![]() Each leap second uses the timestamp of a second that immediately precedes or follows it. In Unix time, every day contains exactly 86 400 seconds but leap seconds are accounted for. International Atomic Time (TAI), in which every day is precisely 86 400 seconds long, ignores solar time and gradually loses synchronization with the Earth's rotation at a rate of roughly one second per year. UTC includes leap seconds that adjust for the discrepancy between precise time, as measured by atomic clocks, and solar time, relating to the position of the earth in relation to the sun. Unix time differs from both Coordinated Universal Time (UTC) and International Atomic Time (TAI) in its handling of leap seconds. ![]() The second layer encodes that number as a sequence of bits or decimal digits. The first layer encodes a point in time as a scalar real number which represents the number of seconds that have passed since 00:00:00 UTC on Thursday, 1 January 1970. Two layers of encoding make up Unix time. It has come to be widely used in other computer operating systems, file systems, programming languages, and databases. Unix time originated as the system time of Unix operating systems. It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the beginning of the Unix epoch, less adjustments made due to leap seconds. Unix time is a date and time representation widely used in computing. It was celebrated in Copenhagen, Denmark at a party held by the Danish UNIX User Group at 03:46:40 local time. ![]() ![]() Unix time passed 1 000 000 000 seconds on.
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