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julian? 

        # Date.julian?

(from ruby core)
---
    d.julian?  ->  bool

---

Returns true if the date is before the day of calendar reform.

    Date.new(1582,10,15).julian?             #=> false
    (Date.new(1582,10,15) - 1).julian?       #=> true

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.