java日期计算
Calendar类:一个抽像类，不能直接new 得到。Calendar C = Calendar.getInstance();// 得到当前时间
C.add(C.DATE, 5);//在当前的日期上加上5天
一般可以转化为util包的Date类
java.util.Date temp_date = C.getTime();
这样就可以对日期进行操作了.
代码示例：
[*]public class DateTest {
[*]
[*] public static void main(String[] args) {
[*] Date date = new Date(); // 新建一个日期
[*]
[*] SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // 格式化日期
[*]
[*] String beforeDate = sdf.format(getDateBefore(date, 10));
[*] System.out.println(beforeDate);
[*] String afterDate = sdf.format(getDateAfter(date, 10));
[*] System.out.println(afterDate);
[*] }
[*]
[*] /**
[*] * 得到几天前的时间
[*] */
[*]
[*] public static Date getDateBefore(Date d, int day) {
[*] Calendar now = Calendar.getInstance();
[*] now.setTime(d);
[*] now.set(Calendar.DATE, now.get(Calendar.DATE) - day);
[*] return now.getTime();
[*] }
[*]
[*] /**
[*] * 得到几天后的时间
[*] */
[*]
[*] public static Date getDateAfter(Date d, int day) {
[*] Calendar now = Calendar.getInstance();
[*] now.setTime(d);
[*] now.set(Calendar.DATE, now.get(Calendar.DATE) + day);
[*] return now.getTime();
[*] }
[*]}
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