https://bugs.kde.org/show_bug.cgi?id=521959
Bug ID: 521959
Summary: Vietnamese lunar calendar shows wrong date start from
2026-03-18
Classification: Plasma
Product: plasmashell
Version First 6.7.0
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Digital Clock widget
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
The Vietnamese lunar calendar added in Plasma 6.7 appears to be inconsistent
with the reference algorithm/source used by the original merge request.
The feature was added in kdeplasma-addons MR !1015:
https://invent.kde.org/plasma/kdeplasma-addons/-/merge_requests/1015
That MR says the algorithm is based on Hồ Ngọc Đức's work and references:
https://www.xemamlich.uhm.vn/calrules.html
For Gregorian date 18/03/2026, KDE Plasma shows the Vietnamese lunar date as
1/2. However, according to xemamlich.uhm.vn and the referenced algorithm, the
correct Vietnamese lunar date should be 30/1.
This looks like an off-by-one error around the new moon / lunar month boundary.
STEPS TO REPRODUCE
1. Use KDE Plasma 6.7 with kdeplasma-addons installed.
2. Add or configure the Digital Clock widget.
3. Enable the Vietnamese lunar calendar as the alternate calendar.
4. Open the calendar popup.
5. Navigate to March 2026.
6. Check the date 18 March 2026.
OBSERVED RESULT
KDE shows 18/03/2026 as Vietnamese lunar date 1/2.
EXPECTED RESULT
KDE should show 18/03/2026 as Vietnamese lunar date 30/1.
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20260618
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
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