calculatedaysbetweendates.java

一个简单的图书馆的管理系统,该系统主要是针对学校的图书馆而做的

package librarymanagement.common;
/**
 * 获得两个String类型的日期相隔的天数
 * @author 虎兴龙
 *
 */
public class CalculateDaysBetweenDates {
/**
 * 
 * @param date1
 * @param date2
 * @return 返回两个字符串类型日期相隔的天数，后者大于前者怎返回负值
 */
	public static long calculateDaysBetweenDates(String date1,String date2){
		 long days=0;
		 int i1=Integer.parseInt(date1.substring(0, 4));
		 int i2 = Integer.parseInt(date2.substring(0,4));
		 int betweenYear=i2-i1;
		 
		 int m1= Integer.parseInt(date1.substring(5, 7));
		 int m2 = Integer.parseInt(date2.substring(5, 7));
		 int betweenMons = m2-m1;
		 
		 int d1 = Integer.parseInt(date1.substring(8, 10));
		 int d2 = Integer.parseInt(date2.substring(8, 10));
		 int betweenDays = d2-d1;
		 
		 days = betweenYear*365 + betweenMons*30 + betweenDays;
		 return days;
	}
	/*public static void main(String[] args){
		System.out.println(calculateDaysBetweenDates("2009-11-16","2008-12-15"));
	}*/
}