diff --git a/database/db_types.anubis b/database/db_types.anubis
index 24d5c50..cd53505 100644
--- a/database/db_types.anubis
+++ b/database/db_types.anubis
@@ -249,6 +249,18 @@ public define String
 .
 
 public define String
+  datetime_not_null
+  (
+    DB_datetime d,
+    String  default
+  )=
+  if d.datetime = "{NULL}" then
+    default
+  else
+    d.datetime
+.
+
+public define String
   to_String
   (
     DB_datetime dt
--
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