diff --git a/enabler/src/de/schildbach/pte/AbstractEfaProvider.java b/enabler/src/de/schildbach/pte/AbstractEfaProvider.java
index 10228242..28a00cdd 100644
--- a/enabler/src/de/schildbach/pte/AbstractEfaProvider.java
+++ b/enabler/src/de/schildbach/pte/AbstractEfaProvider.java
@@ -1664,8 +1664,8 @@ public abstract class AbstractEfaProvider extends AbstractNetworkProvider
 	protected String xsltTripRequest2Uri(final Location from, final Location via, final Location to, final Date date, final boolean dep,
 			final int numConnections, final String products, final WalkSpeed walkSpeed, final Accessibility accessibility, final Set<Option> options)
 	{
-		final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMdd");
-		final DateFormat TIME_FORMAT = new SimpleDateFormat("HHmm");
+		final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMdd", Locale.US);
+		final DateFormat TIME_FORMAT = new SimpleDateFormat("HHmm", Locale.US);
 
 		final StringBuilder uri = new StringBuilder(tripEndpoint);
 		appendCommonRequestParams(uri, "XML");
diff --git a/enabler/src/de/schildbach/pte/dto/Connection.java b/enabler/src/de/schildbach/pte/dto/Connection.java
index 3be62466..e6a142a9 100644
--- a/enabler/src/de/schildbach/pte/dto/Connection.java
+++ b/enabler/src/de/schildbach/pte/dto/Connection.java
@@ -21,6 +21,7 @@ import java.io.Serializable;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 /**
  * @author Andreas Schildbach
@@ -170,7 +171,7 @@ public final class Connection implements Serializable
 	@Override
 	public String toString()
 	{
-		final SimpleDateFormat FORMAT = new SimpleDateFormat("E HH:mm");
+		final SimpleDateFormat FORMAT = new SimpleDateFormat("E HH:mm", Locale.US);
 
 		final StringBuilder str = new StringBuilder(getId());
 		str.append(' ');
diff --git a/enabler/src/de/schildbach/pte/dto/GetConnectionDetailsResult.java b/enabler/src/de/schildbach/pte/dto/GetConnectionDetailsResult.java
index d81765e6..6f18d041 100644
--- a/enabler/src/de/schildbach/pte/dto/GetConnectionDetailsResult.java
+++ b/enabler/src/de/schildbach/pte/dto/GetConnectionDetailsResult.java
@@ -20,6 +20,7 @@ package de.schildbach.pte.dto;
 import java.io.Serializable;
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 
 /**
  * @author Andreas Schildbach
@@ -38,7 +39,7 @@ public final class GetConnectionDetailsResult implements Serializable
 	@Override
 	public String toString()
 	{
-		final SimpleDateFormat FORMAT = new SimpleDateFormat("EE dd.MM.yy");
+		final SimpleDateFormat FORMAT = new SimpleDateFormat("EE dd.MM.yy", Locale.US);
 		return FORMAT.format(currentDate) + "|" + connection.toString();
 	}
 }
diff --git a/enabler/test/de/schildbach/pte/util/Iso8601Format.java b/enabler/test/de/schildbach/pte/util/Iso8601Format.java
index b0cac395..eaa9b4b8 100644
--- a/enabler/test/de/schildbach/pte/util/Iso8601Format.java
+++ b/enabler/test/de/schildbach/pte/util/Iso8601Format.java
@@ -21,15 +21,16 @@ import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 
 /**
  * @author Andreas Schildbach
  */
 public class Iso8601Format extends SimpleDateFormat
 {
-	private Iso8601Format(String formatString)
+	private Iso8601Format(final String formatString)
 	{
-		super(formatString);
+		super(formatString, Locale.US);
 	}
 
 	public static DateFormat newTimeFormat()