--- Time.rfc2822(date)
--- Time.rfc822(date)
    RFC:2822Ƥdate-timeȤdateѡ
    Time֥ȤѴޤ
    ηRFC:822RFC:1123ǹ줿
    ƱǤ

    dateRFC:2822˽򤷤Ƥʤޤ
    Time饹ꤵ줿ɽǤʤȤArgumentError
    ȯޤ

