BIPM Time Department Data Base

Complete documentation and guidelines to contribute to UTC and UTCr is available in following documents :


Prerequisites :

  • Administrative requirements for contribution to UTC
  • Technical requirements for contribution to UTC
  • Laboratory information spreadsheet
  • Technical recommendation for UTC(k)


  • General technical guidelines


    Time transfer :

  • List of recent GNSS receivers contributing to UTC and their manufacturer

  • Global Navigation Satellite System file format (CGGTTS) : GPS only (CGGTTS Version 1 ), GPS+GLONASS (CGGTTS Version 2), all GNSS (CGGTTS Version 2E)
  • PPP and HD file format
  • TWSTFT file format (ITU-R)
  • CGGTTS and TWSTFT Header examples

  • Atomic clocks :

  • Get clock code here
  • Clock file format


  • If you did not found an answer to your question in this documentation, please contact us