使用java.util.Calendar返回间隔天数

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

使用SimpleDateFormat,规定好格式,parser出错即为非法

/**

* Calculates the number of days between two calendar days in a manner

* which is independent of the Calendar type used.

*

* @param d1 The first date.

* @param d2 The second date.

*

* @return The number of days between the two dates. Zero is

* returned if the dates are the same, one if the dates are

* adjacent, etc. The order of the dates

* does not matter, the value returned is always >= 0.

* If Calendar types of d1 and d2

* are different, the result may not be accurate.

*/

static int getDaysBetween (java.util.Calendar d1, java.util.Calendar d2) {

if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end

java.util.Calendar swap = d1;

d1 = d2;

d2 = swap;

}

int days = d2.get(java.util.Calendar.DAY_OF_YEAR) -

d1.get(java.util.Calendar.DAY_OF_YEAR);

int y2 = d2.get(java.util.Calendar.YEAR);

if (d1.get(java.util.Calendar.YEAR) != y2) {

d1 = (java.util.Calendar) d1.clone();

do {

days += d1.getActualMaximum(java.util.Calendar.DAY_OF_YEAR);

d1.add(java.util.Calendar.YEAR, 1);

} while (d1.get(java.util.Calendar.YEAR) != y2);

}

return days;

}

 
 
 
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