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Avoid recomputing DST-ness for time-zone when already known

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When a QDateTime is constructed it determines whether daylight-saving
time is in effect and records it in its status field. So consult that
cached answer first, before asking the time-zone backend to work out
the answer the slow way.

Change-Id: I1d380d41f28a9b866216ac0f65425c30a8988cac
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This commit is contained in:
Edward Welbourne 2022-09-01 18:24:30 +02:00
parent 6616823fb7
commit 6c624c80fd
1 changed files with 4 additions and 0 deletions
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4
src/corelib/time/qdatetime.cpp
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@ -3613,6 +3613,10 @@ bool QDateTime::isDaylightTime() const
break; break;
#else #else
Q_ASSERT(d->m_timeZone.isValid()); Q_ASSERT(d->m_timeZone.isValid());
if (auto dst = extractDaylightStatus(getStatus(d));
dst != QDateTimePrivate::UnknownDaylightTime) {
return dst == QDateTimePrivate::DaylightTime;
}
return d->m_timeZone.d->isDaylightTime(toMSecsSinceEpoch()); return d->m_timeZone.d->isDaylightTime(toMSecsSinceEpoch());
#endif // timezone #endif // timezone
case Qt::LocalTime: { case Qt::LocalTime: {