diff options
Diffstat (limited to 'src/corelib/tools/qdatetime.cpp')
| -rw-r--r-- | src/corelib/tools/qdatetime.cpp | 127 |
1 files changed, 107 insertions, 20 deletions
diff --git a/src/corelib/tools/qdatetime.cpp b/src/corelib/tools/qdatetime.cpp index 3e34d62..459d76a 100644 --- a/src/corelib/tools/qdatetime.cpp +++ b/src/corelib/tools/qdatetime.cpp @@ -2318,17 +2318,35 @@ void QDateTime::setTimeSpec(Qt::TimeSpec spec) } } -static uint toTime_tHelper(const QDate &utcDate, const QTime &utcTime) +qint64 toMSecsSinceEpoch_helper(qint64 jd, int msecs) { - int days = QDate(1970, 1, 1).daysTo(utcDate); - int secs = QTime().secsTo(utcTime); - if (days < 0 || (days == 0 && secs < 0)) - return uint(-1); + int days = jd - julianDayFromGregorianDate(1970, 1, 1); + qint64 retval = (qlonglong(days) * MSECS_PER_DAY) + msecs; + return retval; +} - qlonglong retval = (qlonglong(days) * SECS_PER_DAY) + secs; - if (retval >= Q_INT64_C(0xFFFFFFFF)) - return uint(-1); - return uint(retval); +/*! + \since 4.7 + + Returns the datetime as the number of milliseconds that have passed + since 1970-01-01T00:00:00.000, Coordinated Universal Time (Qt::UTC). + + On systems that do not support time zones, this function will + behave as if local time were Qt::UTC. + + The behavior for this function is undefined if the datetime stored in + this object is not valid. However, for all valid dates, this function + returns a unique value. + + \sa toTime_t(), setMSecsSinceEpoch() +*/ +qint64 QDateTime::toMSecsSinceEpoch() const +{ + QDate utcDate; + QTime utcTime; + d->getUTC(utcDate, utcTime); + + return toMSecsSinceEpoch_helper(utcDate.jd, utcTime.ds()); } /*! @@ -2338,16 +2356,63 @@ static uint toTime_tHelper(const QDate &utcDate, const QTime &utcTime) On systems that do not support time zones, this function will behave as if local time were Qt::UTC. - \sa setTime_t() + \note This function returns a 32-bit unsigned integer, so it does not + support dates before 1970, but it does support dates after + 2038-01-19T03:14:06, which may not be valid time_t values. Be careful + when passing those time_t values to system functions, which could + interpret them as negative dates. + + If the date is outside the range 1970-01-01T00:00:00 to + 2106-02-07T06:28:14, this function returns -1 cast to an unsigned integer + (i.e., 0xFFFFFFFF). + + To get an extended range, use toMSecsSinceEpoch(). + + \sa toMSecsSinceEpoch(), setTime_t() */ uint QDateTime::toTime_t() const { - QDate utcDate; - QTime utcTime; - d->getUTC(utcDate, utcTime); + qint64 retval = toMSecsSinceEpoch() / 1000; + if (quint64(retval) >= Q_UINT64_C(0xFFFFFFFF)) + return uint(-1); + return uint(retval); +} + +/*! + \since 4.7 - return toTime_tHelper(utcDate, utcTime); + Sets the date and time given the number of \a mulliseconds that have + passed since 1970-01-01T00:00:00.000, Coordinated Universal Time + (Qt::UTC). On systems that do not support time zones this function + will behave as if local time were Qt::UTC. + + Note that there are possible values for \a msecs that lie outside the + valid range of QDateTime, both negative and positive. The behavior of + this function is undefined for those values. + + \sa toMSecsSinceEpoch(), setTime_t() +*/ +void QDateTime::setMSecsSinceEpoch(qint64 msecs) +{ + detach(); + + QDateTimePrivate::Spec oldSpec = d->spec; + + int ddays = msecs / MSECS_PER_DAY; + msecs %= MSECS_PER_DAY; + if (msecs < 0) { + // negative + --ddays; + msecs += MSECS_PER_DAY; + } + + d->date = QDate(1970, 1, 1).addDays(ddays); + d->time = QTime().addMSecs(msecs); + d->spec = QDateTimePrivate::UTC; + + if (oldSpec != QDateTimePrivate::UTC) + d->spec = d->getLocal(d->date, d->time); } /*! @@ -2816,7 +2881,7 @@ bool QDateTime::operator<(const QDateTime &other) const */ /*! - \fn qint64 QDateTime::currentMsecsSinceEpoch() + \fn qint64 QDateTime::currentMSecsSinceEpoch() \since 4.7 Returns the number of milliseconds since 1970-01-01T00:00:00 Universal @@ -2879,7 +2944,7 @@ QDateTime QDateTime::currentDateTimeUtc() return QDateTime(d, t, Qt::UTC); } -qint64 QDateTime::currentMsecsSinceEpoch() +qint64 QDateTime::currentMSecsSinceEpoch() { QDate d; QTime t; @@ -2943,7 +3008,7 @@ QDateTime QDateTime::currentDateTimeUtc() return QDateTime(d, ct, Qt::UTC); } -qint64 QDateTime::currentMsecsSinceEpoch() +qint64 QDateTime::currentMSecsSinceEpoch() { QDate d; QTime ct; @@ -3060,7 +3125,7 @@ QDateTime QDateTime::currentDateTimeUtc() return dt; } -qint64 QDateTime::currentMsecsSinceEpoch() +qint64 QDateTime::currentMSecsSinceEpoch() { // posix compliant system // we have milliseconds @@ -3091,6 +3156,27 @@ QDateTime QDateTime::fromTime_t(uint seconds) } /*! + \since 4.7 + + Returns a datetime whose date and time are the number of milliseconds \a msec + that have passed since 1970-01-01T00:00:00.000, Coordinated Universal + Time (Qt::UTC). On systems that do not support time zones, the time + will be set as if local time were Qt::UTC. + + Note that there are possible values for \a msecs that lie outside the valid + range of QDateTime, both negative and positive. The behavior of this + function is undefined for those values. + + \sa toTime_t(), setTime_t() +*/ +QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs) +{ + QDateTime d; + d.setMSecsSinceEpoch(msecs); + return d; +} + +/*! \since 4.4 \internal @@ -3844,7 +3930,8 @@ static QDateTimePrivate::Spec utcToLocal(QDate &date, QTime &time) { QDate fakeDate = adjustDate(date); - time_t secsSince1Jan1970UTC = toTime_tHelper(fakeDate, time); + // won't overflow because of fakeDate + time_t secsSince1Jan1970UTC = toMSecsSinceEpoch_helper(fakeDate.toJulianDay(), QTime().msecsTo(time)) / 1000; tm *brokenDown = 0; #if defined(Q_OS_WINCE) @@ -3929,7 +4016,7 @@ static void localToUtc(QDate &date, QTime &time, int isdst) localTM.tm_year = fakeDate.year() - 1900; localTM.tm_isdst = (int)isdst; #if defined(Q_OS_WINCE) || defined(Q_OS_SYMBIAN) - time_t secsSince1Jan1970UTC = toTime_tHelper(fakeDate, time); + time_t secsSince1Jan1970UTC = toMSecsSinceEpoch_helper(fakeDate.toJulianDay(), QTime().msecsTo(time)); #else #if defined(Q_OS_WIN) _tzset(); |