Extjs时间显示问题

JSON数据返回的一行的数据如下 :两种情况

(1)

{"comm":0,"empno":7876,"ename":"ADAMS","hiredate":"1998-12-12 08:25:36","job":"CLERK","mgr":7788,"sal":1100}

(2)

{"comm":0,"empno":7876,"ename":"ADAMS","hiredate":{"date":12,"day":6,"hours":8,"minutes":25,"month":11,"nanos":0,"seconds":36,"time":913422336000,"timezoneOffset":-480,"year":98}

JSonReader中读取pubdate属性的设置代码如下:

	var myreader=new Ext.data.JsonReader({	
		idProperty: 'empno',
		root:'data',
		totalProperty: 'total',
		fields: [
		        {name: 'empno'},
		        {name: 'ename'},
	(1)	        {name: 'hiredate',type:'date',dateFormat :'Y-m-d H:i:s'}
	(2)//	        {name: 'hiredate',mapping:'hiredate.time',type:'date',dateFormat:'time'}
	   	 	]	
	});

reader中的dateFormat格式对应从后台传过来点格式。下面在grid中显示列中则可以随便你怎么格式

Grid的columnmodel设置如下：

function formatDate(value){
        return value ? value.dateFormat('Y-m-d') : '';
    }

	            {
//	            	xtype:'datecolumn',
//	            	format:'Y-m-d h:i:s',
	                header   : 'hiredate', 
	                width    : 200, 
	                sortable : true, 
	                dataIndex: 'hiredate',
	                renderer:formatDate,
//	                renderer:Ext.util.Format.dateRenderer('Y-m-d'),
	                editor: new fm.DateField({
//	                    allowBlank: false
	                })
	            }

注释的都是可以随便显示

alert(Ext.util.Format.date(name,'Y-m-d'));