Convert string to a date

Gurus,
It would be highly appreciable if you could help me in knowing how to convert a string to date in obiee. I know we need to use CAST function. I don't have enough material to figure it out myself.
Awaiting a reply.
Thanks.

Nico - Thanks for the link, this is very helpful. Please tell me what's wrong in the following code. Am enlcosing the code and the error.
Code 1 :
CAST(CAST('31-OCT-'||CAST(YEAR("Dim - MBS Loan"."CLOSING DATE") AS CHAR) AS CHAR) AS DATE)
Error 1:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 17001] Oracle Error code: 25137, message: ORA-25137: Data value out of range at OCI call OCIStmtExecute: select distinct D1.c1 as c1, D1.c2 as c2, D1.c3 as c3,
Code 2 :
CAST('31-OCT-'||SUBSTRING(CAST(YEAR("Dim - MBS Loan"."CLOSING DATE") AS CHAR),3,2) AS DATE)
Error 2:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 17001] Oracle Error code: 1840, message: ORA-01840: input value not long enough for date format at OCI call OCIStmtExecute: select distinct D1.c1 as c1, D1.c2 as

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