9/11 – For the Sept. 11, 2001, terrorist attacks, 9/11 is acceptable in all references. (Note comma to set off the year when the phrase refers to a month, date and year.)
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AP: For the Sept. 11, 2001, terrorist attacks, 9/11 is acceptable in all references. (Note comma to set off the year when the phrase refers to a month, date and year.)
