diff --git a/IfcPlugins/src/org/bimserver/ifc/step/serializer/IfcStepSerializer.java b/IfcPlugins/src/org/bimserver/ifc/step/serializer/IfcStepSerializer.java
index 704db832ce..dc36f4d406 100644
--- a/IfcPlugins/src/org/bimserver/ifc/step/serializer/IfcStepSerializer.java
+++ b/IfcPlugins/src/org/bimserver/ifc/step/serializer/IfcStepSerializer.java
@@ -125,7 +125,7 @@ private void writeFooter(UTF8PrintWriter out) {
 	}
 
 	private void writeHeader(UTF8PrintWriter out) {
-		SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'kk:mm:ss");
+		SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
 		out.println("ISO-10303-21;");
 		out.println("HEADER;");
 		SIfcHeader ifcHeader = getModel().getModelMetaData().getIfcHeader();