See the " Current number of leap seconds" section for the number of leap seconds inserted to date. Leap seconds are inserted as necessary to keep UTC within 0.9 seconds of the UT1 variant of universal time. The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by Earth's rotation. A decision whether to remove them altogether has been deferred until 2023. The use of UTC is recommended when a date and times portability across computers is. Thus, UTC provides a time-zone free or time-zone neutral time. The worlds time zones are expressed as positive or negative offsets from UTC. Coordinated Universal Time (UTC) is a high-precision, atomic time standard. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second (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." Ī number of proposals have been made to replace UTC with a new system that would eliminate leap seconds. Converting to Coordinated Universal Time. Local time is based on time zone and Coordinated Universal Time (UTC). India Standard Time Wednesday Sep, 28, 2022 08:44 PM 12 1 2 3 4 5 6 7 8 9 10 11 India Standard Time (IST) IST is 5 hours 30 minutes ahead of Universal Time. This change also adopted leap seconds to simplify future adjustments. Coordinated Universal Time (UTC) UTC is the time same as Universal Time. Time Zone List Etc/GMT+11, (GMT-11:00) Coordinated Universal Time-11 Pacific/Samoa, (GMT-11:00) Samoa Pacific/Honolulu, (GMT-10:00) Hawaii Pacific/Marquesas. 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. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The coordination of time and frequency transmissions around the world began on 1 January 1960.
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