Laravel Custom Validation Order

I add a custom Validation Rule

Validator::extend('validate_timezone', function($attribute, $value, $parameters, $validator) {
    $items = request('items');
    $from_date = Carbon::createFromFormat('Y-m-d H:i:s', $item['from_date']);
    // my code below depend on $from_date
    ......
    ......

    return true;
);

validation rule

 "from_date" => "required|date_format:Y-m-d H:i:s|validate_timezone",

the problem , custom validation validate_timezone run before 'date_format:Y-m-d H:i:s' ,so if the format of date is wrong , i will get error inside validate_timezone function

how can i force to validate date_format:Y-m-d H:i:s before the custom validation validate_timezone?

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