2013 is MMXIII
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September 21, 2013 can be written in Roman numerals as "XXI-IX-MMXIII".
The equivalent of 2013 in Roman numerals is MMXIII
April 9, 1986 would be written as IX.IV.MCMLXXXVI in Roman numerals.
In Roman numerals the number 77 is written as LXXVII.
2013 = MMXIII