{"id":30987,"date":"2024-01-04T03:22:06","date_gmt":"2024-01-27T11:25:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java8%e5%a4%84%e7%90%86%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4\/"},"modified":"2025-08-12T21:44:21","modified_gmt":"2025-08-12T13:44:21","slug":"%e4%bd%bf%e7%94%a8java8%e5%a4%84%e7%90%86%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java8%e5%a4%84%e7%90%86%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4\/","title":{"rendered":"\u4f7f\u7528Java8\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4"},"content":{"rendered":"<p>\u5728Java8\u4e2d\uff0c\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684\u7c7b\u96c6\u53d1\u751f\u4e86\u5de8\u5927\u7684\u6539\u53d8\u3002\u501f\u6b64\u673a\u4f1a\uff0c\u6211\u60f3\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u7684\u5904\u7406\u65b9\u6cd5\u6574\u7406\u4e00\u4e0b\u3002\u4e0a\u4e00\u6b21\u6211\u8bb2\u89e3\u4e86Java7\u53ca\u4e4b\u524d\u7684\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u8fd9\u6b21\u6211\u5c06\u4ecb\u7ecdJava8\u4e2d\u7684\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n<p>\u5728Java8\u4e2d\uff0c\u4e3a\u66ff\u4ee3Java7\u4e4b\u524d\u7684Date\u548cCalendar\uff0c\u5f15\u5165\u4e86\u4ee5\u4e0b\u7c7b\u7b49\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Instant &#8211; \u65e5\u6642\uff08\u30a8\u30dd\u30c3\u30af\u79d2\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">LocalDateTime &#8211; \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306a\u3057\u65e5\u6642<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">ZonedDateTime &#8211; \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3042\u308a\u65e5\u6642<\/ul>\n<h1>\u521b\u5efa\u4e00\u4e2a\u73b0\u5728\/\u6307\u5b9a\u65e5\u671f\u548c\u65f6\u95f4\u7684\u9879\u76ee\u521b\u5efa\u4e00\u4e2a\u5f53\u524d\/\u6307\u5b9a\u65e5\u671f\u548c\u65f6\u95f4\u7684 Instant \u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u73fe\u5728\u65e5\u6642<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">nowInstant<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">now<\/span><span class=\"o\">();<\/span>\r\n<span class=\"c1\">\/\/ long\u2192Instant<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">instant2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">ofEpochMilli<\/span><span class=\"o\">(<\/span><span class=\"n\">msec1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ LocalDateTime\u2192Instant<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">instant3b<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toInstant<\/span><span class=\"o\">(<\/span><span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">().<\/span><span class=\"na\">getRules<\/span><span class=\"o\">().<\/span><span class=\"na\">getOffset<\/span><span class=\"o\">(<\/span><span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">EPOCH<\/span><span class=\"o\">));<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime\u2192Instant<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">instant4ca<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toInstant<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">instant4cb<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">from<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ \u6587\u5b57\u5217\u2192Instant<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">instant5<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2007-12-03T10:15:30.00Z\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u4e00\u4e2aLocalDateTime\u7c7b\u7684\u5f53\u524d\/\u6307\u5b9a\u65e5\u671f\u65f6\u95f4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u73fe\u5728\u65e5\u6642<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">nowLocalDt<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">now<\/span><span class=\"o\">();<\/span>\r\n<span class=\"c1\">\/\/ \u6307\u5b9a\u65e5\u6642<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"mi\">2016<\/span><span class=\"o\">,<\/span> <span class=\"mi\">5<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">15<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ long\u2192LocalDateTime<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt3<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">ofEpochMilli<\/span><span class=\"o\">(<\/span><span class=\"n\">msec1<\/span><span class=\"o\">),<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ Instant\u2192LocalDateTime<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt4<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime\u2192LocalDateTime<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt5a<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDateTime<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt5b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">from<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ \u6587\u5b57\u5217\u2192LocalDateTime<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt6a<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2007-12-03T10:15:30.123\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localDt6b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2007\/12\/03 10:15:30.123\"<\/span><span class=\"o\">,<\/span>\r\n        <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss.SSS\"<\/span><span