Especific Time Zone by user

Hello,

Im trying to set an specific time zone by user. The point is that the specific time_zone is set in a controller

PHP Code:

ini_set('date.timezone', 'America/Santo_Domingo'); 


Even date_default_timezone_set is not working

PHP Code:

date_default_timezone_set('America/Santo_Domingo'); 


If time zone is set in the root index.php file of whole project, everything works fine

Thanks in advance,
Ruben