Laravel UTC DateTime custom cast see tutorials on custom casts https://paulund.co.uk/laravel-custom-casts

UtcDateTime.php

<?php

namespace CustomCast;

use Carbon\Carbon;
use Illuminate\Contracts\Database\Eloquent\CastsAttributes;

class UtcDateTime implements CastsAttributes
{
    /**
     * @param \Illuminate\Database\Eloquent\Model $model
     * @param string $key
     * @param mixed $value
     * @param array $attributes
     *
     * @return Carbon|mixed
     */
    public function get($model, string $key, $value, array $attributes)
    {
        if (is_string($value)) {
            return Carbon::parse($value)->setTimezone(config('app.timezone'));
        }

        return $value->copy()->setTimezone(config('app.timezone'));
    }

    /**
     * @param \Illuminate\Database\Eloquent\Model $model
     * @param string $key
     * @param mixed $value
     * @param array $attributes
     *
     * @return array|Carbon|string
     */
    public function set($model, string $key, $value, array $attributes)
    {
        if (is_string($value)) {
            return Carbon::parse($value)->setTimezone('UTC');
        }
        
        return $value->copy()->setTimezone('UTC');
    }
}