{"id":2575,"date":"2021-06-08T23:52:35","date_gmt":"2021-06-08T15:52:35","guid":{"rendered":"http:\/\/ufqi.com\/blog\/?p=2575"},"modified":"2021-06-10T16:01:56","modified_gmt":"2021-06-10T08:01:56","slug":"gmt-utc-timezone-daylight-saving","status":"publish","type":"post","link":"https:\/\/ufqi.com\/blog\/gmt-utc-timezone-daylight-saving\/","title":{"rendered":"gmt, utc, timezone, daylight saving\uff0c\u65f6\u533a\u548c\u590f\u4ee4\u65f6"},"content":{"rendered":"<p>\u5728\u963f\u91cc\u5df4\u5df4\u7684Java\u7f16\u7a0b\u89c4\u8303\u4e2d\uff0c\u6709\u4e00\u6761\u63a8\u8350\u662f\uff1a<br \/><strong>13. \u3010\u63a8\u8350\u3011\u524d\u540e\u7aef\u7684\u65f6\u95f4\u683c\u5f0f\u7edf\u4e00\u4e3a&#8221;yyyy-MM-dd HH:mm:ss&#8221;\uff0c\u7edf\u4e00\u4e3aGMT\u3002<\/strong><\/p>\n<p>\uff08\u00a0<a href=\"https:\/\/ufqi.com\/news\/ulongpage.1524.html\">https:\/\/ufqi.com\/news\/ulongpage.1524.html<\/a>?tit=Java\u958b\u767c\u624b\u518a-\u963f\u91cc\u5df4\u5df4-\u5d69\u5c71\u7248-11\uff1a\u524d\u540e\u7aef\u89c4\u7ea6\u00a0\uff09<\/p>\n<p>\u5176\u4e2d\u7684\u91cd\u70b9\u662f\u201c\u7edf\u4e00\u4e3aGMT\u201d\uff0c \u53ef\u4ee5\u8bbe\u60f3\u4f5c\u4e3a\u8de8\u56fd\u96c6\u56e2\u4f01\u4e1a\uff0c\u7531\u4e8e\u6709\u591a\u4e2a\u65f6\u533a\u7684\u5728\u7ebf\u4f5c\u4e1a\u7cfb\u7edf\uff0c\u5982\u679c\u4e0d\u7edf\u4e00\u65f6\u533a\uff0c\u5404\u4e2a\u9700\u8981\u901a\u4fe1\u7684\u670d\u52a1\u5668\u4e4b\u95f4\u4f1a\u4e71\u6210\u5565\u3002<strong>\u4e24\u4e2a\u90fd\u662f\u516b\u70b9\u670d\u52a1\u5668\u53ef\u80fd\u4e00\u4e2a\u662f\u65e9\u4e0a\u516b\u70b9\uff0c\u4e00\u4e2a\u665a\u4e0a\u516b\u70b9\uff0c\u8fd8\u53ef\u80fd\u662f\u524d\u4e00\u5929\u7684\u516b\u70b9\uff0c\u6216\u8005\u540e\u4e00\u5929\u7684\u516b\u70b9<\/strong>\u3002<\/p>\n<p>\u670d\u52a1\u5668\u4e4b\u95f4\u8981\u7edf\u4e00\u65f6\u95f4\u548c\u65f6\u533a\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u4e5f\u9700\u8981\u7edf\u4e00\u65f6\u95f4\/\u65f6\u533a\uff0c\u6709\u4e9b\u5bf9\u65f6\u95f4\u654f\u611f\u7684\u901a\u4fe1\u9700\u8981\u9a8c\u8bc1\u65f6\u95f4\uff0c\u5982\u679c\u53ea\u62a5\u65f6\u95f4\u662f\u516b\u70b9\u662f\u8fdc\u8fdc\u4e0d\u591f\u7684\u3002\u8fd9\u53ef\u80fd\u662f\u963f\u91cc\u5df4\u5df4\u5728Java\u7f16\u7a0b\u64cd\u4f5c\u624b\u518c\u4e2d\u63a8\u8350\u8fd9\u6761\u89c4\u7ea6\u7684\u539f\u56e0\u4e4b\u4e00\u5427\u3002<\/p>\n<p>\u6240\u4ee5\u8de8\u56fd\u96c6\u56e2\u4f01\u4e1a\u7684\u670d\u52a1\u5668\u65f6\u95f4\u5fc5\u987b\u7edf\u4e00\uff0c\u4e3a\u5565\u201c\u7edf\u4e00\u4e3aGMT\u201d\u5462\uff1f<\/p>\n<p><strong>GMT \u662f\u65f6\u533atimezone\u5e8f\u5217\u4e2d\u552f\u4e00\u4e0d\u53d7\u590f\u4ee4\u65f6\/\u51ac\u4ee4\u65f6\/\u65e5\u95f4\u706f\u8282\u7ea6\u65f6\u95f4\u8c03\u6574\u7684\u65f6\u533a\u3002\u4e0e\u4e4b\u5bf9\u5e94\u7684\u662f UTC\uff0c\u4f46UTC\u4e0d\u662f\u65f6\u533atimezone\u7684\u6982\u5ff5<\/strong>\u3002<\/p>\n<ul>\n<li><a href=\"https:\/\/www.timeanddate.com\/time\/zones\/gmt\"><strong>GMT\uff08Greenwich Mean Time\uff09 is a time zone<\/strong><\/a>\u00a0officially used in some European and African countries. The time can be displayed using both the 24-hour format (0 &#8211; 24) or the 12-hour format (1 &#8211; 12 am\/pm).