Adding timestamp to spool file

set colsep  ','
set term    off
set lines   130
set pages   50000
col objecT_name format a40
col object_type format a40
col owner       format a20
col status      format a15



column filename noprint new_value filename

select 'one_time_cufnd_invalid_objects_'||to_char(sysdate, 'mmddyy_hh24mi')||'.csv' filename
from dual;

spool $HOME/script_output/&&filename

select owner, object_type, objecT_name,   status from dba_objects
where status <> 'VALID'
order by owner, object_type, object_name
/
spool off
quit