diff --git a/src/main/java/w2phtml/rdf/DocumentStructure.java b/src/main/java/w2phtml/rdf/DocumentStructure.java
index d0f1c3d..25f085a 100644
--- a/src/main/java/w2phtml/rdf/DocumentStructure.java
+++ b/src/main/java/w2phtml/rdf/DocumentStructure.java
@@ -205,7 +205,7 @@ public class DocumentStructure {
 
   private void addModificationTime(Resource mainResource) {
     Property property = m.createProperty(TS + MODIFICATION_TIME);
-    SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+    SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
     sd.setTimeZone(TimeZone.getTimeZone("GMT"));
     String todayAsString = sd.format(currentTime);
 	  mainResource.addProperty( property, todayAsString);