PHP

carbon add minutes

Carbon::now()->addMinutes($minutes)->timestamp;

add seconds to datetime carbon

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

Convert Carbon Seconds Into Days Hours Minute

CarbonInterval::seconds(90060)->cascade()->forHumans();

“Laravel Convert Carbon Seconds Into Days Hours Minute

CarbonInterval::seconds(90060)->cascade()->forHumans();