用老师的项目，为啥还是会报错？格式化问题已改啊？
org.apache.jasper.JasperException: An exception occurred processing JSP page /userinfo.jsp at line 64
61: <td class="content">
62: <%
63: SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
64: String date = sdf.format(regUser.getBirthday());
65:
66: %>
67: <%=date%>
