You can use the following code to show what dates are in a schedule or a repeat_interval. The procedure prints out dates in a particular schedule or repeat_interval.

<code plsql>
create or replace procedure print_schedule_dates
 (
   schedule in varchar2,
   start_date in timestamp with time zone default dbms_scheduler.stime(),
   number_of_dates in pls_integer default 10
 )
is
  date_after timestamp with time zone := start_date - interval '1' second;
  next_date timestamp with time zone;
begin
  for i in 1 .. number_of_dates
  loop
    dbms_scheduler.evaluate_calendar_string
     (schedule, start_date, date_after, next_date);

    dbms_output.put_line(to_char(next_date,
                    'DY DD-MON-YYYY (DDD-IW) HH24:MI:SS TZH:TZM TZR'));

    date_after := next_date;
  end loop;
end;
/
</code>