1// Copyright (C) 2021 The Qt Company Ltd.
2// Copyright (C) 2021 Intel Corporation.
3// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
4
5#ifndef QDATETIME_H
6#define QDATETIME_H
7
8#include <QtCore/qcalendar.h>
9#include <QtCore/qnamespace.h>
10#include <QtCore/qshareddata.h>
11#include <QtCore/qstring.h>
12
13#include <limits>
14#include <chrono>
15
16#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
17Q_FORWARD_DECLARE_CF_TYPE(CFDate);
18Q_FORWARD_DECLARE_OBJC_CLASS(NSDate);
19#endif
20
21QT_BEGIN_NAMESPACE
22
23class QTimeZone;
24class QDateTime;
25
26class Q_CORE_EXPORT QDate
27{
28 explicit constexpr QDate(qint64 julianDay) : jd(julianDay) {}
29public:
30 constexpr QDate() : jd(nullJd()) {}
31 QDate(int y, int m, int d);
32 QDate(int y, int m, int d, QCalendar cal);
33#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
34 QT_POST_CXX17_API_IN_EXPORTED_CLASS
35 Q_IMPLICIT QDate(std::chrono::year_month_day ymd)
36 {
37 if (!ymd.ok())
38 jd = nullJd();
39 else
40 *this = fromStdSysDays(ymd);
41 }
42
43 QT_POST_CXX17_API_IN_EXPORTED_CLASS
44 Q_IMPLICIT QDate(std::chrono::year_month_day_last ymdl)
45 {
46 if (!ymdl.ok())
47 jd = nullJd();
48 else
49 *this = fromStdSysDays(ymdl);
50 }
51
52 QT_POST_CXX17_API_IN_EXPORTED_CLASS
53 Q_IMPLICIT QDate(std::chrono::year_month_weekday ymw)
54 {
55 if (!ymw.ok())
56 jd = nullJd();
57 else
58 *this = fromStdSysDays(ymw);
59 }
60
61 QT_POST_CXX17_API_IN_EXPORTED_CLASS
62 Q_IMPLICIT QDate(std::chrono::year_month_weekday_last ymwl)
63 {
64 if (!ymwl.ok())
65 jd = nullJd();
66 else
67 *this = fromStdSysDays(ymwl);
68 }
69
70 QT_POST_CXX17_API_IN_EXPORTED_CLASS
71 static QDate fromStdSysDays(const std::chrono::sys_days &days)
72 {
73 const QDate epoch(unixEpochJd());
74 return epoch.addDays(days.time_since_epoch().count());
75 }
76
77 QT_POST_CXX17_API_IN_EXPORTED_CLASS
78 std::chrono::sys_days toStdSysDays() const
79 {
80 const QDate epoch(unixEpochJd());
81 return std::chrono::sys_days(std::chrono::days(epoch.daysTo(*this)));
82 }
83#endif
84
85 constexpr bool isNull() const { return !isValid(); }
86 constexpr bool isValid() const { return jd >= minJd() && jd <= maxJd(); }
87
88 // Gregorian-optimized:
89 int year() const;
90 int month() const;
91 int day() const;
92 int dayOfWeek() const;
93 int dayOfYear() const;
94 int daysInMonth() const;
95 int daysInYear() const;
96 int weekNumber(int *yearNum = nullptr) const; // ISO 8601, always Gregorian
97
98 int year(QCalendar cal) const;
99 int month(QCalendar cal) const;
100 int day(QCalendar cal) const;
101 int dayOfWeek(QCalendar cal) const;
102 int dayOfYear(QCalendar cal) const;
103 int daysInMonth(QCalendar cal) const;
104 int daysInYear(QCalendar cal) const;
105
106#if QT_DEPRECATED_SINCE(6, 9)
107 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
108 QDateTime startOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
109 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
110 QDateTime endOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
111#endif
112
113 QDateTime startOfDay(const QTimeZone &zone) const;
114 QDateTime endOfDay(const QTimeZone &zone) const;
115 QDateTime startOfDay() const;
116 QDateTime endOfDay() const;
117
118#if QT_CONFIG(datestring)
119 QString toString(Qt::DateFormat format = Qt::TextDate) const;
120 QString toString(const QString &format, QCalendar cal = QCalendar()) const
121 { return toString(format: qToStringViewIgnoringNull(s: format), cal); }
