I don't think this is a good idea. People on average take a long time to develop the intuition about numbers and units. Just look how the US resists to change t

I don't think this is a good idea. People on average take a long time to develop the intuition about numbers and units. Just look how the US resists to change to metric units. Just using UTC would require everyone require a new intuition about times, and what is even worse, a different one in each location. Time zones are bad enough, but they keep the rough approximation that 12:00 is about the middle of the day. And in some regions, people just tend to be a bit "late" to compensate for their timezone weirdness. Also, it would make any kind of writing about times basically impossible. Whenever you write a sentence like: "they met at 18:30" most people would understand that this means the early evening. But when you read: "they went for a swim at 20:00 UTC" you don't know what that means, until you know where they meet. And happen to know the timezone offset. Or have to google it. Every time you read a sentence like that.