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<?php

$begin = "2018-08-20 11:15:21";
$end = "2018-08-20 21:34:36";

$date1 = new DateTime($begin);
$date2 = new DateTime($end);

$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days ";
echo "<br/>" . $interval->h . " hours, " . $interval->i." minutes, ".$interval->s." seconds";

?>