{"categories":[],"author_name":"na_ah","height":"190","title":"\u3082\u3046\u8ff7\u308f\u306a\u3044\uff01JavaScript\u65e5\u4ed8\u3068\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u6271\u3044\u65b9 #2 - new Date() \u306e\u6319\u52d5\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b","provider_name":"Hatena Blog","blog_title":"na_ah\u306e\u30d6\u30ed\u30b0","version":"1.0","provider_url":"https://hatena.blog","type":"rich","image_url":null,"blog_url":"https://na-ah.hatenablog.com/","published":"2025-05-20 23:56:08","width":"100%","description":"\u306f\u3058\u3081\u306b \u3053\u3093\u306b\u3061\u306f\uff01 \u4eca\u56de\u306f new Date() \u306e\u6319\u52d5\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u3066\u3044\u304d\u307e\u3059\u3002 JavaScript\u306f\u65e5\u4ed8\u306e\u6271\u3044\u306b\u7656\u304c\u3042\u308b\u3068\u8a00\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u539f\u56e0\u306e\u4e00\u7aef\u306f\u3053\u306enew Date()\u306b\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002 new Date()\u306e\u6319\u52d5\u3092\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u3001\u3046\u307e\u304f\u4ed8\u304d\u5408\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01 \u65e5\u4ed8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210 (new Date) \u65e5\u4ed8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u306b\u306f new Date() \u3092\u7528\u3044\u308b new Date \u306f\u5185\u90e8\u7684\u306b\u306f UTC \u3057\u304b\u6271\u3048\u306a\u3044 1970-01-01T00:00:00Z\uff08UNIX\u6642\u9593\uff09\u304b\u3089\u306e\u7d4c\u904e\u30df\u30ea\u79d2\u3092\u4fdd\u6301\u3059\u308b \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306f\u4fdd\u6301\u3057\u306a\u3044\uff08\u5185\u90e8\u7684\u306b\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u6982\u5ff5\u306f\u306a\u3044\uff09 \u30bf\u30a4\u30e0\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fna-ah.hatenablog.com%2Fentry%2F2025%2F05%2F20%2F235608\" title=\"\u3082\u3046\u8ff7\u308f\u306a\u3044\uff01JavaScript\u65e5\u4ed8\u3068\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u6271\u3044\u65b9 #2 - new Date() \u306e\u6319\u52d5\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b - na_ah\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/na_ah/","url":"https://na-ah.hatenablog.com/entry/2025/05/20/235608"}