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/qcompare.h>
10#include <QtCore/qlocale.h>
11#include <QtCore/qnamespace.h>
12#include <QtCore/qshareddata.h>
13#include <QtCore/qstring.h>
14
15#include <limits>
16#include <chrono>
17
18#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
19Q_FORWARD_DECLARE_CF_TYPE(CFDate);
20Q_FORWARD_DECLARE_OBJC_CLASS(NSDate);
21#endif
22
23QT_BEGIN_NAMESPACE
24
25class QTimeZone;
26class QDateTime;
27
28class Q_CORE_EXPORT QDate
29{
30 explicit constexpr QDate(qint64 julianDay) : jd(julianDay) {}
31public:
32 constexpr QDate() : jd(nullJd()) {}
33 QDate(int y, int m, int d);
34 QDate(int y, int m, int d, QCalendar cal);
35#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
36 QT_POST_CXX17_API_IN_EXPORTED_CLASS
37 Q_IMPLICIT constexpr QDate(std::chrono::year_month_day date) noexcept
38 : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
39 {}
40
41 QT_POST_CXX17_API_IN_EXPORTED_CLASS
42 Q_IMPLICIT constexpr QDate(std::chrono::year_month_day_last date) noexcept
43 : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
44 {}
45
46 QT_POST_CXX17_API_IN_EXPORTED_CLASS
47 Q_IMPLICIT constexpr QDate(std::chrono::year_month_weekday date) noexcept
48 : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
49 {}
50
51 QT_POST_CXX17_API_IN_EXPORTED_CLASS
52 Q_IMPLICIT constexpr QDate(std::chrono::year_month_weekday_last date) noexcept
53 : jd(date.ok() ? stdSysDaysToJulianDay(date) : nullJd())
54 {}
55
56 QT_POST_CXX17_API_IN_EXPORTED_CLASS
57 static constexpr QDate fromStdSysDays(const std::chrono::sys_days &days) noexcept
58 {
59 return QDate(stdSysDaysToJulianDay(days));
60 }
61
62 QT_POST_CXX17_API_IN_EXPORTED_CLASS
63 constexpr std::chrono::sys_days toStdSysDays() const noexcept
64 {
65 const qint64 days = isValid() ? jd - unixEpochJd() : 0;
66 return std::chrono::sys_days(std::chrono::days(days));
67 }
68#endif
69
70 constexpr bool isNull() const { return !isValid(); }
71 constexpr bool isValid() const { return jd >= minJd() && jd <= maxJd(); }
72
73 // Gregorian-optimized:
74 int year() const;
75 int month() const;
76 int day() const;
77 int dayOfWeek() const;
78 int dayOfYear() const;
79 int daysInMonth() const;
80 int daysInYear() const;
81 int weekNumber(int *yearNum = nullptr) const; // ISO 8601, always Gregorian
82
83 int year(QCalendar cal) const;
84 int month(QCalendar cal) const;
85 int day(QCalendar cal) const;
86 int dayOfWeek(QCalendar cal) const;
87 int dayOfYear(QCalendar cal) const;
88 int daysInMonth(QCalendar cal) const;
89 int daysInYear(QCalendar cal) const;
90
91#if QT_DEPRECATED_SINCE(6, 9)
92 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
93 QDateTime startOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
94 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
95 QDateTime endOfDay(Qt::TimeSpec spec, int offsetSeconds = 0) const;
96#endif
97
98 QDateTime startOfDay(const QTimeZone &zone) const;
99 QDateTime endOfDay(const QTimeZone &zone) const;
100 QDateTime startOfDay() const;
101 QDateTime endOfDay() const;
102
103#if QT_CONFIG(datestring)
104 QString toString(Qt::DateFormat format = Qt::TextDate) const;
105 QString toString(const QString &format) const;
106 QString toString(const QString &format, QCalendar cal) const
107 { return toString(format: qToStringViewIgnoringNull(s: format), cal); }
108 QString toString(QStringView format) const;
109 QString toString(QStringView format, QCalendar cal) const;
110#endif
111 bool setDate(int year, int month, int day); // Gregorian-optimized
112 bool setDate(int year, int month, int day, QCalendar cal);
113
114 void getDate(int *year, int *month, int *day) const;
115
