Very interesting! Logseq has a very nifty feature called “date picker”. When you type a slash-command and want to insert a date, a small calendar pops up, and you can use the keyboard to quickly pick a date, which gets inserted.
It’s shown in this video.
When inserting a “scheduled date” or “deadline date” for tasks, when referring to a journal and such, this is indispensible.
I wonder if what’s being discussed in this thread could be used for this purpose. The calendar widget would have to allow a selection and return it.