{"id":923229,"date":"2024-06-30T09:29:05","date_gmt":"2024-06-30T09:29:05","guid":{"rendered":"https:\/\/proxyelite.info\/?p=923229"},"modified":"2024-06-27T09:33:06","modified_gmt":"2024-06-27T09:33:06","slug":"convert-date-to-localdate-or-localdatetime-and-back","status":"publish","type":"post","link":"https:\/\/proxyelite.info\/cn\/convert-date-to-localdate-or-localdatetime-and-back\/","title":{"rendered":"\u5c06\u65e5\u671f\u8f6c\u6362\u4e3a LocalDate \u6216 LocalDateTime \u5e76\u8f6c\u56de"},"content":{"rendered":"

\u8981\u8f6c\u6362 Date<\/code> \u53cd\u5bf9 LocalDate<\/code> \u6216\u8005 LocalDateTime<\/code> \u53cd\u4e4b\u4ea6\u7136\uff0c\u5728 Java \u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 java.time<\/code> Java 8 \u4e2d\u5f15\u5165\u7684\u5305\u3002\u4e0b\u9762\u662f\u6709\u5173\u5982\u4f55\u6267\u884c\u8fd9\u4e9b\u8f6c\u6362\u7684\u8be6\u7ec6\u6307\u5357\uff1a<\/p>\n\n\n\n

