This week I made my own calendar standard. Each year is a single page markdown text file. ff to fork and do whatever you want with it
https://github.com/jgarofoli/calendar
GitHubGitHub - jgarofoli/calendar: Plain-text yearly calendars in Markdown: spec, generator, linter, and web editor.Plain-text yearly calendars in Markdown: spec, generator, linter, and web editor. - jgarofoli/calendar
commit 2380b84