How can I add date with another date in carbon laravel?

问题

In my laravel project, I want to increase the date time with the previous date time.

Here is my code

$expire=$order[0]->expire_date;
$new=Carbon::now()->addMonths(6);

The results of these two lines are

2018-01-28 21:23:56
2018-06-28 21:43:29

What I want to do is sum the both dates.

$expire+$new 

How can I achieve this? Any idea or thought? Thanks.

Edit with more clear view

I want to find the remaining days of the expire date from now and then want to add this remaining date with the new date. Hope it clears.

回答1:

If you want to add six months to order expiration date, just do this:

$new = $order[0]->expire_date->addMonths(6);

This will work since $order[0]->expire_date is a Carbon instance.

If it's not, just parse it first:

$new = Carbon::parse($order[0]->expire_date)->addMonths(6);

回答2:

you can add something like that:

$new=Carbon::createFromTimestamp($order[0]->expire_date->timestamp)->addMonths(6);

来源：https://stackoverflow.com/questions/48014766/how-can-i-add-date-with-another-date-in-carbon-laravel