I scanned through this and my takeaway is that it’s just defining a formal grammar for iso 8601. Did I miss anything important?

I had a hard time with this too, I didn’t even know there were supposed to be words. What finally did it was actually squinting, like so much that my eyes are nearly closed and I can just see a little between my eyelashes. Then it stands out clear as day.

I sure hope so. It’s about damn time.