How can I make a clean calendar, a do-list that allows me to choose a date, day of the week and time?

[TIMAI2]

I have always like this calendar approach by @Kevinkun.

How can i create a calendar? assigning color to calendar cells. how can i do it

here is a calendar with no extension: calendar.aia (9.1 KB) [Snipaste_2023-05-10_18-45-56]

Just select a date in the calendar, and show the events you have associated with that date.