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Physical Measurement Laboratory / Time and Frequency Division

Time Realization and Distribution Group

UTC-UTC (NIST) correlation

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UTC - UTC (NIST)

The deviation of UTC(NIST) from UTC has been less than +/-100 ns since July 6, 1994. The table below shows values of UTC - UTC(NIST) as supplied by the BIPM Circular T for the most recent period in which data are available.

UTC - UTC(NIST)Values (at 10-day intervals)

DateMJDUTC-UTC(NIST) ns
Jul. 23, 202560879-0.3
Jul. 13, 2025608690.3
Jul. 3, 202560859-0.2
Jun. 23, 202560849-1.1
Jun. 13, 202560839-1.5 
Jun. 3, 202560829-0.9
May 24, 202560819-0.0
May 14, 2025608090.7
May 4, 202560799-0.1
Apr. 24, 202560789-0.6
Apr. 14, 202560779-0.6
Apr. 4, 202560769-0.5
Mar. 25, 202560759-0.1
Mar. 15, 202560749-0.0
Mar. 5, 202560739-0.3
Feb. 23, 2025607290.2
Feb. 13, 2025607190.4
Feb. 3, 2025607090.6
Jan. 24, 2025606990.8
Jan. 14, 2025606890.6
Jan. 4, 2025606790.6
Time and frequency
Created September 18, 2009, Updated September 8, 2025
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