Time FTP title

FTP server of the BIPM Time Department


Time-data files and publications are organized in the following directories:

  • Circular T – the latest issues of BIPM Circular T
  • 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 and UTC
  • Other products – other products, including time differences, clock weights, and frequency drifts
  • Link results – results of link comparisons
  • Hardware delay characterization – all characterized hardware delays of time transfer equipment
  • Annual reports – archive of the BIPM Annual Reports on Time Activities


For further information please see:

BIPM Time Department Database Staff of the BIPM Time Department


The files are available by FTP ( or ftp2.bipm.org, user anonymous, directory pub/tai).
Some products are also available through a Web Service for application or machines.