So, there I was, diving into Deno's new feature, Deno.cron, when something caught my eye. It was missing a few things – support for time zones, second granularity, and some extended cron-syntax I like. It got me thinking: could I fill these gaps? Despite not having dabbled in Rust before, I had a fair bit of fun creating the croner library for JavaScript and TypeScript, so why not give it a shot in Rust?

A while ago, I wrote a post called How to Create a Dual-Mode Cross-Runtime JavaScript Package: How to Create a Dual-Mode Cross-Runtime JavaScript Package, and while possible - it sure isn't simple. There has to be a better way, and the creators behind jsr.io seem to agree.