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  1. Qt
  2. QTBUG-130278

[Reg 6.7.2 -> 6.8.0][macOS] QLocale::LongFormat no longer produces reversible conversion between QDateTime and QString

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Details

    • Bug
    • Resolution: Unresolved
    • P1: Critical
    • None
    • 6.8.0
    • Core: Locales (i18n)
    • macOS 13.5.2 (M1 CPU), Xcode 14.3, en_AU system locale
    • All, macOS
    • 25
    • Foundation Sprint 118, Foundation Sprint 119, Foundation Sprint 120, Foundation Sprint 121, Foundation Sprint 122, Foundation Sprint 123, Foundation Sprint 124, Foundation Sprint 125, Foundation Sprint 126, Foundation Sprint 127

    Description

      Code

      #include <QDateTime>
#include <QLocale>

int main()
{
    QLocale deLocale{QLocale::German, QLocale::Germany};

    const auto dt = QDateTime(QDate(2024, 05, 06), QTime(12, 34));
    const auto str = deLocale.toString(dt, QLocale::LongFormat);
    const auto parsed = deLocale.toDateTime(str, QLocale::LongFormat);

    qDebug() << "Original timestamp:" << dt;
    qDebug() << "Long format string:" << str;
    qDebug() << "Parsed timestamp:" << parsed;

    Q_ASSERT(parsed.isValid());
}

       

      Correct result (Qt 6.7.2, macOS)

      Original timestamp: QDateTime(2024-05-06 12:34:00.000 GMT+8 Qt::LocalTime)
Long format string: "Montag, 6. Mai 2024 12:34:00 GMT+8"
Parsed timestamp: QDateTime(2024-05-06 12:34:00.000 GMT+8 Qt::LocalTime)

       

      Wrong result (Qt 6.8.0, macOS)

      Original timestamp: QDateTime(2024-05-06 12:34:00.000 GMT+8 Qt::LocalTime)
Long format string: "Montag, 6. Mai 2024 12:34:00 Westaustralische Normalzeit"
Parsed timestamp: QDateTime(Invalid)

      Assertion fails

       

      For comparison (Qt 6.7.2 and 6.8.0, Windows 10 22H2)
      I'm not sure whether this is considered fully correct or not.

      • The result of QLocale::toDateTime() is correct, but
      • The result of QLocale::toString() contains a mixture of German and English
      Original timestamp: QDateTime(2024-05-06 12:34:00.000 W. Australia Standard Time Qt::LocalTime)
Long format string: "Montag, 6. Mai 2024 12:34:00 W. Australia Standard Time"
Parsed timestamp: QDateTime(2024-05-06 12:34:00.000 W. Australia Standard Time Qt::LocalTime)

      Attachments

        Issue Links

          is blocked by

          Task - A task that needs to be done. QTQAINFRA-6901 Please update timezone package on sles-15_sp5-minimal-static Coin config

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • In Progress
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-131348 Parsing timezone long names gets the wrong IANA ID for a metazone name

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          For Gerrit Dashboard: QTBUG-130278
          # Subject Branch Project Status CR V
          599915,31 Fix long-form zone parts in date-time strings dev qt/qtbase Status: NEW 0 0

          Activity

            People

              Eddy Edward Welbourne
              skoh-qt Sze Howe Koh
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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              Dates

                Created:
                Updated:

                Gerrit Reviews

                  There is 1 open Gerrit change