Hi;
I have tried many ways to schdule an a script using sql developer;But for these scripts those are failed.But those can nicely run using built in oracle sql-plus.i can use the script by using @ sign and with the file name (eg : @filename)

Here is a example code;

set serveroutput on size 1000000
set verify off
set linesize 200
set feedback off
set head off
set echo off
set trimspool on
set numformat 999,999,999,999,999,999.99
set timing off

alter session set NLS_DATE_FORMAT='dd-mm-yyyy

set termout on

col date_stp new_value date_stp noprint
select to_char(SYSDATE,'YYYYMMDD-DayHH24-MI-SS') date_stp from dual;

spool 'sum_calculation-&date_stp'

select 'Start Time: ' || to_char(sysdate, 'mm/dd/yyyy hh24:mi:ss') from dual;
exec sum_calculation;
select 'End Time : ' || to_char(sysdate, 'mm/dd/yyyy hh24:mi:ss') from dual;

select EOD_DATE , sum(total_BALANCE) from sum_calculation where to_date(EOD_DATE,'dd-mm-yyyy')=to_date(sysdate-1,'dd-mm-yyyy') group by EOD_DATE order by EOD_DATE;

spool off

SQL> create or replace
  2  procedure sum_calculation is
  3  begin
  4    dbms_output.put_line('Some proc output');
  5  end;
  6  /

Procedure created.