[korganizer] [Bug 476642] Wrong calculation in week recurrence after 15 iterations

[Daniel Vrátil]

https://bugs.kde.org/show_bug.cgi?id=476642

--- Comment #3 from Daniel Vrátil <dvratil at kde.org> ---
Created attachment 163459
  --> https://bugs.kde.org/attachment.cgi?id=163459&action=edit
Screenshot from OpenSuse 15.5

Yes, 1st of November and 15th of November 2023, no occurence inbetween. I tried
on Debian 11, OpenSuse Leap 15, KDE Neon (current stable) and recent git
master, it looks as expected on all of them (see that attached screenshot from
my OpenSuse VM).

Does maybe the original event that you have in your calendar, have like a
specific time, or a timezone? Maybe even different timezone than your system?
What is your system timezone? Or is the original event an all-day event? What
distro do you use? I can try to reproduce in a VM. Is the event stored in
Google Calendar, CalDAV or local iCal file?

The only cases I can imagine that could suddenly break the recurrence for one
incidence are
1) accidental recurrence exception - maybe you accidentally moved the one
occurrence from 1st to 8th, which created a recurrence exception (you can check
in event editor -> Recurrence tab)
2) daylight saving time start/end in your or event's timezone somehow
interfering with the recurrence rule, causing this odd miscalculation

I can't think of anything else that could cause one calculation of the
recurrence to suddenly go wrong on an arbitrary date and then resume correctly
again.

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