Added getTaxPointDate() to ZUGFeRDImporter.java

Added Test

libraryBasic/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java

@@ -329,6 +329,22 @@ public class ZUGFeRDImporter {
 		}
 	}
 
+	/**
+	 * @return the Taxpoint Date
+	 */
+	public String getTaxPointDate() {
+		try {
+			if (getVersion() == 1) {
+				return extractString("//ActualDeliverySupplyChainEvent//OccurrenceDateTime//DateTimeString");
+			} else {
+				return extractString("//ActualDeliverySupplyChainEvent//OccurrenceDateTime//DateTimeString");
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+			return "";
+		}
+	}
+
 	/**
 	 * @return the Invoice ID
 	 */

libraryBasic/src/test/java/org/mustangproject/ZUGFeRD/ZF2Test.java

@@ -212,6 +212,7 @@ public class ZF2Test extends MustangReaderTestCase {
 		assertEquals(zi.getInvoiceCurrencyCode(), "EUR");
 		assertEquals(zi.getIssuerAssignedID(),"");
 		assertEquals(zi.getIssueDate(), "20170509");
+		assertEquals(zi.getTaxPointDate(), "20170507");
 		assertEquals(zi.getBuyerTradePartyID(), "DE999999999");
 		assertEquals(zi.getHolder(), getOwnOrganisationName());
 		assertEquals(zi.getDocumentCode(),"380");