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NIST Time Scale Data and Bulletin Archive

Updated monthly 

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: