Committee members

Consultative Committee for Time and Frequency (CCTF)

President

Dr N. Dimarcq

CIPM Member

Executive Secretary

Dr P. Tavella

BIPM

List of meetings

Meetings and related documents

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

24th meeting of the CCTF (Session I - online)

14, 15, 21, 22 November
2024

23rd meeting of the CCTF (online)

From 29 June
to 01 July
2022

22nd meeting of the CCTF (Session II - online)

From 11 to 12
March
2021

22nd meeting of the CCTF (Session I - online)

From 28 to 29
October
2020

21st meeting of the CCTF

From 08 to 09
June
2017

Online information meeting 2023 - BUTTON

CCTF Online Information meeting - 2023

Asset Publisher

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

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.