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NIST Time Scale Data Archive
Updated monthly

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UTC(USNO) - UTC(NIST)

The United States Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) make regular comparisons of their respective time scales. These comparisons are made using GPS common-view measurements from up to approximately 10 GPS satellites. The table below lists recent differences between the two time scales.

Weekly UTC(USNO, Master Clock) - UTC(NIST)Values

Date MJD UTC(USNO)-UTC(NIST)
(+/- 20 ns)
2007-12-27 54461 4 ns
2007-12-20 54454 5 ns
2007-12-13 54447 5 ns
2007-12-06 54440 6 ns
2007-11-29 54433 7 ns
2007-11-22 54426 8 ns
2007-11-15 54419 7 ns
2007-11-08 54412 7 ns
2007-11-01 54405 7 ns
2007-10-25 54398 8 ns
2007-10-18 54391 7 ns
2007-10-11 54384 6 ns
2007-10-04 54377 4 ns
2007-09-27 54370 2 ns
2007-09-20 54363 0 ns
2007-09-13 54356 -1 ns
2007-09-06 54349 -3 ns
2007-08-30 54342 -4 ns
2007-08-23 54335 -4 ns
2007-08-16 54328 -4 ns
2007-08-09 54321 -2 ns
2007-08-02 54314 -4 ns
2007-07-26 54307 -3 ns
2007-07-19 54300 -3 ns
2007-07-12 54293 -2 ns
2007-07-05 54286 -1 ns
2007-06-28 54279 1 ns
2007-06-21 54272 3 ns
2007-06-14 54265 4 ns
2007-06-07 54258 4 ns
2007-05-31 54251 6 ns
2007-05-24 54244 9 ns
2007-05-17 54237 11 ns
2007-05-10 54230 12 ns
2007-05-03 54223 15 ns
2007-04-26 54216 15 ns
2007-04-19 54209 16 ns
2007-04-12 54202 15 ns
2007-04-05 54195 16 ns
2007-03-29 54188 19 ns
2007-03-22 54181 20 ns
2007-03-15 54174 21 ns
2007-03-08 54167 21 ns
2007-03-01 54160 21 ns
2007-02-22 54153 23 ns
2007-02-15 54146 23 ns
2007-02-08 54139 23 ns
2007-02-01 54132 25 ns
2007-01-25 54125 26 ns
2007-01-18 54118 28 ns
2007-01-11 54111 28 ns
2007-01-04 54104 26 ns

Online: September 2002 - Last update: January 2, 2008 - ep

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