MarsSeed [1] filed a deletion request for pineapple-calendar-git [2]: Discontinued since 2022. [a] Does not work with KDE Plasma 6.
According to upstream's notice in README:
Note: since Plasma 5.26, the Digital Clock plasmoid
comes from KDE now has built-in support for alternate
calendar!
[a]: https://github.com/BLumia/pineapple-calendar
[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/pineapple-calendar-git/
