select trunc(sysdate, ‘mm‘) + 0 / 24 + 5 / 24 / 60 + 0 / 24 / 60 / 60,
       trunc(sysdate, ‘mm‘)+24,
       sysdate,
       sysdate + 0 / 24 + 1 / 24 / 60 + 0 / 24 / 60 / 60,
       trunc(add_months(sysdate, 1), ‘mm‘) + 0 / 24 + 5 / 24 / 60 + 0 / 24 / 60 / 60,
       trunc(add_months(sysdate, 1), ‘mm‘),
       ADD_MONTHS(to_date(‘2009-2-1 00:05:00‘, ‘yyyy-mm-dd hh24:mi:ss‘),1)
  from dual