122 QString toString(QStringView format, QCalendar cal = QCalendar()) const;
123#endif
124 bool setDate(int year, int month, int day); // Gregorian-optimized
125 bool setDate(int year, int month, int day, QCalendar cal);
126
127 void getDate(int *year, int *month, int *day) const;
128
129 [[nodiscard]] QDate addDays(qint64 days) const;
130#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
131 QT_POST_CXX17_API_IN_EXPORTED_CLASS
132 [[nodiscard]] QDate addDuration(std::chrono::days days) const
133 {
134 return addDays(days.count());
135 }
136#endif
137 // Gregorian-optimized:
138 [[nodiscard]] QDate addMonths(int months) const;
139 [[nodiscard]] QDate addYears(int years) const;
140 [[nodiscard]] QDate addMonths(int months, QCalendar cal) const;
141 [[nodiscard]] QDate addYears(int years, QCalendar cal) const;
142 qint64 daysTo(QDate d) const;
143
144 static QDate currentDate();
145#if QT_CONFIG(datestring)
146 static QDate fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
147 static QDate fromString(QStringView string, QStringView format, QCalendar cal = QCalendar())
148 { return fromString(string: string.toString(), format, cal); }
149 static QDate fromString(const QString &string, QStringView format, QCalendar cal = QCalendar());
150 static QDate fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
151 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
152 static QDate fromString(const QString &string, const QString &format,
153 QCalendar cal = QCalendar())
154 { return fromString(string, format: qToStringViewIgnoringNull(s: format), cal); }
155#endif
156 static bool isValid(int y, int m, int d);
157 static bool isLeapYear(int year);
158
159 static constexpr inline QDate fromJulianDay(qint64 jd_)
160 { return jd_ >= minJd() && jd_ <= maxJd() ? QDate(jd_) : QDate() ; }
161 constexpr inline qint64 toJulianDay() const { return jd; }
162
163private:
164 // using extra parentheses around min to avoid expanding it if it is a macro
165 static constexpr inline qint64 nullJd() { return (std::numeric_limits<qint64>::min)(); }
166 static constexpr inline qint64 minJd() { return Q_INT64_C(-784350574879); }
167 static constexpr inline qint64 maxJd() { return Q_INT64_C( 784354017364); }
168 static constexpr inline qint64 unixEpochJd() { return Q_INT64_C(2440588); }
169
170 qint64 jd;
171
172 friend class QDateTime;
173 friend class QDateTimePrivate;
174
175 friend constexpr bool operator==(QDate lhs, QDate rhs) { return lhs.jd == rhs.jd; }
176 friend constexpr bool operator!=(QDate lhs, QDate rhs) { return lhs.jd != rhs.jd; }
177 friend constexpr bool operator< (QDate lhs, QDate rhs) { return lhs.jd < rhs.jd; }
178 friend constexpr bool operator<=(QDate lhs, QDate rhs) { return lhs.jd <= rhs.jd; }
179 friend constexpr bool operator> (QDate lhs, QDate rhs) { return lhs.jd > rhs.jd; }
180 friend constexpr bool operator>=(QDate lhs, QDate rhs) { return lhs.jd >= rhs.jd; }
181#ifndef QT_NO_DATASTREAM
182 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
183 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
184#endif
185};
186Q_DECLARE_TYPEINFO(QDate, Q_RELOCATABLE_TYPE);
187
188class Q_CORE_EXPORT QTime
189{
190 explicit constexpr QTime(int ms) : mds(ms)
191 {}
192public:
193 constexpr QTime(): mds(NullTime)
194 {}
195 QTime(int h, int m, int s = 0, int ms = 0);
196
197 constexpr bool isNull() const { return mds == NullTime; }
198 bool isValid() const;
199
