I applied this plug in .Every thing is workingfine except filter for "date field". I coded as follows
{xtype: 'datecolumn', text: "Note Date", dataIndex: 'NoteDate', align: 'center', sortable: true, filter:{
xtype:'datefield',emptyText : 'Filter for',format: 'Y-m-d', allowBlank: true},
renderer: Ext.util.Format.dateRenderer('Y-m-d')
}

Can u please suggest what needs to do for " date filter " functioanlity