Timezone.php

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<?php
namespace Magento\Config\Model\Config\Backend\Locale;

use Magento\Framework\Exception\LocalizedException;

class Timezone extends \Magento\Framework\App\Config\Value
{
    public function beforeSave()
    {
        if (!in_array($this->getValue(), \DateTimeZone::listIdentifiers(\DateTimeZone::ALL))) {
            throw new LocalizedException(__('The time zone is incorrect. Verify the time zone and try again.'));
        }
        return $this;
    }
}