class=\"o\">));<\/span>\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u5f53\u524d\/\u6307\u5b9a\u65e5\u671f\u7684 ZonedDateTime\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u73fe\u5728\u65e5\u6642<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">nowZonedDt<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">now<\/span><span class=\"o\">(<\/span><span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Asia\/Tokyo\"<\/span><span class=\"o\">));<\/span>\r\n<span class=\"c1\">\/\/ \u6307\u5b9a\u65e5\u6642<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"mi\">2016<\/span><span class=\"o\">,<\/span> <span class=\"mi\">5<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">15<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Asia\/Tokyo\"<\/span><span class=\"o\">));<\/span>\r\n<span class=\"c1\">\/\/ long\u2192ZonedDateTime<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt3<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"nc\">Instant<\/span><span class=\"o\">.<\/span><span class=\"na\">ofEpochMilli<\/span><span class=\"o\">(<\/span><span class=\"n\">msec1<\/span><span class=\"o\">),<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ Instant\u2192ZonedDateTime<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt4a<\/span> <span class=\"o\">=<\/span> <span class=\"n\">instant1<\/span><span class=\"o\">.<\/span><span class=\"na\">atZone<\/span><span class=\"o\">(<\/span><span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt4b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ LocalDateTime\u2192ZonedDateTime<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt5a<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">atZone<\/span><span class=\"o\">(<\/span><span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">());<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt5b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofLocal<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">(),<\/span> <span class=\"kc\">null<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ \u6587\u5b57\u5217\u2192ZonedDateTime\u578b<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt6a<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2007-12-03T10:15:30+01:00[Europe\/Paris]\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt6b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2016\/05\/02 10:15:30 Asia\/Tokyo\"<\/span><span class=\"o\">,<\/span>\r\n        <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss VV\"<\/span><span class=\"o\">));<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedDt6c<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ZonedDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2016\/05\/02 10:15:30 JST\"<\/span><span class=\"o\">,<\/span>\r\n        <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss zzz\"<\/span><span class=\"o\">));<\/span>\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u5f53\u524d\/\u6307\u5b9a\u65e5\u671f\u548c\u65f6\u95f4\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ Instant\u2192\u6587\u5b57\u5217<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">instantStr1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ISO_INSTANT<\/span><span class=\"o\">.<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">instantStr2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss.SSS\"<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"o\">.<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">()));<\/span>\r\n<span class=\"c1\">\/\/ LocalDateTime\u2192\u6587\u5b57\u5217<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">localStr1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss.SSS\"<\/span><span class=\"o\">).<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime\u2192\u6587\u5b57\u5217<\/span>\r\n<span class=\"c1\">\/\/ \"xxxxx VV\" - \uff08\u4f8b\uff09\"+09:00 Asia\/Tokyo\"<\/span>\r\n<span class=\"c1\">\/\/ \"xxxx zzz\" - \uff08\u4f8b\uff09\"+0900 JST\"<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">zonedStr1a<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss.SSSxxxxx VV\"<\/span><span class=\"o\">).<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">zonedStr1b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"yyyy\/MM\/dd HH:mm:ss.SSSxxxx zzz\"<\/span><span class=\"o\">).<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h1>\u4ece\u65e5\u671f\u65f6\u95f4\u4e2d\u63d0\u53d6\u65e5\u671f\/\u65f6\u95f4<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ Instant \u65e5\u6642\u2192\u65e5\u4ed8<\/span>\r\n<span class=\"nc\">Instant<\/span> <span class=\"n\">ymdInstant1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">instant1<\/span><span class=\"o\">.