timezone parser in qt-5.5 breaks KDE clock
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| qtbase-opensource-src (Ubuntu) |
Fix Released
|
Undecided
|
Timo Jyrinki | ||
| Xenial |
Fix Released
|
Undecided
|
Timo Jyrinki | ||
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:/
"QTimeZone mishandles tzdata 2016b and later in Russia, Kazakhstan".
The direct link to the patch that fixes the problem is
https:/
I have rebuilt qtbase-
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(
QDateTime current = QDateTime:
qDebug() << "current offset" << tz.offsetFromUt
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_
using dpg-buildpackage. Otherwise I got error with cmake
in tests/auto/cmake/. Cmake was unable to find qt libraries
in the build tree.
| Timo Jyrinki (timo-jyrinki) wrote | #1 |
| Changed in qtbase-opensource-src (Ubuntu): | |
| status: | New → Confirmed |
| Changed in qtbase-opensource-src (Ubuntu Xenial): | |
| status: | New → Confirmed |
| Changed in qtbase-opensource-src (Ubuntu): | |
| assignee: | nobody → Timo Jyrinki (timo-jyrinki) |
| Changed in qtbase-opensource-src (Ubuntu Xenial): | |
| assignee: | nobody → Timo Jyrinki (timo-jyrinki) |
| description: | updated |
| Launchpad Janitor (janitor) wrote | #2 |
| Changed in qtbase-opensource-src (Ubuntu): | |
| status: | Confirmed → Fix Released |
| Martin Pitt (pitti) wrote Please test proposed package | #3 |
| Changed in qtbase-opensource-src (Ubuntu Xenial): | |
| status: | Confirmed → Fix Committed |
| tags: | added: verification-needed |
| tags: |
added: kubuntul xenia removed: xenial |
| tags: |
added: kubuntu removed: kubuntul |
| tags: |
added: xenial removed: xenia |
| Max (m-gorodok) wrote | #4 |
| tags: |
added: verification-done removed: verification-needed |
| Flames_in_Paradise (ellisistfroh-deactivatedaccount) wrote | #5 |
| Brian Murray (brian-murray) wrote Update Released | #6 |
| Launchpad Janitor (janitor) wrote | #7 |
| Changed in qtbase-opensource-src (Ubuntu Xenial): | |
| status: | Fix Committed → Fix Released |
Sounds like a good candidate for stable release upgrade to 16.04 LTS. Thank you for the bug report!
It will take some time as it will first need to be landed to 16.10 (the patch is in Qt 5.6.2, 16.10 has 5.6.1), and then the SRU process (https:/
https:/