JDK8 时间相关API基本使用

package com.atguigu.date;

import java.time.Clock;
import java.time.DayOfWeek;
import java.time.Duration;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.MonthDay;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAdjusters;
import java.util.Set;

import org.junit.Test;

public class TestDate {
    @Test
    public void testDateTimeFormatter(){
        DateTimeFormatter df = DateTimeFormatter.ISO_DATE;
        LocalDate date = LocalDate.now();
        System.out.println(df.format(date));
        System.out.println(date.format(df));
        
        DateTimeFormatter of = DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL);//只有日期类型才可以使用FULL
        System.out.println(of.format(LocalDate.now()));
        
        //日期时间不可以使用FULL
        DateTimeFormatter dtf = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG);
        System.out.println(dtf.format(LocalDateTime.now()));//2017年8月14日 下午08时47分15秒
    
        DateTimeFormatter op = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        System.out.println(op.format(LocalDateTime.now()));
    }
    @Test
    public void testTemporalAdjuster(){
        LocalDate now = LocalDate.now();//2017-8-26
        TemporalAdjuster t = TemporalAdjusters.next(DayOfWeek.SUNDAY);
        LocalDate nd = now.with(t);//最近的那个星期天
        System.out.println(nd);
        
        
    }
    
    @Test
    public void testPeriod(){
        Period p = Period.between(LocalDate.of(2016, 1, 1), LocalDate.now());
        System.out.println(p);//P7M13D
        
        System.out.println(p.getYears());//1年
        System.out.println(p.getMonths());//又7个月
        System.out.println(p.getDays());//零25天
        System.out.println(p.toTotalMonths());//总共19个月
        
    }
    @Test
    public void testDuration(){
        Duration dur = Duration.between( Instant.ofEpochMilli(Integer.MAX_VALUE),Instant.now());
        System.out.println(dur);
        
        System.out.println(dur.toDays());
        System.out.println(dur.toHours());
        System.out.println(dur.toMinutes());
        System.out.println(dur.toMillis());
        System.out.println(dur.toNanos());
        
        System.out.println(dur.getSeconds());
        System.out.println(dur.getNano());
    }
    
    
    @Test
    public void testInstant(){
        Instant now = Instant.now();
        System.out.println(now);
        
    }
    
    @Test
    public void testLocalDate2(){
        LocalDate t1 = LocalDate.now();//只有日期
        
        System.out.println(t1.plusDays(45));//45天以后是什么日期  2017-10-10
        System.out.println(t1.minusDays(20));
        System.out.println(t1.plusWeeks(2));
        
        System.out.println(t1.with(TemporalAdjusters.firstDayOfMonth()));
        System.out.println(t1.with(TemporalAdjusters.lastDayOfMonth()));
        
        System.out.println(t1.isLeapYear());
        
        MonthDay month = MonthDay.of(8, 14);
        MonthDay from = MonthDay.from(t1);
        System.out.println("是否是你的生日："+month.equals(from));
    }
    
    @Test
    public void testLocalDate(){
        LocalDate t1 = LocalDate.now();//只有日期
        System.out.println(t1);
        
        System.out.println("年："+t1.getYear());
        System.out.println("月："+t1.getMonth());
        System.out.println("日："+t1.getDayOfMonth());
        System.out.println("星期："+t1.getDayOfWeek());
        
        LocalTime t2 = LocalTime.now();//只有时间
        System.out.println(t2);
        System.out.println("时：" + t2.getHour());
        System.out.println("分：" + t2.getMinute());
        System.out.println("秒：" + t2.getSecond());
        System.out.println("纳秒：" +t2.getNano());
        
        System.out.println(t2.plusHours(12));
        
        LocalDateTime t3 = LocalDateTime.now();//有日期和时间
        System.out.println(t3);
    }
    
    @Test
    public void test(){
        ZonedDateTime now = ZonedDateTime.now();
        System.out.println(now);
        
        Clock c = Clock.system(ZoneId.of("America/New_York"));
        ZonedDateTime now2 = ZonedDateTime.now(c);
        System.out.println(now2);
        
        Clock c3 = Clock.system(ZoneId.of("Asia/Tokyo"));
        ZonedDateTime now3 = ZonedDateTime.now(c3);
        System.out.println(now3);
        
        
    }
    
    @Test
    public void testClock(){
/*        Clock clock = Clock.systemDefaultZone();
        System.out.println(clock);
        System.out.println(clock.millis());
        
        Clock c = Clock.system(ZoneId.of("America/New_York"));
        System.out.println(c);
        System.out.println(c.millis());*/
        
        Set<String> availableZoneIds = ZoneId.getAvailableZoneIds();
        for (String string : availableZoneIds) {
            System.out.println(string);
        }
    }
}