oracle sqlplus date format

I need to format the poc_date field to be 5/1/13 instead of 20130501

select poc_date, sum(sec_05) sec_05 , sum(sec_1) sec_1, sum(sec_105) sec_105 ,sum(sec_2) sec_2, sum(sec_205) sec_205,
  sum(sec_3) sec_3,sum(sec_305) sec_305, sum(sec_4) sec_4,sum(sec_405)sec_405,sum(sec_5)sec_5,sum(sec_6)sec_6,
  sum(sec_6_plus) sec_6_plus, sum(total_plm_count) total_plms, sum(total_resp_time_sec) total_resp_sec
  from
  (
      SELECT trunc (poc_start_timestamp)poc_date,
      case when RESP_MSEC/plm_cnt/1000 <= 0.5 then plm_cnt else 0 end sec_05,
      case when RESP_MSEC/plm_cnt/1000 > 0.5 and RESP_MSEC/plm_cnt/1000 <= 1 then plm_cnt else 0 end sec_1,
      case when RESP_MSEC/plm_cnt/1000 > 1 and RESP_MSEC/plm_cnt/1000 <= 1.5 then plm_cnt else 0 end sec_105,
      case when RESP_MSEC/plm_cnt/1000 > 1.5 and RESP_MSEC/plm_cnt/1000 <= 2 then plm_cnt else 0 end sec_2,
      case when RESP_MSEC/plm_cnt/1000 > 2 and RESP_MSEC/plm_cnt/1000 <= 2.5 then plm_cnt else 0 end sec_205,
      case when RESP_MSEC/plm_cnt/1000 > 2.5 and RESP_MSEC/plm_cnt/1000 <= 3 then plm_cnt else 0 end sec_3,
      case when RESP_MSEC/plm_cnt/1000 > 3 and RESP_MSEC/plm_cnt/1000 <= 3.5 then plm_cnt else 0 end sec_305,
      case when RESP_MSEC/plm_cnt/1000 > 3.5 and RESP_MSEC/plm_cnt/1000 <= 4 then plm_cnt else 0 end sec_4,
      case when RESP_MSEC/plm_cnt/1000 > 4 and RESP_MSEC/plm_cnt/1000 <= 4.5 then plm_cnt else 0 end sec_405,
      case when RESP_MSEC/plm_cnt/1000 > 4.5 and RESP_MSEC/plm_cnt/1000 <= 5 then plm_cnt else 0 end sec_5,
      case when RESP_MSEC/plm_cnt/1000 > 5 and RESP_MSEC/plm_cnt/1000 <= 6 then plm_cnt else 0 end sec_6,
      case when RESP_MSEC/plm_cnt/1000 > 6 then plm_cnt else 0 end sec_6_plus,
      plm_cnt total_plm_count, resp_msec/plm_cnt/1000 total_resp_time_sec
      FROM poc_STATISTIC
      where poc_start_timestamp >= to_date('1-May-2013','dd-MON-YYYY')
      and poc_start_timestamp < to_date('1-Jun-2013','dd-MON-YYYY')
)
group by poc_date
order by 1

20130501       6040       2496       1987       1221        612        290        141         73         55         40         28         51        13034     11767.3513
20130502       5858       2536       2158       1325        550        287        129         62         57         35         24         50        13071     11946.7767