<?php
/**
* Вернет кол-во дней между датами
* @param DateTimeImmutable $dateStart дата начала
* @param DateTimeImmutable $dateEnd дата окончания
* @return int
*/
function diffDays(DateTimeImmutable $dateStart, DateTimeImmutable $dateEnd): int {
$dateInterval = date_diff($dateStart, $dateEnd);
return $dateInterval->format("%a") ;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<?php
print(diffDays(new DateTimeImmutable(), new DateTimeImmutable("2025-01-01")));
?>
</body>
</html>