[Solved] do I calculate the percentage of two hours?

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That was the result I was looking for, thanks for your help.

<?php 

date_default_timezone_set('Europe/Istanbul');

$baslangic  = strtotime("2019-11-13 00:10:00");
$bitis      = strtotime("2019-11-13 01:00:00");
$simdi      = time();


if ($simdi < $baslangic) {
    $percentage = 0;
} else if ($simdi > $bitis) {
    $percentage = 100;
}else {
    $percentage = ($baslangic - $simdi) * 100 / ($baslangic - $bitis);
}

echo round($percentage,2);


?>

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solved do I calculate the percentage of two hours?