With libqt5core5a 5.5.1+dfsg-16ubuntu7.2 I have no problem for the
Asia/Novosibirsk timezone.
Sorry for delay. I faced another bug that I did not noticed just after upgrade
to 16.04.
Now I see that missing cities such as Europe/Astrakhan or Asia/Barnaul in
digital clock
settings are unrelated to Qt version. The behavior is the same for
5.5.1+dfsg-16ubuntu7.1 and
for 5.5.1+dfsg-16ubuntu7.2.
Thank you for backporting of the fix.
$ LANG=C apt-cache policy libqt5core5a
libqt5core5a:
Installed: 5.5.1+dfsg-16ubuntu7.2
Candidate: 5.5.1+dfsg-16ubuntu7.2
Version table:
*** 5.5.1+dfsg-16ubuntu7.2 500
500 http://ru.archive.ubuntu.com/ubuntu xenial-proposed/main amd64
Packages
100 /var/lib/dpkg/status
5.5.1+dfsg-16ubuntu7.1 500
500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
5.5.1+dfsg-16ubuntu7 500
500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
** Tags removed: verification-needed
** Tags added: verification-done
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to qtbase-opensource-src in
Ubuntu.
https://bugs.launchpad.net/bugs/1622089
Title:
timezone parser in qt-5.5 breaks KDE clock
Status in qtbase-opensource-src package in Ubuntu:
Fix Released
Status in qtbase-opensource-src source package in Xenial:
Fix Committed
Bug description:
[ Impact ]
People in certain timezones have buggy time conversions in all Qt
apps.
[ Test Case ]
See bug report.
[ Regression Potential ]
Should be low, in upstream LTS release and includes unit tests during
build time.
--- original bug report ---
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1622089/+subscriptions
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