まともとさん曰く。 「区切りのTは使わない」はISO8601に適合してますよ。 う〜ん、そんな話あったかなぁ。とりあえず英語版 Wikipedia を見てみる*1。 The date and time representations may sometimes appear in proximity, separated by a space or other characters, in which case they occupy two separate fields in a data system, rather than a single combined representation. This is sometimes done for human readability. Unlike the above example, "1981-04-05" "14:30:30-0