NewProduct.php

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<?php
namespace Magento\Catalog\Block\Product;

use Magento\Customer\Model\Context as CustomerContext;

class NewProduct extends \Magento\Catalog\Block\Product\AbstractProduct implements
    \Magento\Framework\DataObject\IdentityInterface
{
    const DEFAULT_PRODUCTS_COUNT = 10;

    protected $_productsCount;

    protected $httpContext;

    protected $_catalogProductVisibility;

    protected $_productCollectionFactory;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory,
        \Magento\Catalog\Model\Product\Visibility $catalogProductVisibility,
        \Magento\Framework\App\Http\Context $httpContext,
        array $data = []
    ) {
        $this->_productCollectionFactory = $productCollectionFactory;
        $this->_catalogProductVisibility = $catalogProductVisibility;
        $this->httpContext = $httpContext;
        parent::__construct(
            $context,
            $data
        );
    }

    protected function _construct()
    {
        parent::_construct();
        $this->addColumnCountLayoutDepend('empty', 6)
            ->addColumnCountLayoutDepend('1column', 5)
            ->addColumnCountLayoutDepend('2columns-left', 4)
            ->addColumnCountLayoutDepend('2columns-right', 4)
            ->addColumnCountLayoutDepend('3columns', 3);

        $this->addData(
            ['cache_lifetime' => 86400, 'cache_tags' => [\Magento\Catalog\Model\Product::CACHE_TAG]]
        );
    }

    public function getCacheKeyInfo()
    {
        return [
           'CATALOG_PRODUCT_NEW',
           $this->_storeManager->getStore()->getId(),
           $this->_design->getDesignTheme()->getId(),
           $this->httpContext->getValue(CustomerContext::CONTEXT_GROUP),
           'template' => $this->getTemplate(),
           $this->getProductsCount()
        ];
    }

    protected function _getProductCollection()
    {
        $todayStartOfDayDate = $this->_localeDate->date()->setTime(0, 0, 0)->format('Y-m-d H:i:s');
        $todayEndOfDayDate = $this->_localeDate->date()->setTime(23, 59, 59)->format('Y-m-d H:i:s');

        $collection = $this->_productCollectionFactory->create();
        $collection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());

        $collection = $this->_addProductAttributesAndPrices(
            $collection
        )->addStoreFilter()->addAttributeToFilter(
            'news_from_date',
            [
                'or' => [
                    0 => ['date' => true, 'to' => $todayEndOfDayDate],
                    1 => ['is' => new \Zend_Db_Expr('null')],
                ]
            ],
            'left'
        )->addAttributeToFilter(
            'news_to_date',
            [
                'or' => [
                    0 => ['date' => true, 'from' => $todayStartOfDayDate],
                    1 => ['is' => new \Zend_Db_Expr('null')],
                ]
            ],
            'left'
        )->addAttributeToFilter(
            [
                ['attribute' => 'news_from_date', 'is' => new \Zend_Db_Expr('not null')],
                ['attribute' => 'news_to_date', 'is' => new \Zend_Db_Expr('not null')],
            ]
        )->addAttributeToSort(
            'news_from_date',
            'desc'
        )->setPageSize(
            $this->getProductsCount()
        )->setCurPage(
            1
        );

        return $collection;
    }

    protected function _beforeToHtml()
    {
        $this->setProductCollection($this->_getProductCollection());
        return parent::_beforeToHtml();
    }

    public function setProductsCount($count)
    {
        $this->_productsCount = $count;
        return $this;
    }

    public function getProductsCount()
    {
        if (null === $this->_productsCount) {
            $this->_productsCount = self::DEFAULT_PRODUCTS_COUNT;
        }
        return $this->_productsCount;
    }

    public function getIdentities()
    {
        return [\Magento\Catalog\Model\Product::CACHE_TAG];
    }
}