I fully agree that time zones are an essential part of determining not just the relative local time of day, but what day it is. A million things, as you say, bu

I fully agree that time zones are an essential part of determining not just the relative local time of day, but what day it is. A million things, as you say, but that's the killer one for me. If you switched to UTC only, then if it is Monday one meter west of the prime meridian, is it really Tuesday two meters to the East? And what time does Tuesday start in Los Angeles - 4pm? Crikey. A day is based on the period of the Earth's rotation, and for most life forms it's linked to the time the Earth faces the Sun. Time zones are a granular way of knowing what time it is in other longitudes consistently. Changing the granularity from 20-odd to one, or a thousand, makes it much worse, not better. The idea that removing time zones "solves more problems than it causes" - I don't buy it either.