![]() ![]() This correction keeps UTC in conjunction with the apparent position of the Sun and the stars, and it is the standard used for all general timekeeping applications. TAI is computed by the International Bureau of Weights and Measures (BIPM) located near Paris, France.Ĭoordinated Universal Time (UTC) is based on TAI, but it is adjusted by leap seconds to account for the difference between the definition of the second and the rotation of Earth. While the stability of TAI is achieved by this weighted average, the accuracy of TAI is derived from data from primary frequency standards, which are clocks built at several national metrology institutes. Thus, if N = 300, the maximum weight is 0.83 %. The most stable clocks receive the most weight in the calculation, but the maximum weight assigned to any clock is limited to A / N, where A = 2.5 and N is the number of clocks. These clocks are located at more than 60 timing laboratories around the world. International Atomic Time (TAI) is an international time scale that is computed by taking the weighted average of more than 300 atomic clocks. What are International Atomic Time (TAI) and Coordinated Universal Time (UTC)? It is distributed through the NIST time and frequency services and continuously compared to the time and frequency standards located around the world. UTC(NIST) serves as a national standard for frequency, time interval, and time-of-day. The clocks in the UTC(NIST) time scale also contribute to the International Atomic Time (TAI) and Coordinated Universal Time (UTC). The most stable clocks are assigned the most weight. The outputs of the clocks are combined into a single signal by using a weighted average. The number of clocks in the time scale varies, but is typically around ten. The UTC(NIST) time scale comprises an ensemble of cesium beam and hydrogen maser atomic clocks, which are regularly calibrated by the NIST primary frequency standard. UTC(NIST) is the coordinated universal time scale maintained at NIST. Why is UTC used as the acronym for Coordinated Universal Time instead of CUT?.What are International Atomic Time (TAI) and Coordinated Universal Time (UTC)?.How is UTC(NIST) related to Coordinated Universal Time (UTC) International Atomic Time (TAI), Greenwich Mean Time (GMT), USNO time, GPS time and Zulu time? Two-Way Satellite Time and Frequency Transfer (TWSTFT).Send any comments or questions to: refer to our for our web clock/map and our Time and Frequency Division FAQ with questions about time zones, daylight saving time, atomic clocks, etc. We do not have a widget/gadget application for your desktop. This is a web page with just the widget: ![]() The widget can no longer be embedded into other web pages. The time shown estimates that one-half of the round-trip delay is the delay from the time server to the browser. When the time is displayed in the browser. The widget utilizes the client's computer clock as a timer to measure the round-trip network delay, which is the interval of time starting when the widget sends a time request to the server and ending ![]() It should not be used to make measurements, nor should it be used to establish traceability to NIST. Therefore, this widget is intended as a time-of-day service only. So the running clock comes from the internal oscillator of the local computer. The widget is not continuously linked to NIST, it re-synchronizes with NIST every 10 minutes. The widget adjusts the display to show the local time based on the client's computer time zone settings as the default. The time reference for the widget is the output of the national time scale called UTC(NIST), which disseminates Coordinated Universal Time UTC(NIST). It is a web clock showing the official time of day from NIST, displayed as a 12 or 24-hour clock, in a user-selectable time zone. This widget is a public service provided by the Time and Frequency Division of the National Institute of Standards and Technology (NIST). ![]()
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