where is oracle session timezone set? I have a logging table

CREATE TABLE EMAIL_LOGGING
(
  ID               NUMBER(9)                    NOT NULL,
  SEND_DATE        TIMESTAMP(6)                 DEFAULT LOCALTIMESTAMP        NOT NULL,
  SEND_TO_USER_ID  NUMBER(9)                    NOT NULL);


and a package that inserts into it with this fragment:

  INSERT INTO EMAIL_LOGGING ("ID",SEND_DATE, SEND_TO_USER_ID)
       VALUES (NULL, LOCALTIMESTAMP,send_to_user_in);


When this is called from a DBMS_JOB from one package it inserts Greenwich mean time.  When it is called from a DBMS_JOB from another package that uses a db_link to another database it correctly inserts the local time.

I think this is caused by the client's timezone being used but adding this to the job did not resolve it:

execute immediate 'alter session set time_zone=local';


Of course the best solution is to move to DBMS_Scheduler but until that is done how can I ensure that the timestamp that is inserted is the local time?

select * from v$version where banner like 'Oracle%';
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
SELECT DBTIMEZONE FROM DUAL;
+00:00
SELECT SESSIONTIMEZONE from dual;
-04:00
I resolved this issue by setting this attribute

BEGIN
  DBMS_SCHEDULER.set_scheduler_attribute (
    attribute =&gt; 'default_timezone',
    value     =&gt; 'EST');
END;


and moving the job to DBMS_SCHEDULER.  Now, when it runs the correct (local) time is entered in the logging table.