java按天查询 java获取几天后的日期

 

1. /** 
2.      * 得到几天前的时间 
3.      *  
4.      * @param d 
5.      * @param day 
6.      * @return 
7.      */  
8. public static Date getDateBefore(Date d, int day) {  
9.         Calendar now = Calendar.getInstance();  
10.         now.setTime(d);  
11.         now.set(Calendar.DATE, now.get(Calendar.DATE) - day);  
12. return now.getTime();  
13.     }  
14.   
15. /** 
16.      * 得到几天后的时间 
17.      *  
18.      * @param d 
19.      * @param day 
20.      * @return 
21.      */  
22. public static Date getDateAfter(Date d, int day) {  
23.         Calendar now = Calendar.getInstance();  
24.         now.setTime(d);  
25.         now.set(Calendar.DATE, now.get(Calendar.DATE) + day);  
26. return now.getTime();  
27.     }