Ext.data.Record中的日期格式控制

//创建记录类型
var Record = Ext.data.Record.create([
{name: 'OPTYPE', type: 'string'},
{name: 'ZZBM', type: 'string'},
{name: 'ZZMC', type: 'string'},
{name: 'ZZPX', type: 'string'},
{name: 'KSRQ', type: 'date', dateFormat: 'Y-m-d H:i:s'},
{name: 'JSRQ', type: 'date', dateFormat: 'Y-m-d H:i:s'},
{name: 'ZZBMXS', type: 'string'},
{name: 'CZRBM', type: 'string'},
{name: 'CZRGW', type: 'string'},
{name: 'CZSJ', type: 'date', dateFormat: 'Y-m-d H:i:s'},
{name: 'XGRBM', type: 'string'},
{name: 'XGRGW', type: 'string'},
{name: 'XGSJ', type: 'date', dateFormat: 'Y-m-d H:i:s'}
]);

//创建数据列结构
var cm = new Ext.grid.ColumnModel([
new Ext.grid.RowNumberer(),{
header: "组织编号",
dataIndex: 'ZZBMXS',
width: 60,
editor: new Ext.form.TextField({
allowBlank: false,
blankText: '组织编码不能为空'
})
},{
header: "组织描述",
dataIndex: 'ZZMC',
width: 250,
editor: new Ext.form.TextField({
allowBlank: false,
blankText: '组织编码不能为空'
})
},{
header: "开始时间",
dataIndex: 'KSRQ',
width: 150,
renderer: formatDate,
editor: new Ext.form.DateField({
format: 'Y-m-d H:i:s'
})
},{
header: "失效时间",
dataIndex: 'JSRQ',
width: 150,
renderer: formatDate,
editor: new Ext.form.DateField({
format: 'Y-m-d H:i:s'
})
}

界面显示正常,格式如: 2003-07-09 11:20:30

但通过var name = record.fields.keys[j];
var value = record.get(name);

取值时,日期类型的取值时,格式却为 Sun Dec 14 2003 00:00:00 GMT+0800

如何在取值时直接获得符合时间格式的数据，而不在取出后用formate转换？