求出字符“2013-9-8”与“2013-10-1”相差的天数

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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public class DayCount {
//lday为小日期bday为大时间
public static int daysBetween(String lday,String bday) throws ParseException{
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.setTime(sdf.parse(lday));
long time1 = cal.getTimeInMillis();
cal.setTime(sdf.parse(bday));
long time2 = cal.getTimeInMillis();
//除一天的毫秒数转换成天
long betweenDays=(time2-time1)/(1000*3600*24);

return Integer.parseInt(String.valueOf(betweenDays));
}

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

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1=sdf.parse("2013-09-08 10:10:10");
Date d2=sdf.parse("2013-10-01 00:00:00");
System.out.println(daysBetween("2013-09-08 10:10:10","2013-10-01 00:00:00"));
}
}