public function __construct( $_field ) {

		$_field = wp_parse_args(
			$_field,
			array(
				'date_format' => 'mm/dd/yy', // jQuery datepicker formats (http://api.jqueryui.com/datepicker/#utility-formatDate).
				'date_max'    => '',
				'date_min'    => '',
			)
		);

		$this->field = $_field;

	}