MDMLXXXIV
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December 10, 1984 in Roman numerals is X.X.MCMLXXXIV.
The year 1958 is written as MCMLVIII in Roman numerals.
The number (or year) 2009 in Roman numerals is MMIX
In todays notation of Roman numerals: MCMLXXXV
How you write 'my birthday' in Roman numerals depends on the date of your birthday.