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Because it does not handle leap seconds, it is neither a linear representation of time nor a true representation of UTC.
and the second encodes that number as a sequence of bits or decimal digits.
As is standard with UTC, this article labels days using the Gregorian calendar, and counts times within each day in hours, minutes, and seconds.
Some of the examples also show International Atomic Time (TAI), another time scheme, which uses the same seconds and is displayed in the same format as UTC, but in which every day is exactly 86400 seconds long, gradually losing synchronization with the Earth's rotation at a rate of roughly one second per year.
Unix time is a single signed integer number which increments every second, without requiring the calculations to determine year, month, day of month, hour and minute required for intelligibility to humans.
Modern Unix time is based on UTC, which counts time using SI seconds, and breaks up the span of time into days almost always 86400 seconds long, but due to leap seconds occasionally 86401 seconds.This extra second keeps the days synchronized with the rotation of the Earth, per Universal Time. There is a problem with this definition, in that UTC did not exist in its current form until 1972; this issue is discussed below.For brevity, the remainder of this section uses ISO 8601 date format, in which the Unix epoch is 1970-01-01TZ.The Unix time number is zero at the Unix epoch, and increases by exactly 86400 per day since the epoch.Thus 2004-09-16TZ, 12677 days after the epoch, is represented by the Unix time number 12677 × 86400 = 1095292800.This can be extended backwards from the epoch too, using negative numbers; thus 1957-10-04TZ, 4472 days before the epoch, is represented by the Unix time number −4472 × 86400 = −386380800.