JAVA 8 主要新特性 ----------------(七)新時間日期 API -----LocalDateTime

1、LocalDateTime簡介

       

 

2、實戰講解

       

1  LocalDateTime localDateMax = LocalDateTime.MAX;
2         System.out.println("localDateMax年的最大取值範圍 :\n" + localDateMax);
3 
4         LocalDateTime localDateMin = LocalDateTime.MIN;
5         System.out.println("localDateMin年的最小取值範圍 :\n" + localDateMin);

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 1 LocalDateTime localDateTime = LocalDateTime.now();
 2 
 3         System.out.println("localDate獲取當前yyyy-mm-dd :\n" + localDateTime);
 4 
 5         LocalDateTime localDateSystem = LocalDateTime.now(ZoneId.systemDefault());
 6 
 7         System.out.println("當前系統默認時間:\n" + localDateSystem);
 8 
 9         LocalDateTime localDateChinese = LocalDateTime.now(ZoneId.of("GMT+8", new HashMap<>(64)));
10 
11         System.out.println("獲取某個時區的國家當前日期:\n" + localDateChinese);

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1  Clock clock = Clock.systemDefaultZone();
2 
3         LocalDateTime localDateTimeClock = LocalDateTime.now(clock);
4 
5         System.out.println("localDate獲取當前yyyy-mm-dd :\n" + localDateTimeClock);

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         其餘用法：

1 LocalDateTime localDateGet = LocalDateTime.now();
2 
3         System.out.println("localDateGet獲取當前是一年的第幾天 :\n" + localDateGet.getDayOfYear());
4         System.out.println("localDateGet獲取當前是本月的第幾天 :\n" + localDateGet.getDayOfMonth());
5         System.out.println("localDateGet獲取當前星期幾 :\n" + localDateGet.getDayOfWeek());
6         System.out.println("localDateGet獲取當前年 :\n" + localDateGet.getYear());
7         System.out.println("localDateGet獲取當前月 :\n" + localDateGet.getMonth());

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1  LocalDateTime localDateTimeOf = LocalDateTime.of(2018, 12, 05, 11, 12, 12);
2 
3         System.out.println("localDateOf獲取設置的yyyy-mm-dd:\n" + localDateTimeOf);

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1 LocalDateTime localDateOfYearDay = LocalDateTime.ofInstant(Instant.now(), ZoneId.of("UTC+8", new HashMap<>(64)));
2 
3         System.out.println("localDateOfYearDay獲取一年的第352天是哪月哪日的yyyy-mm-dd:\n" + localDateOfYearDay);

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1 LocalDateTime dateFromBase = LocalDateTime.ofEpochSecond(200, 20, ZoneOffset.UTC);
2         System.out.println("1970年的365天后是:\n" + dateFromBase);

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1 LocalDateTime localDateText = LocalDateTime.parse("2018-12-05T11:22:22");
2         System.out.println("localDateText輸出字符串日期 :\n" + localDateText);

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1  LocalDateTime localDateFormat = LocalDateTime.parse("2018-12-05T11:22:22", DateTimeFormatter.ISO_DATE_TIME);
2         System.out.println("localDateFormat格式化日期 :\n" + localDateFormat);

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1  LocalDateTime localDateFormatNow = LocalDateTime.from(ZonedDateTime.now());
2         System.out.println("當前日期是:\n" + localDateFormatNow);

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