Index: libs/date_time/test/gregorian/testdate.cpp
===================================================================
--- libs/date_time/test/gregorian/testdate.cpp	(revision 51061)
+++ libs/date_time/test/gregorian/testdate.cpp	(working copy)
@@ -207,6 +207,11 @@
   check("check positive infinity add - true", d11.is_pos_infinity());
 
   date d12(not_a_date_time);
+  check("2000-01-01 IS less than not_a_date_time!", d1 < d12);
+  check("2000-01-01 is NOT greater than not_a_date_time", !(d1 > d12));
+  check("not_a_date_time is NOT less than 2000-01-01", !(d12 < d1));
+  check("not_a_date_time IS greater than 2000-01-01!", d12 > d1);
+  check("2000-01-01 is NOT equal to not_a_date_time", d1 != d12);
   check("check not a date",                   d12.is_not_a_date());
   check("check infinity compare   ",          d10 != d11);
   check("check infinity compare   ",          d10 < d11);