dateoper.java

vb+java实现的图书管理系统

package com.bean.util;

import java.text.SimpleDateFormat;
import java.util.Date;

public class DateOper {
    public int nDaysBetweenTwoDate(String firstString, String secondString) {
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
		Date firstDate = null;
		Date secondDate = null;
		try {
			firstDate = df.parse(firstString);
			secondDate = df.parse(secondString);
		} catch (Exception e) {
			// 日期型字符串格式错误
		}
		int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000));
		return nDay;
	} 
    
//    public static void main(String []arg){
//    	DateOper date=new DateOper();
//    	String firstString="2008-10-10";
//    	String secondString="2008-10-9";
//    	int days=date.nDaysBetweenTwoDate(firstString, secondString);
//    	System.out.println(days);
//    }

}