I suppose the idea of the comma might be to ensure the numbers don't run together. M arch 25 2014 would be more confusing You can certainly say, March, 25(th), was when it all happened... If you are saying March and then clarifying it as the 25th.
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Anonymous march 25, 2014 why is their not a comma after march?Why would you want to separate "March" and "25" with a comma?