200 int hour() const;
201 int minute() const;
202 int second() const;
203 int msec() const;
204#if QT_CONFIG(datestring)
205 QString toString(Qt::DateFormat f = Qt::TextDate) const;
206 QString toString(const QString &format) const
207 { return toString(format: qToStringViewIgnoringNull(s: format)); }
208 QString toString(QStringView format) const;
209#endif
210 bool setHMS(int h, int m, int s, int ms = 0);
211
212 [[nodiscard]] QTime addSecs(int secs) const;
213 int secsTo(QTime t) const;
214 [[nodiscard]] QTime addMSecs(int ms) const;
215 int msecsTo(QTime t) const;
216
217 static constexpr inline QTime fromMSecsSinceStartOfDay(int msecs) { return QTime(msecs); }
218 constexpr inline int msecsSinceStartOfDay() const { return mds == NullTime ? 0 : mds; }
219
220 static QTime currentTime();
221#if QT_CONFIG(datestring)
222 static QTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
223 static QTime fromString(QStringView string, QStringView format)
224 { return fromString(string: string.toString(), format); }
225 static QTime fromString(const QString &string, QStringView format);
226 static QTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
227 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
228 static QTime fromString(const QString &string, const QString &format)
229 { return fromString(string, format: qToStringViewIgnoringNull(s: format)); }
230#endif
231 static bool isValid(int h, int m, int s, int ms = 0);
232
233private:
234 enum TimeFlag { NullTime = -1 };
235 constexpr inline int ds() const { return mds == -1 ? 0 : mds; }
236 int mds;
237
238 friend constexpr bool operator==(QTime lhs, QTime rhs) { return lhs.mds == rhs.mds; }
239 friend constexpr bool operator!=(QTime lhs, QTime rhs) { return lhs.mds != rhs.mds; }
240 friend constexpr bool operator< (QTime lhs, QTime rhs) { return lhs.mds < rhs.mds; }
241 friend constexpr bool operator<=(QTime lhs, QTime rhs) { return lhs.mds <= rhs.mds; }
242 friend constexpr bool operator> (QTime lhs, QTime rhs) { return lhs.mds > rhs.mds; }
243 friend constexpr bool operator>=(QTime lhs, QTime rhs) { return lhs.mds >= rhs.mds; }
244
245 friend class QDateTime;
246 friend class QDateTimePrivate;
247#ifndef QT_NO_DATASTREAM
248 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
249 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
250#endif
251};
252Q_DECLARE_TYPEINFO(QTime, Q_RELOCATABLE_TYPE);
253
254class QDateTimePrivate;
255
256class Q_CORE_EXPORT QDateTime
257{
258 struct ShortData {
259#if QT_VERSION >= QT_VERSION_CHECK(7,0,0) || defined(QT_BOOTSTRAPPED)
260# if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
261 qint64 status : 8;
262# endif
263 qint64 msecs : 56;
264
265# if Q_BYTE_ORDER == Q_BIG_ENDIAN
266 qint64 status : 8;
267# endif
268#else
269# if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
270 quintptr status : 8;
271# endif
272 // note: this is only 24 bits on 32-bit systems...
273 qintptr msecs : sizeof(void *) * 8 - 8;
274
275# if Q_BYTE_ORDER == Q_BIG_ENDIAN
276 quintptr status : 8;
277# endif
278#endif
279 friend constexpr bool operator==(const ShortData &lhs, const ShortData &rhs)
280 { return lhs.status == rhs.status && lhs.msecs == rhs.msecs; }
281 };
282
283 union Data {
284 // To be of any use, we need at least 60 years around 1970, which
285 // is 1,893,456,000,000 ms. That requires 41 bits to store, plus
286 // the sign bit. With the status byte, the minimum size is 50 bits.
