{"id":13931,"date":"2013-06-25T17:08:43","date_gmt":"2013-06-25T08:08:43","guid":{"rendered":"http:\/\/lab.synergy-marketing.co.jp\/blog\/?p=5380"},"modified":"2018-11-14T16:33:54","modified_gmt":"2018-11-14T07:33:54","slug":"timezone-on-java","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2013\/06\/25\/timezone-on-java\/","title":{"rendered":"Java \u306e TimeZone"},"content":{"rendered":"

\u5148\u65e5 Java \u306e Web \u30a2\u30d7\u30ea\u3067\u30ed\u30b0\u306b\u51fa\u529b\u3055\u308c\u308b\u6642\u9593\u304c UTC \u3067\u51fa\u529b\u3055\u308c\u308b\u3068\u3044\u3046\u4e8b\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u65e5\u672c\u306b\u4f4f\u3093\u3067\u3044\u308b\u306e\u3067 JST \u3067\u8868\u793a\u3055\u308c\u306a\u3044\u3068\u7d1b\u3089\u308f\u3057\u304f\u3066\u56f0\u308a\u307e\u3059\u3002
\n\u3059\u3050\u306b\u601d\u3044\u3064\u3044\u305f\u306e\u304c \/etc\/localtime<\/code> \u304c UTC \u306b\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3067\u3057\u305f\u304c\u3001\u9055\u3044\u307e\u3057\u305f\u3002\u3061\u3083\u3093\u3068 Asia\/Tokyo \u306b\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u306b\u306a\u3063\u3066\u304a\u308a date \u30b3\u30de\u30f3\u30c9\u306e\u51fa\u529b\u3082 JST \u3067\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u6b21\u306b\u7591\u3063\u305f\u306e\u306f\u74b0\u5883\u5909\u6570\u3067\u3059\u3002\u3057\u304b\u3057\u3001\/proc\/<pid>\/environ<\/code> \u3092\u898b\u3066\u3082 TZ \u306a\u3069\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u306f\u3044\u307e\u305b\u3093\u3002\u305f\u3081\u3057\u306b TZ \u3092\u8a2d\u5b9a\u3057\u3066\u8d77\u52d5\u3059\u308b\u3068\u3001\u610f\u56f3\u901a\u308a\u30ed\u30b0\u306b\u51fa\u529b\u3055\u308c\u308b\u6642\u9593\u306f JST \u3067\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3068\u308a\u3042\u3048\u305a\u3053\u308c\u3067\u76f4\u308b\u3068\u8a00\u3048\u3070\u76f4\u308b\u306e\u3067\u3059\u304c\u3001\u3069\u3046\u3082\u6c17\u306b\u306a\u308a\u307e\u3059\u3057\u3001\u6c17\u6301\u3061\u60aa\u3044\u3067\u3059\u3002<\/p>\n

Web \u3092\u691c\u7d22\u3057\u3066\u3044\u304f\u3064\u304b\u306e\u30da\u30fc\u30b8\u3092\u898b\u3066\u898b\u307e\u3057\u305f\u304c\u3001\u51fa\u3066\u304f\u308b\u306e\u306f \/etc\/localtime<\/code> \u3084\u74b0\u5883\u5909\u6570\u3068 Java \u306e\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3 user.timezone<\/code> \u306e\u3053\u3068\u3060\u3051\u3067\u3059\u3002<\/p>\n

\u307e\u305a\u306f\u691c\u8a3c\u7528\u306e\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u307e\u3057\u305f\u3002<\/p>\n

