Warning: date() [function.date]: It is not safe to rely on the system\'s timezone settings. You are required to use the date.timezone setting or the date
As the warning says...
use the date.timezone setting
Just configure this with your timezone in php.ini, and all will be well for all apps on your server.
EDIT If you are still having this problem after having configured this, you will probably find that your system uses more than one php.ini file. To find out which ini file is used for your web server, use phpinfo().