Add days to date in Laravel

I am beginner in Laravel. I use in my project Laravel 5.8.

I have this code:

$userPromotionDays = $user->premiumDate; // 2019.08.28
$daysToAdd = 5

How can I add $userPromotionDays to $daysToAdd (in Laravel/Carbon)?

Answer

You can create date with custom format and then add days to it using carbon.

$date = Carbon::createFromFormat('Y.m.d', $user->premiumDate);
$daysToAdd = 5;
$date = $date->addDays($daysToAdd);
dd($date);

You can see details documentation here.