class ActionView::Helpers::DateTimeSelector

def separator(type)
  return "" if @options[:use_hidden]
  case type
    when :year, :month, :day
      @options[:"discard_#{type}"] ? "" : @options[:date_separator]
    when :hour
      (@options[:discard_year] && @options[:discard_day]) ? "" : @options[:datetime_separator]
    when :minute, :second
      @options[:"discard_#{type}"] ? "" : @options[:time_separator]
  end
end