Here in the UK we would say “I will visit you on the 19th of September” for example. I have never heard anyone say the month first. It’s just different custom. We also drive on the other side of the road…! At the beginning it would have been helpful if the world would have agreed on a standard either way. Then it would stop confusion. (And less car accidents from people on holiday/vacation on the wrong side of the road! 😅