I used third_base in production after creating it, but it never saw widespread use.
It had some significant compatibility issues, and it wasn't fast enough to justify them for most people.
Anyway, since creating third_base in 2008, I gained more experience programming in C.
In July of this year, I was itching to write a nontrivial ruby C extension, and decided to give a shot at writing an API compatible replacement for ruby's date class in C.