oracle毫秒数和日期时间之间的转换

--毫秒数转换为日期时间
select * from oa_dut
SELECT TO_CHAR(1112070645000 / (1000 * 60 * 60 * 24) +
TO_DATE('1970-01-01 08:00:00', 'YYYY-MM-DD HH:MI:SS'), 'YYYY-MM-DD HH:MI:SS') AS CDATE

FROM DUAL;

举例
select to_char(a.noticetime / (1000 * 60 * 60 * 24) +
TO_DATE('1970-01-01 ', 'YYYY-MM-DD '),

'YYYY-MM-DD ') AS time from oa_info_notice a where rownum <=1

--日期时间转换为毫秒数
SELECT TO_NUMBER(TO_DATE('2005-03-29 12:30:45', 'YYYY-MM-DD HH24:MI:SS') -
TO_DATE('1970-01-01 8:0:0', 'YYYY-MM-DD HH24:MI:SS')) * 24 * 60 * 60 * 1000

FROM DUAL;