Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).

View the beta site
NIST logo

*
Bookmark and Share

  


NIST Time Scale Data Archive

Updated monthly


Return to Archive index 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2014 2015 Current Year   

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