Set locale in gtasks api utilities test

astrid/src/test/java/com/todoroo/andlib/utility/DateUtilitiesTest.java

@@ -37,7 +37,7 @@ import static org.tasks.date.DateTimeUtils.newDate;
 @RunWith(RobolectricTestRunner.class)
 public class DateUtilitiesTest {
 
-    private static Locale defaultLocale;
+    private Locale defaultLocale;
 
     @Before
     public void before() {

astrid/src/test/java/com/todoroo/astrid/gtasks/api/GtasksApiUtilitiesTest.java

@@ -8,6 +8,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
 
+import java.util.Locale;
 import java.util.TimeZone;
 
 import static com.todoroo.astrid.gtasks.api.GtasksApiUtilities.gtasksCompletedTimeToUnixTime;
@@ -20,16 +21,19 @@ import static org.junit.Assert.assertNull;
 @RunWith(RobolectricTestRunner.class)
 public class GtasksApiUtilitiesTest {
 
-    private static final DateTimeZone defaultTimeZone = DateTimeZone.getDefault();
+    private static final Locale defaultLocale = Locale.getDefault();
+    private static final DateTimeZone defaultDateTimeZone = DateTimeZone.getDefault();
 
     @Before
     public void before() {
+        Locale.setDefault(Locale.US);
         DateTimeZone.setDefault(DateTimeZone.forID("America/Chicago"));
     }
 
     @After
     public void after() {
-        DateTimeZone.setDefault(defaultTimeZone);
+        Locale.setDefault(defaultLocale);
+        DateTimeZone.setDefault(defaultDateTimeZone);
     }
 
     @Test