The 31st European Frequency and Time Forum and the 71st consecutive meeting of the IEEE International Frequency Control Symposium will be held as a joint conference in Besançon, France, July 9th-13th 2017. The conference will provide information on recent advances and trends on scientific research, development and manufacturing technology in the area of frequency and time and frequency control. A technical exhibition will be held during the conference, which will be hosted in Micropolis Conference centre, easily reached by ground transportation from downtown Besançon.