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

public class DiffOfDate
{
  public static void main(String[] args) throws Exception
  {
    System.out.println(diffOfDate("20031028", "20031102"));
  }

  public static long diffOfDate(String begin, String end) throws Exception
  {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");

    Date beginDate = formatter.parse(begin);
    Date endDate = formatter.parse(end);

    long diff = endDate.getTime() - beginDate.getTime();
    long diffDays = diff / (24 * 60 * 60 * 1000);

    return diffDays;
  }
}