两个日期相差的天数

import java.text.SimpleDateFormat;
import java.util.Date;
public class TestDate 
{
    public static void main(String[] args) 
    { 
        Date date = new Date(); 
        String num = "2009-6-10"; 
        try{ 
            Date m_endTime = new java.text.SimpleDateFormat("yyyy-MM-dd").parse("2009-6-28"); 
            System.out.println((date.getTime()- m_endTime.getTime())/86400000); 
        }catch(Exception ex){ 
            ex.printStackTrace(); 
        }  
    }
}

oracle数据库
select floor(to_date('20080301','yyyymmdd')-sysdate) from dual;

SQL 2k code<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->
select DATEDIFF(day,getdate(),'2010-6-25')
--363