Get the named 'season' for a Time / Date / DateTime in ruby

date_time_season.rb

module DateTimeUtils
  def season
    case self.month
      when 3, 4, 5
        'Spring'
      when 6, 7, 8
        'Summer'
      when 9, 10, 11
        'Fall'
      when 12, 1, 2
        'Winter'
    end
  end
end

class Time
  include DateTimeUtils
end
class Date
  include DateTimeUtils
end
class DateTime
  include DateTimeUtils
end