Dates for each country are managed by individual Date Handlers if available, so one would need to be made to support your world calendar. Reading the following page that would be within the realms of a non programmer:
https://www.gramps-project.org/wiki/index.php/Date_Handler
All the rest sound like needing the creation of custom third party views to do what you want , as you don’t program I suggest you would need to potentially hire a programmer to do that!