[daurnimator]

This is actually what prompted me to start work on luatz: https://github.com/daurnimator/luatz

Trying to implement RRULEs you need all sorts of fun date math + converting back and forth between time zones.

I never released my ical library (didn't get it open sourced from work); but luatz lets you write your own :)

[grinich]

that's pretty awesome :) too bad about the ics library! the world needs more tools like this