A big reframing in my life was when I realized that timezones aren't a physical or mathematical construct: they're a legal construct. This was driven home when

A big reframing in my life was when I realized that timezones aren't a physical or mathematical construct: they're a legal construct. This was driven home when Russia changed one of its timezones and we got bit by it because it turned out we had cached a build of tzdata years ago instead of building it from scratch every time we pushed out a new version (oops). The law went into effect and Russian users immediately started filing bugs.