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Time validation always return false. PHP DateTime, Laravel

I'm trying to create a controller for validation for time variable date and time.
The problem is the code can validate the date and check in time correctly but always getting false value for check out time.
Every variable of $checkOut always ended validate as Not Valid, Wrong Check Out Time Format.

$checkOut

Not Valid, Wrong Check Out Time Format

function validateTime($time)
{
$d = DateTime::createFromFormat('H:i:s', $time);
return $d && $d->format('H:i:s') == $time;
}

function validateDate($id, $date, $checkIn, $checkOut)
{
$d = DateTime::createFromFormat('Y-m-d', $date);
$valid = ($d && $d->format('Y-m-d') == $date);
if ($valid == false) {
$data = "Not Valid, Wrong Date Format";
return $data;
} else {
$validCheckIn = $this->validateTime($checkIn);
$validCheckOut = $this->validateTime($checkOut);

if ($validCheckIn == false) {
$data = "Not Valid, Wrong Check In Time Format";
return $data;
}
if ($validCheckOut == false) {
$data = "Not Valid, Wrong Check Out Time Format";
return $data;
}
return $this->setTimezone($id, $date, $checkIn, $checkOut);
}
}


($nip, $tanggal, $masuk, $keluar)

$date

validateDate

string

DateTime

string

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