– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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FTP server of the BIPM Time Department
Circular T
Other products
Links results
Hardware delay characterization
Annual Reports

The complete set of publications and time-data files can be accessed via anonymous ftp at ftp2.bipm.org. Further information is available on the Time Department Database.

The files are organized in the following subdirectories:

  • Circular-T – the latest issues of BIPM Circular T, providing traceability to UTC;

  • Rapid-UTC – the results of Rapid UTC;

  • TT(BIPM) – the realization of Terrestrial Time, TT(BIPM);

  • Data – all data used for the computation of TAI;

  • Other-products – other products, including time differences, clock weights, and frequency drifts;

Other international metrology data centres:

International metrology publications
SI Brochure
Guides in metrology
Circular T
Recommended values of standard frequencies
Related articles
International reference timescales
Recent publications of the BIPM Time Department