10th September 1991 would be X. IX. MCMXCI.
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How you write 'my birthday' in Roman numerals depends on the date of your birthday.
The birthday 10-15-1997 is X-XV-MCMXCVII in roman numerals.
The birthday 10 12 1984 in Roman numerals is X.X.MCMLXXXIV.
The birthday of February 24th, 1986 written in roman numerals is: II/XXIV/MCMLXXXVI
XIV.I.MCMLXXI