carbon diffforhumans

$comment->created_at->diffForHumans();$now = Carbon::now();
echo $now;                               // 2020-03-22 17:45:58
echo "\n";
$today = Carbon::today();
echo $today;                             // 2020-03-22 00:00:00
echo "\n";
$tomorrow = Carbon::tomorrow('Europe/London');
echo $tomorrow;                          // 2020-03-23 00:00:00
echo "\n";
$yesterday = Carbon::yesterday();
echo $yesterday;                         // 2020-03-21 00:00:00\Carbon\Carbon::parse('2019-08-03')->diffForHumans();