August 9th or 9 August

It really doesn't make a difference. "9 August" just sounds a little funny, but people would know what you meant. A better way to say it would be "August 9th" or "the 9th of August"

I've seen "9 August" in many history books and in articles. I don't see why it would be
considered funny.
"August 9" is also widely used.
In both cases, either ordinal or cardinal numbers can be used.

"The 9th of August" is more formal than the above.

9 August is a British construction.

August 9 is American.

For example Americans write September 11 and say "September 11th"
English people write 11 September and say "the 11th of September"

I think you can also say (correctly but awkwardly) September Eleven (Am) or Eleven September (Eng)?

There are definately rules about dates that no one follows. I th

Thank you very much all for all your comments.