I assume that's simply IX. Without a 0 prefix.
The date 09-28-1979 in Roman numerals would be IX.XXVIII.MCMLXXIX
The date 03-09-2000 in Roman numerals would be III.IX.MM
The date 9-9-09 in Roman numerals is IX.IX.IX. If the numbers represent the date 09-09-2009 that would be IX.IX.MMIX
XXIIX-IX-IXImproved Answer:-In today's notation of Roman numerals it is: XXVIII-IX-IX
The date 09-08-85 in Roman numerals would be IX.VIII.LXXXV and the full version of the date 09-08-1985 would be IX.VIII.MCMLXXXV
09 or just plain '9' is 'IX'. 1 = I 2 = II 3 = III 4 = IV ( or IIII) 5 = V 6 = VI 7 = VII 8 =VIII 9 = IX 10 = X 11 = XI 12 = XII As found on the dials(faces) of Classical Clocks. NB In Roman Numerals , the highest value letter is ALWAYS to the left. Except when a lower value letter is placed to the left of a higher value letter, then subtract. Hence X = 10 XI = 10 + 1 = 11 IX = 10 - 1 = 9 Similarly for all other letters.
The date 09-28-1979 in Roman numerals would be IX.XXVIII.MCMLXXIX
The date 03-09-2000 in Roman numerals would be III.IX.MM
The date 9-9-09 in Roman numerals is IX.IX.IX. If the numbers represent the date 09-09-2009 that would be IX.IX.MMIX
XXIIX-IX-IXImproved Answer:-In today's notation of Roman numerals it is: XXVIII-IX-IX
The date 09-08-85 in Roman numerals would be IX.VIII.LXXXV and the full version of the date 09-08-1985 would be IX.VIII.MCMLXXXV
I am assuming that you mean the date 09-09-07, in Roman numerals this would be IX.IX.VII and the full version of the date 09-09-2007 would be IX.IX.MMVII
The date 12-09-1988 in Roman numerals would be XII.IX.MCMLXXXVIII
The date 09-27-1988 can be written in Roman numerals as IX.XXVII.MCMLXXXVIII
The date 09-27-1988 can be written in Roman numerals as IX.XXVII.MCMLXXXVIII
The date 09-11-06 can be written in Roman numerals as IX.XI.VI. The full date 09-11-2006 would be IX.XI.MMVI
The date 09-08-1975 in Roman numerals would be IX.VIII.MCMLXXV