![]() No Daylight Saving Time in UTCĭaylight Saving Time (DST) is not used for UTC as it is a time standard for all time zones. These time scales are denoted in the form UTC (NPL) in the UTC form, where NPL here identifies the National Physical Laboratory, UK. However, many time zone boundaries are distorted by geographical and political factors. Time codes are usually published in the form of UTC, which differs from TAI by a well-known integer number of seconds. ![]() In theory, the UTC offsets countries use should reflect the local mean solar time. Two time components are added together to translate mean solar time to Coordinated Universal Time (UTC): International Atomic Time (TAI) measured by atomic clocks and Universal Time (UT1), the actual length of a day on Earth. For every 15 degrees of longitude east or west, mean solar time changes by 1 hour. Primarily, UTC is based on mean solar time at the prime meridian running through Greenwich, UK. The offset is expressed as either UTC- or UTC+ and the number of hours and minutes. All time zones are defined by their offset from UTC. The clocks are continuously measured to determine their relative stability, and the measurement data is input to a time scale algorithm, called AT1. UTC-Coordinated Universal Time-is the 24-hour time standard used as a basis for civil time today. UTC(NIST) works by continuously operating its ensemble of atomic clocks under carefully controlled environmental conditions. The graph above shows that there is no clock change in UTC during 2023. ![]()
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