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NIST UTC 2021 Archive
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)
| Date | MJD | UTC-UTC(NIST) ns |
|---|---|---|
| 2021-12-31 | 59579 | 0.7 |
| 2021-12-21 | 59569 | 0.2 |
| 2021-12-11 | 59559 | 0.0 |
| 2021-12-01 | 59549 | 0.6 |
| 2021-11-21 | 59539 | 0 |
| 2021-11-11 | 59529 | -0.8 |
| 2021-11-01 | 59519 | -0.4 |
| 2021-10-22 | 59509 | 0.5 |
| 2021-10-12 | 59499 | 0.6 |
| 2021-10-02 | 59489 | -1.4 |
| 2021-09-22 | 59479 | -2.1 |
| 2021-09-12 | 59469 | -1.2 |
| 2021-09-02 | 59459 | -0.1 |
| 2021-08-23 | 59449 | 0.6 |
| 2021-08-13 | 59439 | 0.1 |
| 2021-08-03 | 59429 | -0.8 |
| 2021-07-24 | 59419 | -2 |
| 2021-07-14 | 59409 | -1.7 |
| 2021-07-04 | 59399 | -0.6 |
| 2021-06-24 | 59389 | -0.5 |
| 2021-06-14 | 59379 | -0.8 |
| 2021-06-04 | 59369 | -1.5 |
| 2021-05-25 | 59359 | -0.6 |
| 2021-05-15 | 59349 | 1.7 |
| 2021-05-05 | 59339 | 2.2 |
| 2021-04-25 | 59329 | 1.1 |
| 2021-04-15 | 59319 | 0.2 |
| 2021-04-05 | 59309 | 0.7 |
| 2021-03-26 | 59299 | 0 |
| 2021-03-16 | 59289 | -1.1 |
| 2021-03-06 | 59279 | -1 |
| 2021-02-24 | 59269 | -0.5 |
| 2021-02-14 | 59259 | -0.4 |
| 2021-02-04 | 59249 | 0.6 |
| 2021-01-25 | 59239 | -0.5 |
| 2021-01-15 | 59229 | -1 |
| 2021-01-05 | 59219 | -1 |
Created February 23, 2022, Updated January 2, 2026