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## date_madness.rb (in my lib folder)

module DateMadness

  def month_name(month_number)
    if month_number
      Date::MONTHNAMES[month_number]
    end
  end

  def month_number(month_name)
    month_name.downcase
    case month_name
    when 'january' : puts 1
    when 'february' : puts 2
    when 'march' : puts 3
    when 'april' : puts 4
    when 'may' : puts 5
    when 'june' : puts 6
    when 'july' : puts 7
    when 'august' : puts 8
    when 'september' : puts 9
    when 'october' : puts 10
    when 'november' : puts 11
    when 'december' : puts 12
    end
  end

end

##  posts_controller.rb

class PostsController < ApplicationController
  load_and_authorize_resource
  include DateMadness

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