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mjd 

        # Date.mjd

(from ruby core)
---
    d.mjd  ->  integer

---

Returns the modified Julian day number.  This is a whole number, which
is adjusted by the offset as the local time.

    DateTime.new(2001,2,3,4,5,6,'+7').mjd     #=> 51943
    DateTime.new(2001,2,3,4,5,6,'-7').mjd     #=> 51943

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