how to set indonesia time zone in php

I want to try set default time zone of indonesia in php language. but not getting success. i am using this php funciton to set default time zone datedefault timezoneset();

this is my code and here i am trying to set default timezine

<?php
date_default_timezone_set("Asia/Indonesia");
?>

if any one know how to do this please help me to set timezone of indonesia

source https://stackoverflow.com/questions/76504412/how-to-set-indonesia-time-zone-in-php