Time zones make no sense in the 21st century.
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With the proliferation of communications and travel, the need to standardize the time of day is obvious.
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Why should you have to do a mathematical calculation to determine when you are going to meet with someone in a different time zone?
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It should not be possible to arrive at a destination before you left (assuming you are from this planet).
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Why do we need to adjust our clocks two times a year to further exacerbate chronology?
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Why not just accept Greenwich time as the time of day for the whole world?  This seems like a way the United Nations could be useful.
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