class ActionView::Helpers::DateTimeSelector

def select_month
  if @options[:use_hidden] || @options[:discard_month]
    build_hidden(:month, month || 1)
  else
    month_options = []
    1.upto(12) do |month_number|
      options = { value: month_number }
      options[:selected] = "selected" if month == month_number
      month_options << content_tag("option", month_name(month_number), options) + "\n"
    end
    build_select(:month, month_options.join)
  end
end