Daily views counter

[Lestatt]

I have visit counter for my site

<?php
if((!isset($_COOKIE['cookiename'])) && (!strstr($_SERVER['HTTP_REFERER'], "site"))) {
$plik = fopen("file path", "r");
$tekst = fread($plik, filesize("file path"));
$dane = explode(";", $tekst);
fclose($plik);
$plik = fopen("file path", "w");
flock($plik, 2);
$dane[0]++;
fwrite($plik, "$dane[0];", 15);
flock($plik, 3);
fclose($plik);
setcookie("cookie name", "zliczono", 0);
}
else {
$plik = fopen("file path", "r");
$tekst = fread($plik, filesize("file path"));
$dane = explode(";", $tekst);
}

?>
I wanted to add second or change this one to display daily visits and reset each new day to 0. Can you help me with this one?