While hosting Laravel on WHM control panel, you need to make sure to set correct timezone at 4 places:

1. MySql Timezone
MySql time zone is taken from server time which can be update from:

WHM Login > Server Configuration > Server Time

After update the Timezone you need to restart the server.

2. PHP Timezone
This will come from php.ini file. To update php.ini file you need to visit:

WHM Login > MultiPHP Manager > Editor Mode > Choose the PHP Version

Update following variable:

date.timezone = "UTC"

Restart apache and php-fpm service.

3. Laravel Timezone
Update laravel timezone in config/app.php:

...
'timezone' => 'UTC',
...

4. Serialize Datetime
In your Laravel models, use following code:

protected function serializeDate(\DateTimeInterface $date)
{
    return $date->format('Y-m-d H:i:s');
}

You can also create a Base.php model with the above code and extend all your models to Base model.