Data.php

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<?php
namespace Magento\Backend\Helper\Dashboard;

use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\Config\ConfigOptionsListConstants;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $_stores;

    protected $_installDate;

    private $_storeManager;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        DeploymentConfig $deploymentConfig
    ) {
        parent::__construct(
            $context
        );
        $this->_installDate = $deploymentConfig->get(ConfigOptionsListConstants::CONFIG_PATH_INSTALL_DATE);
        $this->_storeManager = $storeManager;
    }

    public function getStores()
    {
        if (!$this->_stores) {
            $this->_stores = $this->_storeManager->getStore()->getResourceCollection()->load();
        }
        return $this->_stores;
    }

    public function countStores()
    {
        return sizeof($this->_stores->getItems());
    }

    public function getDatePeriods()
    {
        return [
            '24h' => __('Last 24 Hours'),
            '7d' => __('Last 7 Days'),
            '1m' => __('Current Month'),
            '1y' => __('YTD'),
            '2y' => __('2YTD')
        ];
    }

    public function getChartDataHash($data)
    {
        $secret = $this->_installDate;
        return md5($data . $secret);
    }
}