oracle获取一个时间段内的时间

SELECT TO_CHAR(TO_DATE('2018-01-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss') + ROWNUM - 1, 'yyyy-mm-dd hh24:mi:ss') datelist
FROM DUAL
CONNECT BY ROWNUM <
trunc(to_date('2019-01-01 00:00:00','yyyy-mm-dd hh24:mi:ss') -
to_date('2018-01-01 00:00:00','yyyy-mm-dd hh24:mi:ss')) + 1