diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index b377f0656f..c1f156038d 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -180,10 +180,10 @@ struct Date
 static const Date testDates[] =
 {
     {  1, wxDateTime::Jan,  1970, 00, 00, 00, 2440587.5, wxDateTime::Thu,         0 },
-    {  7, wxDateTime::Feb,  2036, 00, 00, 00, 2464730.5, wxDateTime::Thu,        -1 },
-    {  8, wxDateTime::Feb,  2036, 00, 00, 00, 2464731.5, wxDateTime::Fri,        -1 },
-    {  1, wxDateTime::Jan,  2037, 00, 00, 00, 2465059.5, wxDateTime::Thu,        -1 },
-    {  1, wxDateTime::Jan,  2038, 00, 00, 00, 2465424.5, wxDateTime::Fri,        -1 },
+    {  7, wxDateTime::Feb,  2036, 00, 00, 00, 2464730.5, wxDateTime::Thu, 2085955200LL },
+    {  8, wxDateTime::Feb,  2036, 00, 00, 00, 2464731.5, wxDateTime::Fri, 2086041600LL },
+    {  1, wxDateTime::Jan,  2037, 00, 00, 00, 2465059.5, wxDateTime::Thu, 2114380800LL },
+    {  1, wxDateTime::Jan,  2038, 00, 00, 00, 2465424.5, wxDateTime::Fri, 2145916800LL },
     {  1, wxDateTime::Jan,  2044, 00, 00, 00, 2467615.5, wxDateTime::Fri, 2335219200LL },
     { 21, wxDateTime::Jan,  2222, 00, 00, 00, 2532648.5, wxDateTime::Mon, 7954070400LL },
     { 29, wxDateTime::May,  1976, 12, 00, 00, 2442928.0, wxDateTime::Sat, 202219200 },