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Re:Map of Proposed US Time Zone Changes by mimixco on Monday May 06, 2019 @11:34PM (#19846273)
A link above explains. You want to call your uncle in Australia. Is he awake? (home from work?, etc). You can't tell because it's the same "time" here and there but a very different part of his day.
Re:Map of Proposed US Time Zone Changes by ovao on Tuesday May 07, 2019 @01:05AM (#19846759)
To deduce whether your Australian uncle is likely at work, as an example, you need to know A) his work schedule and B) the difference in time between his and your locations.

If you’re both in the time zone, you need to know A) his work schedule. The idea that a person’s workday might be 1 AM - 9 AM might be difficult to comprehend, but only relative to our current understanding.