In todays modern notation of Roman numerals it is: XII-VI-MCMLX
How you write 'my birthday' in Roman numerals depends on the date of your birthday.
It is: XII VIII MMXV in Roman numerals
12 = XII
In todays notation of Roman numerals: XII-XXIII-MCMLXXXVI
XII-XXIII
XXII.XII.MMXI
You could write it as II.I.MCMXCI
XII-VIII-MMX
It is: XII-XXV-MMXI
It is: XII-XV-MMXI
VII-XII-MMX
It is: XII VI MMX