//before
$data->created_at; // 2021-12-14 00:00:00
//after
$data->created_at->format('Y-m-d'); //2021-12-14
$data->created_at->format('H:i:s'); //00:00:00

//laravel method 1
{{ $data->created_at->isoFormat('dddd D') }}
//laravel method 2
{!! date('d/M/y', strtotime($data->created_at)) !!}

{{\Carbon\Carbon::createFromFormat('H:i:s',$time)->format('h:i')}}
{{$item->date_seance->format('d/m/Y') }}
{{date('H:i', strtotime($item->start_time)) }} 

// in model
protected $casts = [ 'date_of_approval' => 'date:d-m-Y' ];
// if you want change format any where
$appointment->date_of_approval->format('Y-m-d');
// if you have not cast in model data format
Carbon\Carbon::parse($appointment->date_of_approval)->format('Y-m-d');

date('d-m-Y', strtotime($user->from_date));

now()->addDays()->format('Y-m-d H:i:s') // return '2022-8-22 9:12:13'

{{ $post->created_at->diffForHumans() }} /*	//Output Arya Stuck 14 minutes ago Post something Mizan Khan 23 hours ago Post something */

'date_format:d/m/Y';