Public bug reported: For a set of timezones in tzdata-2016* Qt parser produces wrong result in Qt versions earlier than 5.6.
In kubuntu-16.04 xenial xerus the most annoying issue is broken digital clock plasmoid on the default KDE panel if system timezone is set to e.g. Asia/Novosibirsk. All Qt programs that attempts to convert time to non-default timezone are affected as well in xenial and earlier ubuntu released including ubuntu-14.04 LTS trusty. I consider the bug is nasty enough for updating Qt in LTS ubuntu releases. The upstream bug is https://bugreports.qt.io/browse/QTBUG-53071 "QTimeZone mishandles tzdata 2016b and later in Russia, Kazakhstan". The direct link to the patch that fixes the problem is https://codereview.qt-project.org/gitweb?p=qt/qtbase.git;a=patch;h=e9041c7fc1052167f1ec2df0ea9623059e55d00f I have rebuilt qtbase-opensource-src-5.5.1+dfsg (-16ubuntu7.1) from sources with the patch applied and the bug has gone away. A bit more details. I faced the problem with Kubuntu 16.04.1, x86_64. Asia/Novosibirsk has UTC+07:00 offset last a couple of months but KDE clock shows a time that has offset of 14 hours from the actual wall time, so it is rather unusable. Command line tool "date" reports correct local time. KDE digital clock works correctly in e.g. Asia/Krasnoyarsk timezone. It as a workaround if time transition history does not matter. Some other timezones affected by the bug (tzdata-2106f) file europe: Europe/Astrakhan Europe/Kirov Europe/Ulyanovsk Asia/Barnaul Asia/Novosibirsk Asia/Tomsk Asia/Novokuznetsk file asia: Asia/Almaty Asia/Qyzylorda Asia/Aqtobe Asia/Aqtau Asia/Oral A simple program to demonstrate the problem: #include <QDebug> #include <QTimeZone> #include <QDateTime> int main() { QTimeZone tz = QTimeZone(QTimeZone::systemTimeZoneId()); QDateTime current = QDateTime::currentDateTime(); qDebug() << "current offset" << tz.offsetFromUtc(current); return 0; } It reports 0 for incorrectly parsed timezones. The only thing that bothers me is that I had to disable tests when was rebuilding libqt5core5a_5.5.1+dfsg-16ubuntu7.1_amd64.deb using dpg-buildpackage. Otherwise I got error with cmake in tests/auto/cmake/. Cmake was unable to find qt libraries in the build tree. ** Affects: qtbase-opensource-src (Ubuntu) Importance: Undecided Status: New ** Tags: patch xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1622089 Title: timezone parser in qt-5.5 breaks KDE clock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1622089/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
