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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 here using the Adobe Acrobat Reader.   To display a bulletin, simply select and click the bulletin date from the menu.   The bulletins are available back to January 1997.

    Month Year
     

    The NIST Time Scale Data is updated monthly. Direct questions to Eyvon Petty: pettye@boulder.nist.gov

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