add table column date format

public/app/plugins/panel/table/column_options.ts

@@ -41,6 +41,7 @@ export class ColumnOptionsCtrl {
       { text: 'YYYY-MM-DD HH:mm:ss.SSS', value: 'YYYY-MM-DD HH:mm:ss.SSS' },
       { text: 'MM/DD/YY h:mm:ss a', value: 'MM/DD/YY h:mm:ss a' },
       { text: 'MMMM D, YYYY LT', value: 'MMMM D, YYYY LT' },
+      { text: 'YYYY-MM-DD', value: 'YYYY-MM-DD' },
     ];
     this.mappingTypes = [{ text: 'Value to text', value: 1 }, { text: 'Range to text', value: 2 }];