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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)
2004-12-30 53369 10 ns
2004-12-23 53362 13 ns
2004-12-16 53355 13 ns
2004-12-09 53348 14 ns
2004-12-02 53341 16 ns
2004-11-25 53334 14 ns
2004-11-18 53327 13 ns
2004-11-11 53320 11 ns
2004-11-04 53313 10 ns
2004-10-28 53306 10 ns
2004-10-21 53299 11 ns
2004-10-14 53292 12 ns
2004-10-07 53285 11 ns
2004-09-30 53278 11 ns
2004-09-23 53271 11 ns
2004-09-16 53264 13 ns
2004-09-09 53257 11 ns
2004-09-02 53250 7 ns
2004-08-26 53243 6 ns
2004-08-19 53236 4 ns
2004-08-12 53229 3 ns
2004-08-05 53222 -1 ns
2004-07-29 53215 0 ns
2004-07-22 53208 -3 ns
2004-07-15 53201 -2 ns
2004-07-08 53194 -1 ns
2004-07-01 53187 -1 ns
2004-06-24 53180 -1 ns
2004-06-17 53173 0 ns
2004-06-10 53166 3 ns
2004-06-03 53159 7 ns
2004-05-27 53152 9 ns
2004-05-20 53145 13 ns
2004-05-13 53138 17 ns
2004-05-06 53131 17 ns
2004-04-29 53124 18 ns
2004-04-22 53117 17 ns
2004-04-15 53110 14 ns
2004-04-08 53103 10 ns
2004-04-01 53096 4 ns
2004-03-25 53089 1 ns
2004-03-18 53082 -1 ns
2004-03-11 53075 -2 ns
2004-03-04 53068 -6 ns
2004-02-26 53061 -12 ns
2004-02-19 53054 -15 ns
2004-02-12 53047 -11 ns
2004-02-05 53040 -17 ns
2004-01-29 53033 -21 ns
2004-01-22 53026 -22 ns
2004-01-15 53019 -24 ns
2004-01-08 53012 -21 ns
2004-01-01 53005 -19 ns

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