(12C) Gregorian Date to Julian Day Number and vice versa

[Albert Chan]

(01-14-2019 04:58 PM)Dieter Wrote:  BTW, please let's be precise here and distinguish between Julian dates (JD) and Julian day numbers (JDN).

I was using the abbreviation from https://www.hermetic.ch/cal_stud/jdn.htm, section 6:

"Given a Julian day number JD, the modified Julian day number MJD is defined as MJD = JD - 2,400,000.5"

But, now that you mentioned it ... what is the difference ?