INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. 33 (0) 1 40 51 22 29 FAX 33 (0) 1 40 51 22 91 Internet: services.iers@obspm.fr Paris, 21 November 2014 Bulletin D 121 ANNOUNCEMENT OF DUT1 From the 25 December 2014, 0h UTC until further notice, the value of DUT1 to be disseminated with the time signals will be DUT1 = -0.5 s Bulletin D 122 should be issued in February 2015