Day [3]
Day [3] : A civil unit of time, the period during which all times have officially the same date (See above). Like day [2], this unit is generally equal to exactly 24 hours, or 1440 minutes, or 86 400 seconds, with a rare extension by addition of a leap second. However, changes in time reckoning also affect the length of the civil day. A day on which "summer" or "daylight" time is adopted has only 23 hours, and a day on which the reckoning reverts to "winter" or "standard" time has 25 hours. Similar adjustments may occur if a locality switches from one time zone to a different zone
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