package com.founder.util;

 import java.text.SimpleDateFormat;

 import java.util.ArrayList;

 import java.util.Calendar;

 import java.util.Date;

 import java.util.List;

 /**

  * TODO

  *

  * @ClassName: Time

  * @author: dh

  * @since: 2019/9/25 15:32

  */

 public class Time {

     /**

      * 返回两个时间间隔内的所有日期

      *

      * @param dateStart eg：2017-1-1

      * @param dateEnd   eg:2019-9-25

      * @return java.util.List<java.lang.String>

      * @Title: getTwoDaysDay

      */

     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(dateOne);

             dateList.add(sdf.format(dateOne));

             while (calendar.getTime().before(dateTwo)) {

                 calendar.add(Calendar.DAY_OF_MONTH, +1);

                 dateList.add(sdf.format(calendar.getTime()));

             }

         } catch (Exception e) {

             e.printStackTrace();

         }

         return dateList;

     }

 }

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;

    }

}