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<=> 

        # Date.<=>

(from ruby core)
---
    d <=> other  -> -1, 0, +1 or nil

---

Compares the two dates and returns -1, zero, 1 or nil.  The other should
be a date object or a numeric value as an astronomical Julian day
number.

    Date.new(2001,2,3) <=> Date.new(2001,2,4)   #=> -1
    Date.new(2001,2,3) <=> Date.new(2001,2,3)   #=> 0
    Date.new(2001,2,3) <=> Date.new(2001,2,2)   #=> 1
    Date.new(2001,2,3) <=> Object.new           #=> nil
    Date.new(2001,2,3) <=> Rational(4903887,2)  #=> 0

See also Comparable.

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