<\/span><span class=\"na\">truncatedTo<\/span><span class=\"o\">(<\/span><span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ LocalDateTime \u65e5\u6642\u2192\u65e5\u4ed8\u3001\u6642\u523b<\/span>\r\n<span class=\"nc\">LocalDate<\/span> <span class=\"n\">localDate1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">LocalTime<\/span> <span class=\"n\">localTime1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalTime<\/span><span class=\"o\">();<\/span>\r\n\r\n<span class=\"c1\">\/\/ ZonedDateTime \u65e5\u6642\u2192\u65e5\u4ed8\u3001\u6642\u523b<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">ymdZoned1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">truncatedTo<\/span><span class=\"o\">(<\/span><span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">LocalDate<\/span> <span class=\"n\">localDate2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">LocalTime<\/span> <span class=\"n\">localTime2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalTime<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<h1>\u83b7\u53d6\u661f\u671f\u51e0<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ Instant\u2192\u66dc\u65e5<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">instantWeek1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"E, EEEE\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"o\">.<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">()));<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">instantWeek2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDateTime<\/span><span class=\"o\">.<\/span><span class=\"na\">ofInstant<\/span><span class=\"o\">(<\/span><span class=\"n\">instant1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ZoneId<\/span><span class=\"o\">.<\/span><span class=\"na\">systemDefault<\/span><span class=\"o\">()).<\/span><span class=\"na\">getDayOfWeek<\/span><span class=\"o\">()<\/span>\r\n        <span class=\"o\">.<\/span><span class=\"na\">getDisplayName<\/span><span class=\"o\">(<\/span><span class=\"nc\">TextStyle<\/span><span class=\"o\">.<\/span><span class=\"na\">FULL<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ LocalDateTime\u2192\u66dc\u65e5<\/span>\r\n<span class=\"c1\">\/\/ \u203b\"E\",\"EEEE\"\u306f\u3001\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u3088\u3063\u3066\u66dc\u65e5\u306e\u8868\u8a18\u304c\u5909\u308f\u308b\u3002<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">localWeek1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"E, EEEE\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">).<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">localWeek2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">getDayOfWeek<\/span><span class=\"o\">().<\/span><span class=\"na\">getDisplayName<\/span><span class=\"o\">(<\/span><span class=\"nc\">TextStyle<\/span><span class=\"o\">.<\/span><span class=\"na\">FULL<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ ZonedDateTime\u2192\u66dc\u65e5<\/span>\r\n<span class=\"c1\">\/\/ \u203b\"E\",\"EEEE\"\u306f\u3001\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306b\u3088\u3063\u3066\u66dc\u65e5\u306e\u8868\u8a18\u304c\u5909\u308f\u308b\u3002<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">zonedWeek1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DateTimeFormatter<\/span><span class=\"o\">.<\/span><span class=\"na\">ofPattern<\/span><span class=\"o\">(<\/span><span class=\"s\">\"E, EEEE\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">).<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">zonedWeek2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">getDayOfWeek<\/span><span class=\"o\">().<\/span><span class=\"na\">getDisplayName<\/span><span class=\"o\">(<\/span><span class=\"nc\">TextStyle<\/span><span class=\"o\">.<\/span><span class=\"na\">FULL<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Locale<\/span><span class=\"o\">.<\/span><span class=\"na\">JAPANESE<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h1>\u65f6\u95f4\u8ba1\u7b97<br \/>\n\u52a0\u7b97\/\u6e1b\u7b97\u53ef\u4ee5\u7b80\u5355\u5730\u5b9a\u4e49\u4e3a\u8fdb\u884c\u52a0\u6cd5\u6216\u51cf\u6cd5\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ LocalDateTime 1\u79d2\u5f8c\u30011\u65e5\u5f8c\u3001\uff11\u30f6\u6708\u5f8c<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localNextSec<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusSeconds<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localNextDay<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusDays<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localNextMonth<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusMonths<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime 1\u79d2\u5f8c\u30011\u65e5\u5f8c\u3001\uff11\u30f6\u6708\u5f8c<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedNextSec<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusSeconds<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedNextDay<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusDays<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedNextMonth<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">plusMonths<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5bfb\u627e\u6708\u521d\/\u6708\u672b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ LocalDateTime \u6708\u521d\u3001\u6708\u672b<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localMonthBeginning<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">with<\/span><span class=\"o\">(<\/span><span class=\"nc\">TemporalAdjusters<\/span><span class=\"o\">.<\/span><span class=\"na\">firstDayOfMonth<\/span><span class=\"o\">());<\/span>\r\n<span class=\"nc\">LocalDateTime<\/span> <span class=\"n\">localMonthEnd<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">with<\/span><span class=\"o\">(<\/span><span class=\"nc\">TemporalAdjusters<\/span><span class=\"o\">.