I guess this is a challengeĀ for Willi :
a module to typeset "dutch calendars"
as inĀ 
https://www.calendari.it/
(I am not involved at all with the site, it's the first I have found )

I like the slim version, with 3 months, the saint(s) of the day, the moon phases, the week number,
the day from the beginning and to the end of the year ....


--
luigi