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Laravel doesn't respect timezone. Cast \Codewiser\Casts\AsDatetimeWithTZ fixes this wrong behaviour.

Before

class Article extends \Illuminate\Database\Eloquent\Model
{
    protected $casts = [
        'date' => 'datetime'
    ];
}

// e.g. Laravel has Europe/London (+01:00) timezone
config()->set('app.timezone', 'Europe/London');

$model = new Article();

$model->date = '2000-01-01T10:00:00+02:00';

echo $model->date->format('c');
// Expecting 2000-01-01T09:00:00+01:00
// Actual    2000-01-01T10:00:00+01:00

After

class Article extends \Illuminate\Database\Eloquent\Model
{
    protected $casts = [
        'date' => \Codewiser\Casts\AsDatetimeWithTZ::class
    ];
}

// e.g. Laravel has Europe/London (+01:00) timezone
config()->set('app.timezone', 'Europe/London');

$model = new Article();

$model->date = '2000-01-01T10:00:00+02:00';

echo $model->date->format('c');
// Expecting 2000-01-01T09:00:00+01:00
// Actual    2000-01-01T09:00:00+01:00