diff --git a/src/main/java/it/unibz/inf/isochrone/config/ConfigDataset.java b/src/main/java/it/unibz/inf/isochrone/config/ConfigDataset.java
index 6886a6f35168dc1388b59d3c377c9f6a51777ff4..15f8e83c0d3c6fbe8a2340688319fd61f49c0c85 100644
--- a/src/main/java/it/unibz/inf/isochrone/config/ConfigDataset.java
+++ b/src/main/java/it/unibz/inf/isochrone/config/ConfigDataset.java
@@ -55,7 +55,8 @@ public class ConfigDataset {
 
 		@Override
 		public Calendar transform(final String str) {
-			DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
+			final DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
+
 			Calendar targetTime = Calendar.getInstance();
 			try {
 				targetTime.setTimeInMillis(dateFormat.parse(str).getTime());