DateTime i osrzeżenie Strict Standards Opcje

[NeVeS]

Poniższy kod:

Kod

$date = new DateTime();    
$date->setTimezone(new DateTimeZone('Europe/Warsaw'));
$dzisiaj = $date->format("Y-m-d");

generuje poniższe ostrzeżenie:

Strict Standards: DateTime::__construct() [function.DateTime---construct]: 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 'Europe/Paris' for '2.0/DST' instead in E:\htdocs\bc\trunk\lib\Statistic.class.php on line 55

Łaj? jak sie tego pozbyć ;-)?