116 [[nodiscard]] QDate addDays(qint64 days) const;
117#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
118 QT_POST_CXX17_API_IN_EXPORTED_CLASS
119 [[nodiscard]] QDate addDuration(std::chrono::days days) const
120 {
121 return addDays(days.count());
122 }
123#endif
124 // Gregorian-optimized:
125 [[nodiscard]] QDate addMonths(int months) const;
126 [[nodiscard]] QDate addYears(int years) const;
127 [[nodiscard]] QDate addMonths(int months, QCalendar cal) const;
128 [[nodiscard]] QDate addYears(int years, QCalendar cal) const;
129 qint64 daysTo(QDate d) const;
130
131 static QDate currentDate();
132#if QT_CONFIG(datestring)
133 // No DateFormat accepts a two-digit year, so no need for baseYear:
134 static QDate fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
135 static QDate fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
136 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
137
138 // Accept calendar without over-ride of base year:
139 static QDate fromString(QStringView string, QStringView format, QCalendar cal)
140 { return fromString(string: string.toString(), format, baseYear: QLocale::DefaultTwoDigitBaseYear, cal); }
141 QT_CORE_INLINE_SINCE(6, 7)
142 static QDate fromString(const QString &string, QStringView format, QCalendar cal);
143 static QDate fromString(const QString &string, const QString &format, QCalendar cal)
144 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear: QLocale::DefaultTwoDigitBaseYear, cal); }
145
146 // Overriding base year is likely more common than overriding calendar (and
147 // likely to get more so, as the legacy base drops ever further behind us).
148 static QDate fromString(QStringView string, QStringView format,
149 int baseYear = QLocale::DefaultTwoDigitBaseYear)
150 { return fromString(string: string.toString(), format, baseYear); }
151 static QDate fromString(QStringView string, QStringView format,
152 int baseYear, QCalendar cal)
153 { return fromString(string: string.toString(), format, baseYear, cal); }
154 static QDate fromString(const QString &string, QStringView format,
155 int baseYear = QLocale::DefaultTwoDigitBaseYear);
156 static QDate fromString(const QString &string, QStringView format,
157 int baseYear, QCalendar cal);
158 static QDate fromString(const QString &string, const QString &format,
159 int baseYear = QLocale::DefaultTwoDigitBaseYear)
160 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear); }
161 static QDate fromString(const QString &string, const QString &format,
162 int baseYear, QCalendar cal)
163 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear, cal); }
164#endif
165 static bool isValid(int y, int m, int d);
166 static bool isLeapYear(int year);
167
168 static constexpr inline QDate fromJulianDay(qint64 jd_)
169 { return jd_ >= minJd() && jd_ <= maxJd() ? QDate(jd_) : QDate() ; }
170 constexpr inline qint64 toJulianDay() const { return jd; }
171
172private:
173 // using extra parentheses around min to avoid expanding it if it is a macro
174 static constexpr inline qint64 nullJd() { return (std::numeric_limits<qint64>::min)(); }
175 static constexpr inline qint64 minJd() { return Q_INT64_C(-784350574879); }
176 static constexpr inline qint64 maxJd() { return Q_INT64_C( 784354017364); }
177 static constexpr inline qint64 unixEpochJd() { return Q_INT64_C(2440588); }
178
179#if __cpp_lib_chrono >= 201907L
180#if !QT_CORE_REMOVED_SINCE(6, 7)
181 QT_POST_CXX17_API_IN_EXPORTED_CLASS
182#endif
183 static constexpr qint64
184 stdSysDaysToJulianDay(const std::chrono::sys_days &days) noexcept
185 {
186 const auto epochDays = days.time_since_epoch().count();
187 // minJd() and maxJd() fit into 40 bits.
