diff --git a/app/lint.xml b/app/lint.xml
index b0a42e9f7..6dc64ef81 100644
--- a/app/lint.xml
+++ b/app/lint.xml
@@ -9,6 +9,7 @@
 
     <issue id="ImpliedQuantity" severity="error"/>
     <issue id="DefaultLocale" severity="error"/>
+    <issue id="SimpleDateFormat" severity="error"/>
     <issue id="NewApi" severity="error"/>
     <issue id="InlinedApi" severity="error"/>
 
diff --git a/app/src/full/java/kellinwood/logging/AbstractLogger.java b/app/src/full/java/kellinwood/logging/AbstractLogger.java
index 6a33b46c5..c2c3e4e0c 100644
--- a/app/src/full/java/kellinwood/logging/AbstractLogger.java
+++ b/app/src/full/java/kellinwood/logging/AbstractLogger.java
@@ -18,12 +18,13 @@ package kellinwood.logging;
 
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 
 public abstract class AbstractLogger implements LoggerInterface {
 
     protected String category;
 
-    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
+    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss", Locale.ENGLISH);
 
     public AbstractLogger(String category) {
         this.category = category;
diff --git a/app/src/full/java/kellinwood/zipio/ZipListingHelper.java b/app/src/full/java/kellinwood/zipio/ZipListingHelper.java
index 1f7c74956..41bde0ba7 100644
--- a/app/src/full/java/kellinwood/zipio/ZipListingHelper.java
+++ b/app/src/full/java/kellinwood/zipio/ZipListingHelper.java
@@ -28,7 +28,7 @@ import java.util.Locale;
  */
 public class ZipListingHelper {
 
-    static DateFormat dateFormat = new SimpleDateFormat("MM-dd-yy HH:mm");
+    static DateFormat dateFormat = new SimpleDateFormat("MM-dd-yy HH:mm", Locale.ENGLISH);
 
     public static void listHeader(LoggerInterface log) {
         log.debug(" Length   Method    Size  Ratio   Date   Time   CRC-32    Name");