The earliest release date is listed for a platform even if the release was only in a foreign language or a single country. Each OS currently gets only a single release date entry.
Topic on User talk:RaTcHeT302
I added both release dates mainly because two versions of the game exist for some reason. I didn't know how to leave an empty row in the Windows field thingy.
I don't know the differences between each though, I'll just add the earliest possible date if this happens again.