I have same problem as in this ticket : https://www.8theme.com/topic/sale-countdown-timer-ending-a-day-early-date-interpretation-mismatch-with-woocommerce/#post-471693
When i upload products with sales end date via .csv to woocommerce the count down is one day short.
When i edit a product i dont change any setting just click update the countdown fixes itself but i’m uploading hundreds of products at once i cant just go trough all of them and click update.
im displaying my sale products here: https://kulimary.hu/akcio/villam-akciok/