This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job. You're in the dumb-mistakes-and-gotchas category.
Last Updated: 2024-11-21
Timezones like CET and CEST are deprecated in the official literature (e.g. ICANN), as are many other abbreviations used in popular contempary libraries or programming languages.
Instead choose a zone that observes CET, like Europe/Berlin.
Use location for timezones instead of initials