HOW TO FIND OUT THE AVAILABLE TIMEZONES IN ORACLE SQL

BISMILLAHIR RAHMANIR RAHEEM

You can query the dynamic view named  as   v$timezone_names to get the list  of
available timezones .

select *
from v$timezone_names;

This will give you a huge list  of timezone names .
Now you can use these names to change your timezone

You can change your timezone either by giving timezone offset or timezone regional name.

Its better to use timezone regional names

Here is the query

alter session set time_zone='ASIA/CALCUTTA';