Wouldn’t it just make sense to define a given hour as UTC 00:00 and then reference that ONE time when communicating? As it stands, were just giving every single time zone two or three different names for seemingly no merit
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There is only one UTC. However, since the time of day is relative to your specific location, you have to have a way to identify local time – which is why the Universal time is used with an indication of how many hours offset the local time is.
The older identifiers of letter codes are not specific enough without knowledge of where the time zone is located, so the + and – system is used.
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