diff --git a/scripts-available/CDB_DateToNumber.sql b/scripts-available/CDB_DateToNumber.sql
index 1b9a449..84c3395 100644
--- a/scripts-available/CDB_DateToNumber.sql
+++ b/scripts-available/CDB_DateToNumber.sql
@@ -1,6 +1,6 @@
 -- Convert timestamp to double precision
 --
-CREATE OR REPLACE FUNCTION CDB_DateToNumber(input timestamp)
+CREATE OR REPLACE FUNCTION CDB_DateToNumber(input timestamp with time zone)
 RETURNS double precision AS $$
 DECLARE output double precision;
 BEGIN