In today's modern notation of Roman numerals: IX-XXI-MCMLXXXII but the ancient Romans probably wrote them out quite differently.
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September 21, 2013 can be written in Roman numerals as "XXI-IX-MMXIII".
xiii SEPT MCMXCVIII
XI-XXI-MMXI
XXI is the number 21 in Roman numerals.
21 in Roman numerals is XXI. 1 in Roman numerals is I. 90 in Roman numerals is XC. So, 21 1 90 would be XXI I XC in Roman numerals.