We once postulated the question "Does God judge people based on sins they may have committed before knowing they were sins?" For example if you're a headhunter in the jungle, live your life, eat your enemies, kill a man to take his spouse, and die are you held accountable to sins you committed but didn't know existed? The final decision was no, someone unknowingly commiting a sin wouldn't be held accountable. Considering this, it doesn't matter what day the Sabbath is, if you're unknowingly celebrating it wrong you're going to be fine.