287 static constexpr bool CanBeSmall = sizeof(ShortData) * 8 > 50;
288
289 Data() noexcept;
290 Data(const QTimeZone &);
291 Data(const Data &other) noexcept;
292 Data(Data &&other) noexcept;
293 Data &operator=(const Data &other) noexcept;
294 Data &operator=(Data &&other) noexcept { swap(other); return *this; }
295 ~Data();
296
297 void swap(Data &other) noexcept
298 { std::swap(a&: data, b&: other.data); }
299
300 bool isShort() const;
301 void detach();
302 QTimeZone timeZone() const;
303
304 const QDateTimePrivate *operator->() const;
305 QDateTimePrivate *operator->();
306
307 QDateTimePrivate *d;
308 ShortData data;
309 };
310
311public:
312 QDateTime() noexcept;
313#if QT_DEPRECATED_SINCE(6, 9)
314 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
315 QDateTime(QDate date, QTime time, Qt::TimeSpec spec, int offsetSeconds = 0);
316#endif
317 QDateTime(QDate date, QTime time, const QTimeZone &timeZone);
318 QDateTime(QDate date, QTime time);
319 QDateTime(const QDateTime &other) noexcept;
320 QDateTime(QDateTime &&other) noexcept;
321 ~QDateTime();
322
323 QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QDateTime)
324 QDateTime &operator=(const QDateTime &other) noexcept;
325
326 void swap(QDateTime &other) noexcept { d.swap(other&: other.d); }
327
328 bool isNull() const;
329 bool isValid() const;
330
331 QDate date() const;
332 QTime time() const;
333 Qt::TimeSpec timeSpec() const;
334 int offsetFromUtc() const;
335 QTimeZone timeRepresentation() const;
336#if QT_CONFIG(timezone)
337 QTimeZone timeZone() const;
338#endif // timezone
339 QString timeZoneAbbreviation() const;
340 bool isDaylightTime() const;
341
342 qint64 toMSecsSinceEpoch() const;
343 qint64 toSecsSinceEpoch() const;
344
345 void setDate(QDate date);
346 void setTime(QTime time);
347#if QT_DEPRECATED_SINCE(6, 9)
348 QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
349 void setTimeSpec(Qt::TimeSpec spec);
350 QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
351 void setOffsetFromUtc(int offsetSeconds);
352#endif
353 void setTimeZone(const QTimeZone &toZone);
354 void setMSecsSinceEpoch(qint64 msecs);
355 void setSecsSinceEpoch(qint64 secs);
356
357#if QT_CONFIG(datestring)
358 QString toString(Qt::DateFormat format = Qt::TextDate) const;
359 QString toString(const QString &format, QCalendar cal = QCalendar()) const
360 { return toString(format: qToStringViewIgnoringNull(s: format), cal); }
361 QString toString(QStringView format, QCalendar cal = QCalendar()) const;
362#endif
363 [[nodiscard]] QDateTime addDays(qint64 days) const;
364 [[nodiscard]] QDateTime addMonths(int months) const;
365 [[nodiscard]] QDateTime addYears(int years) const;
366 [[nodiscard]] QDateTime addSecs(qint64 secs) const;
367 [[nodiscard]] QDateTime addMSecs(qint64 msecs) const;
368 [[nodiscard]] QDateTime addDuration(std::chrono::milliseconds msecs) const
369 {
370 return addMSecs(msecs: msecs.count());
371 }
372
373#if QT_DEPRECATED_SINCE(6, 9)
374 QT_DEPRECATED_VERSION_X_6_9("Use toTimeZone instead")
375 QDateTime toTimeSpec(Qt::TimeSpec spec) const;
376#endif
377 QDateTime toLocalTime() const;
378 QDateTime toUTC() const;
379 QDateTime toOffsetFromUtc(int offsetSeconds) const;
380 QDateTime toTimeZone(const QTimeZone &toZone) const;
381
382 qint64 daysTo(const QDateTime &) const;
383 qint64 secsTo(const QDateTime &) const;
384 qint64 msecsTo(const QDateTime &) const;
385
386 static QDateTime currentDateTime(const QTimeZone &zone);
387 static QDateTime currentDateTime();
388 static QDateTime currentDateTimeUtc();
389#if QT_CONFIG(datestring)
390 static QDateTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
391 static QDateTime fromString(QStringView string, QStringView format,
