Date

package test;

import java.time.LocalDateTime;

//取得当前的日期时间
public class GetDatetime {
    public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.now();
        System.out.println(localDateTime);  //2018-07-27T15:14:09.016
    }
}

package test;
import java.time.LocalDate;
import java.time.MonthDay;
//判断是否闰年
import java.time.Year;
import java.time.YearMonth;

public class LeapYear {
    public static void main(String[] args) {
        Year year = Year.of(2018); //用指定的年获取一个Year
        　　 YearMonth yearMonth = year.atMonth(7); //从Year获取YearMonth
        　　 LocalDate localDate = yearMonth.atDay(27); //YearMonth指定日得到LocalDate
        　　 System.out.println("time = " + localDate);  //time = 2018-07-27
        //判断是否是闰年
        　　 System.out.println("isLeapYear : " + localDate.isLeapYear()); //isLeapYear : false
        //自动处理闰年的2月日期
        //创建一个MonthDay
        　　 MonthDay monthDay = MonthDay.of(2, 29);
        LocalDate localDate2 = monthDay.atYear(2012);  
        System.out.println("leapYear : " + localDate2);  //leapYear : 2012-02-29
        //同一个monthDay关联另一个年份上
        　　 LocalDate nonLeapYear = monthDay.atYear(2014);
        System.out.println("isnotleapyear : " + nonLeapYear); //isnotleapyear : 2014-02-28
    }
}

package test;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class DateFormatDemo {
    public static void main(String[] args) {
        //获取当前时间
        　　 LocalDate localDate = LocalDate.now();
        //指定格式规则
        　　 DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuu-MM-dd");
        //将当前时间格式化
        　　 String str = localDate.format(formatter);
        System.out.println("时间 : " + str);      //时间 : 2018-07-27
    }
}