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jd 

        # Date.jd

(from ruby core)
---
    Date.jd([jd=0[, start=Date::ITALY]])  ->  date

---

Creates a date object denoting the given chronological Julian day
number.

    Date.jd(2451944)          #=> #<Date: 2001-02-03 ...>
    Date.jd(2451945)          #=> #<Date: 2001-02-04 ...>
    Date.jd(0)                #=> #<Date: -4712-01-01 ...>

See also ::new.


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

---

Returns the 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').jd      #=> 2451944
    DateTime.new(2001,2,3,4,5,6,'-7').jd      #=> 2451944

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