diff --git a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/DateTimeUtilTests.java b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/DateTimeUtilTests.java
index 1415fa883..87b6faa94 100644
--- a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/DateTimeUtilTests.java
+++ b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/DateTimeUtilTests.java
@@ -1,42 +1,45 @@
 package org.hl7.fhir.utilities;
 
 import ca.uhn.fhir.model.api.TemporalPrecisionEnum;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
 import java.util.Date;
+import java.util.Locale;
 import java.util.TimeZone;
 import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class DateTimeUtilTests {
- 
+
   private static Stream<Arguments> getToHumanDisplayParams() {
-      return Stream.of(
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.YEAR, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MONTH, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.DAY, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-        Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
+    return Stream.of(
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.YEAR, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MONTH, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.DAY, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
+      Arguments.of(TimeZone.getTimeZone("EST"), TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
 
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.YEAR, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MONTH, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.DAY, new Date("2002/02/04"), "dummyValueAsString"),
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-        Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM")
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.YEAR, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MONTH, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.DAY, new Date("2002/02/04"), "dummyValueAsString"),
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
+      Arguments.of(TimeZone.getTimeZone("UTC"), TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM")
 
-      );
+    );
   }
-  
+
   @ParameterizedTest
   @MethodSource("getToHumanDisplayParams")
-  public void testToHumanDisplay(TimeZone theTimeZone, TemporalPrecisionEnum thePrecision, Date theValue, String expected){
-      final String humanDisplay = DateTimeUtil.toHumanDisplay(theTimeZone, thePrecision, theValue, "dummyValueAsString");
-      assertEquals(expected, humanDisplay);
+  public void testToHumanDisplay(TimeZone theTimeZone, TemporalPrecisionEnum thePrecision, Date theValue, String expected) {
+    final String humanDisplay = DateTimeUtil.toHumanDisplay(theTimeZone, thePrecision, theValue, "dummyValueAsString");
+    assertEquals(expected, humanDisplay);
   }
 
   private static Stream<Arguments> getToHumanDisplayLocalTimezoneParams() {
@@ -44,13 +47,25 @@ public class DateTimeUtilTests {
       Arguments.of(TemporalPrecisionEnum.YEAR, new Date("2002/02/04"), "dummyValueAsString"),
       Arguments.of(TemporalPrecisionEnum.MONTH, new Date("2002/02/04"), "dummyValueAsString"),
       Arguments.of(TemporalPrecisionEnum.DAY, new Date("2002/02/04"), "dummyValueAsString"),
-      Arguments.of(TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-      Arguments.of(TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM"),
-      Arguments.of(TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "4-Feb-2002 12:00:00 AM")
+      Arguments.of(TemporalPrecisionEnum.MILLI, new Date("2002/02/04"), "04-Feb-2002 00:00:00"),
+      Arguments.of(TemporalPrecisionEnum.SECOND, new Date("2002/02/04"), "04-Feb-2002 00:00:00"),
+      Arguments.of(TemporalPrecisionEnum.MINUTE, new Date("2002/02/04"), "04-Feb-2002 00:00:00")
 
     );
   }
 
+  private static final Locale defaultLocale = Locale.getDefault();;
+
+  @BeforeAll
+  public static void beforeAll() {
+   Locale.setDefault(Locale.UK);
+  }
+
+  @AfterAll
+  public static void afterAll() {
+    Locale.setDefault(defaultLocale);
+  }
+
   @ParameterizedTest
   @MethodSource("getToHumanDisplayLocalTimezoneParams")
   public void testToHumanDisplayLocalTimezone(TemporalPrecisionEnum thePrecision, Date theValue, String expected){