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QDateTime daytime = QDateTime::currentDateTime();
QString strTime = daytime.toString("dd.MM.yyyy hh:mm:ss.zzz");
qDebug()<<strTime;
QDateTime daytime1 = QDateTime::fromString(strTime,"dd.MM.yyyy hh:mm:ss.zzz");
qDebug()<<daytime1;Public Functions
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| ? | QDateTime() |
| ? | QDateTime(const QDate &date) |
| ? | QDateTime(const QDate &date, const QTime &time, Qt::TimeSpec spec = Qt::LocalTime) |
| ? | QDateTime(const QDate &date, const QTime &time, Qt::TimeSpec spec, int offsetSeconds) |
| ? | QDateTime(const QDate &date, const QTime &time, const QTimeZone &timeZone) |
| ? | QDateTime(const QDateTime &other) |
| ? | ~QDateTime() |
| QDateTime | addDays(qint64 ndays) const |
| QDateTime | addMSecs(qint64 msecs) const |
| QDateTime | addMonths(int nmonths) const |
| QDateTime | addSecs(qint64 s) const |
| QDateTime | addYears(int nyears) const |
| QDate | date() const |
| qint64 | daysTo(const QDateTime &other) const |
| bool | isDaylightTime() const |
| bool | isNull() const |
| bool | isValid() const |
| qint64 | msecsTo(const QDateTime &other) const |
| int | offsetFromUtc() const |
| qint64 | secsTo(const QDateTime &other) const |
| void | setDate(const QDate &date) |
| void | setMSecsSinceEpoch(qint64 msecs) |
| void | setOffsetFromUtc(int offsetSeconds) |
| void | setTime(const QTime &time) |
| void | setTimeSpec(Qt::TimeSpec spec) |
| void | setTimeZone(const QTimeZone &toZone) |
| void | setTime_t(uint seconds) |
| void | swap(QDateTime &other) |
| QTime | time() const |
| Qt::TimeSpec | timeSpec() const |
| QTimeZone | timeZone() const |
| QString | timeZoneAbbreviation() const |
| CFDateRef | toCFDate() const |
| QDateTime | toLocalTime() const |
| qint64 | toMSecsSinceEpoch() const |
| NSDate * | toNSDate() const |
| QDateTime | toOffsetFromUtc(int offsetSeconds) const |
| QString | toString(const QString &format) const |
| QString | toString(Qt::DateFormat format = Qt::TextDate) const |
| QDateTime | toTimeSpec(Qt::TimeSpec spec) const |
| QDateTime | toTimeZone(const QTimeZone &timeZone) const |
| uint | toTime_t() const |
| QDateTime | toUTC() const |
| bool | operator!=(const QDateTime &other) const |
| bool | operator<(const QDateTime &other) const |
| bool | operator<=(const QDateTime &other) const |
| QDateTime & | operator=(QDateTime &&other) |
| QDateTime & | operator=(const QDateTime &other) |
| bool | operator==(const QDateTime &other) const |
| bool | operator>(const QDateTime &other) const |
| bool | operator>=(const QDateTime &other) const |
Static Public Members
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| QDateTime | currentDateTime() |
| QDateTime | currentDateTimeUtc() |
| qint64 | currentMSecsSinceEpoch() |
| QDateTime | fromCFDate(CFDateRef date) |
| QDateTime | fromMSecsSinceEpoch(qint64 msecs) |
| QDateTime | fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int offsetSeconds = 0) |
| QDateTime | fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone) |
| QDateTime | fromNSDate(const NSDate *date) |
| QDateTime | fromString(const QString &string, Qt::DateFormat format = Qt::TextDate) |
| QDateTime | fromString(const QString &string, const QString &format) |
| QDateTime | fromTime_t(uint seconds) |
| QDateTime | fromTime_t(uint seconds, Qt::TimeSpec spec, int offsetSeconds = 0) |
| QDateTime | fromTime_t(uint seconds, const QTimeZone &timeZone) |
Related Non-Members
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| QDataStream & | operator<<(QDataStream &out, const QDateTime &dateTime) |
| QDataStream & | operator>>(QDataStream &in, QDateTime &dateTime) |
Detailed Description
The QDateTime class provides date and time functions.
A QDateTime object contains a calendar date and a clock time (a "datetime"). It is a combination of the QDate and QTime classes. It can read the current datetime from the system clock. It provides functions for comparing datetimes and for manipulating a datetime by adding a number of seconds, days, months, or years.
A QDateTime object is typically created either by giving a date and time explicitly in the constructor, or by using the static function currentDateTime() that returns a QDateTime object set to the system clock's time. The date and time can be changed with setDate() and setTime(). A datetime can also be set using the setTime_t() function that takes a POSIX-standard "number of seconds since 00:00:00 on January 1, 1970" value. The fromString() function returns a QDateTime, given a string and a date format used to interpret the date within the string.
The date() and time() functions provide access to the date and time parts of the datetime. The same information is provided in textual format by the toString() function.
QDateTime provides a full set of operators to compare two QDateTime objects, where smaller means earlier and larger means later.
You can increment (or decrement) a datetime by a given number of milliseconds using addMSecs(), seconds using addSecs(), or days using addDays(). Similarly, you can use addMonths() and addYears(). The daysTo() function returns the number of days between two datetimes, secsTo() returns the number of seconds between two datetimes, and msecsTo() returns the number of milliseconds between two datetimes.
QDateTime can store datetimes as local time or as UTC. QDateTime::currentDateTime() returns a QDateTime expressed as local time; use toUTC() to convert it to UTC. You can also use timeSpec() to find out if a QDateTime object stores a UTC time or a local time. Operations such as addSecs() and secsTo() are aware of daylight-saving time (DST).
Note: QDateTime does not account for leap seconds.
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