Well, first of all, there is https://www.stefanjudis.com/today-i-learned/set-the-default-time-zone-in-node-js/.
The motivation here for me is to set timezone for Node.js (in a container).
This is a Containerfile that I came up with to show few different way to set TZ
env var
which is a sufficient way to setup timezone for a Node.js process.
FROM registry.access.redhat.com/ubi9/nodejs-22-minimal