188 if constexpr (sizeof(epochDays) * CHAR_BIT >= 41) {
189 constexpr auto top = maxJd() - unixEpochJd();
190 constexpr auto bottom = minJd() - unixEpochJd();
191 if (epochDays > top || epochDays < bottom)
192 return nullJd();
193 }
194 return unixEpochJd() + epochDays;
195 }
196#endif // __cpp_lib_chrono >= 201907L
197
198 qint64 jd;
199
200 friend class QDateTime;
201 friend class QDateTimeParser;
202 friend class QDateTimePrivate;
203
204 friend constexpr bool comparesEqual(const QDate &lhs, const QDate &rhs) noexcept
205 { return lhs.jd == rhs.jd; }
206 friend constexpr Qt::strong_ordering
207 compareThreeWay(const QDate &lhs, const QDate &rhs) noexcept
208 { return Qt::compareThreeWay(lhs: lhs.jd, rhs: rhs.jd); }
209 Q_DECLARE_STRONGLY_ORDERED_LITERAL_TYPE(QDate)
210
211#ifndef QT_NO_DATASTREAM
212 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
213 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
214#endif
215};
216Q_DECLARE_TYPEINFO(QDate, Q_RELOCATABLE_TYPE);
217
218class Q_CORE_EXPORT QTime
219{
220 explicit constexpr QTime(int ms) : mds(ms)
221 {}
222public:
223 constexpr QTime(): mds(NullTime)
224 {}
225 QTime(int h, int m, int s = 0, int ms = 0);
226
227 constexpr bool isNull() const { return mds == NullTime; }
228 bool isValid() const;
229
230 int hour() const;
231 int minute() const;
232 int second() const;
233 int msec() const;
234#if QT_CONFIG(datestring)
235 QString toString(Qt::DateFormat f = Qt::TextDate) const;
236 QString toString(const QString &format) const
237 { return toString(format: qToStringViewIgnoringNull(s: format)); }
238 QString toString(QStringView format) const;
239#endif
240 bool setHMS(int h, int m, int s, int ms = 0);
241
242 [[nodiscard]] QTime addSecs(int secs) const;
243 int secsTo(QTime t) const;
244 [[nodiscard]] QTime addMSecs(int ms) const;
245 int msecsTo(QTime t) const;
246
247 static constexpr inline QTime fromMSecsSinceStartOfDay(int msecs) { return QTime(msecs); }
248 constexpr inline int msecsSinceStartOfDay() const { return mds == NullTime ? 0 : mds; }
249
250 static QTime currentTime();
251#if QT_CONFIG(datestring)
252 static QTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
253 static QTime fromString(QStringView string, QStringView format)
254 { return fromString(string: string.toString(), format); }
255 static QTime fromString(const QString &string, QStringView format);
256 static QTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
257 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
258 static QTime fromString(const QString &string, const QString &format)
259 { return fromString(string, format: qToStringViewIgnoringNull(s: format)); }
260#endif
261 static bool isValid(int h, int m, int s, int ms = 0);
262
263private:
264 enum TimeFlag { NullTime = -1 };
265 constexpr inline int ds() const { return mds == -1 ? 0 : mds; }
266 int mds;
267
268 friend constexpr bool comparesEqual(const QTime &lhs, const QTime &rhs) noexcept
269 { return lhs.mds == rhs.mds; }
270 friend constexpr Qt::strong_ordering
271 compareThreeWay(const QTime &lhs, const QTime &rhs) noexcept
272 { return Qt::compareThreeWay(lhs: lhs.mds, rhs: rhs.mds); }
273 Q_DECLARE_STRONGLY_ORDERED_LITERAL_TYPE(QTime)
274
275 friend class QDateTime;
276 friend class QDateTimePrivate;
277#ifndef QT_NO_DATASTREAM
278 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
279 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
280#endif
281};
282Q_DECLARE_TYPEINFO(QTime, Q_RELOCATABLE_TYPE);
283
284class QDateTimePrivate;
285
286class Q_CORE_EXPORT QDateTime
287{
288 struct ShortData {
289#if QT_VERSION >= QT_VERSION_CHECK(7,0,0) || defined(QT_BOOTSTRAPPED)
290# if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
291 qint64 status : 8;
292# endif
293 qint64 msecs : 56;
294
295# if Q_BYTE_ORDER == Q_BIG_ENDIAN
296 qint64 status : 8;
297# endif
298#else
299# if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
300 quintptr status : 8;
301# endif
302 // note: this is only 24 bits on 32-bit systems...
