In letters and most other business writing, dates are indicated by the month, day, and year with a comma separating the figures.
June 15, 2002
The military and most European companies use the day-month-year system with no commas.
5 June 2002
Note: Avoid using slashes with numbers.
In many countries 6/8/03 would mean August 6, 2003.
(From Write for Business, page 212, and Proofreader's Guide PDF, page 14)
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