– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:

| Site map | News | Contact us
FTP server of the BIPM Time Department
Circular T
Other products
Links results
Hardware delay characterization
Annual Reports

The BIPM Annual Report on Time Activities compiles the information on the data and computational process for Coordinated Universal Time (UTC) over one year.

Since 2009 only electronic versions of the Annual Report have been published (on the internet), giving easy access to individual sections and tables.

Until 1987 the Bureau International de l'Heure (BIH) was responsible for the maintenance of UTC, and published all relevant information in the BIH Annual Report.

    BIPM Annual Report on Time Activities

    Time SignalsView

    Time Dissemination ServicesView

    BIH Annual Report (extract)

For the most recent report, with access to individual sections and tables, please see:


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