PHP 1

<?php

function checkIfExist($fromTime, $toTime, $input) {

    $fromDateTime = DateTime::createFromFormat("!H:i", $fromTime);
    $toDateTime = DateTime::createFromFormat('!H:i', $toTime);
    $inputDateTime= DateTime::createFromFormat('!H:i', $input);
    if ($fromDateTime> $toDateTime) $toDateTime->modify('+1 day');
    return ($fromDateTime <= $inputDateTime&& $inputDateTime<= $toDateTime) || ($fromDateTime <= $inputDateTime->modify('+1 day') && $inputDateTime<= $toDateTime);
}

$result=checkIfExist("08:00","18:00","09:00");
echo $result; // output 1 - true

?>