From: "NARUSE, Yui" Date: 2007-12-27T18:33:00+09:00 Subject: [ruby-dev:32823] class TimeSpan This is a multi-part message in MIME format. --------------050108060700040304090103 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit 成瀬です。 [ruby-list:44398] で DateTime に対する加算が話題になっていますが、現在の 方法は以下のような欠点があると思います。 * Rational を使う方法は直観的でない * 24*60 等マジックナンバーを頻繁に用いる必要がある * Time は秒、Date/DateTimeは日を基本単位としているため、 　値を流用するとはまる > puts Time.now + 3600 2007-12-27 19:19:44 +0900 #1時間後 > puts DateTime.now + 3600 2017-11-04T18:11:58+09:00 #10年後！ TimeSpan のようなクラスを追加すると以下のようになって誤解が少なくなるの ですが、いかがでしょうか。 > puts Time.now + TimeSpan(:days => 1) 2007-12-28 17:57:40 +0900 > puts Time.now + TimeSpan(:hours => 1) 2007-12-27 18:57:40 +0900 > puts DateTime.now + TimeSpan(:days => 1) 2007-12-28T17:57:40+09:00 > puts DateTime.now + TimeSpan(:hours => 1) 2007-12-27T18:57:40+09:00 -- NARUSE, Yui DBDB A476 FDBD 9450 02CD 0EFC BCE3 C388 472E C1EA --------------050108060700040304090103 Content-Type: text/plain; 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