I assume that's simply IX. Without a 0 prefix.
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09 in Roman Numerals is written as IX
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