Comment by wood_spirit

Admittedly in a different league speed wise but also scope wise is my very fast timestamp library for Java https://github.com/williame/TimeMillis

This focuses on string <-> timestamp and a few other utilities that are super common in data processing and where the native Java date functions are infamously slow.

I wrote it for some hot paths in some pipelines but was super pleased my employer let me share it. Hope it helps others.