303 qintptr msecs : sizeof(void *) * 8 - 8;
304
305# if Q_BYTE_ORDER == Q_BIG_ENDIAN
306 quintptr status : 8;
307# endif
308#endif
309 friend constexpr bool operator==(ShortData lhs, ShortData rhs)
310 { return lhs.status == rhs.status && lhs.msecs == rhs.msecs; }
311 };
312
313 union Data {
314 // To be of any use, we need at least 60 years around 1970, which
315 // is 1,893,456,000,000 ms. That requires 41 bits to store, plus
316 // the sign bit. With the status byte, the minimum size is 50 bits.
317 static constexpr bool CanBeSmall = sizeof(ShortData) * 8 > 50;
318
319 Data() noexcept;
320 Data(const QTimeZone &);
321 Data(const Data &other) noexcept;
322 Data(Data &&other) noexcept;
323 Data &operator=(const Data &other) noexcept;
324 Data &operator=(Data &&other) noexcept { swap(other); return *this; }
325 ~Data();
326
327 void swap(Data &other) noexcept
328 { std::swap(a&: data, b&: other.data); }
329
330 bool isShort() const;
331 inline void invalidate();
332 void detach();
333 QTimeZone timeZone() const;
334
335 const QDateTimePrivate *operator->() const;
336 QDateTimePrivate *operator->();
337
338 QDateTimePrivate *d;
339 ShortData data;
340 };
341
342public:
343 QDateTime() noexcept;
344
345 enum class TransitionResolution {
346 Reject = 0,
347 RelativeToBefore,
348 RelativeToAfter,
349 PreferBefore,
350 PreferAfter,
351 PreferStandard,
352 PreferDaylightSaving,
353 // Closest match to behavior prior to introducing TransitionResolution:
354 LegacyBehavior = RelativeToBefore
355 };
356
357#if QT_DEPRECATED_SINCE(6, 9)
358 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead")
359 QDateTime(QDate date, QTime time, Qt::TimeSpec spec, int offsetSeconds = 0);
360#endif
361#if QT_CORE_REMOVED_SINCE(6, 7)
362 QDateTime(QDate date, QTime time, const QTimeZone &timeZone);
363 QDateTime(QDate date, QTime time);
364#endif
365 QDateTime(QDate date, QTime time, const QTimeZone &timeZone,
366 TransitionResolution resolve = TransitionResolution::LegacyBehavior);
367 QDateTime(QDate date, QTime time,
368 TransitionResolution resolve = TransitionResolution::LegacyBehavior);
369 QDateTime(const QDateTime &other) noexcept;
370 QDateTime(QDateTime &&other) noexcept;
371 ~QDateTime();
372
373 QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QDateTime)
374 QDateTime &operator=(const QDateTime &other) noexcept;
375
376 void swap(QDateTime &other) noexcept { d.swap(other&: other.d); }
377
378 bool isNull() const;
379 bool isValid() const;
380
381 QDate date() const;
382 QTime time() const;
383 Qt::TimeSpec timeSpec() const;
384 int offsetFromUtc() const;
385 QTimeZone timeRepresentation() const;
386#if QT_CONFIG(timezone)
387 QTimeZone timeZone() const;
388#endif // timezone
389 QString timeZoneAbbreviation() const;
390 bool isDaylightTime() const;
391
392 qint64 toMSecsSinceEpoch() const;
393 qint64 toSecsSinceEpoch() const;
394
395#if QT_CORE_REMOVED_SINCE(6, 7)
396 void setDate(QDate date);
397 void setTime(QTime time);
398#endif
399 void setDate(QDate date, TransitionResolution resolve = TransitionResolution::LegacyBehavior);
400 void setTime(QTime time, TransitionResolution resolve = TransitionResolution::LegacyBehavior);