1. \u8f6c\u6362 Date<\/code> \u5230 LocalDate<\/code><\/h3>\n\n\n\n

\u4f7f\u7528 Instant<\/code> \u548c ZoneId<\/code><\/strong>:<\/p>\n\n\n\n

    \n
  • \u9996\u5148\uff0c\u8f6c\u6362 Date<\/code> \u5230 Instant<\/code>.<\/li>\n\n\n\n
  • \u7136\u540e\uff0c\u4f7f\u7528 Instant<\/code> \u521b\u5efa\u4e00\u4e2a LocalDate<\/code> \u4e0e\u6240\u9700\u7684 ZoneId<\/code>.<\/li>\n<\/ul>\n\n\n\n
    import java.time.Instant;\nimport java.time.LocalDate;\nimport java.time.ZoneId;\nimport java.util.Date;\n\npublic class DateToLocalDate {\n    public static void main(String[] args) {\n        Date date = new Date(); \/\/ current date\n        Instant instant = date.toInstant();\n        LocalDate localDate = instant.atZone(ZoneId.systemDefault()).toLocalDate();\n        \n        System.out.println("Date: " + date);\n        System.out.println("LocalDate: " + localDate);\n    }\n}\n<\/code><\/pre><\/div>\n\n\n\n
      <\/ol>\n\n\n\n
      2. \u8f6c\u6362 LocalDate<\/code> \u5230 Date<\/code><\/h3>\n\n\n\n
      \u4f7f\u7528 ZoneId<\/code> \u548c Instant<\/code><\/strong>:<\/p>\n\n\n\n
        \n
      • \u8f6c\u6362 LocalDate<\/code> \u5230 ZonedDateTime<\/code> \u4e0e\u6240\u9700\u7684 ZoneId<\/code>.<\/li>\n\n\n\n
      • \u7136\u540e\uff0c\u8f6c\u6362 ZonedDateTime<\/code> \u5230 Instant<\/code> \u5e76\u7528\u5b83\u6765\u521b\u5efa\u4e00\u4e2a Date<\/code>.<\/li>\n<\/ul>\n\n\n\n
        import java.time.LocalDate;\nimport java.time.ZoneId;\nimport java.time.ZonedDateTime;\nimport java.util.Date;\n\npublic class LocalDateToDate {\n    public static void main(String[] args) {\n        LocalDate localDate = LocalDate.now(); \/\/ current date\n        ZonedDateTime zonedDateTime = localDate.atStartOfDay(ZoneId.systemDefault());\n        Date date = Date.from(zonedDateTime.toInstant());\n        \n        System.out.println("LocalDate: " + localDate);\n        System.out.println("Date: " + date);\n    }\n}\n<\/code><\/pre><\/div>\n\n\n\n
        3. \u8f6c\u6362 Date<\/code> \u5230 LocalDateTime<\/code><\/h3>\n\n\n\n
        \u4f7f\u7528 Instant<\/code> \u548c ZoneId<\/code><\/strong>:<\/p>\n\n\n\n
          \n
        • \u9996\u5148\uff0c\u8f6c\u6362 Date<\/code> \u5230 Instant<\/code>.<\/li>\n\n\n\n
        • \u7136\u540e\uff0c\u4f7f\u7528 Instant<\/code> \u521b\u5efa\u4e00\u4e2a LocalDateTime<\/code> \u4e0e\u6240\u9700\u7684 ZoneId<\/code>.<\/li>\n<\/ul>\n\n\n\n
          import java.time.Instant;\nimport java.time.LocalDateTime;\nimport java.time.ZoneId;\nimport java.util.Date;\n\npublic class DateToLocalDateTime {\n    public static void main(String[] args) {\n        Date date = new Date(); \/\/ current date\n        Instant instant = date.toInstant();\n        LocalDateTime localDateTime = instant.atZone(ZoneId.systemDefault()).toLocalDateTime();\n        \n        System.out.println("Date: " + date);\n        System.out.println("LocalDateTime: " + localDateTime);\n    }\n}\n<\/code><\/pre><\/div>\n\n\n\n
          4. \u8f6c\u6362 LocalDateTime<\/code> \u5230 Date<\/code><\/h3>\n\n\n\n
          \u4f7f\u7528 ZoneId<\/code> \u548c Instant<\/code><\/strong>:<\/p>\n\n\n\n
            \n
          • \u8f6c\u6362 LocalDateTime<\/code> \u5230 ZonedDateTime<\/code> \u4e0e\u6240\u9700\u7684 ZoneId<\/code>.<\/li>\n\n\n\n
          • \u7136\u540e\uff0c\u8f6c\u6362 ZonedDateTime<\/code> \u5230 Instant<\/code> \u5e76\u7528\u5b83\u6765\u521b\u5efa\u4e00\u4e2a Date<\/code>.<\/li>\n<\/ul>\n\n\n\n
            import java.time.LocalDateTime;\nimport java.time.ZoneId;\nimport java.time.ZonedDateTime;\nimport java.util.Date;\n\npublic class LocalDateTimeToDate {\n    public static void main(String[] args) {\n        LocalDateTime localDateTime = LocalDateTime.now(); \/\/ current date and time\n        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.systemDefault());\n        Date date = Date.from(zonedDateTime.toInstant());\n        \n        System.out.println("LocalDateTime: " + localDateTime);\n        System.out.println("Date: " + date);\n    }\n}\n<\/code><\/pre><\/div>\n\n\n\n
            5. \u603b\u7ed3<\/h3>\n\n\n\n
              \n
            • \u4ece Date<\/code> \u5230 LocalDate<\/code> \u6216\u8005 LocalDateTime<\/code><\/strong>:\n
                \n
              • \u8f6c\u53d8 Date<\/code> \u5230 Instant<\/code>.<\/li>\n\n\n\n
              • \u4f7f\u7528 Instant<\/code> \u548c ZoneId<\/code> \u521b\u9020 LocalDate<\/code> \u6216\u8005 LocalDateTime<\/code>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
              • \u4ece LocalDate<\/code> \u6216\u8005 LocalDateTime<\/code> \u5230 Date<\/code><\/strong>:\n
                  \n
                • \u4f7f\u7528 ZoneId<\/code> \u521b\u9020 ZonedDateTime<\/code>.<\/li>\n\n\n\n
                • \u8f6c\u53d8 ZonedDateTime<\/code> \u5230 Instant<\/code>.<\/li>\n\n\n\n
                • \u4f7f\u7528 Instant<\/code> \u521b\u9020 Date<\/code>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                  \u8fd9\u4e9b\u65b9\u6cd5\u786e\u4fdd\u8f6c\u6362\u5c0a\u91cd\u65f6\u533a\u5e76\u7ef4\u62a4\u6b63\u786e\u7684\u65e5\u671f\u548c\u65f6\u95f4\u4fe1\u606f\u3002<\/p>\n\n\n\n
                    <\/ol>\n\n\n\n
                      <\/ol>\n\n\n\n
                        <\/ol>","protected":false},"excerpt":{"rendered":"
                        To convert a Date object to LocalDate or LocalDateTime and vice versa in Java, you can use the java.time package introduced in Java 8. Here\u2019s a detailed guide on how to perform these conversions: 1. Converting Date to LocalDate Using Instant and ZoneId: 2. Converting LocalDate to Date Using ZoneId and Instant: 3. Converting Date […]<\/p>\n","protected":false},"author":1,"featured_media":923230,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-923229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"acf":[],"_links":{"self":[{"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/posts\/923229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/comments?post=923229"}],"version-history":[{"count":0,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/posts\/923229\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/media\/923230"}],"wp:attachment":[{"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/media?parent=923229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/categories?post=923229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/proxyelite.info\/cn\/wp-json\/wp\/v2\/tags?post=923229"}],"curies":[{"name":"\u53ef\u6e7f\u6027\u7c89\u5242","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}