set_userdata() not work

[eluser]Pakm@n[/eluser]
[quote author="InsiteFX" date="1338142175"]If your changing timezones then you may need to set it in index.php like I do for running on localhost!

Code:

/**
* set the default timezone
*/
date_default_timezone_set('America/New_York');

PHP Timezone List

Also make sure that your computer clock is set correct!
[/quote]

Ohh,i see, well, the application is for a client in mexico, he hired the hosting service and i think the server must be in mexico.
the application default time zone is set to mexico city, and my computer clock is set to alaska's timezone (UTC -9:00)
I'll try changing the time on my computer first and then on the application, after that i'll let u know if that worked

thanks so much for your help