[GENERAL] Substring Problem

Hi there,

it seems to work with 8.1, but not anymore with 8.3. What is wrong with this substring request? Or is it some installation issue? Thanks for any suggestion!

SELECT substring(date from 1 for 7) AS stryearmonth, COUNT(id) AS countofnumber FROM (SELECT * from downloads ) AS foo GROUP BY stryearmonth ORDER BY stryearmonth ASC

It says:

ERROR:  function pg_catalog.substring(date, integer, integer) does not exist LINE 1: SELECT substring(date from 1 for 7) as stryearmonth, COUNT(i...