class Chronic::MiniDate

def equals?(other)
  @month == other.month and day == other.day
end

def initialize(month, day)
  unless (1..12).include?(month)
    raise(InvalidArgumentException, "1..12 are valid months")
  end
  @month = month
  @day = day
end

def is_between?(md_start, md_end)
  return false if (@month == md_start.month && @month == md_end.month &&
                  (@day < md_start.day || @day > md_end.day))
  return true if (@month == md_start.month and @day >= md_start.day) ||
                 (@month == md_end.month and @day <= md_end.day)
  i = (md_start.month % 12) + 1
  until i == md_end.month
    return true if @month == i
    i = (i % 12) + 1
  end
  return false
end