*

 

NIST Time Scale Data and Bulletin Archive

Updated monthly 

---

• Notes on NIST Time Scale, Primary Standards and Services
• Leap Second and UT1 - UTC Information
• UTC-UTC (NIST) correlation
• UTC (USNO) - UTC (NIST) correlation

---

NIST no longer sends the Time and Frequency Bulletin by mail. However, the bulletin is produced monthly as a PDF document that can be downloaded using the Adobe Acrobat Reader. To download a bulletin, please click here. The bulletins are available back to January 1997.

 

The NIST Time Scale Data is updated monthly. Direct questions to Petrina Potts: ppotts@nist.gov