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Java 实现两个日期之间相差多少天

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author zfy
 * @version 1.0
 * @date 2022/12/22 18:43
 * @Description:
 */
public class DateUtils {
    public static void main(String[] args) throws ParseException {
        String date1str = "2021/02/22";
        String date2str = "2021/02/22";
        int dayNum = daysBetween(date1str, date2str);
        System.out.println(dayNum);
    }


    /**
     * JAVA计算两个日期相差多少天
     * @param date1str
     * @param date2str
     * @return
     */
    public static int daysBetween(String date1str,String date2str) throws ParseException {
        int count = 0;
        if("".equals(date1str) || date1str == null || "".equals(date2str) || date2str == null) {
            return count;
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
        Date date1 = format.parse(date1str);
        Date date2 = format.parse(date2str);
        count = Math.abs((int) ((date1.getTime() - date2.getTime()) / (1000*3600*24)));
        return count;
    }

}

运行结果：