"Invalid date supplied for" error - response (5) by Ashwin

Hi, I want to cast the TIMESTAMP '9999-12-31 11:59:59' as timestamp but it says invalid date supplied sel CAST('9999-12-31 23:59:59' as TIMESTAMP) but when i tried this sel CAST('9999-12-31 17:59:59' as TIMESTAMP) it is working till this time only after which it throws invalid timestamp error is there any way i can cast value as timestamp   Thanks in advance Ashwin