import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class test16 {

	/**

	 * @param args

	 * @throws ParseException

	 */

	public static void main(String[] args) throws ParseException {

		// TODO Auto-generated method stub

		SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		Date d1=sdf.parse("2012-09-08 10:10:10");

		Date d2=sdf.parse("2012-09-15 00:00:00");

		System.out.println(daysBetween(d1,d2));

		System.out.println(daysBetween("2012-09-08 10:10:10","2012-09-15 00:00:00"));

	}

	/**

     * 计算两个日期之间相差的天数

     * @param smdate 较小的时间

     * @param bdate  较大的时间

     * @return 相差天数

	 * @throws ParseException

     */

    public static int daysBetween(Date smdate,Date bdate) throws ParseException

    {

    	SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

    	smdate=sdf.parse(sdf.format(smdate));

    	bdate=sdf.parse(sdf.format(bdate));

        Calendar cal = Calendar.getInstance();

        cal.setTime(smdate);

        long time1 = cal.getTimeInMillis();

        cal.setTime(bdate);

        long time2 = cal.getTimeInMillis();

        long between_days=(time2-time1)/(1000*3600*24);

       return Integer.parseInt(String.valueOf(between_days));

    }  

/**

*字符串的日期格式的计算

*/

    public static int daysBetween(String smdate,String bdate) throws ParseException{

    	SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

        Calendar cal = Calendar.getInstance();

        cal.setTime(sdf.parse(smdate));

        long time1 = cal.getTimeInMillis();

        cal.setTime(sdf.parse(bdate));

        long time2 = cal.getTimeInMillis();

        long between_days=(time2-time1)/(1000*3600*24);

       return Integer.parseInt(String.valueOf(between_days));

    }

}