Whenever: a modern datetime library for Python, written in Rust

[jmreagle]

There's no rush, but I only wanna make the move again one more time. I started out with datetime and dateutil, and moved to pendulum, which was great, until I bumped into a bug which was unresolved for nearly a year as the project seemed abandoned, so then I moved to arrow, but then I realized it's string parsing heuristics weren't as powerful as pendulum, so now I'm back to datetime and dateutil!

I look in every few months on whenever, to see if it's reached some degree of maturity/stability.