September 11 (Saturday) in Japan's date notation. That day is typically written as "9/11" in Western countries, but in Japan and some other Asian cultures, the date is often expressed as the month/day combination instead of the year/month combination commonly used in the West.

Here's a rough breakdown:

- In many Western countries, dates are usually written in the format MM/DD (or DD/MM in some) - like 9/11.
- In Japan and some Asian cultures, it's more common to see dates written as MM/DD or simply month followed by day of the week.

So, on September 11th, if you were in a country that uses Western notation, it would be the same date. However, in Japan or other places using MM/DD format, "9/11" is indeed correct and refers to Saturday, September 11th.