Question

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Answer 1

Answer:

Time zones, UTC vs GMT and time difference

Time zones are geographical areas that observe the same official time

An offset is the difference between time in a certain time zone and Universal Coordinated Time (UTC), whose predecessor is GMT

GMT is itself a time zone that has 0 offset from UTC. Even after 1972, when UTC replaced GMT, the latter continued to be widely used in various fields (e.g. aviation and broadcasting)

For direct practical purposes, UTC and GMT appear a lot as UTC/GMT, and they are, in clock time, interchangeable