Spooling with dynamic file names

Hi
i'm having a situation where i need to execute a script daily, the logs of the script should be saved using spool. is there a way to dynamically create a destination file with the filename as "spooled_text_"||sysdate
like
spool spooled_text_30_Jan_2008_08_45_AM
Any help is greatly appreicated
Thank you

As follows, in sqlplus...
SQL> column dt new_value file_date
SQL> select to_char(sysdate,'YYYYMMDD') as dt from dual;
DT
20080130
SQL> spool file_name_&file_date..log
SQL> spool off
SQL> host ls
file_name_20080130.log

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