{"author_url":"https://blog.hatena.ne.jp/kikiki-kiki/","categories":["Ruby"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchaika.hatenablog.com%2Fentry%2F2016%2F03%2F31%2F171514\" title=\"Ruby \u65e5\u4ed8\u304c\u5b58\u5728\u3059\u308b\u304b\u77e5\u308a\u305f\u3044 - \u304b\u3082\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://chaika.hatenablog.com/entry/2016/03/31/171514","version":"1.0","title":"Ruby \u65e5\u4ed8\u304c\u5b58\u5728\u3059\u308b\u304b\u77e5\u308a\u305f\u3044","provider_url":"https://hatena.blog","width":"100%","description":"require \"date\" p Date.new(2015, 2, 29) #=> `new': invalid date (ArgumentError) \u5b58\u5728\u3057\u306a\u3044\u65e5\u4ed8\u3067Date\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308d\u3046\u3068\u3059\u308b\u3068ArgumentError\u3067\u6b7b\u3093\u3067\u3057\u307e\u3046\u306e\u3067\u3001Date\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308b\u524d\u306b\u65e5\u4ed8\u304c\u5b58\u5728\u3059\u308b\u304b\u77e5\u308a\u305f\u3044\u3002 Date.valid_date?\u3092\u4f7f\u3046 Date.valid_date?(year, mon, mday, start = Date::GREGORIAN) -> bool p Date.valid_date?(2015, 2, 29) #=> false p Date.valid_d\u2026","provider_name":"Hatena Blog","type":"rich","image_url":"http://ecx.images-amazon.com/images/I/51vDE-JnVDL.jpg","height":"190","author_name":"kikiki-kiki","blog_url":"https://chaika.hatenablog.com/","blog_title":"\u304b\u3082\u30e1\u30e2","published":"2016-03-31 17:15:14"}