– 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
Annual Reports

The complete set of publications and time-data files can be accessed via anonymous ftp (ftp or ftp2.bipm.org).

The files are organized in the following subdirectories:

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

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

  • utcr – the results of Rapid UTC;

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

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

  • timelinks – results of link comparisons.

  • scale – time scales data;

  • annual-reports – archive of the BIPM Annual Reports on Time Activities;

Other international metrology data centres:

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