class RDoc::RDoc

def update_output_dir(op_dir, time, last = {})
  return if @options.dry_run or not @options.update_output_dir
  unless ENV['SOURCE_DATE_EPOCH'].nil?
    time = Time.at(ENV['SOURCE_DATE_EPOCH'].to_i).gmtime
  end
  File.open output_flag_file(op_dir), "w" do |f|
    f.puts time.rfc2822
    last.each do |n, t|
      f.puts "#{n}\t#{t.rfc2822}"
    end
  end
end