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  1. Qt
  2. QTBUG-62285

QDateTimeAxis::setRange doesn't preserve the TimeSpec

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    Description

      If you use for instance UTC QDateTime and pass it to QDateTimeAxis::setRange, the time will changed internally to LocalTime, which will add an extra offset to time. For instance create a QDateTime like this 

          QDateTime minDt;
    QDateTime maxDt;
    minDt.setOffsetFromUtc(0);
    maxDt.setOffsetFromUtc(0);
    minDt.setMSecsSinceEpoch(0);
    maxDt.setMSecsSinceEpoch(8000);

      Where the value are like this

      minDt = QDateTime(1970-01-01 00:00:00.000 UTC Qt::TimeSpec(UTC)) , since epoc 0
maxDt = QDateTime(1970-01-01 00:00:08.000 UTC Qt::TimeSpec(UTC)) , since epoc 8000

      When these are passed to QDateTimeAxis::setRange, the maxDt will end up to this

      QDateTime(1970-01-01 02:00:08.000 FLE Standard Time Qt::TimeSpec(LocalTime))

      Which has extra 2 hours in my case. See also the image.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-94188 QDateTimeEdit cannot support general time-zones

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported
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              axelspoerl Axel Spoerl
              misalmel Mika Salmela
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                Updated:
                Resolved:

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