{"height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyuyarin.hatenadiary.org%2Fentry%2F20110821%2F1313914531\" title=\"Ruby\u3067\u76f4\u524d\u306e\u65e5\u66dc\u65e5\u306e\u65e5\u6642\u3092\u6c42\u3081\u308b - yuyarin\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Ruby\u3067\u76f4\u524d\u306e\u65e5\u66dc\u65e5\u306e\u65e5\u6642\u3092\u6c42\u3081\u308b","provider_url":"https://hatena.blog","author_name":"yuyarin","categories":["Ruby"],"version":"1.0","image_url":null,"published":"2011-08-21 17:15:31","blog_title":"yuyarin\u306e\u65e5\u8a18","blog_url":"https://yuyarin.hatenadiary.org/","provider_name":"Hatena Blog","description":"rrdgraph\u3067\u65e5\u66dc\u65e5\u59cb\u307e\u308a\u306e\uff11\u9031\u9593\u30b0\u30e9\u30d5\u3092\u66f8\u304d\u305f\u3044\u6642\u306b\u5fc5\u8981\u306a\u306e\u3067\uff0eUNIX\u6642\u9593\u30670\uff0cTime.at(0)\u304cGMT\u3067\u6728\u66dc\u65e5\u306e\uff10\u6642\u306a\u306e\u3067\uff13\u65e5\u3068gmt_offset\u5206\u3060\u3051\u5e73\u884c\u79fb\u52d5\u3059\u308b\u3068\uff0c\u65e5\u66dc\u65e5\u306e\uff10\u6642\u304c\uff11\u9031\u9593(7*86400)\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u306b\u306a\u308b\u306e\u3067\u7aef\u6570\u3092\u9664\u53bb\uff0c\u305a\u3089\u3057\u305f\u5206\u3060\u3051\u5143\u306b\u623b\u3059\u3068\u76f4\u524d\u306e\u65e5\u66dc\u65e5\u306e\uff10\u6642\u306e\u6642\u523b\u304c\u5f97\u3089\u308c\u308b\uff0e def last_sunday(t) slide = 3*86400 - t.gmt_offset t = t.to_i - slide return Time.at(t-t%(7*86400)) + slide end p Time.now p last_sunday(Time\u2026","url":"https://yuyarin.hatenadiary.org/entry/20110821/1313914531","type":"rich","author_url":"https://blog.hatena.ne.jp/yuyarin/","width":"100%"}