$given_time_1 = "02-06-2021 19:19";
$given_time_2 = "10-06-2021 11:10";
$now = date("d-m-Y H:i:s");
echo strtotime($given_time_1);
echo "<br>";
echo strtotime($given_time_2);
echo "<br>";
echo strtotime($now);
echo "<br>";
var_dump($now > $given_time_1); // true
echo "<br>";
var_dump($now > $given_time_2); // false