Meeus gives both the Julian date and the corresponding datetime which meet my criteria in a worked example the new moon of February  occurred at  or  February   TT p However he refused to use the term Julian date stating that that meant a date in the Julian calendar using instead Julian Ephemeris Days JDE p Instead of Ephemeris Time used from  to  Meeus noted that in  both Barycentric Dynamical Time and Terrestrial Dynamical Time were implemented but because the difference between them does not exceed  seconds he used a generic Dynamical Time TD p TDT was renamed TT in