Mam pytanie czemu przy tym kodzie mam az tyle błedów

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<?php
$d=date('j');
$m=date('n');
$r=date('Y');
$dt=date('w');
$s='<p>Dziś jest ';
switch ($dt) {
case 0: { $s.='niedziela'; break; }
case 1: { $s.='poniedziałek'; break; }
case 2: { $s.='wtorek'; break; }
case 3: { $s.='środa'; break; }
case 4: { $s.='czwartek'; break; }
case 5: { $s.='piątek'; break; }
case 6: { $s.='sobota'; break; }
default: $s='błąd';
}
$s.=", $d ";
switch ($m) {
case 1: { $s.='stycznia'; break; }
case 2: { $s.='lutego'; break; }
case 3: { $s.='marca'; break; }
case 4: { $s.='kwietnia'; break; }
case 5: { $s.='maja'; break; }
case 6: { $s.='czerwca'; break; }
case 7: { $s.='lipca'; break; }
case 8: { $s.='sierpnia'; break; }
case 9: { $s.='września'; break; }
case 10: { $s.='października'; break; }
case 11: { $s.='listopada'; break; }
case 12: { $s.='grudnia'; break; }
default: $s='błąd';
}
$s.=" $r roku.</p>";
echo $s;
?>
[PHP] pobierz, plaintext 

Błedy:
Warning: 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_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 '1.0/no DST' instead in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\... on line 15 Warning: 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_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 '1.0/no DST' instead in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\... on line 16 Warning: 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_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 '1.0/no DST' instead in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\... on line 17 Warning: 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_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 '1.0/no DST' instead in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\... on line 18

Czy przeczytales komuniakt bledu? Bo masz wyraznie napisane o co chodzi. Jesli nie radzisz sobie z angielskim to czy sprobowales najpierw uzyc chocby translate.google.com?