public class Main {\n    public static void main(String[] args) {\n        System.out.println(new java.text.SimpleDateFormat(\"z\").format(new java.util.Date()));\n        System.out.println(java.util.TimeZone.getDefault().getID());\n        System.out.println(System.getProperty(\"user.timezone\"));\n    }\n}<\/pre>\n
\u554f\u984c\u306e\u3042\u308b\u30b5\u30fc\u30d0\u4e0a\u3067\u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u7d50\u679c\u3092\u5f97\u307e\u3057\u305f\u3002<\/p>\n
$ java Main\nUTC\nEtc\/UTC\nEtc\/UTC<\/pre>\n
\u6b21\u306b\u3001\u554f\u984c\u306e\u306a\u3044\u30b5\u30fc\u30d0\u3067\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u7d50\u679c\u3092\u5f97\u307e\u3057\u305f\u3002<\/p>\n
$ java Main\nJST\nAsia\/Tokyo\nAsia\/Tokyo<\/pre>\n
\u3044\u305a\u308c\u306e\u30b5\u30fc\u30d0\u3067\u3082\u00a0\/etc\/timezone<\/code> \u306f Asia\/Tokyo \u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3057\u3001\u74b0\u5883\u5909\u6570\u3084\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\u3082\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u4f55\u304b OS \u306e\u8a2d\u5b9a\u304c\u95a2\u4fc2\u3057\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3057 \/etc \u4ee5\u4e0b\u3092\u63a2\u3057\u3066\u307f\u308b\u3068\u2026\u3001\u3042\u308a\u307e\u3057\u305f\u3002\/etc\/timezone<\/code> \u3067\u3059\u3002\u554f\u984c\u306e\u3042\u308b\u30b5\u30fc\u30d0\u306b\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308a\u3001\u5185\u5bb9\u306f Etc\/UTC<\/code> \u306b\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u554f\u984c\u306e\u306a\u3044\u30b5\u30fc\u30d0\u3067\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u65e9\u901f\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092 Asia\/Tokyo<\/code> \u306b\u66f8\u304d\u63db\u3048\u3066\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001<\/p>\n
$ java Main\nJST\nAsia\/Tokyo\nAsia\/Tokyo<\/pre>\n
\u30d3\u30f3\u30b4\u3067\u3059\u3002<\/p>\n
\u6c17\u306b\u306a\u3063\u305f\u306e\u3067 \/etc\/timezone \u306e\u5185\u5bb9\u306f Asia\/Tokyo<\/code> \u306e\u307e\u307e\u306b\u3057\u3066 \/etc\/localtime \u3092 UTC \u3092\u6307\u3059\u3088\u3046\u306b\u3057\u3066\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068<\/p>\n
$ cat \/etc\/timezone \nAsia\/Tokyo\n$ ls --time-style=iso -l \/etc\/localtime \nlrwxrwxrwx 1 root root 27 06-25 07:42 \/etc\/localtime -> \/usr\/share\/zoneinfo\/Etc\/UTC\n$ date +%Z\nUTC\n$ java Main\nJST\nAsia\/Tokyo\nAsia\/Tokyo<\/pre>\n
\u4e88\u60f3\u901a\u308a \/etc\/localtime<\/code> \u3088\u308a\u3082 \/etc\/timezone<\/code> \u306e\u65b9\u304c\u512a\u5148\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
\u3053\u306e \/etc\/timezone<\/code> \u306f debian \u7cfb\u306e Ubuntu \u306b\u306f\u3042\u308a\u307e\u3057\u305f\u304c Red Hat \u7cfb\u306e CentOS \u3084 Scientific Linux \u306b\u306f\u78ba\u8a8d\u3057\u305f\u9650\u308a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3061\u306a\u307f\u306b Red Hat \u7cfb\u306e\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u3082 \/etc\/timezone<\/code> \u3092\u4f5c\u3063\u3066\u3084\u308b\u3068\u305d\u3061\u3089\u304c\u512a\u5148\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u4eca\u56de\u306e\u691c\u8a3c\u306f Ubuntu 12.04 \u53ca\u3073 Scientific Linux 6.4 \u4e0a\u3067\u884c\u3044\u307e\u3057\u305f\u3002
\njava.util.TimeZone<\/code> \u3067\u306f\u6700\u7d42\u7684\u306b native \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3067\u3044\u308b\u305f\u3081\u4ed6\u306e\u74b0\u5883\u3067\u306f\u7d50\u679c\u304c\u7570\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5148\u65e5 Java \u306e Web \u30a2\u30d7\u30ea\u3067\u30ed\u30b0\u306b\u51fa\u529b\u3055\u308c\u308b\u6642\u9593\u304c UTC \u3067\u51fa\u529b\u3055\u308c\u308b\u3068\u3044\u3046\u4e8b\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u65e5\u672c\u306b\u4f4f\u3093\u3067\u3044\u308b\u306e\u3067 JST \u3067\u8868\u793a\u3055\u308c\u306a\u3044\u3068\u7d1b\u3089\u308f\u3057\u304f\u3066\u56f0\u308a\u307e\u3059\u3002
\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[261,262,18],"tags":[],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13931"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/33"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=13931"}],"version-history":[{"count":1,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13931\/revisions"}],"predecessor-version":[{"id":13936,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13931\/revisions\/13936"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=13931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=13931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=13931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}