ORACLE implements time recursion

select to_char(to_date(20160901, 'YYYYMMDD') + level - 1, 'yyyy-MM-DD') as producetime
  from dual
connect by level <=
           (trunc(sysdate) - trunc(to_date(20160901, 'YYYYMMDD')) + 1);

The connect by clause defines the interconnectedness of the data in the table. The
level indicates the query depth (the above level indicates the number of days for the query)