Commas are awful, aren't they? Here, 'August 13, 2002' is an adjective modifying 'letter', so we do not want a comma after the year. In 'On August 13, 2002, Jonathan Forbush ran the 3-minute mile', the comma marks the end of the adverbial phrase, and is needed to set it off from the main clause.
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AnonymousThere is supposed to be a comma after the year there. That is the rule. To advise somebody use the European method,13 August 2002, like is done in Europe, so you don't have to mess with commas, is disturbing and lazy. What is this, the politically correct way to punctuate? Let's be like the Europeans -NOT. I hope this person went to another source for help.