date_add（）期望参数1为DateTime，给定字符串

Question

I am trying to fetch the current date and add 7 to it to calculate date of weekly installments for a project. while doing so i encountered a problem:-

date_add() expects parameter 1 to be DateTime, string given

The line causing me this error is

$loan->nextpremiumdate=date_add(date("Y-m-d h:i:sa"),date_interval_create_from_date_string("1 days"));

i am using laravel framework. and nextpremiumdate is column in my loan table.

Answer 1

In your model table declare that you want "nextpremiumdate" to be managed as a date:

public class Loan extends Model {
       protected $dates = [ "nextpremiumdate" ];
}

Then laravel will return the field as a Carbon date and you can just do:

$loan->nextpremiumdate = $loan->nextpremiumdate->addDays(7);

You can refer to the laravel docs or the carbon docs for more details.