Problema al instalar VB 4.2.2

[B]Warning: date() [[URL="http://www.laguarida.cl/function.date"]function.date[/URL]]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/Chicago' for 'CST/-6.0/no DST' instead in[B]..../includes/functions.php on line [B]4912[/B][/B][/B]

function vb_error_handler($errno, $errstr, $errfile, $errline)
{
    global $vbulletin;

    if (defined('SKIP_ALL_ERRORS'))
    {
        return;
    }

case E_NOTICE:
case E_STRICT:
case E_DEPRECATED:
// Just ignore these completely