Java8 Time

LocalDateTime

1. LocalDateTime.now();
   获取当前时间

LocalDateTime ldt = LocalDateTime.now();

输出

2018-06-25T09:43:04.386

2. LocalDateTime.of()
   获取指定的 LocalDateTime 实例

LocalDateTime ldt = LocalDateTime.of(2015, 03,21,22,33,22,33);

3. plus
   增加日期

LocalDateTime ldt = LocalDateTime.now();
LocalDateTime localDateTime = ldt.plusYears(2).plusDays(1);

4. minus
   减日期

LocalDateTime localDateTime = ldt.minusMonths(3).minusHours(3);

5. with
   指定年月日

// 将ldf1 的日指定为3，年指定为2016年
LocalDateTime localDateTime2 = ldf1.withDayOfMonth(3).withYear(2016);

6. Duration.between
   时间之间的间隔

Duration between = Duration.between(ldt1, ldt2);
between.toDays();  // 获取间隔的天数
between.toHours(); // 获取间隔的小时
between.toMillis(); // 获取间隔的秒
between.toMinutes(); // 获取间隔的分钟

7. LocalDateTime 转 String

LocalDateTime now = LocalDateTime.now();
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyyMMdd HH:mm:ss");
String format = dtf.format(now); // 20180625 10:46:25

8. String 转 LocalDateTime

LocalDateTime parse = LocalDateTime.parse(format1, dtf); // 2018-06-25T10:46:25

LocalDate

1. Period.between()
   获取连个日期之间的周期

LocalDate localDate1 = LocalDate.of(2015,05,21);
LocalDate localDate2 = LocalDate.of(2018,06,25);
Period period = Period.between(localDate1, localDate2);
period.getDays();  // 4天
period.getMonths(); // 1个月
period.getYears(); // 3年