TO change date format in DB2

Hi Everyone ,

Need help !!!

"I want to change the date format in DB2"
I am doing
db2 "select max(MONTH_LAST_DATE) from table_name"
Out is "09/30/2012"
I want to convert into "30-SEP-2012" format.

Also, I want to subtract " ( 30-SEP-2012 ) - 6 month "

Thanks in advance...