<\/li>\n<li><a href=\"https:\/\/www.timeanddate.com\/time\/aboututc.html\"><strong>UTC\uff08Coordinated Universal Time\uff09 is not a time zone<\/strong><\/a>, but a time standard that is the basis for civil time and time zones worldwide. This means that no country or territory officially uses UTC as a local time.<\/li>\n<\/ul>\n<p>\u4e0d\u72ec\u5728Java\u7f16\u7a0b\u89c4\u8303\u4e2d\u9700\u8981\u6ce8\u610f\u65f6\u95f4\u548c\u65f6\u533a\u7684\u95ee\u9898\uff0c\u5728\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u4e5f\u9700\u8981\u6ce8\u610f\u3002\u6bd4\u5982PHP\u4e2d\uff0c<\/p>\n<p># standard timezone\u00a0with winter or summer time<br \/>date_default_timezone_set(&#8220;Europe\/London&#8221;);<br \/># standard timezone without winter or summer time\u00a0<br \/>date_default_timezone_set(&#8220;GMT&#8221;);<br \/># non-standard timezone, but compatible\u00a0<br \/>date_default_timezone_set(&#8220;UTC&#8221;);\u00a0<\/p>\n<p>\u00a0\u8fd9\u4e09\u4e2a\u8bbe\u7f6e\uff0c\u5728\u51ac\u4ee4\u65f6\uff0c\u8fd4\u56de\u7684\u65f6\u95f4\u662f\u4e00\u6837\u7684\uff0c\u4f46\u5982\u679c\u5728\u590f\u4ee4\u65f6\uff0c\u7b2c\u4e00\u4e2a\u8fd4\u56de\u7684\u65f6\u95f4\u5c31\u4e0e\u540e\u9762\u4e24\u4e2a\u4e0d\u4e00\u6837\u4e86\u3002<\/p>\n<p>\u5bf9\u5e94\u5730\uff0c\u5728Java\u7f16\u7a0b\u4e2d\uff0c\u9664\u4e86\u5728\u670d\u52a1\u5668\u5c42\u9762\u8bbe\u7f6etimezone\uff0c\u4e5f\u53ef\u4ee5\u5728\u4ee3\u7801\u5c42\u9762\u8bbe\u7f6e\u8fd0\u884c\u65f6timezone\u7684\u6307\u5b9a\uff1a<\/p>\n<p>System.setProperty(<span class=\"hljs-string\">&#8220;user.timezone&#8221;<\/span>,\u00a0\u00a0<span class=\"hljs-string\">&#8220;Europe\/London&#8221;<\/span>);<br \/>System.setProperty(<span class=\"hljs-string\">&#8220;user.timezone&#8221;<\/span>,\u00a0\u00a0<span class=\"hljs-string\">&#8220;GMT+0000&#8221;<\/span>);<\/p>\n<p>Java JDK\u7684\u76f8\u5173\u8bf4\u660e\uff1a \uff08\u00a0https:\/\/docs.oracle.com\/en\/java\/javase\/11\/docs\/api\/java.base\/java\/util\/TimeZone.html \uff09The syntax of a custom time zone ID is:<\/p>\n<blockquote>\n<pre> <i>CustomID:<\/i>\r\n         <code>GMT<\/code> <i>Sign<\/i> <i>Hours<\/i> <code>:<\/code> <i>Minutes<\/i>\r\n         <code>GMT<\/code> <i>Sign<\/i> <i>Hours<\/i> <i>Minutes<\/i>\r\n         <code>GMT<\/code> <i>Sign<\/i> <i>Hours<\/i>\r\n <i>Sign:<\/i> one of\r\n         <code>+ -<\/code>\r\n <i>Hours:<\/i>\r\n         <i>Digit<\/i>\r\n         <i>Digit<\/i> <i>Digit<\/i>\r\n <i>Minutes:<\/i>\r\n         <i>Digit<\/i> <i>Digit<\/i>\r\n <i>Digit:<\/i> one of\r\n         <code>0 1 2 3 4 5 6 7 8 9<\/code>\r\n <\/pre>\n<\/blockquote>\n<p><i>Hours<\/i>\u00a0must be between 0 to 23 and\u00a0<i>Minutes<\/i>\u00a0must be between 00 to 59. For example, &#8220;GMT+10&#8221; and &#8220;GMT+0010&#8221; mean ten hours and ten minutes ahead of GMT, respectively.