This method is deprecated or moved on the latest stable version. The last existing version (v1_8_7_330) is shown here.
gregorian?(jd, sg)
Does a given Julian Day Number fall inside the new-style (Gregorian) calendar?
The reverse of self.os? See the documentation for that method for more details.
# File lib/date.rb, line 358 def self.gregorian? (jd, sg) !julian?(jd, sg) end