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* 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") ;
?>
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<?php
print(diffDays(new DateTimeImmutable(), new DateTimeImmutable("2025-01-01")));