Build copyright years

copyright_years.rb

module CopyrightYears
  def copyright_years(now = nil)
    now ||= Time.now
    years = (2012 .. now.year).to_a
    case years.length
    when 1 then years[0]
    when 2 then years.join(', ')
    else
      "#{years.first}-#{years.last}"
    end
  end
end