Type the short date code from the battery's label or top. The same code means different months for different makers, so pick the brand. This page runs in your browser and sends nothing anywhere.
Always verify with the maker or the shop. A single year digit repeats every ten years, so the page shows the latest possible date and mentions the one ten years earlier. Round punched stickers on the case are usually inventory dates, not manufacture dates. Part of applianceage.