DROP FUNCTION NUM_TO_DATE;
CREATE OR REPLACE function num_to_date(in_number NUMBER) return date isbegin
return(TO_DATE('19700101000000','yyyymmddhh24miss') + in_number/86400000
+ TO_NUMBER(SUBSTR(TZ_OFFSET(sessiontimezone),1,3))/12);
end num_to_date;
注:紅色爲1970年日期,藍色爲數據庫毫秒字段