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public static void main(String[] args) {

        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

         try {

                Date startDate = dateFormat.parse("2024-03-01 10:00:00");//开始时间

                Date endDate = dateFormat.parse("2024-03-02 14:00:00");//结束时间

                long msNum = endDate.getTime()-startDate.getTime();//时间戳相差的毫秒数

                long dayNum = msNum/(24*60*60*1000)//除以一天的毫秒数，得到相差天数

                System.out.println("相差天数为："+ dayNum);

         } catch (ParseException e) {

                e.printStackTrace();

         }

}

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public static void main(String[] args) {

        DateFormat dft = new SimpleDateFormat("yyyy-MM-dd");

        try {

            Date star = dft.parse("2020-02-03");//开始时间

            Date endDay=dft.parse("2025-03-02");//结束时间

            Date nextDay=star;

            int i=0;

            while(nextDay.before(endDay)){//当明天不在结束时间之前是终止循环

                Calendar cld = Calendar.getInstance();

                cld.setTime(star);

                cld.add(Calendar.DATE, 1);

                star = cld.getTime();

                //获得下一天日期字符串

                nextDay = star;

                i++;

            }

           System.out.println("相差天数为："+i);

        } catch (ParseException e) {

            e.printStackTrace();

        }

    }

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public static void main(String[] args) {

        String star="2020-02-03";

        String end="2025-03-02";

        String[] star1=star.split("-");

        String[] end1=end.split("-");

        int days=0;

        if(Integer.parseInt(star1[0])<Integer.parseInt(end1[0])){

            for(int i=Integer.parseInt(star1[0]);i<Integer.parseInt(end1[0]);i++){

                //计算是否是瑞年

                if(i%4==0&&i%100!=0||i%400==0){

                    days+=366;

                }else{

                    days+=365;

                }

            }

        }

        //得到开始那一年已过去的日期

        int starday=days(star1[0],star1[1],star1[2]);

        //得到结束那一年已过去的日期

        int endday=days(end1[0],end1[1],end1[2]);

        //减去开始那一年已过去的日期，加上结束那一年已过去的日期

        days=days-starday+endday;

        System.out.println("相差的天数："+days);

    }

    public static int days(String year,String month,String day){

        int days=0;

        int nowyear=Integer.parseInt(year);

        int[] monthday={0,31,28,31,30,31,30,31,31,30,31,30,31};

        int[] monthday1={0,31,29,31,30,31,30,31,31,30,31,30,31};

        boolean flag=true;

        if(nowyear%4==0&&nowyear%100!=0||nowyear%400==0){

        }else{

            flag=false;

        }

        for(int i=0;i<Integer.parseInt(month);i++){

            if(flag){

                days+=monthday1[i];

            }else{

                days+=monthday[i];

            }

        }

        days+=Integer.parseInt(day);

        return days;

    }

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int y;

    int m;

    int d;

    public test2(int y,int m,int d ){

        this.y=y;

        this.m=m;

        this.d=d;

    }

    public int sum(test2 d){

        int day=0;

        int[] x={0,31,28,31,30,31,30,31,31,30,31,30,31};

        for(int i=1;i<d.y;i++){

            if(i%4==0&& i%100!=0 || i%400==0){

                day+=366;

            }else{

                day+=365;

            }

        }

        if(d.y%4==0&& d.y%100!=0 || d.y%400==0){

            x[2]=29;

        }

        for(int i=1;i<d.m;i++){

            day+=x[i]; 

        }

        day+=d.d;

        System.out.println(day);

        return day;

    }

    public int DiffDays(test2 d){//计算两个日期之间的相距天数的成员方法

        int s1=sum(this);

        int s2=sum(d);

        if(s1>s2){

            return s1-s2;

        }else{

            return s2-s1;

        }

    }

    public static void main(String args[]){

        int a,b,c;

        test2 d1,d2;

        try{

            d1=new test2(2020,02,03);

            d2=new test2(2025,03,02);

            System.out.println("相差的天数:"+d1.DiffDays(d2));

        }catch(Exception e){

            System.out.println("error");

        }

    }

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public int checkWeekendDay(int startDate, int endDate, int days){

        int weekEndCount = 0;

        if (days<1){

            if (startDate==6 || startDate==0){

                weekEndCount+=1;

            }

        } else {

            weekEndCount+=(days/7)*2;

            weekEndCount+=calculateWeekendDays(startDate,endDate);

        }

        return weekEndCount;

    }

public int calculateWeekendDays(int startDate, int endDate){

        int weekendCount=0;

        if (startDate==0&&endDate==6) {

            weekendCount += 2;

        }else if (startDate<endDate&&endDate==6){

            weekendCount+=1;

        }else if (startDate<endDate&&startDate==0){

            weekendCount+=1;

        }else if (startDate>endDate){

            weekendCount+=2;

        }

        if (startDate==endDate){

            if (startDate==6||endDate==0){

                weekendCount+=1;

            }

        }

        return weekendCount;

    }