CCTF

Committee members

Consultative Committee for Time and Frequency (CCTF)

President

Dr N. Dimarcq

CNRS Senior Scientist at ARTEMIS

CNRS, Université Côte d'Azur, Observatoire Côte d'Azur

France

Executive Secretary

Dr P. Tavella

Bureau international des poids et mesures

France

ALL MEMBERS

List of meetings

Meetings and related documents

Upcoming Meeting

24th meeting of the CCTF (Session II - BIPM Headquarters (Sèvres)) and CCTF Working Groups meetings from 8 to 17 September 2025
  • From 18 to 19
  • September
  • 2025

Upcoming Meeting

24th meeting of the CCTF (Session I - online)
  • 14, 15, 21, 22 November
  • 2024

Past Meeting

23rd meeting of the CCTF (online)
  • From 29 June
  • to 01 July
  • 2022

Past Meeting

22nd meeting of the CCTF (Session II - online)
  • From 11 to 12
  • March
  • 2021

Past Meeting

22nd meeting of the CCTF (Session I - online)
  • From 28 to 29
  • October
  • 2020

Past Meeting

21st meeting of the CCTF
  • From 08 to 09
  • June
  • 2017
All meetings

Online information meeting 2023 - BUTTON

Asset Publisher

Working Groups

CCL-CCTF-WGFS

CCL-CCTF Working Group on Frequency Standards

CCTF-WG-ALGO

CCTF Working Group on Time Scale Algorithms

CCTF-WGATFT

CCTF Working Group on Coordination of the Development of Advanced Time and Frequency Transfer Techniques

CCTF-WGGNSS

CCTF Working Group on GNSS Time Transfer

CCTF-WGMRA

CCTF Working Group on the CIPM MRA

CCTF-WGPSFS

CCTF Working Group on Primary and Secondary Frequency Standards

CCTF-WGSP

CCTF Working Group on Strategic Planning

CCTF-WGTAI

CCTF Working Group on TAI

CCTF-WGTWSTFT

CCTF Working Group on Two-Way Satellite Time and Frequency Transfer

Publications

Publications

Meeting reports

[CCTF] 21st meeting (2017)

Guidance documents on the CIPM MRA

[CCTF] CCTF Guidelines for Planning, Organizing, Conducting and Reporting Key, Supplementary and Pilot Comparisons

[CCTF] CCTF-WGMRA Guideline 6: Requirements for participation in the computation of UTC at the BIPM (2017)

[CCTF] CCTF-WGMRA Guideline 8: Technical requirements for participation in UTC (2017)

All publications

CCTF-mission

Mission

The Consultative Committee for the Definition of the Second (CCDS) was set up in 1956. Its name was changed to Consultative Committee for Time and Frequency (CCTF) by the CIPM in 1997.

Present activities concern matters related to the definition and realization of the second, establishment and diffusion of International Atomic Time (TAI) and Coordinated Universal Time (UTC), and advice to the CIPM on matters related to time and time scales.

Nested Applications

News

Keep up to date with plans for the redefinition of the second

The CCTF has prepared a webpage that will be updated regularly with information on the redefinition.

CCTF capacity building project to improve the quality of UTC(k) and UTC time scales is taking shape

The joint project between the CCTF and the UFFC is aimed at improving the capabilities of UTC laboratories, NMIs and the broader TF community.

BIPM Circular T: updated format and new information

The changes will be introduced from Circular T number 437 in June 2024.

WMD 2024 Launch Event hosted at UNESCO headquarters

First celebration of World Metrology Day following the formal proclamation by UNESCO.

BIPM workshop on Quantum Technologies

Key insights and a white paper will be published later this year.

Asset Publisher

Reports and announcements

Young Metrologists' 2050+ Vision

Report of Session II of the 113th meeting of the CIPM (2024)

Annual Review Supplement - Activities of the BIPM Departments 2023

BIPM Annual Review 2023/2024

Report of Session I of the 113th meeting of the CIPM (2024)

Proceedings of the 27th meeting of the CGPM (2022)

Report of the 112th meeting of the CIPM (2023)

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