I am wondering if adding this is on the to-do list?
I recall on the beta, this was something that was considered but something for post-launch.
I would really like to see a multiple calendar feature. I use Aeon Timeline to track the timelines of the multiverse I’ve been writing as a hobby. While I have a universal calendar to keep them on track, it would be nice to see them in their unique calendar.
Also for a real life application, I’m sure people who use the app to track historical timelines would appreciate being able to see the timeline in different calendars and compare (such as lunar calendar vs. Gregorian calendar)