这是我程序中用到的方法，传入的日期格式，可根据本身的须要做相应的改变。java

/**

* 读取两个日期之间的天数

* @param begin yyyy-mm-dd

* @param end yyyymmdd

* @return

*/

public static int getDays(Date begin,String end) throws Exception{

String strend=end.substring(0,4)+"-"+end.substring(4,6)+"-"+end.substring(6,8);

int days=getBetweenDays(begin.toString(), strend);

return days;

}

/**

* 取得两个时间段的时间间隔

* return t2 与t1的间隔天数

* throws ParseException 若是输入的日期格式不是0000-00-00 格式抛出异常

*/

public static int getBetweenDays(String t1,String t2) throws ParseException{

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

int betweenDays = 0;

Date d1 = format.parse(t1);

Date d2 = format.parse(t2);

Calendar c1 = Calendar.getInstance();

Calendar c2 = Calendar.getInstance();

c1.setTime(d1);

c2.setTime(d2);

// 保证第二个时间必定大于第一个时间

if(c1.after(c2)){

c1 = c2;

c2.setTime(d1);

}

int betweenYears = c2.get(Calendar.YEAR)-c1.get(Calendar.YEAR);

betweenDays = c2.get(Calendar.DAY_OF_YEAR)-c1.get(Calendar.DAY_OF_YEAR);

for(int i=0;i

int tmp=countDays(c1.get(Calendar.YEAR));

betweenDays+=countDays(c1.get(Calendar.YEAR));

c1.set(Calendar.YEAR,(c1.get(Calendar.YEAR)+1));

}

return betweenDays;

}

public static int countDays(int year){

int n=0;

for (int i = 1; i <= 12; i++) {

n += countDays(i,year);

}

return n;

}

public static int countDays(int month, int year){

int count = -1;

switch(month){

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

count = 31;

break;

case 4:

case 6:

case 9:

case 11:

count = 30;

break;

case 2:

if(year % 4 == 0)

count = 29;

else

count = 28;

if((year % 100 ==0) & (year % 400 != 0))

count = 28;

}

return count;

}