All systems in common use, use UTC for the underlying representation. The concept of setting the time zone is a high level library thing already and all these

All systems in common use, use UTC for the underlying representation. The concept of setting the time zone is a high level library thing already and all these systems, their standard time functions simply provide a time since some fixed epoch. Ie see C time(), gettimeofday, clock_gettime, GetSystemTime. They’re all “UTC” based. If a piece of server software is going out of its way to deal with local time APIs and blows up because of it - well it either legitimately needs to deal in local time, or it’s so poorly designed that simply keeping the system locale set to UTC isn’t somehow a magic fix. That’s just an adhoc assumption.