Magento 2 Tips : Date Format

Copyuse Magento\Framework\Intl\DateTimeFactory;
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$endDate = $this->dateTimeFactory
            ->create($milestone->getData('end_date'), new \DateTimeZone('UTC'))->format('d/m/Y');
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 $collection = $this->collectionFactory->create();
        $gracePeriod = (int)$this->scopeConfig
            ->getValue(self::XML_PATH_GRACE_PERIOD, ScopeInterface::SCOPE_STORE, null);
        $interval = 'P' . $gracePeriod . 'D';
        $date = $this->dateTimeFactory->create('now', new \DateTimeZone('UTC'));
        $archiveDate = $date->sub(new \DateInterval($interval))->format(DateTime::DATETIME_PHP_FORMAT);

        $collection->addFieldToFilter('status', 1)
            ->addFieldToFilter('updated_at', ['lteq' => $archiveDate]);           
            
            
            $endDate = $this->dateTimeFactory
                    ->create(str_replace('/', '-', $row['start_date']), new \DateTimeZone('UTC'))
                    ->format(DateTime::DATETIME_PHP_FORMAT);
            
            $timestamp = DateTime::createFromFormat('!d/m/Y', '23/05/2023')->getTimestamp();
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            /** @var \Magento\Sales\Model\Order $order */
        $order = $this->orderRepository->get(37);
        $orderDate = $order->getCreatedAt();
        $convertedOrderDate = $this->dateTimeFactory
            ->create($orderDate, new \DateTimeZone('UTC'))->format('Y-m-d H:i:s');
        $dueDate = $this->dateTimeFactory
            ->create($orderDate, new \DateTimeZone('UTC'))->add(new \DateInterval('P2D'))->format('Y-m-d H:i:s');
        return ['createdDate' => $orderDate, 'convertedDate' => $convertedOrderDate, 'dueDate' => $dueDate];