<\/p>\n<p>\u5f53\u7136\uff0c\u8f83\u597d\u7684\u8bbe\u7f6etimezone\u7684\u65b9\u5f0f\u662f\u5728\u670d\u52a1\u5668\u5c42\u9762\uff0c\u5728\u7f16\u7a0b\u8bed\u8a00\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u6bd4\u5982 PHP\u4e2d\u7684php.inc \u6587\u4ef6\uff0c\u6216\u8005 Java\u7684Jvm\u53c2\u6570\u65b9\u5f0f\uff1ajava -Duser.timezone=<span class=\"hljs-string\">&#8220;Asia\/Chongqing&#8221; \u3002<\/span><\/p>\n<p><img loading=\"lazy\" class=\"\" src=\"https:\/\/ufqi.com\/blog\/wp-content\/uploads\/2021\/06\/%E4%B8%96%E7%95%8C%E6%97%B6%E5%8C%BA%E5%9B%BEtimezone-map.jpg\" width=\"656\" height=\"405\" \/><\/p>\n<p>\u5728 <a href=\"http:\/\/ufqi.com\/dev\/gmis\">gMIS\u5409\u5bc6\u65af<\/a>\uff08\u00a0https:\/\/ufqi.com\/dev\/gmis\/ \uff09\u7684\u5934\u90e8\u8fd0\u884c\u65f6\u8bbe\u7f6e\u4e2d\uff0c\u5df2\u7ecf\u542f\u7528\u4e86\u5c06\u5f53\u524d\u8fd0\u884c\u65f6\u73af\u5883\u7684\u65f6\u533atimezone\u8bbe\u7f6e\u4e3a GMT\uff1b<br \/>\u5728 <a href=\"http:\/\/ufqi.com\/dev\/gwa2\">GWA2\u5409\u5a03\u5154<\/a>\uff08\u00a0https:\/\/ufqi.com\/dev\/gwa2\/ \uff09\u7684\u5934\u90e8\u8fd0\u884c\u65f6\u8bbe\u7f6e\u4e2d\uff0c\u5df2\u7ecf\u542f\u7528\u4e86\u5c06\u5f53\u524d\u8fd0\u884c\u65f6\u73af\u5883\u7684timezone\u65f6\u533a\u8bbe\u7f6e\u4e3aGMT\u3002<\/p>\n<p>\u7f8e\u56fd\u4eba\u7eb3\u65af\u8fbe\u514b\u603b\u662f\u665a\u4e0a\u5f00\u76d8\u5077\u6478\u7092\u80a1\uff1f<\/p>\n<p><b><a class=\"bigfont\" href=\"https:\/\/ufqi.com\/naturedns\/search?q=-R\/o2SR\" target=\"_blank\">-R\/o2SR<\/a><\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u963f\u91cc\u5df4\u5df4\u7684Java\u7f16\u7a0b\u89c4\u8303\u4e2d\uff0c\u6709\u4e00\u6761\u63a8\u8350\u662f\uff1a13. \u3010\u63a8\u8350\u3011\u524d\u540e\u7aef\u7684\u65f6\u95f4\u683c\u5f0f\u7edf &hellip; <a href=\"https:\/\/ufqi.com\/blog\/gmt-utc-timezone-daylight-saving\/\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[41,42,7,6,2],"tags":[421,146,84,423,422,424],"_links":{"self":[{"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/posts\/2575"}],"collection":[{"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/comments?post=2575"}],"version-history":[{"count":5,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/posts\/2575\/revisions"}],"predecessor-version":[{"id":2582,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/posts\/2575\/revisions\/2582"}],"wp:attachment":[{"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/media?parent=2575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/categories?post=2575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ufqi.com\/blog\/wp-json\/wp\/v2\/tags?post=2575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}