diff options
Diffstat (limited to 'src/corelib/time/qdatetime.cpp')
| -rw-r--r-- | src/corelib/time/qdatetime.cpp | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp index e34ce71212..31206f779d 100644 --- a/src/corelib/time/qdatetime.cpp +++ b/src/corelib/time/qdatetime.cpp @@ -386,7 +386,7 @@ static constexpr int daysInUsualMonth(int month) // (February isn't usual.) for technical reasons limited to between -784350574879 and 784354017364, which means from before 2 billion BCE to after 2 billion CE. - \sa QTime, QDateTime, QDateEdit, QDateTimeEdit, QCalendarWidget + \sa QTime, QDateTime, QDateTime::YearRange, QDateEdit, QDateTimeEdit, QCalendarWidget */ /*! @@ -2464,7 +2464,7 @@ static int qt_timezone() // - It also takes DST into account, so we need to adjust it to always // get the Standard Time offset. return -t.tm_gmtoff + (t.tm_isdst ? (long)SECS_PER_HOUR : 0L); -#elif defined(Q_OS_INTEGRITY) +#elif defined(Q_OS_INTEGRITY) || defined(Q_OS_RTEMS) return 0; #else return timezone; @@ -3272,9 +3272,10 @@ inline qint64 QDateTimePrivate::zoneMSecsToEpochMSecs(qint64 zoneMSecs, const QT provides functions for comparing datetimes and for manipulating a datetime by adding a number of seconds, days, months, or years. - QDateTime can describe datetimes with respect to \l{Qt::LocalTime}{local - time}, to \l{Qt::UTC}{UTC}, to a specified \l{Qt::OffsetFromUTC}{offset - from UTC} or to a specified \l{{Qt::TimeZone}{time zone}, in conjunction + QDateTime can describe datetimes with respect to + \l{Qt::LocalTime}{local time}, to \l{Qt::UTC}{UTC}, to a specified + \l{Qt::OffsetFromUTC}{offset from UTC} or to a specified + \l{Qt::TimeZone}{time zone}, in conjunction with the QTimeZone class. For example, a time zone of "Europe/Berlin" will apply the daylight-saving rules as used in Germany since 1970. In contrast, an offset from UTC of +3600 seconds is one hour ahead of UTC (usually @@ -3387,6 +3388,25 @@ inline qint64 QDateTimePrivate::zoneMSecsToEpochMSecs(qint64 zoneMSecs, const QT */ /*! + \enum QDateTime::YearRange + + This enumerated type describes the range of years (in the Gregorian + calendar) representable by QDateTime: + + \value First The later parts of this year are representable + \value Last The earlier parts of this year are representable + + All dates strictly between these two years are also representable. + Note, however, that the Gregorian Calendar has no year zero. + + \note QDate can describe dates in a wider range of years. For most + purposes, this makes little difference, as the range of years that QDateTime + can support reaches 292 million years either side of 1970. + + \sa isValid(), QDate +*/ + +/*! Constructs a null datetime (i.e. null date and null time). A null datetime is invalid, since the date is invalid. @@ -3534,7 +3554,7 @@ bool QDateTime::isNull() const hour, i.e. if the transition is at 2am and the clock goes forward to 3am then the time from 02:00:00 to 02:59:59.999 is considered to be invalid. - \sa QDate::isValid(), QTime::isValid() + \sa QDateTime::YearRange, QDate::isValid(), QTime::isValid() */ bool QDateTime::isValid() const |