diff --git a/site-lisp/db-utils-test.el b/site-lisp/db-utils-test.el
index c8af144..e099906 100644
--- a/site-lisp/db-utils-test.el
+++ b/site-lisp/db-utils-test.el
@@ -13,6 +13,8 @@
   (should (equal (db/ntp-to-time #xdcd2ac0c #x05c6dbac)
                  "2017-05-26T13:28:44.022565583Z"))
   (should (equal (db/ntp-to-time #xbd5927ee #xbc616000)
-                 "2000-08-31T18:52:30.735860824Z")))
+                 "2000-08-31T18:52:30.735860824Z"))
+  (should (equal (db/ntp-to-time #x00000000 #x0000000)
+                 "1900-01-01T00:00:00.000000000Z")))
 
 ;;; db-utils-test.el ends here