--- File.atime(filename)
--- File.ctime(filename)
--- File.mtime(filename)

    줾졢եκǽ/֤Ǹѹ줿
    ǽ(Time ֥)֤ޤ

    եλμ˼Ԥ㳰 Errno::EXXX ȯ
    ޤ