<\/span><span class=\"na\">lastDayOfMonth<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime \u6708\u521d\u3001\u6708\u672b<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedMonthBeginning<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">with<\/span><span class=\"o\">(<\/span><span class=\"nc\">TemporalAdjusters<\/span><span class=\"o\">.<\/span><span class=\"na\">firstDayOfMonth<\/span><span class=\"o\">());<\/span>\r\n<span class=\"nc\">ZonedDateTime<\/span> <span class=\"n\">zonedMonthEnd<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">with<\/span><span class=\"o\">(<\/span><span class=\"nc\">TemporalAdjusters<\/span><span class=\"o\">.<\/span><span class=\"na\">lastDayOfMonth<\/span><span class=\"o\">());<\/span>\r\n<\/code><\/pre>\n<p>\u5bfb\u627e\u5dee\u5f02\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ LocalDateTime \u65e5\u6642\u306e\u5dee \u30df\u30ea\u79d2\u5358\u4f4d\u3001\u65e5\u6570\u5358\u4f4d\uff08\u5207\u308a\u6368\u3066\uff09<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">localDiffMsec<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">MILLIS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">localDiffDays1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">localDiffDays2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">(),<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ LocalDateTime \u65e5\u6642\u306e\u5dee \u6642\u5206\u79d2\u5358\u4f4d\u3001\u5e74\u6708\u65e5\u5358\u4f4d<\/span>\r\n<span class=\"nc\">Duration<\/span> <span class=\"n\">localDuration<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Duration<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">Period<\/span> <span class=\"n\">localPeriod<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Period<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">(),<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime \u65e5\u6642\u306e\u5dee \u30df\u30ea\u79d2\u5358\u4f4d\u3001\u65e5\u6570\u5358\u4f4d\uff08\u5207\u308a\u6368\u3066\uff09<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">zonedDiffMsec<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">MILLIS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">zonedDiffDays1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">zonedDiffDays2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">ChronoUnit<\/span><span class=\"o\">.<\/span><span class=\"na\">DAYS<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">(),<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">());<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime \u65e5\u6642\u306e\u5dee \u6642\u5206\u79d2\u5358\u4f4d\u3001\u5e74\u6708\u65e5\u5358\u4f4d<\/span>\r\n<span class=\"nc\">Duration<\/span> <span class=\"n\">zonedDuration<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Duration<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">,<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">Period<\/span> <span class=\"n\">zonedPeriod<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Period<\/span><span class=\"o\">.<\/span><span class=\"na\">between<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">(),<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">toLocalDate<\/span><span class=\"o\">());<\/span>\r\n<\/code><\/pre>\n<p>\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ LocalDateTime<\/span>\r\n<span class=\"kt\">boolean<\/span> <span class=\"n\">localAfterFlag<\/span> <span class=\"o\">=<\/span> <span class=\"n\">localNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">isAfter<\/span><span class=\"o\">(<\/span><span class=\"n\">localDt1<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ ZonedDateTime<\/span>\r\n<span class=\"kt\">boolean<\/span> <span class=\"n\">zonedAfterFlag<\/span> <span class=\"o\">=<\/span> <span class=\"n\">zonedNextDay<\/span><span class=\"o\">.<\/span><span class=\"na\">isAfter<\/span><span class=\"o\">(<\/span><span class=\"n\">zonedDt1<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h1>\u8bf7\u53c2\u8003<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Java\u65e5\u4ed8\u51e6\u7406\u30e1\u30e2(Hishidama&#8217;s Java Date Memo) http:\/\/www.ne.jp\/asahi\/hishidama\/home\/tech\/java\/date.html<\/ul>\n<\/li>\n<\/ul>\n<p>\u65e5\u6642\u306b\u95a2\u3059\u308b\u60c5\u5831\u3092\u53d6\u5f97\u3059\u308b(get) &#8211; Calendar\u30af\u30e9\u30b9 http:\/\/www.javadrive.jp\/start\/calendar\/index2.html<\/p>\n<p>Java\u65e5\u4ed8\u6642\u523bAPI\u30e1\u30e2(Hishidama&#8217;s Java8 Date and Time API Memo) http:\/\/www.ne.jp\/asahi\/hishidama\/home\/tech\/java\/datetime.html<\/p>\n<p>Java\u65e5\u4ed8\u6642\u523b\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u30fc\u30e1\u30e2(Hishidama&#8217;s Java8 DateTimeFormatter Memo) http:\/\/www.ne.jp\/asahi\/hishidama\/home\/tech\/java\/DateTimeFormatter.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java8\u4e2d\uff0c\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684\u7c7b\u96c6\u53d1\u751f\u4e86\u5de8\u5927\u7684\u6539\u53d8\u3002\u501f\u6b64\u673a\u4f1a\uff0c\u6211\u60f3\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u7684\u5904\u7406\u65b9\u6cd5\u6574\u7406\u4e00\u4e0b\u3002\u4e0a\u4e00\u6b21\u6211\u8bb2 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30987","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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