import java.time.*;

import java.time.format.DateTimeFormatter;

import java.time.temporal.ChronoField;

import java.time.temporal.TemporalAdjusters;

import java.util.Date;

public class Main {

public static void main(String[] args) {

// instant使用

System.out.println("instant使用————————————");

System.out.println(Instant.now().toEpochMilli());

System.out.println(new Date().getTime());

Instant instant = Instant.now();

System.out.println(instant);

System.out.println("**********************");

//LocalDateTime - > long

System.out.println("LocalDateTime -> long使用");

System.out.println(LocalDateTime.now().atZone(Clock.systemDefaultZone().getZone()).toInstant().toEpochMilli());

System.out.println(LocalDateTime.now().toInstant(ZoneOffset.ofHours(8)).toEpochMilli());

System.out.println("**********************");

//long -> LocalDateTime

System.out.println("long -> LocalDateTime使用");

DateTimeFormatter dateTimeFormatter= DateTimeFormatter.ofPattern("YYYY-MM-dd HH:mm:ss");

String st = dateTimeFormatter.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(new Date().getTime()), ZoneId.of("Asia/Shanghai")));

System.out.println(st);

System.out.println("***********************");

//ZonedDateTime

System.out.println(Instant.now().atZone(ZoneId.systemDefault()).toLocalDateTime());

//TemporalField 和 TemporalAdjusters

System.out.println("TemporalField 和 TemporalAdjusters使用");

LocalDateTime localDateTime1 = LocalDateTime.now();

System.out.println(localDateTime1.plusDays(1));

System.out.println(localDateTime1.with(ChronoField.YEAR,2013));

System.out.println(localDateTime1.with(ChronoField.DAY_OF_YEAR,20));

System.out.println(localDateTime1.with(ChronoField.MONTH_OF_YEAR,12));

System.out.println(localDateTime1.with(TemporalAdjusters.firstDayOfMonth()));

System.out.println(localDateTime1.get(ChronoField.YEAR));

System.out.println(localDateTime1.get(ChronoField.MONTH_OF_YEAR));

System.out.println(localDateTime1.get(ChronoField.DAY_OF_YEAR));

System.out.println(localDateTime1.get(ChronoField.HOUR_OF_AMPM));

System.out.println(localDateTime1.minusDays(1));

System.out.println("*************************");

//Date -> String

System.out.println("Date -> String使用");

DateTimeFormatter df= DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss");

String string = df.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(new Date().getTime()),ZoneId.of("Asia/Shanghai")));

System.out.println(string);

}

}

instant使用————————————

1517311132643

1517311132643

2018-01-30T11:18:52.643Z

**********************

LocalDateTime -> long使用

1517311132734

1517311132735

**********************

long -> LocalDateTime使用

2018-01-30 19:18:52

***********************

2018-01-30T19:18:52.743

TemporalField 和 TemporalAdjusters使用

2018-01-31T19:18:52.744

2013-01-30T19:18:52.744

2018-01-20T19:18:52.744

2018-12-30T19:18:52.744

2018-01-01T19:18:52.744

2018

1

30

7

2018-01-29T19:18:52.744

*************************

Date -> String使用

2018-01-30 07:18:52