{"id":1095,"date":"2025-12-31T17:27:50","date_gmt":"2025-12-31T09:27:50","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=1095"},"modified":"2025-12-31T17:27:50","modified_gmt":"2025-12-31T09:27:50","slug":"system-currenttimemillis","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/12\/31\/system-currenttimemillis\/","title":{"rendered":"system.currenttimemillis()"},"content":{"rendered":"\n<p>\u4f60\u63d0\u5230\u7684 <strong><code>System.currentTimeMillis()<\/code><\/strong> \u662f <strong>Java \u4e2d\u7684\u4e00\u4e2a\u7cfb\u7edf\u65b9\u6cd5<\/strong>\uff0c\u7528\u4e8e\u83b7\u53d6 <strong>\u5f53\u524d\u65f6\u95f4\u7684\u6beb\u79d2\u6570\uff08\u81ea 1970 \u5e74 1 \u6708 1 \u65e5 00:00:00 UTC \u8d77\u7684\u6beb\u79d2\u6570\uff09<\/strong>\u3002\u6211\u7ed9\u4f60\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u5305\u62ec\u7528\u6cd5\u3001\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u8bed\u6cd5<\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nlong currentTimeMillis = System.currentTimeMillis();\n\n<\/pre><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u56de\u503c\u7c7b\u578b\uff1a<code>long<\/code><\/li>\n\n\n\n<li>\u5355\u4f4d\uff1a\u6beb\u79d2\uff08ms\uff09<\/li>\n\n\n\n<li>\u57fa\u51c6\u65f6\u95f4\uff1a<strong>Unix \u7eaa\u5143\uff081970-01-01 00:00:00 UTC\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u793a\u4f8b\u4ee3\u7801<\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npublic class CurrentTimeExample {\n    public static void main(String&#x5B;] args) {\n        long millis = System.currentTimeMillis();\n        System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u6beb\u79d2\u6570\uff1a&quot; + millis);\n\n        \/\/ \u8f6c\u4e3a\u79d2\n        long seconds = millis \/ 1000;\n        System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u79d2\u6570\uff1a&quot; + seconds);\n\n        \/\/ \u8f6c\u4e3a Date \u5bf9\u8c61\n        java.util.Date date = new java.util.Date(millis);\n        System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u65e5\u671f\u5bf9\u8c61\uff1a&quot; + date);\n    }\n}\n\n<\/pre><\/div>\n\n\n<p><strong>\u793a\u4f8b\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n\u5f53\u524d\u65f6\u95f4\u6beb\u79d2\u6570\uff1a1735689600000\n\u5f53\u524d\u65f6\u95f4\u79d2\u6570\uff1a1735689600\n\u5f53\u524d\u65f6\u95f4\u65e5\u671f\u5bf9\u8c61\uff1aTue Dec 31 15:00:00 CST 2025\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e38\u89c1\u7528\u9014<\/h2>\n\n\n\n<p>1\ufe0f\u20e3 <strong>\u8ba1\u7b97\u65f6\u95f4\u5dee \/ \u6267\u884c\u8017\u65f6<\/strong>\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nlong start = System.currentTimeMillis();\n\/\/ \u6267\u884c\u67d0\u6bb5\u8017\u65f6\u4ee3\u7801\nlong end = System.currentTimeMillis();\nSystem.out.println(&quot;\u8017\u65f6\uff1a&quot; + (end - start) + &quot; \u6beb\u79d2&quot;);\n\n<\/pre><\/div>\n\n\n<p>2\ufe0f\u20e3 <strong>\u751f\u6210\u65f6\u95f4\u6233\uff08Timestamp\uff09<\/strong>\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nString timestamp = String.valueOf(System.currentTimeMillis());\nSystem.out.println(timestamp); \/\/ \u53ef\u7528\u4e8e\u552f\u4e00 ID\n\n<\/pre><\/div>\n\n\n<p>3\ufe0f\u20e3 <strong>\u4e0e Date \/ Calendar \/ Instant \u4e92\u8f6c<\/strong>\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n\/\/ Java 8\njava.time.Instant instant = java.time.Instant.ofEpochMilli(System.currentTimeMillis());\nSystem.out.println(instant);\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7cfb\u7edf\u65f6\u95f4\u53ef\u88ab\u4fee\u6539<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>System.currentTimeMillis()<\/code> \u4f9d\u8d56\u64cd\u4f5c\u7cfb\u7edf\u65f6\u95f4\uff0c\u5982\u679c\u7cfb\u7edf\u65f6\u95f4\u88ab\u4fee\u6539\uff0c\u8fd4\u56de\u503c\u4f1a\u53d8\u5316<\/li>\n\n\n\n<li>\u5bf9\u4e8e<strong>\u7cbe\u786e\u6d4b\u91cf\u65f6\u95f4\u95f4\u9694<\/strong>\uff0c\u5efa\u8bae\u4f7f\u7528\uff1a<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nlong nanoStart = System.nanoTime();\n\n<\/pre><\/div>\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e0e\u65f6\u533a\u65e0\u5173<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u56de\u7684\u662f UTC \u65f6\u95f4\u7684\u6beb\u79d2\u6570<\/li>\n\n\n\n<li>\u8f6c\u6362\u4e3a\u672c\u5730\u65f6\u95f4\u9700\u8981 Date \/ Calendar \/ LocalDateTime<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u5bf9\u6bd4 <code>System.nanoTime()<\/code><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u65b9\u6cd5<\/th><th>\u5355\u4f4d<\/th><th>\u7528\u9014<\/th><th>\u65f6\u533a\u5f71\u54cd<\/th><\/tr><\/thead><tbody><tr><td><code>currentTimeMillis()<\/code><\/td><td>\u6beb\u79d2<\/td><td>\u83b7\u53d6\u5f53\u524d\u65f6\u95f4<\/td><td>UTC<\/td><\/tr><tr><td><code>nanoTime()<\/code><\/td><td>\u7eb3\u79d2<\/td><td>\u7cbe\u786e\u6d4b\u91cf\u8017\u65f6<\/td><td>\u65e0\uff08\u76f8\u5bf9\u65f6\u95f4\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u4e00\u53e5\u8bdd\u603b\u7ed3<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong><code>System.currentTimeMillis()<\/code> = \u83b7\u53d6\u81ea 1970-01-01 00:00:00 UTC \u5230\u5f53\u524d\u65f6\u95f4\u7684\u6beb\u79d2\u6570\uff0c\u5e38\u7528\u4e8e\u65f6\u95f4\u6233\u3001\u8ba1\u7b97\u8017\u65f6\u548c\u65e5\u671f\u8f6c\u6362\u3002<\/strong><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u4f60\u63d0\u5230\u7684 System.currentTimeMillis() \u662f Java \u4e2d&#8230; 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