Query to find concurrent programs ran between certain time

Please find the query to find the concurrent program ran between certain time below.

Please update the time and run the query.

SELECT b.request_id, a.user_concurrent_program_name,
       b.phase_code AS completed, b.status_code AS error,
       u.user_name requestor,
       TO_CHAR (b.actual_start_date, 'MM/DD/YY HH24:MI:SS') starttime,
       TO_CHAR (b.actual_completion_date, 'MM/DD/YY HH24:MI:SS') endtime,
       ROUND ((b.actual_completion_date - b.actual_start_date) * (60 * 24),
              2
             ) runtime,
        convert(b.completion_text,'US7ASCII','WE8ISO8859P1')
  FROM fnd_concurrent_programs_tl a, fnd_concurrent_requests b, fnd_user u
 WHERE a.concurrent_program_id = b.concurrent_program_id
 AND b.requested_by = u.user_id
   AND a.LANGUAGE = 'US'
   AND b.actual_start_date between to_date ('31-MAR-2020 16:00:00' , 'DD_MON_YYYY HH24:MI:SS') and to_date('31-MAR-2020 17:00:00', 'DD_MON_YYYY HH24:MI:SS')  ;