A device comprising a reception unit for automatically receiving two radiofrequency signals originating from different satellite-based positioning and date-stamping systems, a data processing unit for automatically processing each of the radiofrequency signals so as to deduce time data therefrom, each time datum comprising at least one number of weeks, a calculation unit for automatically calculating a UTC date which is compatible with these time data, and a data transmission unit for automatically providing this UTC date to at least one user system.