This Oracle tutorial explains how to use the Oracle/PLSQL SESSIONTIMEZONE function.
The Oracle/PLSQL SESSIONTIMEZONE function returns the current session's time zone as a time zone offset (in the following format: '[+|-]TZH:TZM') or a time zone region name.
SESSIONTIMEZONE
returns the database session time zone.
The syntax for the Oracle/PLSQL SESSIONTIMEZONE function is:
SESSIONTIMEZONE
There are no parameters or arguments for the SESSIONTIMEZONE function.
SQL> select SESSIONTIMEZONE from dual;
SESSIONTIMEZONE
-----------------------------------------
-07:00
SQL>