SetSpecialPriceStartDate.php

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<?php
namespace Magento\Catalog\Observer;

use Magento\Framework\Event\ObserverInterface;

class SetSpecialPriceStartDate implements ObserverInterface
{
    private $localeDate;

    public function __construct(\Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate)
    {
        $this->localeDate = $localeDate;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();
        if ($product->getSpecialPrice() && !$product->getSpecialFromDate()) {
            $product->setData('special_from_date', $this->localeDate->date());
        }

        return $this;
    }
}