define standard time
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uniform time for places in approximately the same longitude, established in a country or region by law or custom.
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A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both. Historically, time standards were often based on the Earth's rotational period. From the late 18 century to the 19th century it was assumed that the Earth's daily rotational rate was constant.
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