declare
job number;
begin
sys.dbms_job.submit(job => job,
what => 'dx_lrbf;',
next_date => to_date('04-04-2013 07:20:00', 'dd-mm-yyyy hh24:mi:ss'),
interval => 'trunc(sysdate)+1+7/24+20/(24*60)');
commit;
end;
/