Whoa. This is hella cool. Love the documented spec (https://docs.markwhen.com/syntax/dates-and-ranges.html) and "here's an open spec I'm adding value to with a creature-comforts UI, but not walling you in per-se" approach to funding the thing. Rock on, I'll have to play more with this soon.

UPDATE: There's also a related CLI tool?! Oh HELLS yes. https://github.com/mark-when/mw