401
402#if QT_DEPRECATED_SINCE(6, 9)
403 QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
404 void setTimeSpec(Qt::TimeSpec spec);
405 QT_DEPRECATED_VERSION_X_6_9("Use setTimeZone() instead")
406 void setOffsetFromUtc(int offsetSeconds);
407#endif
408#if QT_CORE_REMOVED_SINCE(6, 7)
409 void setTimeZone(const QTimeZone &toZone);
410#endif
411 void setTimeZone(const QTimeZone &toZone,
412 TransitionResolution resolve = TransitionResolution::LegacyBehavior);
413 void setMSecsSinceEpoch(qint64 msecs);
414 void setSecsSinceEpoch(qint64 secs);
415
416#if QT_CONFIG(datestring)
417 QString toString(Qt::DateFormat format = Qt::TextDate) const;
418 QString toString(const QString &format) const;
419 QString toString(const QString &format, QCalendar cal) const
420 { return toString(format: qToStringViewIgnoringNull(s: format), cal); }
421 QString toString(QStringView format) const;
422 QString toString(QStringView format, QCalendar cal) const;
423#endif
424 [[nodiscard]] QDateTime addDays(qint64 days) const;
425 [[nodiscard]] QDateTime addMonths(int months) const;
426 [[nodiscard]] QDateTime addYears(int years) const;
427 [[nodiscard]] QDateTime addSecs(qint64 secs) const;
428 [[nodiscard]] QDateTime addMSecs(qint64 msecs) const;
429 [[nodiscard]] QDateTime addDuration(std::chrono::milliseconds msecs) const
430 {
431 return addMSecs(msecs: msecs.count());
432 }
433
434#if QT_DEPRECATED_SINCE(6, 9)
435 QT_DEPRECATED_VERSION_X_6_9("Use toTimeZone instead")
436 QDateTime toTimeSpec(Qt::TimeSpec spec) const;
437#endif
438 QDateTime toLocalTime() const;
439 QDateTime toUTC() const;
440 QDateTime toOffsetFromUtc(int offsetSeconds) const;
441 QDateTime toTimeZone(const QTimeZone &toZone) const;
442
443 qint64 daysTo(const QDateTime &) const;
444 qint64 secsTo(const QDateTime &) const;
445 qint64 msecsTo(const QDateTime &) const;
446
447 static QDateTime currentDateTime(const QTimeZone &zone);
448 static QDateTime currentDateTime();
449 static QDateTime currentDateTimeUtc();
450#if QT_CONFIG(datestring)
451 // No DateFormat accepts a two-digit year, so no need for baseYear:
452 static QDateTime fromString(QStringView string, Qt::DateFormat format = Qt::TextDate);
453 static QDateTime fromString(const QString &string, Qt::DateFormat format = Qt::TextDate)
454 { return fromString(string: qToStringViewIgnoringNull(s: string), format); }
455
456 // Accept calendar without over-ride of base year:
457 static QDateTime fromString(QStringView string, QStringView format, QCalendar cal)
458 { return fromString(string: string.toString(), format, baseYear: QLocale::DefaultTwoDigitBaseYear, cal); }
459 QT_CORE_INLINE_SINCE(6, 7)
460 static QDateTime fromString(const QString &string, QStringView format, QCalendar cal);
461 static QDateTime fromString(const QString &string, const QString &format, QCalendar cal)
462 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear: QLocale::DefaultTwoDigitBaseYear, cal); }
463
464 // Overriding base year is likely more common than overriding calendar (and
465 // likely to get more so, as the legacy base drops ever further behind us).