392 QCalendar cal = QCalendar())
393 { return fromString(string: string.toString(), format, cal); }
394 static QDateTime fromString(const QString &string, QStringView format,
395 QCalendar cal = QCalendar());
396 static QDateTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
397 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
398 static QDateTime fromString(const QString &string, const QString &format,
399 QCalendar cal = QCalendar())
400 { return fromString(string, format: qToStringViewIgnoringNull(s: format), cal); }
401#endif
402
403#if QT_DEPRECATED_SINCE(6, 9)
404 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
405 static QDateTime fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int offsetFromUtc = 0);
406 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
407 static QDateTime fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offsetFromUtc = 0);
408#endif
409
410 static QDateTime fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone);
411 static QDateTime fromSecsSinceEpoch(qint64 secs, const QTimeZone &timeZone);
412 static QDateTime fromMSecsSinceEpoch(qint64 msecs);
413 static QDateTime fromSecsSinceEpoch(qint64 secs);
414
415 static qint64 currentMSecsSinceEpoch() noexcept;
416 static qint64 currentSecsSinceEpoch() noexcept;
417
418#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
419 static QDateTime fromCFDate(CFDateRef date);
420 CFDateRef toCFDate() const Q_DECL_CF_RETURNS_RETAINED;
421 static QDateTime fromNSDate(const NSDate *date);
422 NSDate *toNSDate() const Q_DECL_NS_RETURNS_AUTORELEASED;
423#endif
424
425#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
426#if __cpp_concepts >= 201907L || defined(Q_QDOC)
427 // Generic clock, as long as it's compatible with us (= system_clock)
428 template <typename Clock, typename Duration>
429 static QDateTime fromStdTimePoint(const std::chrono::time_point<Clock, Duration> &time)
430 requires
431 requires(const std::chrono::time_point<Clock, Duration> &t) {
432 // the clock can be converted to system_clock
433 std::chrono::clock_cast<std::chrono::system_clock>(t);
434 // the duration can be converted to milliseconds
435 requires std::is_convertible_v<Duration, std::chrono::milliseconds>;
436 }
437 {
438 const auto sysTime = std::chrono::clock_cast<std::chrono::system_clock>(time);
439 // clock_cast can change the duration, so convert it again to milliseconds
440 const auto timeInMSec = std::chrono::time_point_cast<std::chrono::milliseconds>(sysTime);
441 return fromMSecsSinceEpoch(timeInMSec.time_since_epoch().count(), Qt::UTC);
442 }
443#endif // __cpp_concepts
444
445 // local_time
446 QT_POST_CXX17_API_IN_EXPORTED_CLASS
447 static QDateTime fromStdTimePoint(const std::chrono::local_time<std::chrono::milliseconds> &time)
448 {
449 return fromStdLocalTime(time);
450 }
451
452 QT_POST_CXX17_API_IN_EXPORTED_CLASS
453 static QDateTime fromStdLocalTime(const std::chrono::local_time<std::chrono::milliseconds> &time)
454 {
455 QDateTime result(QDate(1970, 1, 1), QTime(0, 0, 0));
456 return result.addMSecs(time.time_since_epoch().count());
457 }
458
459#if QT_CONFIG(timezone) && (__cpp_lib_chrono >= 201907L || defined(Q_QDOC))
460 // zoned_time. defined in qtimezone.h
461 QT_POST_CXX17_API_IN_EXPORTED_CLASS
462 static QDateTime fromStdZonedTime(const std::chrono::zoned_time<
463 std::chrono::milliseconds,
464 const std::chrono::time_zone *
465 > &time);
466#endif // QT_CONFIG(timezone)
467
468 QT_POST_CXX17_API_IN_EXPORTED_CLASS
469 std::chrono::sys_time<std::chrono::milliseconds> toStdSysMilliseconds() const
470 {
471 const std::chrono::milliseconds duration(toMSecsSinceEpoch());
