Roman numerals are only for numbers, so I assume this is what you want: for 16th: XVI. For October (the eighth month): VIII. For 2012: XVVXII. So all together, it would be: VIII XVI, XVVXII for October 16th, 2012. Hope that was helpful!!!
Improved Answer:-
It is: XVI-X-MMX
The Roman numerals for 16th October 2010 are XVI.X.XMMX.
October 23, 2010, in Roman numerals is written as "XXIII.X.MMIX"
In today's terms it is: October-XIX-MMX or as X-XIX-MMX
October-XXX-MMX
October 10th 2010 can also be written as 10-10-2010 which can be written in Roman numerals as X.X.MMX
X-XV-MMX
October 23, 2010, in Roman numerals is written as "XXIII.X.MMIX"
In today's terms it is: October-XIX-MMX or as X-XIX-MMX
October-XXX-MMX
October 10th 2010 can also be written as 10-10-2010 which can be written in Roman numerals as X.X.MMX
It is: XVIII-X-MMX
X-XV-MMX
It is: X-XVIII-MMX
XXVIII-X-MMX
X-XXXI-MMX
The number 2010 in Roman numerals is MMX
MMX is Roman Numerals for the year 2010.
Expressed in Roman numerals, 2010 is written MMX.2010 = MMX