diff --git a/main/tests/server/src/com/google/refine/tests/expr/functions/strings/ToFromConversionTests.java b/main/tests/server/src/com/google/refine/tests/expr/functions/strings/ToFromConversionTests.java
index 9070ee094..e74e025a8 100644
--- a/main/tests/server/src/com/google/refine/tests/expr/functions/strings/ToFromConversionTests.java
+++ b/main/tests/server/src/com/google/refine/tests/expr/functions/strings/ToFromConversionTests.java
@@ -119,7 +119,7 @@ public class ToFromConversionTests extends RefineTest {
       
       String inputDate = "2013-06-01";
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDate)), 
-              "01-Jun-2013");
+              "2013-06-01T00:00:00Z");
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDate), "yyyy-MM-dd"),
               "2013-06-01");
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDate), "yyyy/dd/MM"), "2013/01/06");
@@ -127,7 +127,7 @@ public class ToFromConversionTests extends RefineTest {
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDate), "yyyy-MM-dd hh:mm:ss"), "2013-06-01 12:00:00");
       
       String inputDateTime = "2013-06-01 13:12:11";
-      Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDateTime)), "01-Jun-2013");
+      Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDateTime)), "2013-06-01T13:12:11Z");
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDateTime), "yyyy-MM-dd"), "2013-06-01");
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDateTime), "yyyy-MM-dd hh:mm:ss"),"2013-06-01 01:12:11");
       Assert.assertEquals(invoke("toString", CalendarParser.parseAsOffsetDateTime(inputDateTime), "yyyy-MM-dd HH:mm:ss"),"2013-06-01 13:12:11");