JAVA比较两个日期的差值天数

package com.anxin.ssk.cache;

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

import org.apache.commons.lang.time.DateUtils;

/**
 * @author: (le.qiao)
 * @e-mail: [e-mail]
 * @myblog: <a href="http://qiaolevip.iteye.com">http://qiaolevip.iteye.com</a>
 * @date: 2014-1-17
 * 
 */
public class C {

	public static void main(String[] args) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		Date today = new Date();
		System.out.println(sdf.format(today));
		Date anotherDate = DateUtils.addDays(today, 21);
		System.out.println(sdf.format(anotherDate));
		System.out.println((int) ((anotherDate.getTime() - today.getTime()) / (1000 * 60 * 60 * 24)));
	}
}


// 2014-01-17
// 2014-02-07
// 21