466 static QDateTime fromString(QStringView string, QStringView format,
467 int baseYear = QLocale::DefaultTwoDigitBaseYear)
468 { return fromString(string: string.toString(), format, baseYear); }
469 static QDateTime fromString(QStringView string, QStringView format,
470 int baseYear, QCalendar cal)
471 { return fromString(string: string.toString(), format, baseYear, cal); }
472 static QDateTime fromString(const QString &string, QStringView format,
473 int baseYear = QLocale::DefaultTwoDigitBaseYear);
474 static QDateTime fromString(const QString &string, QStringView format,
475 int baseYear, QCalendar cal);
476 static QDateTime fromString(const QString &string, const QString &format,
477 int baseYear = QLocale::DefaultTwoDigitBaseYear)
478 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear); }
479 static QDateTime fromString(const QString &string, const QString &format,
480 int baseYear, QCalendar cal)
481 { return fromString(string, format: qToStringViewIgnoringNull(s: format), baseYear, cal); }
482#endif
483
484#if QT_DEPRECATED_SINCE(6, 9)
485 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
486 static QDateTime fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int offsetFromUtc = 0);
487 QT_DEPRECATED_VERSION_X_6_9("Pass QTimeZone instead of time-spec, offset")
488 static QDateTime fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offsetFromUtc = 0);
489#endif
490
491 static QDateTime fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone);
492 static QDateTime fromSecsSinceEpoch(qint64 secs, const QTimeZone &timeZone);
493 static QDateTime fromMSecsSinceEpoch(qint64 msecs);
494 static QDateTime fromSecsSinceEpoch(qint64 secs);
495
496 static qint64 currentMSecsSinceEpoch() noexcept;
497 static qint64 currentSecsSinceEpoch() noexcept;
498
499#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
500 static QDateTime fromCFDate(CFDateRef date);
501 CFDateRef toCFDate() const Q_DECL_CF_RETURNS_RETAINED;
502 static QDateTime fromNSDate(const NSDate *date);
503 NSDate *toNSDate() const Q_DECL_NS_RETURNS_AUTORELEASED;
504#endif
505
506 static QDateTime fromStdTimePoint(
507 std::chrono::time_point<
508 std::chrono::system_clock,
509 std::chrono::milliseconds
510 > time
511 );
512
513#if __cpp_lib_chrono >= 201907L || defined(Q_QDOC)
514#if __cpp_concepts >= 201907L || defined(Q_QDOC)
515private:
516 // The duration type of the result of a clock_cast<system_clock>.
517 // This duration may differ from the duration of the input.
518 template <typename Clock, typename Duration>
519 using system_clock_cast_duration = decltype(
520 std::chrono::clock_cast<std::chrono::system_clock>(
521 std::declval<const std::chrono::time_point<Clock, Duration> &>()
522 ).time_since_epoch()
523 );
524
525public:
526 // Generic clock, as long as it's compatible with us (= system_clock)
527 template <typename Clock, typename Duration>
528 static QDateTime fromStdTimePoint(const std::chrono::time_point<Clock, Duration> &time)
529 requires
530 requires(const std::chrono::time_point<Clock, Duration> &t) {
531 // the clock can be converted to system_clock
532 std::chrono::clock_cast<std::chrono::system_clock>(t);
533 // after the conversion to system_clock, the duration type
534 // we get is convertible to milliseconds
535 requires std::is_convertible_v<
536 system_clock_cast_duration<Clock, Duration>,
537 std::chrono::milliseconds
538 >;
539 }
540 {
541 using namespace std::chrono;
542 const sys_time<milliseconds> sysTime = clock_cast<system_clock>(time);
543 return fromStdTimePoint(sysTime);
544 }
545#endif // __cpp_concepts
546
547 // local_time
548 QT_POST_CXX17_API_IN_EXPORTED_CLASS
549 static QDateTime fromStdTimePoint(const std::chrono::local_time<std::chrono::milliseconds> &time)
550 {
551 return fromStdLocalTime(time);
552 }
553
554 QT_POST_CXX17_API_IN_EXPORTED_CLASS
555 static QDateTime fromStdLocalTime(const std::chrono::local_time<std::chrono::milliseconds> &time)
556 {
557 QDateTime result(QDate(1970, 1, 1), QTime(0, 0, 0), TransitionResolution::LegacyBehavior);
558 return result.addMSecs(time.time_since_epoch().count());
559 }
560
561#if QT_CONFIG(timezone) && (__cpp_lib_chrono >= 201907L || defined(Q_QDOC))
562 // zoned_time. defined in qtimezone.h
563 QT_POST_CXX17_API_IN_EXPORTED_CLASS
