class Foo
  def Bar(str)
     year = str[0..1].to_i + 2000
     month = str[2].ord - 48
     day = str[3].ord - 48
     hour = str[4].ord - 48
     min = str[5].ord - 48
     sec = str[6].ord - 48

     # ...
  end
end

class Foo
  def Bar
    ADJ = 48
    month = str[2].ord - ADJ
    day = str[3].ord - ADJ
    hour = str[4].ord - ADJ
    min = str[5].ord - ADJ
    sec = str[6].ord - ADJ
    # ...
  end
end

adj = 48

module Foo
    XYZ = ...

    def bar
         ...
    end
end