日期相减的办法

<%
  date1=cdate(year(2006-11-31)&"-"&month(2006-11-31)&"-"&day(2006-11-31))
interval=date()-date1

   if interval>60 then
   response.write"<SCRIPT language=JavaScript>alert('对不起你的查询的合同号过期！');"
         response.write"this.location.href='booking.asp';</SCRIPT>"
   end if%>