Java 8 LocalDateTime

1. now

//获取当前时间
LocalDateTime now = LocalDateTime.now();
System.out.println(now);

2. of

 //获取指定时间
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
LocalDateTime of2 = LocalDateTime.of(2019, 11, 06, 14, 30,01);
System.out.println(of);
System.out.println(of2);
//  2019-11-06T14:30:01
//  2019-11-06T14:30:01

3. plus

//时间加上半天
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
LocalDateTime plus = of.plus(1, ChronoUnit.HALF_DAYS);
System.out.println(of);
System.out.println(plus);
// 2019-11-06T14:30:01
// 2019-11-07T02:30:01

3. with

 //设置分钟数
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
LocalDateTime withMinute = of.withMinute(2);
System.out.println(of);
System.out.println(withMinute);
// 2019-11-06T14:30:01
// 2019-11-06T14:02:01

4. adjustInto

//adjustInto与with 等价写法，调整时间
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
LocalDateTime now = LocalDateTime.now();
Temporal temporal = now.adjustInto(of);
LocalDateTime with = of.with(now);
System.out.println(of);
System.out.println(temporal);
System.out.println(with);
//        2019-11-06T14:30:01
//        2019-11-06T16:11:49.547
//        2019-11-06T16:11:49.547

5. from

//转换TemporalAccessor为LocalDateTime
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
LocalDateTime from = of.from(LocalDateTime.now());
System.out.println(of);
System.out.println(from);
//        2019-11-06T14:30:01
//        2019-11-06T16:12:32.591

6. get

//得到LocalDateTime的指定字段的值,这里获取天数
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
int day = of.get(ChronoField.DAY_OF_MONTH);
System.out.println(of);
System.out.println(day);
//        2019-11-06T14:30:01
//        6

7. range

//得返回指定时间字段的范围,这里获取一天的时间范围
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
ValueRange range = of.range(ChronoField.HOUR_OF_DAY);
System.out.println(of);
System.out.println(range);
//        2019-11-06T14:30:01
//        0 - 23

8. until

//返回相差的时间，这里是两个时间相差的分钟数
LocalDateTime of = LocalDateTime.of(2019, Month.NOVEMBER, 06, 14, 30,01);
long until = of.until(LocalDateTime.now(), ChronoUnit.MINUTES);
System.out.println(of);
System.out.println(until);
//        2019-11-06T14:30:01
//        104