text: /**
   * A Column definition class which renders a passed date according to the default locale, or a configured
   * {@link #format}.
   *
   *     @example
   *     var store = Ext.create('Ext.data.Store', {
   *         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.Grid', {
   *         title: 'Date Column Demo',
   *         store: store,
   *         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
   *     });
   */
  Ext.define('Ext.grid.column.Date', {
      extend: 'Ext.grid.column.Column',
  
      requires: [
          'Ext.Date',
          'Ext.grid.cell.Date'
      ],
  
      xtype: 'datecolumn',
  
      config: {
          /**
           * @cfg {String} format (required)
           * A format string as used by {@link Ext.Date#format} to format values for this
           * column.
           */
          format: null,
  
          cell: {
              xtype: 'datecell'
          }
      }
  });
  