chrono::seconds duration(toSecsSinceEpoch());
0585         return std::chrono::sys_seconds(duration);
0586     }
0587 #endif // __cpp_lib_chrono >= 201907L && !Q_OS_INTEGRITY
0588 
0589     friend std::chrono::milliseconds operator-(const QDateTime &lhs, const QDateTime &rhs)
0590     {
0591         return std::chrono::milliseconds(rhs.msecsTo(lhs));
0592     }
0593 
0594     friend QDateTime operator+(const QDateTime &dateTime, std::chrono::milliseconds duration)
0595     {
0596         return dateTime.addMSecs(duration.count());
0597     }
0598 
0599     friend QDateTime operator+(std::chrono::milliseconds duration, const QDateTime &dateTime)
0600     {
0601         return dateTime + duration;
0602     }
0603 
0604     QDateTime &operator+=(std::chrono::milliseconds duration)
0605     {
0606         *this = addMSecs(duration.count());
0607         return *this;
0608     }
0609 
0610     friend QDateTime operator-(const QDateTime &dateTime, std::chrono::milliseconds duration)
0611     {
0612         return dateTime.addMSecs(-duration.count());
0613     }
0614 
0615     QDateTime &operator-=(std::chrono::milliseconds duration)
0616     {
0617         *this = addMSecs(-duration.count());
0618         return *this;
0619     }
0620 
0621     // (1<<63) ms is 292277024.6 (average Gregorian) years, counted from the start of 1970, so
0622     // Last is floor(1970 + 292277024.6); no year 0, so First is floor(1970 - 1 - 292277024.6)
0623     enum class YearRange : qint32 { First = -292275056,  Last = +292278994 };
0624 
0625 private:
0626     bool equals(const QDateTime &other) const;
0627 #if QT_CORE_REMOVED_SINCE(6, 7)
0628     bool precedes(const QDateTime &other) const;
0629 #endif
0630     friend class QDateTimePrivate;
0631 
0632     Data d;
0633 
0634     friend bool comparesEqual(const QDateTime &lhs, const QDateTime &rhs)
0635     { return lhs.equals(rhs); }
0636     friend Q_CORE_EXPORT Qt::weak_ordering
0637     compareThreeWay(const QDateTime &lhs, const QDateTime &rhs);
0638     Q_DECLARE_WEAKLY_ORDERED_NON_NOEXCEPT(QDateTime)
0639 
0640 #ifndef QT_NO_DATASTREAM
0641     friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
0642     friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
0643 #endif
0644 
0645 #if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
0646     friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
0647 #endif
0648 };
0649 Q_DECLARE_SHARED(QDateTime)
0650 
0651 #ifndef QT_NO_DATASTREAM
0652 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
0653 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
0654 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
0655 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
0656 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
0657 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
0658 #endif // QT_NO_DATASTREAM
0659 
0660 #if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
0661 Q_CORE_EXPORT QDebug operator<<(QDebug, QDate);
0662 Q_CORE_EXPORT QDebug operator<<(QDebug, QTime);
0663 Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
0664 #endif
0665 
0666 // QDateTime is not noexcept for now -- to be revised once
0667 // timezone and calendaring support is added
0668 Q_CORE_EXPORT size_t qHash(const QDateTime &key, size_t seed = 0);
0669 Q_CORE_EXPORT size_t qHash(QDate key, size_t seed = 0) noexcept;
0670 Q_CORE_EXPORT size_t qHash(QTime key, size_t seed = 0) noexcept;
0671 
0672 #if QT_CONFIG(datestring) && QT_CORE_INLINE_IMPL_SINCE(6, 7)
0673 QDate QDate::fromString(const QString &string, QStringView format, QCalendar cal)
0674 {
0675     return fromString(string, format, QLocale::DefaultTwoDigitBaseYear, cal);
0676 }
0677 
0678 QDateTime QDateTime::fromString(const QString &string, QStringView format, QCalendar cal)
0679 {
0680     return fromString(string, format, QLocale::DefaultTwoDigitBaseYear, cal);
0681 }
0682 #endif
0683 
0684 QT_END_NAMESPACE
0685 
0686 #endif // QDATETIME_H
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