carbon laravel uses tutorial code example

Example 1: add seconds to datetime carbon

Try to parse() it first:
$date = Carbon::parse($dateTime)
            ->addSeconds($seconds)
            ->format('Y-m-d H:i:s');

Example 2: laravel carbon

$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