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java 获取两个时间之前所有的日期

正序（2017-01-01 ~2019-xxxxx）

 1 package com.founder.util;
 2 
 3 import java.text.SimpleDateFormat;
 4 import java.util.ArrayList;
 5 import java.util.Calendar;
 6 import java.util.Date;
 7 import java.util.List;
 8 
 9 /**
10  * TODO
11  *
12  * @ClassName: Time
13  * @author: dh
14  * @since: 2019/9/25 15:32
15  */
16 public class Time {
17 
18     /**
19      * 返回两个时间间隔内的所有日期
20      *
21      * @param dateStart eg：2017-1-1
22      * @param dateEnd   eg:2019-9-25
23      * @return java.util.List<java.lang.String>
24      * @Title: getTwoDaysDay
25      */
26 
27     public static List<String> getTwoDaysDay(String dateStart, String dateEnd) {
28         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
29 
30         List<String> dateList = new ArrayList<String>();
31 
32         try {
33             Date dateOne = sdf.parse(dateStart);
34             Date dateTwo = sdf.parse(dateEnd);
35 
36             Calendar calendar = Calendar.getInstance();
37             calendar.setTime(dateOne);
38 
39             dateList.add(sdf.format(dateOne));
40             while (calendar.getTime().before(dateTwo)) {
41                 calendar.add(Calendar.DAY_OF_MONTH, +1);
42                 dateList.add(sdf.format(calendar.getTime()));
43             }
44         } catch (Exception e) {
45             e.printStackTrace();
46         }
47         return dateList;
48     }
49 }

倒序（2019-2-25 ~2017-01-01）：

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

/**
 * TODO
 *
 * @ClassName: test
 * @author: dh
 * @since: 2019/9/25 10:21
 */
public class test {

    public static void main(String[] args) {

        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String format = sdf.format(date);

        System.err.println(getTwoDaysDay("2017-1-1", format));
    }


    public static List<String> getTwoDaysDay(String dateStart, String dateEnd) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        List<String> dateList = new ArrayList<String>();

        try {
            Date dateOne = sdf.parse(dateStart);
            Date dateTwo = sdf.parse(dateEnd);

            Calendar calendar = Calendar.getInstance();
            calendar.setTime(dateTwo);

            dateList.add(dateEnd);
            while (calendar.getTime().after(dateOne)) {
                calendar.add(Calendar.DAY_OF_MONTH, -1);
                dateList.add(sdf.format(calendar.getTime()));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateList;
    }
}