Page "Calendar date" Paragraph 30

For example, " 9 / 11 " can refer to both the Fall of the Berlin Wall on 9 November 1989 and to September 11 attacks.

In the United States, dates are rarely written in purely numerical forms in formal writing, although they are very common elsewhere ; when numerical forms are used, the month appears first.

In the United Kingdom, while it is regarded as acceptable albeit less common to write month-name day, year, this order is never used when written numerically.

However, as an exception, the American shorthand " 9 / 11 " is widely understood as referring to the 11 September 2001 terrorist attacks.