Timezone.php

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

class Timezone implements \Magento\Framework\Option\ArrayInterface
{
    protected $ignoredTimezones = [
        'Antarctica/Troll',
        'Asia/Chita',
        'Asia/Srednekolymsk',
        'Pacific/Bougainville'
    ];

    protected $_localeLists;

    public function __construct(\Magento\Framework\Locale\ListsInterface $localeLists)
    {
        $this->_localeLists = $localeLists;
    }

    public function toOptionArray()
    {
        $timezones = $this->_localeLists->getOptionTimezones();
        $timezones = array_filter($timezones, function ($value) {
            if (in_array($value['value'], $this->ignoredTimezones)) {
                return false;
            }
            return true;
        });

        return $timezones;
    }
}