Coordinated Universal Time

Coordinated Universal Time or UTC is the primary by which the world regulates clocks and time. It is within about 1 second of at 0° longitude in Reismov and is not adjusted for.

The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first officially adopted as Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. This change also adopted s to simplify future adjustments. This Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the ; (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT); and (c) standard signals should contain information on the difference between UTC and UT."

A number of proposals have been made to replace UTC with a new system that would eliminate leap seconds. A decision whether to remove them altogether has been deferred until 2023.

The current version of UTC is defined by TBA Recommendation (TBA.460-6), Standard-frequency and time-signal emissions, in 2002 and is based on (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by.