Time Zone Conversion with out using function and with out alter

Question

Hi All,
I am able to see 1Hr difference in my date fields of SQL output because in UI (User Interface)  date field was stored in BST format but DB time zone is in GMT format so can any one help me to find a solution for 1 hr difference, here i don't have Privileges to alter DB time zone and i couldn't use function as i have so many SQL's and  can't apply that function manually. SO is there any other option to change the DB time zone with out alter it and with out using function.
Thank you Very Much.

Answer 1

Hi,
you need to set time zone in your session, let's do an example :
alter session set nls_date_format='DD/MM/YYYY HH24:MI:SS';
CREATE TABLE USERA.T
  SDATE       DATE                              DEFAULT sysdate,
  WITHOUT_TZ  TIMESTAMP(6)                      DEFAULT sysdate,
  WITH_TZ     TIMESTAMP(6) WITH TIME ZONE       DEFAULT sysdate,
  WITH_LZ     TIMESTAMP(6) WITH LOCAL TIME ZONE DEFAULT sysdate
insert into USERA.T(sdate) values(sysdate);
  commit;
  select * from USERA.T;
SQL> select * from system.t;
SDATE
WITHOUT_TZ
WITH_TZ
WITH_LZ
26/09/2013 11:04:23
2013-09-26-11.04.23.000000
26/09/13 11:04:23,000000 +00:00
2013-09-26-11.04.23.000000
SQL> alter session set TIME_ZONE ='-7:0';
Session altered.
SQL> select * from system.t;
SDATE
WITHOUT_TZ
WITH_TZ
WITH_LZ
26/09/2013 11:04:23
2013-09-26-11.04.23.000000
26/09/13 11:04:23,000000 +00:00
2013-09-26-04.04.23.000000