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What hills are you dying on?
(lemmy.ml)
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Check this out. I'm a business with at least one office in every US state. You want to know when my New York office opens so you can come by. Instead of seeing "Offices are open 9 AM to 5 PM" You now need to check every office... by state.. by city? Time zones would be helpful even if we all used GMT, so that you could easily determine which time zone a business is in to set a reasonable time to be open.
DST can fuck off though.
That's a pretty specific use though. A case like this only makes sense because we all somehow decided 9AM - 5PM is a standard business time, when society could benefit from having different business/services open at different times.
That was an example of a situation where time zones make sense. Any time it is important where the sun is in the sky, the time that it occurs will differ depending on where you are in the world. When is lunch break? When do backups run? When can you see the eclipse? If we weren't in an interconnected world, it wouldn't matter much but we need some convention to communicate information that is dependent on where the sun is, as that very often dictates human activity.
It seems like a universal time makes sense but I can't think of a way to get around the fact that activity will vary according to timezones anyway.