Your example alludes to why there will always be a rift between UTC and local representations. Unless your system can understand "one hour after I end work for

Your example alludes to why there will always be a rift between UTC and local representations. Unless your system can understand "one hour after I end work for the day" correctly, any representation of that time will be subject to not just local timezones changes, but local work conditions for one or a few people (otherwise it can't be assumed a single time instance). One is a a representation stripped of most ornamentation to be universally agreed upon, the other is a representation with many additional layers of context so it's locally understood. There will likely always be a trade off between these, as a universal time is useful in all cases for only a small group of people, while a local time quickly loses relevance out of a local context.