564 static QDateTime fromStdZonedTime(const std::chrono::zoned_time<
565 std::chrono::milliseconds,
566 const std::chrono::time_zone *
567 > &time);
568#endif // QT_CONFIG(timezone)
569
570 QT_POST_CXX17_API_IN_EXPORTED_CLASS
571 std::chrono::sys_time<std::chrono::milliseconds> toStdSysMilliseconds() const
572 {
573 const std::chrono::milliseconds duration(toMSecsSinceEpoch());
574 return std::chrono::sys_time<std::chrono::milliseconds>(duration);
575 }
576
577 QT_POST_CXX17_API_IN_EXPORTED_CLASS
578 std::chrono::sys_seconds toStdSysSeconds() const
579 {
580 const std::chrono::seconds duration(toSecsSinceEpoch());
581 return std::chrono::sys_seconds(duration);
582 }
583#endif // __cpp_lib_chrono >= 201907L
584
585 friend std::chrono::milliseconds operator-(const QDateTime &lhs, const QDateTime &rhs)
586 {
587 return std::chrono::milliseconds(rhs.msecsTo(lhs));
588 }
589
590 friend QDateTime operator+(const QDateTime &dateTime, std::chrono::milliseconds duration)
591 {
592 return dateTime.addMSecs(msecs: duration.count());
593 }
594
595 friend QDateTime operator+(std::chrono::milliseconds duration, const QDateTime &dateTime)
596 {
597 return dateTime + duration;
598 }
599
600 QDateTime &operator+=(std::chrono::milliseconds duration)
601 {
602 *this = addMSecs(msecs: duration.count());
603 return *this;
604 }
605
606 friend QDateTime operator-(const QDateTime &dateTime, std::chrono::milliseconds duration)
607 {
608 return dateTime.addMSecs(msecs: -duration.count());
609 }
610
611 QDateTime &operator-=(std::chrono::milliseconds duration)
612 {
613 *this = addMSecs(msecs: -duration.count());
614 return *this;
615 }
616
617 // (1<<63) ms is 292277024.6 (average Gregorian) years, counted from the start of 1970, so
618 // Last is floor(1970 + 292277024.6); no year 0, so First is floor(1970 - 1 - 292277024.6)
619 enum class YearRange : qint32 { First = -292275056, Last = +292278994 };
620
621private:
622 bool equals(const QDateTime &other) const;
623#if QT_CORE_REMOVED_SINCE(6, 7)
624 bool precedes(const QDateTime &other) const;
625#endif
626 friend class QDateTimePrivate;
627
628 Data d;
629
630 friend bool comparesEqual(const QDateTime &lhs, const QDateTime &rhs)
631 { return lhs.equals(other: rhs); }
632 friend Q_CORE_EXPORT Qt::weak_ordering
633 compareThreeWay(const QDateTime &lhs, const QDateTime &rhs);
634 Q_DECLARE_WEAKLY_ORDERED_NON_NOEXCEPT(QDateTime)
635
636#ifndef QT_NO_DATASTREAM
637 friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
638 friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
639#endif
640
641#if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
642 friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
643#endif
644};
645Q_DECLARE_SHARED(QDateTime)
646
647#ifndef QT_NO_DATASTREAM
648Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
649Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
650Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QTime);
651Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
652Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
653Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
654#endif // QT_NO_DATASTREAM
655
656#if !defined(QT_NO_DEBUG_STREAM) && QT_CONFIG(datestring)
657Q_CORE_EXPORT QDebug operator<<(QDebug, QDate);
658Q_CORE_EXPORT QDebug operator<<(QDebug, QTime);
659Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
660#endif
661
662// QDateTime is not noexcept for now -- to be revised once
663// timezone and calendaring support is added
664Q_CORE_EXPORT size_t qHash(const QDateTime &key, size_t seed = 0);
665Q_CORE_EXPORT size_t qHash(QDate key, size_t seed = 0) noexcept;
666Q_CORE_EXPORT size_t qHash(QTime key, size_t seed = 0) noexcept;
667
668#if QT_CONFIG(datestring) && QT_CORE_INLINE_IMPL_SINCE(6, 7)
669QDate QDate::fromString(const QString &string, QStringView format, QCalendar cal)
670{
671 return fromString(string, format, baseYear: QLocale::DefaultTwoDigitBaseYear, cal);
672}
673
674QDateTime QDateTime::fromString(const QString &string, QStringView format, QCalendar cal)
675{
676 return fromString(string, format, baseYear: QLocale::DefaultTwoDigitBaseYear, cal);
677}
678#endif
679
680QT_END_NAMESPACE
681
682#endif // QDATETIME_H
683

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