https://bugs.kde.org/show_bug.cgi?id=511521
Bug ID: 511521
Summary: KDE Date/Clock widget displays incorrect UTC time just
before the end of daylight saving time
Classification: Plasma
Product: plasmashell
Version First 6.4.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Digital Clock widget
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
SUMMARY
I set my display clock to only show UTC, while my system timezone is set to US
Eastern Time. I knew the end of DST was coming today, 2025-11-02, but last
night before the switch at about 2025-11-01 23:50 EDT, I noticed that the clock
displayed an incorrect time for UTC: 2025-11-02 2:50 UTC. As EDT is UTC-4, this
is a clearly incorrect result. My theory is that the UTC clock is being updated
by adding 4 hours to EDT, which crosses the boundary when the clock is switched
to EST at 02:00 EDT / 01:00 EST, so it subtracts 1 hour to compensate.
STEPS TO REPRODUCE
1. Set primary timezone to "America/New York" or similar timezone, e.g. through
timedatectl.
2. Set Digital Clock widget to display UTC.
3. Set system time to 2025-11-02 03:00 UTC, e.g. through timedatectl.
OBSERVED RESULT
UTC is an hour earlier than it should be while system clock is in daylight
time.
After the switch to standard time UTC is displayed correctly.
Output of date:
2025年 11月 1日 土曜日 23:07:41 EDT
Output of date -u:
2025年 11月 2日 日曜日 03:08:07 UTC
Output of timedatectl show:
Timezone=America/New_York
LocalRTC=no
CanNTP=yes
NTP=no
NTPSynchronized=no
TimeUSec=Sat 2025-11-01 23:03:43 EDT
RTCTimeUSec=Sat 2025-11-01 23:03:44 EDT
Clock widget display:
2:09 (UTC)
2025年 11月 2日 日曜日
EXPECTED RESULT
UTC is always displayed correctly.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.12.50-1-lts (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700X 8-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 6700 XT
ADDITIONAL INFORMATION
My date language is set to "ja_JP.UTF-8" and the digital clock is set to
display 24hr time, but I don't feel that should affect anything.
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