“We should all just set our clocks permanently to GMT and be done with it.”
GMT was created after the investigation of why Emelia Earhart went missing. What a cluster-f. She was to communicate by radio every 15 minutes, and morse-code the other 15 minutes IIRC.
Between the island’s radio being out, and ships in the bay of the island at a different time zone (it was custom for the ship to stay on the time zone of their home port!) - even the redundant communication systems failed due to the different time zones. IIRC, some of the time zones were at 15 minute intervals.
I don't know the details but I'm guessing Earhart's problem was not using GMT for all her transmissions. Perhaps that led to the pilots' custom of keeping schedules for long flights on GMT, or ZULU time?