    /**
     * @class Ext.grid.column.Date
     * @extends Ext.grid.column.Column
     *
     * A Column definition class which renders a passed date according to the default locale, or a configured
     * {@link #format}.
     *
     * {@img Ext.grid.column.Date/Ext.grid.column.Date.png Ext.grid.column.Date grid column}
     *
     * ## Code
     *
     *     Ext.create('Ext.data.Store', {
     *         storeId:'sampleStore',
     *         fields:[
     *             {name: 'symbol', type: 'string'},
     *             {name: 'date', type: 'date'},
     *             {name: 'change', type: 'number'},
     *             {name: 'volume', type: 'number'},
     *             {name: 'topday', type: 'date'}
     *         ],
     *         data:[
     *             {symbol:"msft", date:'2011/04/22', change:2.43, volume:61606325, topday:'04/01/2010'},
     *             {symbol:"goog", date:'2011/04/22', change:0.81, volume:3053782, topday:'04/11/2010'},
     *             {symbol:"apple", date:'2011/04/22', change:1.35, volume:24484858, topday:'04/28/2010'},
     *             {symbol:"sencha", date:'2011/04/22', change:8.85, volume:5556351, topday:'04/22/2010'}
     *         ]
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Date Column Demo',
     *         store: Ext.data.StoreManager.lookup('sampleStore'),
     *         columns: [
     *             {text: 'Symbol',  dataIndex: 'symbol', flex: 1},
     *             {text: 'Date',  dataIndex: 'date', xtype: 'datecolumn', format:'Y-m-d'},
     *             {text: 'Change',  dataIndex: 'change', xtype: 'numbercolumn', format:'0.00'},
     *             {text: 'Volume',  dataIndex: 'volume', xtype: 'numbercolumn', format:'0,000'},
     *             {text: 'Top Day',  dataIndex: 'topday', xtype: 'datecolumn', format:'l'}
     *         ],
     *         height: 200,
     *         width: 450,
     *         renderTo: Ext.getBody()
     *     });
     */
    Ext.define('Ext.grid.column.Date', {
        extend: 'Ext.grid.column.Column',
        alias: ['widget.datecolumn'],
        requires: ['Ext.Date'],
        alternateClassName: 'Ext.grid.DateColumn',

        /**
         * @cfg {String} format
         * A formatting string as used by {@link Ext.Date#format} to format a Date for this Column.
         * This defaults to the default date from {@link Ext.Date#defaultFormat} which itself my be overridden
         * in a locale file.
         */
        format : Ext.Date.defaultFormat,

        constructor: function(cfg){
            this.callParent(arguments);
            this.renderer = Ext.util.Format.dateRenderer(this.format);
        }
    });