JD and MJD

Julian Date (JD) and Modified Julian Date (MJD)

Julian Day Number is a count of days elapsed since Greenwich mean noon on 1 January 4713 B.C.  The Julian Date is the Julian day number followed by the fraction of the day elapsed since the preceding noon.   Modified Julian Date (MJD) is defined as: MJD=JD-2400000.5

Julian Date (JD) and Modified Julian Date (MJD)