Converting value from System.currentTimeMillis() to readable format

hi
i have in database coumn with values that were stored as result of executing System.currentTimeMillis() in java (=“the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC). i need to convert these values to some human readable format.
i am able to get year, month and day from these values(value_date) in format "dd/mm/yyyy" but i need hours, minutes and seconds as well.
select i have for getting years, months and days:
select (
extract (day FROM (to_date('01/01/1970 00:00:00000','mm/dd/yyyy hh24:mi:sssss') + value_date/1000/86400))
|| '/'||
extract (month from (to_date('01/01/1970 00:00:00000','mm/dd/yyyy hh24:mi:sssss') + value_date/1000/86400))
||'/'||
extract (year FROM (to_date('01/01/1970 00:00:00000','mm/dd/yyyy hh24:mi:sssss') + value_date/1000/86400))
FROM some_table;
please advice how to improve this select to get something like "dd/mm/yyyy hh:mm:ss"
thanks

Note that the result with to_char might still not be what you expect (due to timezone and/or DTS):
SQL> CREATE OR REPLACE FUNCTION currenttimemillis
   RETURN NUMBER
IS
   LANGUAGE JAVA
   NAME 'java.lang.System.currentTimeMillis() return java.lang.long';
Function created.
SQL> select to_char(sysdate, 'dd.mm.rrrr hh24:mi:ss') dt,
       to_char(date '1970-01-01' + currentTimeMillis/(1000*24*60*60),'dd.mm.rrrr hh24:mi:ss') dt2
from dual
DT                  DT2
04.06.2009 16:44:09 04.06.2009 14:44:09

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