GridPanel????????????????
????????2010-8-10 ??????????????????2010/8/10?????????????????????????
var column_model = new Ext.grid.ColumnModel([
{header: '??', width: 150,?dataIndex: 'date', xtype:'datecolumn', format:'Y/m/d'}
,...... ]);
Ext.onReady(function(){
var cm = column_model;
....
var grid = new Ext.grid.GridPanel({
ds: ds,
cm: cm,
......

FierFox?????????????IE???????NAN/NAN/NAN?????????????

var column_model = new Ext.grid.ColumnModel([
{header: '??', width: 150,?dataIndex: 'date', renderer: Ext.util.Format.dateRenderer('Y/m/d')}
????????????????

?????????????????