As a former developer of software for an international shipping company: Yup. They happen a lot more frequently than most people realise, I expect. Political re

As a former developer of software for an international shipping company: Yup. They happen a lot more frequently than most people realise, I expect. Political reasons (e.g. neighbouring states [as in Sovereign] deciding to unify timezones), coups/wars suspending DST, and so on all usually result in some kind of adjustment, even if it's just the name of the timezone changing.