gs['display_date'];
			}
			else {
				$document_display_date = 'invoice_date';	
			}
		} 

		$formatted_value = $this->get_display_date_label( $document_display_date );
		return $formatted_value;
	}

	public function get_display_date_label( $date_string ) {
		
		$date_labels = array(
			'invoice_date'	=> __( 'Invoice Date' , 'woocommerce-pdf-invoices-packing-slips' ),
			'order_date'	=> __( 'Order Date' , 'woocommerce-pdf-invoices-packing-slips' ),
		);
		if( isset( $date_labels[$date_string] ) ) {
			return $date_labels[ $date_string ];	
		} else {
			return '';
		}
		
	}
	
}

endif; // class_exists