diff --git a/src/com/android/email/mail/internet/MimeMessage.java b/src/com/android/email/mail/internet/MimeMessage.java
index bf76748da..d032e5256 100644
--- a/src/com/android/email/mail/internet/MimeMessage.java
+++ b/src/com/android/email/mail/internet/MimeMessage.java
@@ -8,6 +8,7 @@ import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 import java.util.Stack;
 
 import org.apache.james.mime4j.BodyDescriptor;
@@ -36,7 +37,7 @@ public class MimeMessage extends Message {
     protected Address[] mBcc;
     protected Address[] mReplyTo;
     protected Date mSentDate;
-    protected SimpleDateFormat mDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z");
+    protected SimpleDateFormat mDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);
     protected Body mBody;
     protected int mSize;
  
diff --git a/src/com/android/email/mail/store/ImapResponseParser.java b/src/com/android/email/mail/store/ImapResponseParser.java
index b631ebf36..5c472281a 100644
--- a/src/com/android/email/mail/store/ImapResponseParser.java
+++ b/src/com/android/email/mail/store/ImapResponseParser.java
@@ -10,6 +10,7 @@ import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
+import java.util.Locale;
 
 import android.util.Config;
 import android.util.Log;
@@ -20,7 +21,7 @@ import com.android.email.PeekableInputStream;
 import com.android.email.mail.MessagingException;
 
 public class ImapResponseParser {
-    SimpleDateFormat mDateTimeFormat = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss Z");
+    SimpleDateFormat mDateTimeFormat = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss Z", Locale.US);
     PeekableInputStream mIn;
     InputStream mActiveLiteral;