472 return std::chrono::sys_time<std::chrono::milliseconds>(duration);
473 }
474
475 QT_POST_CXX17_API_IN_EXPORTED_CLASS
476 std::chrono::sys_seconds toStdSysSeconds() const
477 {
478 const std::chrono::seconds duration(toSecsSinceEpoch());
479 return std::chrono::sys_seconds(duration);
480 }
481#endif // __cpp_lib_chrono >= 201907L
482
483 friend std::chrono::milliseconds operator-(const QDateTime &lhs, const QDateTime &rhs)
484 {
485 return std::chrono::milliseconds(rhs.msecsTo(lhs));
486 }
487
488 friend QDateTime operator+(const QDateTime &dateTime, std::chrono::milliseconds duration)
489 {
490 return dateTime.addMSecs(msecs: duration.count());
491 }
492
493 friend QDateTime operator+(std::chrono::milliseconds duration, const QDateTime &dateTime)
494 {
495 return dateTime + duration;
496 }
497
498 QDateTime &operator+=(std::chrono::milliseconds duration)
499 {
500 *this = addMSecs(msecs: duration.count());
501 return *this;
502 }
503
504 friend QDateTime operator-(const QDateTime &dateTime, std::chrono::milliseconds duration)
505 {
506 return dateTime.addMSecs(msecs: -duration.count());
507 }
508
509 QDateTime &operator-=(std::chrono::milliseconds duration)
510 {
511 *this = addMSecs(msecs: -duration.count());
512 return *this;
513 }
514
515 // (1<<63) ms is 292277024.6 (average Gregorian) years, counted from the start of 1970, so
516 // Last is floor(1970 + 292277024.6); no year 0, so First is floor(1970 - 1 - 292277024.6)
517 enum class YearRange : qint32 { First = -292275056, Last = +292278994 };
518
519private:
520 bool equals(const QDateTime &other) const;
521 bool precedes(const QDateTime &other) const;
522 friend class QDateTimePrivate;
523
524 Data d;
525
526 friend bool operator==(const QDateTime &lhs, const QDateTime &rhs) { return lhs.equals(other: rhs); }
527 friend bool operator!=(const QDateTime &lhs, const QDateTime &rhs) { return !(lhs == rhs); }
528 friend bool operator<(const QDateTime &lhs, const QDateTime &rhs) { return lhs.precedes(other: rhs); }
529 friend bool operator<=(const QDateTime &lhs, const QDateTime &rhs) { return !(rhs < lhs); }
530 friend bool operator>(const QDateTime &lhs, const QDateTime &rhs) { return rhs.precedes(other: lhs); }
531 friend bool operator>=(const QDateTime &lhs, const QDateTime &rhs) { return !(lhs < rhs); }
532
533#ifndef QT_NO_DATASTREAM
534 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
535 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
536#endif
537
538#if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
539 friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
540#endif
541};
542Q_DECLARE_SHARED(QDateTime)
543
544#ifndef QT_NO_DATASTREAM
545Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
546Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
547Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
548Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
549Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
550Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
551#endif // QT_NO_DATASTREAM
552
553#if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
554Q_CORE_EXPORT QDebug operator<<(QDebug, QDate);
555Q_CORE_EXPORT QDebug operator<<(QDebug, QTime);
556Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
557#endif
558
559// QDateTime is not noexcept for now -- to be revised once
560// timezone and calendaring support is added
561Q_CORE_EXPORT size_t qHash(const QDateTime &key, size_t seed = 0);
562Q_CORE_EXPORT size_t qHash(QDate key, size_t seed = 0) noexcept;
563Q_CORE_EXPORT size_t qHash(QTime key, size_t seed = 0) noexcept;
564
565QT_END_NAMESPACE
566
567#endif // QDATETIME_H
568

source code of qtbase/src/corelib/time/qdatetime.h