diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index 1638afe0ba..a530b658ec 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -868,6 +868,10 @@ void DateTimeTestCase::TestTimeFormat()
     CPPUNIT_ASSERT( dt.ParseFormat("12:23:45.000", "%H:%M:%S.%l") );
     CPPUNIT_ASSERT_EQUAL( 0, dt.GetMillisecond() );
 
+    // test another format modifier not testes above.
+    CPPUNIT_ASSERT( dt.ParseFormat("23", "%e") );
+    CPPUNIT_ASSERT_EQUAL( 23, dt.GetDay() );
+
     // test partially specified dates too
     wxDateTime dtDef(26, wxDateTime::Sep, 2008);
     CPPUNIT_ASSERT( dt.ParseFormat("17", "%d", dtDef) );