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

Notes:

• 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.