BIPM Time Department Data Base
  • Calibrations status

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 guideline

    - Atomic clocks :

  • Get clock code here
  • Clock file format

  • - 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)
  • LZ file format
  • PPP and HD file format
  • TWSTFT file format (ITU-R)
  • CGGTTS and TWSTFT Header examples

  • - Other :

  • Meteorological data file format (Oct.2018)


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