Java 判断某个时间是否在条件时间之内

﹏ヽ暗。殇╰゛Y 2022-06-06 07:06 283阅读 0赞

### 判断某个时间是否是在条件时间的n天之内 ###

正数表示在条件时间n天之后，负数表示在条件时间n天之前

/** * 判断time是否在now的n天之内 * @param time * @param now * @param n 正数表示在条件时间n天之后，负数表示在条件时间n天之前 * @return */
        public static boolean belongDate(Date time, Date now, int n) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Calendar calendar = Calendar.getInstance();  //得到日历
            calendar.setTime(now);//把当前时间赋给日历
            calendar.add(Calendar.DAY_OF_MONTH, n);
            Date before7days = calendar.getTime();   //得到n前的时间
            if (before7days.getTime() < time.getTime()) {
                return true;
            } else {
                return false;
            }
        }
           //打印测试
            Date time  = stringToDate("2017-3-13");//string转为date
            Date now = new Date();//直接new对象，获取的是当前时间2017-3-16
            System.out.println(belongDate(time,now,-2));//2天前
            System.out.println(belongDate(time,now,2));//2天后
            System.out.println(belongDate(time,now,-6));//6天前
       
        
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![这里写图片描述][SouthEast]

### 判断某个时间是否是在条件的起始时间与结束时间之内 ###

/** * 判断time是否在from，to之内 * * @param time 指定日期 * @param from 开始日期 * @param to 结束日期 * @return */
        public static boolean belongCalendar(Date time, Date from, Date to) {
            Calendar date = Calendar.getInstance();
            date.setTime(time);
    
            Calendar after = Calendar.getInstance();
            after.setTime(from);
    
            Calendar before = Calendar.getInstance();
            before.setTime(to);
    
            if (date.after(after) && date.before(before)) {
                return true;
            } else {
                return false;
            }
        }
            //打印测试
            Date time1  = stringToDate("2017-3-11");
            Date time2 = stringToDate("2017-3-15");
            Date time3 = stringToDate("2017-3-17");
            Date from = stringToDate("2017-3-12");
            Date to= stringToDate("2017-3-16");
            System.out.println(belongCalendar(time1,from,to));
            System.out.println(belongCalendar(time2,from,to));
            System.out.println(belongCalendar(time3,from,to)); 
       
        
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![这里写图片描述][SouthEast 1]

### 判断给定时间与当前时间相差多少天 ###

public static long getDistanceDays(String date) {
            DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    
            long days = 0;
            try {
                Date time = df.parse(date);//String转Date
                Date now = new Date();//获取当前时间
                long time1 = time.getTime();
                long time2 = now.getTime();
                long diff = time1 - time2;
                days = diff / (1000 * 60 * 60 * 24);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return days;//正数表示在当前时间之后，负数表示在当前时间之前
        }
       
        
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### PS ###

以上方法涉及到的string转为date等时间日期转换问题。  
欢迎查看我的以下两篇博客：  
1。Java Calendar日历与Date日期的相互转：  
[http://blog.csdn.net/demonliuhui/article/details/62423646][http_blog.csdn.net_demonliuhui_article_details_62423646]  
2。 Java Date与String的相互转换：  
[http://blog.csdn.net/demonliuhui/article/details/62423158][http_blog.csdn.net_demonliuhui_article_details_62423158]

[SouthEast]: /images/20220606/f5f103408b6f4b309d272587e3b5ebaa.png
[SouthEast 1]: /images/20220606/faa4ab550c00464dbcc818d3dcffa588.png
[http_blog.csdn.net_demonliuhui_article_details_62423646]: http://blog.csdn.net/demonliuhui/article/details/62423646
[http_blog.csdn.net_demonliuhui_article_details_62423158]: http://blog.csdn.net/demonliuhui/article/details/62423158