Laravel Error: Call to a member function format() on string

Posted by I. B. Gd Pramana A. Putra, 02 Apr 23, last updated 02 Apr 23

I had an issue when developing a Laravel 10.x application where I tried to use format() on the deadline_at property.

{{ $project->deadline_at->format('d M Y') }}

It was generating an error "Call to a member function format() on string" as you can see on the attached screenshot.


I have added the following attribute to my Laravel Eloquent Model:

protected $dates = [

So in order to solve this error in Laravel 10.x is to not use the protected $dates, instead use protected casts where we added the property that should be mutated to dates.

* The attributes that should be cast.
* @var array
protected $casts = [
    'deadline_at' => 'datetime',

If your Laravel application version is below 10.x, such as Laravel 9.x, you can still use the protected $dates.

protected $dates = [


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