When did the current 24-hour day cycle begin?

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Since the base unit of time is now defined as the second (minutes, hours and days, etc are all derived from it). The "current 24-hour day cycle" would have been defined as recently as 1997 when the S.I. definition of the second was last changed..

KillingTime 4772

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When did the current 24-hour day cycle begin?

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