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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)
2013-12-26
56652
-1 ns
2013-12-19
56645
-1 ns
2013-12-12
56638
0 ns
2013-12-05
56631
-1 ns
2013-11-28
56627
-1 ns
2013-11-21
56614
0 ns
2013-11-14
56610
+2 ns
2013-11-07
56609
+3 ns
2013-10-31
56596
+4 ns
2013-10-24
56589
+4 ns
2013-10-17
56582
+7 ns
2013-10-10
56575
+8 ns
2013-10-03
56569
+12 ns
2013-09-26
56561
+12 ns
2013-09-19
56554
+13 ns
2013-09-12
56547
+15 ns
2013-09-05
56540
+14 ns
2013-08-29
56533
+16 ns
2013-08-22
56526
+16 ns
2013-08-15
56519
+16 ns
2013-08-08
56512
+18 ns
2013-08-01
56505
+17 ns
2013-07-25
56498
+17 ns
2013-07-18
56491
+18 ns
2013-07-11
56484
+18 ns
2013-07-04
56477
+18 ns
2013-06-27
56470
+16 ns
2013-06-20
56463
+15 ns
2013-06-13
56456
+12 ns
2013-06-06
56449
+10 ns
2013-05-30
56442
+9 ns
2013-05-23
56435
+6 ns
2013-05-16
56428
+3 ns
2013-05-09
56421
-1 ns
2013-05-02
56414
-3 ns
2013-04-25
56407
-4 ns
2013-04-18
56400
-5 ns
2013-04-11
56393
-5 ns
2013-04-04
56386
-9 ns
2013-03-28
56379
-10 ns
2013-03-21
56372
-12 ns
2013-03-14
56365
-14 ns
2013-03-07
56358
-13 ns
2013-02-28
56351
-13 ns
2013-02-21
56344
-15 ns
2013-02-14
56337
-15 ns
2013-02-07
56330
-14 ns
2013-01-31
56323
-12 ns
2013-01-24
56316
-11 ns
2013-01-17
56309
-11 ns
2013-01-10
56302
-8 ns
2013-01-03
56295
-6 ns

*Interpolated Value